diff options
Diffstat (limited to 'third_party/git/refs.c')
| -rw-r--r-- | third_party/git/refs.c | 2336 |
1 files changed, 0 insertions, 2336 deletions
diff --git a/third_party/git/refs.c b/third_party/git/refs.c deleted file mode 100644 index cd297ee4bd..0000000000 --- a/third_party/git/refs.c +++ /dev/null @@ -1,2336 +0,0 @@ -/* - * The backend-independent part of the reference module. - */ - -#include "cache.h" -#include "config.h" -#include "hashmap.h" -#include "lockfile.h" -#include "iterator.h" -#include "refs.h" -#include "refs/refs-internal.h" -#include "object-store.h" -#include "object.h" -#include "tag.h" -#include "submodule.h" -#include "worktree.h" -#include "argv-array.h" -#include "repository.h" - -/* - * List of all available backends - */ -static struct ref_storage_be *refs_backends = &refs_be_files; - -static struct ref_storage_be *find_ref_storage_backend(const char *name) -{ - struct ref_storage_be *be; - for (be = refs_backends; be; be = be->next) - if (!strcmp(be->name, name)) - return be; - return NULL; -} - -int ref_storage_backend_exists(const char *name) -{ - return find_ref_storage_backend(name) != NULL; -} - -/* - * How to handle various characters in refnames: - * 0: An acceptable character for refs - * 1: End-of-component - * 2: ., look for a preceding . to reject .. in refs - * 3: {, look for a preceding @ to reject @{ in refs - * 4: A bad character: ASCII control characters, and - * ":", "?", "[", "\", "^", "~", SP, or TAB - * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set - */ -static unsigned char refname_disposition[256] = { - 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4 -}; - -/* - * Try to read one refname component from the front of refname. - * Return the length of the component found, or -1 if the component is - * not legal. It is legal if it is something reasonable to have under - * ".git/refs/"; We do not like it if: - * - * - it begins with ".", or - * - it has double dots "..", or - * - it has ASCII control characters, or - * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or - * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or - * - it ends with a "/", or - * - it ends with ".lock", or - * - it contains a "@{" portion - * - * When sanitized is not NULL, instead of rejecting the input refname - * as an error, try to come up with a usable replacement for the input - * refname in it. - */ -static int check_refname_component(const char *refname, int *flags, - struct strbuf *sanitized) -{ - const char *cp; - char last = '\0'; - size_t component_start = 0; /* garbage - not a reasonable initial value */ - - if (sanitized) - component_start = sanitized->len; - - for (cp = refname; ; cp++) { - int ch = *cp & 255; - unsigned char disp = refname_disposition[ch]; - - if (sanitized && disp != 1) - strbuf_addch(sanitized, ch); - - switch (disp) { - case 1: - goto out; - case 2: - if (last == '.') { /* Refname contains "..". */ - if (sanitized) - /* collapse ".." to single "." */ - strbuf_setlen(sanitized, sanitized->len - 1); - else - return -1; - } - break; - case 3: - if (last == '@') { /* Refname contains "@{". */ - if (sanitized) - sanitized->buf[sanitized->len-1] = '-'; - else - return -1; - } - break; - case 4: - /* forbidden char */ - if (sanitized) - sanitized->buf[sanitized->len-1] = '-'; - else - return -1; - break; - case 5: - if (!(*flags & REFNAME_REFSPEC_PATTERN)) { - /* refspec can't be a pattern */ - if (sanitized) - sanitized->buf[sanitized->len-1] = '-'; - else - return -1; - } - - /* - * Unset the pattern flag so that we only accept - * a single asterisk for one side of refspec. - */ - *flags &= ~ REFNAME_REFSPEC_PATTERN; - break; - } - last = ch; - } -out: - if (cp == refname) - return 0; /* Component has zero length. */ - - if (refname[0] == '.') { /* Component starts with '.'. */ - if (sanitized) - sanitized->buf[component_start] = '-'; - else - return -1; - } - if (cp - refname >= LOCK_SUFFIX_LEN && - !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN)) { - if (!sanitized) - return -1; - /* Refname ends with ".lock". */ - while (strbuf_strip_suffix(sanitized, LOCK_SUFFIX)) { - /* try again in case we have .lock.lock */ - } - } - return cp - refname; -} - -static int check_or_sanitize_refname(const char *refname, int flags, - struct strbuf *sanitized) -{ - int component_len, component_count = 0; - - if (!strcmp(refname, "@")) { - /* Refname is a single character '@'. */ - if (sanitized) - strbuf_addch(sanitized, '-'); - else - return -1; - } - - while (1) { - if (sanitized && sanitized->len) - strbuf_complete(sanitized, '/'); - - /* We are at the start of a path component. */ - component_len = check_refname_component(refname, &flags, - sanitized); - if (sanitized && component_len == 0) - ; /* OK, omit empty component */ - else if (component_len <= 0) - return -1; - - component_count++; - if (refname[component_len] == '\0') - break; - /* Skip to next component. */ - refname += component_len + 1; - } - - if (refname[component_len - 1] == '.') { - /* Refname ends with '.'. */ - if (sanitized) - ; /* omit ending dot */ - else - return -1; - } - if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) - return -1; /* Refname has only one component. */ - return 0; -} - -int check_refname_format(const char *refname, int flags) -{ - return check_or_sanitize_refname(refname, flags, NULL); -} - -void sanitize_refname_component(const char *refname, struct strbuf *out) -{ - if (check_or_sanitize_refname(refname, REFNAME_ALLOW_ONELEVEL, out)) - BUG("sanitizing refname '%s' check returned error", refname); -} - -int refname_is_safe(const char *refname) -{ - const char *rest; - - if (skip_prefix(refname, "refs/", &rest)) { - char *buf; - int result; - size_t restlen = strlen(rest); - - /* rest must not be empty, or start or end with "/" */ - if (!restlen || *rest == '/' || rest[restlen - 1] == '/') - return 0; - - /* - * Does the refname try to escape refs/? - * For example: refs/foo/../bar is safe but refs/foo/../../bar - * is not. - */ - buf = xmallocz(restlen); - result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest); - free(buf); - return result; - } - - do { - if (!isupper(*refname) && *refname != '_') - return 0; - refname++; - } while (*refname); - return 1; -} - -/* - * Return true if refname, which has the specified oid and flags, can - * be resolved to an object in the database. If the referred-to object - * does not exist, emit a warning and return false. - */ -int ref_resolves_to_object(const char *refname, - const struct object_id *oid, - unsigned int flags) -{ - if (flags & REF_ISBROKEN) - return 0; - if (!has_object_file(oid)) { - error(_("%s does not point to a valid object!"), refname); - return 0; - } - return 1; -} - -char *refs_resolve_refdup(struct ref_store *refs, - const char *refname, int resolve_flags, - struct object_id *oid, int *flags) -{ - const char *result; - - result = refs_resolve_ref_unsafe(refs, refname, resolve_flags, - oid, flags); - return xstrdup_or_null(result); -} - -char *resolve_refdup(const char *refname, int resolve_flags, - struct object_id *oid, int *flags) -{ - return refs_resolve_refdup(get_main_ref_store(the_repository), - refname, resolve_flags, - oid, flags); -} - -/* The argument to filter_refs */ -struct ref_filter { - const char *pattern; - const char *prefix; - each_ref_fn *fn; - void *cb_data; -}; - -int refs_read_ref_full(struct ref_store *refs, const char *refname, - int resolve_flags, struct object_id *oid, int *flags) -{ - if (refs_resolve_ref_unsafe(refs, refname, resolve_flags, oid, flags)) - return 0; - return -1; -} - -int read_ref_full(const char *refname, int resolve_flags, struct object_id *oid, int *flags) -{ - return refs_read_ref_full(get_main_ref_store(the_repository), refname, - resolve_flags, oid, flags); -} - -int read_ref(const char *refname, struct object_id *oid) -{ - return read_ref_full(refname, RESOLVE_REF_READING, oid, NULL); -} - -static int refs_ref_exists(struct ref_store *refs, const char *refname) -{ - return !!refs_resolve_ref_unsafe(refs, refname, RESOLVE_REF_READING, NULL, NULL); -} - -int ref_exists(const char *refname) -{ - return refs_ref_exists(get_main_ref_store(the_repository), refname); -} - -static int match_ref_pattern(const char *refname, - const struct string_list_item *item) -{ - int matched = 0; - if (item->util == NULL) { - if (!wildmatch(item->string, refname, 0)) - matched = 1; - } else { - const char *rest; - if (skip_prefix(refname, item->string, &rest) && - (!*rest || *rest == '/')) - matched = 1; - } - return matched; -} - -int ref_filter_match(const char *refname, - const struct string_list *include_patterns, - const struct string_list *exclude_patterns) -{ - struct string_list_item *item; - - if (exclude_patterns && exclude_patterns->nr) { - for_each_string_list_item(item, exclude_patterns) { - if (match_ref_pattern(refname, item)) - return 0; - } - } - - if (include_patterns && include_patterns->nr) { - int found = 0; - for_each_string_list_item(item, include_patterns) { - if (match_ref_pattern(refname, item)) { - found = 1; - break; - } - } - - if (!found) - return 0; - } - return 1; -} - -static int filter_refs(const char *refname, const struct object_id *oid, - int flags, void *data) -{ - struct ref_filter *filter = (struct ref_filter *)data; - - if (wildmatch(filter->pattern, refname, 0)) - return 0; - if (filter->prefix) - skip_prefix(refname, filter->prefix, &refname); - return filter->fn(refname, oid, flags, filter->cb_data); -} - -enum peel_status peel_object(const struct object_id *name, struct object_id *oid) -{ - struct object *o = lookup_unknown_object(name); - - if (o->type == OBJ_NONE) { - int type = oid_object_info(the_repository, name, NULL); - if (type < 0 || !object_as_type(the_repository, o, type, 0)) - return PEEL_INVALID; - } - - if (o->type != OBJ_TAG) - return PEEL_NON_TAG; - - o = deref_tag_noverify(o); - if (!o) - return PEEL_INVALID; - - oidcpy(oid, &o->oid); - return PEEL_PEELED; -} - -struct warn_if_dangling_data { - FILE *fp; - const char *refname; - const struct string_list *refnames; - const char *msg_fmt; -}; - -static int warn_if_dangling_symref(const char *refname, const struct object_id *oid, - int flags, void *cb_data) -{ - struct warn_if_dangling_data *d = cb_data; - const char *resolves_to; - - if (!(flags & REF_ISSYMREF)) - return 0; - - resolves_to = resolve_ref_unsafe(refname, 0, NULL, NULL); - if (!resolves_to - || (d->refname - ? strcmp(resolves_to, d->refname) - : !string_list_has_string(d->refnames, resolves_to))) { - return 0; - } - - fprintf(d->fp, d->msg_fmt, refname); - fputc('\n', d->fp); - return 0; -} - -void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) -{ - struct warn_if_dangling_data data; - - data.fp = fp; - data.refname = refname; - data.refnames = NULL; - data.msg_fmt = msg_fmt; - for_each_rawref(warn_if_dangling_symref, &data); -} - -void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames) -{ - struct warn_if_dangling_data data; - - data.fp = fp; - data.refname = NULL; - data.refnames = refnames; - data.msg_fmt = msg_fmt; - for_each_rawref(warn_if_dangling_symref, &data); -} - -int refs_for_each_tag_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - return refs_for_each_ref_in(refs, "refs/tags/", fn, cb_data); -} - -int for_each_tag_ref(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_tag_ref(get_main_ref_store(the_repository), fn, cb_data); -} - -int refs_for_each_branch_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - return refs_for_each_ref_in(refs, "refs/heads/", fn, cb_data); -} - -int for_each_branch_ref(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_branch_ref(get_main_ref_store(the_repository), fn, cb_data); -} - -int refs_for_each_remote_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - return refs_for_each_ref_in(refs, "refs/remotes/", fn, cb_data); -} - -int for_each_remote_ref(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_remote_ref(get_main_ref_store(the_repository), fn, cb_data); -} - -int head_ref_namespaced(each_ref_fn fn, void *cb_data) -{ - struct strbuf buf = STRBUF_INIT; - int ret = 0; - struct object_id oid; - int flag; - - strbuf_addf(&buf, "%sHEAD", get_git_namespace()); - if (!read_ref_full(buf.buf, RESOLVE_REF_READING, &oid, &flag)) - ret = fn(buf.buf, &oid, flag, cb_data); - strbuf_release(&buf); - - return ret; -} - -void normalize_glob_ref(struct string_list_item *item, const char *prefix, - const char *pattern) -{ - struct strbuf normalized_pattern = STRBUF_INIT; - - if (*pattern == '/') - BUG("pattern must not start with '/'"); - - if (prefix) { - strbuf_addstr(&normalized_pattern, prefix); - } - else if (!starts_with(pattern, "refs/")) - strbuf_addstr(&normalized_pattern, "refs/"); - strbuf_addstr(&normalized_pattern, pattern); - strbuf_strip_suffix(&normalized_pattern, "/"); - - item->string = strbuf_detach(&normalized_pattern, NULL); - item->util = has_glob_specials(pattern) ? NULL : item->string; - strbuf_release(&normalized_pattern); -} - -int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, - const char *prefix, void *cb_data) -{ - struct strbuf real_pattern = STRBUF_INIT; - struct ref_filter filter; - int ret; - - if (!prefix && !starts_with(pattern, "refs/")) - strbuf_addstr(&real_pattern, "refs/"); - else if (prefix) - strbuf_addstr(&real_pattern, prefix); - strbuf_addstr(&real_pattern, pattern); - - if (!has_glob_specials(pattern)) { - /* Append implied '/' '*' if not present. */ - strbuf_complete(&real_pattern, '/'); - /* No need to check for '*', there is none. */ - strbuf_addch(&real_pattern, '*'); - } - - filter.pattern = real_pattern.buf; - filter.prefix = prefix; - filter.fn = fn; - filter.cb_data = cb_data; - ret = for_each_ref(filter_refs, &filter); - - strbuf_release(&real_pattern); - return ret; -} - -int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) -{ - return for_each_glob_ref_in(fn, pattern, NULL, cb_data); -} - -const char *prettify_refname(const char *name) -{ - if (skip_prefix(name, "refs/heads/", &name) || - skip_prefix(name, "refs/tags/", &name) || - skip_prefix(name, "refs/remotes/", &name)) - ; /* nothing */ - return name; -} - -static const char *ref_rev_parse_rules[] = { - "%.*s", - "refs/%.*s", - "refs/tags/%.*s", - "refs/heads/%.*s", - "refs/remotes/%.*s", - "refs/remotes/%.*s/HEAD", - NULL -}; - -#define NUM_REV_PARSE_RULES (ARRAY_SIZE(ref_rev_parse_rules) - 1) - -/* - * Is it possible that the caller meant full_name with abbrev_name? - * If so return a non-zero value to signal "yes"; the magnitude of - * the returned value gives the precedence used for disambiguation. - * - * If abbrev_name cannot mean full_name, return 0. - */ -int refname_match(const char *abbrev_name, const char *full_name) -{ - const char **p; - const int abbrev_name_len = strlen(abbrev_name); - const int num_rules = NUM_REV_PARSE_RULES; - - for (p = ref_rev_parse_rules; *p; p++) - if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) - return &ref_rev_parse_rules[num_rules] - p; - - return 0; -} - -/* - * Given a 'prefix' expand it by the rules in 'ref_rev_parse_rules' and add - * the results to 'prefixes' - */ -void expand_ref_prefix(struct argv_array *prefixes, const char *prefix) -{ - const char **p; - int len = strlen(prefix); - - for (p = ref_rev_parse_rules; *p; p++) - argv_array_pushf(prefixes, *p, len, prefix); -} - -/* - * *string and *len will only be substituted, and *string returned (for - * later free()ing) if the string passed in is a magic short-hand form - * to name a branch. - */ -static char *substitute_branch_name(struct repository *r, - const char **string, int *len) -{ - struct strbuf buf = STRBUF_INIT; - int ret = repo_interpret_branch_name(r, *string, *len, &buf, 0); - - if (ret == *len) { - size_t size; - *string = strbuf_detach(&buf, &size); - *len = size; - return (char *)*string; - } - - return NULL; -} - -int repo_dwim_ref(struct repository *r, const char *str, int len, - struct object_id *oid, char **ref) -{ - char *last_branch = substitute_branch_name(r, &str, &len); - int refs_found = expand_ref(r, str, len, oid, ref); - free(last_branch); - return refs_found; -} - -int dwim_ref(const char *str, int len, struct object_id *oid, char **ref) -{ - return repo_dwim_ref(the_repository, str, len, oid, ref); -} - -int expand_ref(struct repository *repo, const char *str, int len, - struct object_id *oid, char **ref) -{ - const char **p, *r; - int refs_found = 0; - struct strbuf fullref = STRBUF_INIT; - - *ref = NULL; - for (p = ref_rev_parse_rules; *p; p++) { - struct object_id oid_from_ref; - struct object_id *this_result; - int flag; - - this_result = refs_found ? &oid_from_ref : oid; - strbuf_reset(&fullref); - strbuf_addf(&fullref, *p, len, str); - r = refs_resolve_ref_unsafe(get_main_ref_store(repo), - fullref.buf, RESOLVE_REF_READING, - this_result, &flag); - if (r) { - if (!refs_found++) - *ref = xstrdup(r); - if (!warn_ambiguous_refs) - break; - } else if ((flag & REF_ISSYMREF) && strcmp(fullref.buf, "HEAD")) { - warning(_("ignoring dangling symref %s"), fullref.buf); - } else if ((flag & REF_ISBROKEN) && strchr(fullref.buf, '/')) { - warning(_("ignoring broken ref %s"), fullref.buf); - } - } - strbuf_release(&fullref); - return refs_found; -} - -int repo_dwim_log(struct repository *r, const char *str, int len, - struct object_id *oid, char **log) -{ - struct ref_store *refs = get_main_ref_store(r); - char *last_branch = substitute_branch_name(r, &str, &len); - const char **p; - int logs_found = 0; - struct strbuf path = STRBUF_INIT; - - *log = NULL; - for (p = ref_rev_parse_rules; *p; p++) { - struct object_id hash; - const char *ref, *it; - - strbuf_reset(&path); - strbuf_addf(&path, *p, len, str); - ref = refs_resolve_ref_unsafe(refs, path.buf, - RESOLVE_REF_READING, - &hash, NULL); - if (!ref) - continue; - if (refs_reflog_exists(refs, path.buf)) - it = path.buf; - else if (strcmp(ref, path.buf) && - refs_reflog_exists(refs, ref)) - it = ref; - else - continue; - if (!logs_found++) { - *log = xstrdup(it); - oidcpy(oid, &hash); - } - if (!warn_ambiguous_refs) - break; - } - strbuf_release(&path); - free(last_branch); - return logs_found; -} - -int dwim_log(const char *str, int len, struct object_id *oid, char **log) -{ - return repo_dwim_log(the_repository, str, len, oid, log); -} - -static int is_per_worktree_ref(const char *refname) -{ - return !strcmp(refname, "HEAD") || - starts_with(refname, "refs/worktree/") || - starts_with(refname, "refs/bisect/") || - starts_with(refname, "refs/rewritten/"); -} - -static int is_pseudoref_syntax(const char *refname) -{ - const char *c; - - for (c = refname; *c; c++) { - if (!isupper(*c) && *c != '-' && *c != '_') - return 0; - } - - return 1; -} - -static int is_main_pseudoref_syntax(const char *refname) -{ - return skip_prefix(refname, "main-worktree/", &refname) && - *refname && - is_pseudoref_syntax(refname); -} - -static int is_other_pseudoref_syntax(const char *refname) -{ - if (!skip_prefix(refname, "worktrees/", &refname)) - return 0; - refname = strchr(refname, '/'); - if (!refname || !refname[1]) - return 0; - return is_pseudoref_syntax(refname + 1); -} - -enum ref_type ref_type(const char *refname) -{ - if (is_per_worktree_ref(refname)) - return REF_TYPE_PER_WORKTREE; - if (is_pseudoref_syntax(refname)) - return REF_TYPE_PSEUDOREF; - if (is_main_pseudoref_syntax(refname)) - return REF_TYPE_MAIN_PSEUDOREF; - if (is_other_pseudoref_syntax(refname)) - return REF_TYPE_OTHER_PSEUDOREF; - return REF_TYPE_NORMAL; -} - -long get_files_ref_lock_timeout_ms(void) -{ - static int configured = 0; - - /* The default timeout is 100 ms: */ - static int timeout_ms = 100; - - if (!configured) { - git_config_get_int("core.filesreflocktimeout", &timeout_ms); - configured = 1; - } - - return timeout_ms; -} - -static int write_pseudoref(const char *pseudoref, const struct object_id *oid, - const struct object_id *old_oid, struct strbuf *err) -{ - const char *filename; - int fd; - struct lock_file lock = LOCK_INIT; - struct strbuf buf = STRBUF_INIT; - int ret = -1; - - if (!oid) - return 0; - - strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); - - filename = git_path("%s", pseudoref); - fd = hold_lock_file_for_update_timeout(&lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - strbuf_addf(err, _("could not open '%s' for writing: %s"), - filename, strerror(errno)); - goto done; - } - - if (old_oid) { - struct object_id actual_old_oid; - - if (read_ref(pseudoref, &actual_old_oid)) { - if (!is_null_oid(old_oid)) { - strbuf_addf(err, _("could not read ref '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } else if (is_null_oid(old_oid)) { - strbuf_addf(err, _("ref '%s' already exists"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } else if (!oideq(&actual_old_oid, old_oid)) { - strbuf_addf(err, _("unexpected object ID when writing '%s'"), - pseudoref); - rollback_lock_file(&lock); - goto done; - } - } - - if (write_in_full(fd, buf.buf, buf.len) < 0) { - strbuf_addf(err, _("could not write to '%s'"), filename); - rollback_lock_file(&lock); - goto done; - } - - commit_lock_file(&lock); - ret = 0; -done: - strbuf_release(&buf); - return ret; -} - -static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid) -{ - const char *filename; - - filename = git_path("%s", pseudoref); - - if (old_oid && !is_null_oid(old_oid)) { - struct lock_file lock = LOCK_INIT; - int fd; - struct object_id actual_old_oid; - - fd = hold_lock_file_for_update_timeout( - &lock, filename, 0, - get_files_ref_lock_timeout_ms()); - if (fd < 0) { - error_errno(_("could not open '%s' for writing"), - filename); - return -1; - } - if (read_ref(pseudoref, &actual_old_oid)) - die(_("could not read ref '%s'"), pseudoref); - if (!oideq(&actual_old_oid, old_oid)) { - error(_("unexpected object ID when deleting '%s'"), - pseudoref); - rollback_lock_file(&lock); - return -1; - } - - unlink(filename); - rollback_lock_file(&lock); - } else { - unlink(filename); - } - - return 0; -} - -int refs_delete_ref(struct ref_store *refs, const char *msg, - const char *refname, - const struct object_id *old_oid, - unsigned int flags) -{ - struct ref_transaction *transaction; - struct strbuf err = STRBUF_INIT; - - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - return delete_pseudoref(refname, old_oid); - } - - transaction = ref_store_transaction_begin(refs, &err); - if (!transaction || - ref_transaction_delete(transaction, refname, old_oid, - flags, msg, &err) || - ref_transaction_commit(transaction, &err)) { - error("%s", err.buf); - ref_transaction_free(transaction); - strbuf_release(&err); - return 1; - } - ref_transaction_free(transaction); - strbuf_release(&err); - return 0; -} - -int delete_ref(const char *msg, const char *refname, - const struct object_id *old_oid, unsigned int flags) -{ - return refs_delete_ref(get_main_ref_store(the_repository), msg, refname, - old_oid, flags); -} - -void copy_reflog_msg(struct strbuf *sb, const char *msg) -{ - char c; - int wasspace = 1; - - strbuf_addch(sb, '\t'); - while ((c = *msg++)) { - if (wasspace && isspace(c)) - continue; - wasspace = isspace(c); - if (wasspace) - c = ' '; - strbuf_addch(sb, c); - } - strbuf_rtrim(sb); -} - -int should_autocreate_reflog(const char *refname) -{ - switch (log_all_ref_updates) { - case LOG_REFS_ALWAYS: - return 1; - case LOG_REFS_NORMAL: - return starts_with(refname, "refs/heads/") || - starts_with(refname, "refs/remotes/") || - starts_with(refname, "refs/notes/") || - !strcmp(refname, "HEAD"); - default: - return 0; - } -} - -int is_branch(const char *refname) -{ - return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); -} - -struct read_ref_at_cb { - const char *refname; - timestamp_t at_time; - int cnt; - int reccnt; - struct object_id *oid; - int found_it; - - struct object_id ooid; - struct object_id noid; - int tz; - timestamp_t date; - char **msg; - timestamp_t *cutoff_time; - int *cutoff_tz; - int *cutoff_cnt; -}; - -static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid, - const char *email, timestamp_t timestamp, int tz, - const char *message, void *cb_data) -{ - struct read_ref_at_cb *cb = cb_data; - - cb->reccnt++; - cb->tz = tz; - cb->date = timestamp; - - if (timestamp <= cb->at_time || cb->cnt == 0) { - if (cb->msg) - *cb->msg = xstrdup(message); - if (cb->cutoff_time) - *cb->cutoff_time = timestamp; - if (cb->cutoff_tz) - *cb->cutoff_tz = tz; - if (cb->cutoff_cnt) - *cb->cutoff_cnt = cb->reccnt - 1; - /* - * we have not yet updated cb->[n|o]oid so they still - * hold the values for the previous record. - */ - if (!is_null_oid(&cb->ooid)) { - oidcpy(cb->oid, noid); - if (!oideq(&cb->ooid, noid)) - warning(_("log for ref %s has gap after %s"), - cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822))); - } - else if (cb->date == cb->at_time) - oidcpy(cb->oid, noid); - else if (!oideq(noid, cb->oid)) - warning(_("log for ref %s unexpectedly ended on %s"), - cb->refname, show_date(cb->date, cb->tz, - DATE_MODE(RFC2822))); - oidcpy(&cb->ooid, ooid); - oidcpy(&cb->noid, noid); - cb->found_it = 1; - return 1; - } - oidcpy(&cb->ooid, ooid); - oidcpy(&cb->noid, noid); - if (cb->cnt > 0) - cb->cnt--; - return 0; -} - -static int read_ref_at_ent_oldest(struct object_id *ooid, struct object_id *noid, - const char *email, timestamp_t timestamp, - int tz, const char *message, void *cb_data) -{ - struct read_ref_at_cb *cb = cb_data; - - if (cb->msg) - *cb->msg = xstrdup(message); - if (cb->cutoff_time) - *cb->cutoff_time = timestamp; - if (cb->cutoff_tz) - *cb->cutoff_tz = tz; - if (cb->cutoff_cnt) - *cb->cutoff_cnt = cb->reccnt; - oidcpy(cb->oid, ooid); - if (is_null_oid(cb->oid)) - oidcpy(cb->oid, noid); - /* We just want the first entry */ - return 1; -} - -int read_ref_at(struct ref_store *refs, const char *refname, - unsigned int flags, timestamp_t at_time, int cnt, - struct object_id *oid, char **msg, - timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt) -{ - struct read_ref_at_cb cb; - - memset(&cb, 0, sizeof(cb)); - cb.refname = refname; - cb.at_time = at_time; - cb.cnt = cnt; - cb.msg = msg; - cb.cutoff_time = cutoff_time; - cb.cutoff_tz = cutoff_tz; - cb.cutoff_cnt = cutoff_cnt; - cb.oid = oid; - - refs_for_each_reflog_ent_reverse(refs, refname, read_ref_at_ent, &cb); - - if (!cb.reccnt) { - if (flags & GET_OID_QUIETLY) - exit(128); - else - die(_("log for %s is empty"), refname); - } - if (cb.found_it) - return 0; - - refs_for_each_reflog_ent(refs, refname, read_ref_at_ent_oldest, &cb); - - return 1; -} - -struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs, - struct strbuf *err) -{ - struct ref_transaction *tr; - assert(err); - - tr = xcalloc(1, sizeof(struct ref_transaction)); - tr->ref_store = refs; - return tr; -} - -struct ref_transaction *ref_transaction_begin(struct strbuf *err) -{ - return ref_store_transaction_begin(get_main_ref_store(the_repository), err); -} - -void ref_transaction_free(struct ref_transaction *transaction) -{ - size_t i; - - if (!transaction) - return; - - switch (transaction->state) { - case REF_TRANSACTION_OPEN: - case REF_TRANSACTION_CLOSED: - /* OK */ - break; - case REF_TRANSACTION_PREPARED: - BUG("free called on a prepared reference transaction"); - break; - default: - BUG("unexpected reference transaction state"); - break; - } - - for (i = 0; i < transaction->nr; i++) { - free(transaction->updates[i]->msg); - free(transaction->updates[i]); - } - free(transaction->updates); - free(transaction); -} - -struct ref_update *ref_transaction_add_update( - struct ref_transaction *transaction, - const char *refname, unsigned int flags, - const struct object_id *new_oid, - const struct object_id *old_oid, - const char *msg) -{ - struct ref_update *update; - - if (transaction->state != REF_TRANSACTION_OPEN) - BUG("update called for transaction that is not open"); - - FLEX_ALLOC_STR(update, refname, refname); - ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc); - transaction->updates[transaction->nr++] = update; - - update->flags = flags; - - if (flags & REF_HAVE_NEW) - oidcpy(&update->new_oid, new_oid); - if (flags & REF_HAVE_OLD) - oidcpy(&update->old_oid, old_oid); - update->msg = xstrdup_or_null(msg); - return update; -} - -int ref_transaction_update(struct ref_transaction *transaction, - const char *refname, - const struct object_id *new_oid, - const struct object_id *old_oid, - unsigned int flags, const char *msg, - struct strbuf *err) -{ - assert(err); - - if ((new_oid && !is_null_oid(new_oid)) ? - check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) : - !refname_is_safe(refname)) { - strbuf_addf(err, _("refusing to update ref with bad name '%s'"), - refname); - return -1; - } - - if (flags & ~REF_TRANSACTION_UPDATE_ALLOWED_FLAGS) - BUG("illegal flags 0x%x passed to ref_transaction_update()", flags); - - flags |= (new_oid ? REF_HAVE_NEW : 0) | (old_oid ? REF_HAVE_OLD : 0); - - ref_transaction_add_update(transaction, refname, flags, - new_oid, old_oid, msg); - return 0; -} - -int ref_transaction_create(struct ref_transaction *transaction, - const char *refname, - const struct object_id *new_oid, - unsigned int flags, const char *msg, - struct strbuf *err) -{ - if (!new_oid || is_null_oid(new_oid)) - BUG("create called without valid new_oid"); - return ref_transaction_update(transaction, refname, new_oid, - &null_oid, flags, msg, err); -} - -int ref_transaction_delete(struct ref_transaction *transaction, - const char *refname, - const struct object_id *old_oid, - unsigned int flags, const char *msg, - struct strbuf *err) -{ - if (old_oid && is_null_oid(old_oid)) - BUG("delete called with old_oid set to zeros"); - return ref_transaction_update(transaction, refname, - &null_oid, old_oid, - flags, msg, err); -} - -int ref_transaction_verify(struct ref_transaction *transaction, - const char *refname, - const struct object_id *old_oid, - unsigned int flags, - struct strbuf *err) -{ - if (!old_oid) - BUG("verify called with old_oid set to NULL"); - return ref_transaction_update(transaction, refname, - NULL, old_oid, - flags, NULL, err); -} - -int refs_update_ref(struct ref_store *refs, const char *msg, - const char *refname, const struct object_id *new_oid, - const struct object_id *old_oid, unsigned int flags, - enum action_on_err onerr) -{ - struct ref_transaction *t = NULL; - struct strbuf err = STRBUF_INIT; - int ret = 0; - - if (ref_type(refname) == REF_TYPE_PSEUDOREF) { - assert(refs == get_main_ref_store(the_repository)); - ret = write_pseudoref(refname, new_oid, old_oid, &err); - } else { - t = ref_store_transaction_begin(refs, &err); - if (!t || - ref_transaction_update(t, refname, new_oid, old_oid, - flags, msg, &err) || - ref_transaction_commit(t, &err)) { - ret = 1; - ref_transaction_free(t); - } - } - if (ret) { - const char *str = _("update_ref failed for ref '%s': %s"); - - switch (onerr) { - case UPDATE_REFS_MSG_ON_ERR: - error(str, refname, err.buf); - break; - case UPDATE_REFS_DIE_ON_ERR: - die(str, refname, err.buf); - break; - case UPDATE_REFS_QUIET_ON_ERR: - break; - } - strbuf_release(&err); - return 1; - } - strbuf_release(&err); - if (t) - ref_transaction_free(t); - return 0; -} - -int update_ref(const char *msg, const char *refname, - const struct object_id *new_oid, - const struct object_id *old_oid, - unsigned int flags, enum action_on_err onerr) -{ - return refs_update_ref(get_main_ref_store(the_repository), msg, refname, new_oid, - old_oid, flags, onerr); -} - -char *refs_shorten_unambiguous_ref(struct ref_store *refs, - const char *refname, int strict) -{ - int i; - static char **scanf_fmts; - static int nr_rules; - char *short_name; - struct strbuf resolved_buf = STRBUF_INIT; - - if (!nr_rules) { - /* - * Pre-generate scanf formats from ref_rev_parse_rules[]. - * Generate a format suitable for scanf from a - * ref_rev_parse_rules rule by interpolating "%s" at the - * location of the "%.*s". - */ - size_t total_len = 0; - size_t offset = 0; - - /* the rule list is NULL terminated, count them first */ - for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) - /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ - total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; - - scanf_fmts = xmalloc(st_add(st_mult(sizeof(char *), nr_rules), total_len)); - - offset = 0; - for (i = 0; i < nr_rules; i++) { - assert(offset < total_len); - scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset; - offset += xsnprintf(scanf_fmts[i], total_len - offset, - ref_rev_parse_rules[i], 2, "%s") + 1; - } - } - - /* bail out if there are no rules */ - if (!nr_rules) - return xstrdup(refname); - - /* buffer for scanf result, at most refname must fit */ - short_name = xstrdup(refname); - - /* skip first rule, it will always match */ - for (i = nr_rules - 1; i > 0 ; --i) { - int j; - int rules_to_fail = i; - int short_name_len; - - if (1 != sscanf(refname, scanf_fmts[i], short_name)) - continue; - - short_name_len = strlen(short_name); - - /* - * in strict mode, all (except the matched one) rules - * must fail to resolve to a valid non-ambiguous ref - */ - if (strict) - rules_to_fail = nr_rules; - - /* - * check if the short name resolves to a valid ref, - * but use only rules prior to the matched one - */ - for (j = 0; j < rules_to_fail; j++) { - const char *rule = ref_rev_parse_rules[j]; - - /* skip matched rule */ - if (i == j) - continue; - - /* - * the short name is ambiguous, if it resolves - * (with this previous rule) to a valid ref - * read_ref() returns 0 on success - */ - strbuf_reset(&resolved_buf); - strbuf_addf(&resolved_buf, rule, - short_name_len, short_name); - if (refs_ref_exists(refs, resolved_buf.buf)) - break; - } - - /* - * short name is non-ambiguous if all previous rules - * haven't resolved to a valid ref - */ - if (j == rules_to_fail) { - strbuf_release(&resolved_buf); - return short_name; - } - } - - strbuf_release(&resolved_buf); - free(short_name); - return xstrdup(refname); -} - -char *shorten_unambiguous_ref(const char *refname, int strict) -{ - return refs_shorten_unambiguous_ref(get_main_ref_store(the_repository), - refname, strict); -} - -static struct string_list *hide_refs; - -int parse_hide_refs_config(const char *var, const char *value, const char *section) -{ - const char *key; - if (!strcmp("transfer.hiderefs", var) || - (!parse_config_key(var, section, NULL, NULL, &key) && - !strcmp(key, "hiderefs"))) { - char *ref; - int len; - - if (!value) - return config_error_nonbool(var); - ref = xstrdup(value); - len = strlen(ref); - while (len && ref[len - 1] == '/') - ref[--len] = '\0'; - if (!hide_refs) { - hide_refs = xcalloc(1, sizeof(*hide_refs)); - hide_refs->strdup_strings = 1; - } - string_list_append(hide_refs, ref); - } - return 0; -} - -int ref_is_hidden(const char *refname, const char *refname_full) -{ - int i; - - if (!hide_refs) - return 0; - for (i = hide_refs->nr - 1; i >= 0; i--) { - const char *match = hide_refs->items[i].string; - const char *subject; - int neg = 0; - const char *p; - - if (*match == '!') { - neg = 1; - match++; - } - - if (*match == '^') { - subject = refname_full; - match++; - } else { - subject = refname; - } - - /* refname can be NULL when namespaces are used. */ - if (subject && - skip_prefix(subject, match, &p) && - (!*p || *p == '/')) - return !neg; - } - return 0; -} - -const char *find_descendant_ref(const char *dirname, - const struct string_list *extras, - const struct string_list *skip) -{ - int pos; - - if (!extras) - return NULL; - - /* - * Look at the place where dirname would be inserted into - * extras. If there is an entry at that position that starts - * with dirname (remember, dirname includes the trailing - * slash) and is not in skip, then we have a conflict. - */ - for (pos = string_list_find_insert_index(extras, dirname, 0); - pos < extras->nr; pos++) { - const char *extra_refname = extras->items[pos].string; - - if (!starts_with(extra_refname, dirname)) - break; - - if (!skip || !string_list_has_string(skip, extra_refname)) - return extra_refname; - } - return NULL; -} - -int refs_rename_ref_available(struct ref_store *refs, - const char *old_refname, - const char *new_refname) -{ - struct string_list skip = STRING_LIST_INIT_NODUP; - struct strbuf err = STRBUF_INIT; - int ok; - - string_list_insert(&skip, old_refname); - ok = !refs_verify_refname_available(refs, new_refname, - NULL, &skip, &err); - if (!ok) - error("%s", err.buf); - - string_list_clear(&skip, 0); - strbuf_release(&err); - return ok; -} - -int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - struct object_id oid; - int flag; - - if (!refs_read_ref_full(refs, "HEAD", RESOLVE_REF_READING, - &oid, &flag)) - return fn("HEAD", &oid, flag, cb_data); - - return 0; -} - -int head_ref(each_ref_fn fn, void *cb_data) -{ - return refs_head_ref(get_main_ref_store(the_repository), fn, cb_data); -} - -struct ref_iterator *refs_ref_iterator_begin( - struct ref_store *refs, - const char *prefix, int trim, int flags) -{ - struct ref_iterator *iter; - - if (ref_paranoia < 0) - ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0); - if (ref_paranoia) - flags |= DO_FOR_EACH_INCLUDE_BROKEN; - - iter = refs->be->iterator_begin(refs, prefix, flags); - - /* - * `iterator_begin()` already takes care of prefix, but we - * might need to do some trimming: - */ - if (trim) - iter = prefix_ref_iterator_begin(iter, "", trim); - - /* Sanity check for subclasses: */ - if (!iter->ordered) - BUG("reference iterator is not ordered"); - - return iter; -} - -/* - * Call fn for each reference in the specified submodule for which the - * refname begins with prefix. If trim is non-zero, then trim that - * many characters off the beginning of each refname before passing - * the refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to - * include broken references in the iteration. If fn ever returns a - * non-zero value, stop the iteration and return that value; - * otherwise, return 0. - */ -static int do_for_each_repo_ref(struct repository *r, const char *prefix, - each_repo_ref_fn fn, int trim, int flags, - void *cb_data) -{ - struct ref_iterator *iter; - struct ref_store *refs = get_main_ref_store(r); - - if (!refs) - return 0; - - iter = refs_ref_iterator_begin(refs, prefix, trim, flags); - - return do_for_each_repo_ref_iterator(r, iter, fn, cb_data); -} - -struct do_for_each_ref_help { - each_ref_fn *fn; - void *cb_data; -}; - -static int do_for_each_ref_helper(struct repository *r, - const char *refname, - const struct object_id *oid, - int flags, - void *cb_data) -{ - struct do_for_each_ref_help *hp = cb_data; - - return hp->fn(refname, oid, flags, hp->cb_data); -} - -static int do_for_each_ref(struct ref_store *refs, const char *prefix, - each_ref_fn fn, int trim, int flags, void *cb_data) -{ - struct ref_iterator *iter; - struct do_for_each_ref_help hp = { fn, cb_data }; - - if (!refs) - return 0; - - iter = refs_ref_iterator_begin(refs, prefix, trim, flags); - - return do_for_each_repo_ref_iterator(the_repository, iter, - do_for_each_ref_helper, &hp); -} - -int refs_for_each_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - return do_for_each_ref(refs, "", fn, 0, 0, cb_data); -} - -int for_each_ref(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_ref(get_main_ref_store(the_repository), fn, cb_data); -} - -int refs_for_each_ref_in(struct ref_store *refs, const char *prefix, - each_ref_fn fn, void *cb_data) -{ - return do_for_each_ref(refs, prefix, fn, strlen(prefix), 0, cb_data); -} - -int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) -{ - return refs_for_each_ref_in(get_main_ref_store(the_repository), prefix, fn, cb_data); -} - -int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken) -{ - unsigned int flag = 0; - - if (broken) - flag = DO_FOR_EACH_INCLUDE_BROKEN; - return do_for_each_ref(get_main_ref_store(the_repository), - prefix, fn, 0, flag, cb_data); -} - -int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix, - each_ref_fn fn, void *cb_data, - unsigned int broken) -{ - unsigned int flag = 0; - - if (broken) - flag = DO_FOR_EACH_INCLUDE_BROKEN; - return do_for_each_ref(refs, prefix, fn, 0, flag, cb_data); -} - -int for_each_replace_ref(struct repository *r, each_repo_ref_fn fn, void *cb_data) -{ - return do_for_each_repo_ref(r, git_replace_ref_base, fn, - strlen(git_replace_ref_base), - DO_FOR_EACH_INCLUDE_BROKEN, cb_data); -} - -int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) -{ - struct strbuf buf = STRBUF_INIT; - int ret; - strbuf_addf(&buf, "%srefs/", get_git_namespace()); - ret = do_for_each_ref(get_main_ref_store(the_repository), - buf.buf, fn, 0, 0, cb_data); - strbuf_release(&buf); - return ret; -} - -int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - return do_for_each_ref(refs, "", fn, 0, - DO_FOR_EACH_INCLUDE_BROKEN, cb_data); -} - -int for_each_rawref(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data); -} - -int refs_read_raw_ref(struct ref_store *ref_store, - const char *refname, struct object_id *oid, - struct strbuf *referent, unsigned int *type) -{ - return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type); -} - -/* This function needs to return a meaningful errno on failure */ -const char *refs_resolve_ref_unsafe(struct ref_store *refs, - const char *refname, - int resolve_flags, - struct object_id *oid, int *flags) -{ - static struct strbuf sb_refname = STRBUF_INIT; - struct object_id unused_oid; - int unused_flags; - int symref_count; - - if (!oid) - oid = &unused_oid; - if (!flags) - flags = &unused_flags; - - *flags = 0; - - if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { - if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || - !refname_is_safe(refname)) { - errno = EINVAL; - return NULL; - } - - /* - * dwim_ref() uses REF_ISBROKEN to distinguish between - * missing refs and refs that were present but invalid, - * to complain about the latter to stderr. - * - * We don't know whether the ref exists, so don't set - * REF_ISBROKEN yet. - */ - *flags |= REF_BAD_NAME; - } - - for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) { - unsigned int read_flags = 0; - - if (refs_read_raw_ref(refs, refname, - oid, &sb_refname, &read_flags)) { - *flags |= read_flags; - - /* In reading mode, refs must eventually resolve */ - if (resolve_flags & RESOLVE_REF_READING) - return NULL; - - /* - * Otherwise a missing ref is OK. But the files backend - * may show errors besides ENOENT if there are - * similarly-named refs. - */ - if (errno != ENOENT && - errno != EISDIR && - errno != ENOTDIR) - return NULL; - - oidclr(oid); - if (*flags & REF_BAD_NAME) - *flags |= REF_ISBROKEN; - return refname; - } - - *flags |= read_flags; - - if (!(read_flags & REF_ISSYMREF)) { - if (*flags & REF_BAD_NAME) { - oidclr(oid); - *flags |= REF_ISBROKEN; - } - return refname; - } - - refname = sb_refname.buf; - if (resolve_flags & RESOLVE_REF_NO_RECURSE) { - oidclr(oid); - return refname; - } - if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { - if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || - !refname_is_safe(refname)) { - errno = EINVAL; - return NULL; - } - - *flags |= REF_ISBROKEN | REF_BAD_NAME; - } - } - - errno = ELOOP; - return NULL; -} - -/* backend functions */ -int refs_init_db(struct strbuf *err) -{ - struct ref_store *refs = get_main_ref_store(the_repository); - - return refs->be->init_db(refs, err); -} - -const char *resolve_ref_unsafe(const char *refname, int resolve_flags, - struct object_id *oid, int *flags) -{ - return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname, - resolve_flags, oid, flags); -} - -int resolve_gitlink_ref(const char *submodule, const char *refname, - struct object_id *oid) -{ - struct ref_store *refs; - int flags; - - refs = get_submodule_ref_store(submodule); - - if (!refs) - return -1; - - if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags) || - is_null_oid(oid)) - return -1; - return 0; -} - -struct ref_store_hash_entry -{ - struct hashmap_entry ent; /* must be the first member! */ - - struct ref_store *refs; - - /* NUL-terminated identifier of the ref store: */ - char name[FLEX_ARRAY]; -}; - -static int ref_store_hash_cmp(const void *unused_cmp_data, - const void *entry, const void *entry_or_key, - const void *keydata) -{ - const struct ref_store_hash_entry *e1 = entry, *e2 = entry_or_key; - const char *name = keydata ? keydata : e2->name; - - return strcmp(e1->name, name); -} - -static struct ref_store_hash_entry *alloc_ref_store_hash_entry( - const char *name, struct ref_store *refs) -{ - struct ref_store_hash_entry *entry; - - FLEX_ALLOC_STR(entry, name, name); - hashmap_entry_init(entry, strhash(name)); - entry->refs = refs; - return entry; -} - -/* A hashmap of ref_stores, stored by submodule name: */ -static struct hashmap submodule_ref_stores; - -/* A hashmap of ref_stores, stored by worktree id: */ -static struct hashmap worktree_ref_stores; - -/* - * Look up a ref store by name. If that ref_store hasn't been - * registered yet, return NULL. - */ -static struct ref_store *lookup_ref_store_map(struct hashmap *map, - const char *name) -{ - struct ref_store_hash_entry *entry; - - if (!map->tablesize) - /* It's initialized on demand in register_ref_store(). */ - return NULL; - - entry = hashmap_get_from_hash(map, strhash(name), name); - return entry ? entry->refs : NULL; -} - -/* - * Create, record, and return a ref_store instance for the specified - * gitdir. - */ -static struct ref_store *ref_store_init(const char *gitdir, - unsigned int flags) -{ - const char *be_name = "files"; - struct ref_storage_be *be = find_ref_storage_backend(be_name); - struct ref_store *refs; - - if (!be) - BUG("reference backend %s is unknown", be_name); - - refs = be->init(gitdir, flags); - return refs; -} - -struct ref_store *get_main_ref_store(struct repository *r) -{ - if (r->refs) - return r->refs; - - if (!r->gitdir) - BUG("attempting to get main_ref_store outside of repository"); - - r->refs = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS); - return r->refs; -} - -/* - * Associate a ref store with a name. It is a fatal error to call this - * function twice for the same name. - */ -static void register_ref_store_map(struct hashmap *map, - const char *type, - struct ref_store *refs, - const char *name) -{ - if (!map->tablesize) - hashmap_init(map, ref_store_hash_cmp, NULL, 0); - - if (hashmap_put(map, alloc_ref_store_hash_entry(name, refs))) - BUG("%s ref_store '%s' initialized twice", type, name); -} - -struct ref_store *get_submodule_ref_store(const char *submodule) -{ - struct strbuf submodule_sb = STRBUF_INIT; - struct ref_store *refs; - char *to_free = NULL; - size_t len; - - if (!submodule) - return NULL; - - len = strlen(submodule); - while (len && is_dir_sep(submodule[len - 1])) - len--; - if (!len) - return NULL; - - if (submodule[len]) - /* We need to strip off one or more trailing slashes */ - submodule = to_free = xmemdupz(submodule, len); - - refs = lookup_ref_store_map(&submodule_ref_stores, submodule); - if (refs) - goto done; - - strbuf_addstr(&submodule_sb, submodule); - if (!is_nonbare_repository_dir(&submodule_sb)) - goto done; - - if (submodule_to_gitdir(&submodule_sb, submodule)) - goto done; - - /* assume that add_submodule_odb() has been called */ - refs = ref_store_init(submodule_sb.buf, - REF_STORE_READ | REF_STORE_ODB); - register_ref_store_map(&submodule_ref_stores, "submodule", - refs, submodule); - -done: - strbuf_release(&submodule_sb); - free(to_free); - - return refs; -} - -struct ref_store *get_worktree_ref_store(const struct worktree *wt) -{ - struct ref_store *refs; - const char *id; - - if (wt->is_current) - return get_main_ref_store(the_repository); - - id = wt->id ? wt->id : "/"; - refs = lookup_ref_store_map(&worktree_ref_stores, id); - if (refs) - return refs; - - if (wt->id) - refs = ref_store_init(git_common_path("worktrees/%s", wt->id), - REF_STORE_ALL_CAPS); - else - refs = ref_store_init(get_git_common_dir(), - REF_STORE_ALL_CAPS); - - if (refs) - register_ref_store_map(&worktree_ref_stores, "worktree", - refs, id); - return refs; -} - -void base_ref_store_init(struct ref_store *refs, - const struct ref_storage_be *be) -{ - refs->be = be; -} - -/* backend functions */ -int refs_pack_refs(struct ref_store *refs, unsigned int flags) -{ - return refs->be->pack_refs(refs, flags); -} - -int refs_peel_ref(struct ref_store *refs, const char *refname, - struct object_id *oid) -{ - int flag; - struct object_id base; - - if (current_ref_iter && current_ref_iter->refname == refname) { - struct object_id peeled; - - if (ref_iterator_peel(current_ref_iter, &peeled)) - return -1; - oidcpy(oid, &peeled); - return 0; - } - - if (refs_read_ref_full(refs, refname, - RESOLVE_REF_READING, &base, &flag)) - return -1; - - return peel_object(&base, oid); -} - -int peel_ref(const char *refname, struct object_id *oid) -{ - return refs_peel_ref(get_main_ref_store(the_repository), refname, oid); -} - -int refs_create_symref(struct ref_store *refs, - const char *ref_target, - const char *refs_heads_master, - const char *logmsg) -{ - return refs->be->create_symref(refs, ref_target, - refs_heads_master, - logmsg); -} - -int create_symref(const char *ref_target, const char *refs_heads_master, - const char *logmsg) -{ - return refs_create_symref(get_main_ref_store(the_repository), ref_target, - refs_heads_master, logmsg); -} - -int ref_update_reject_duplicates(struct string_list *refnames, - struct strbuf *err) -{ - size_t i, n = refnames->nr; - - assert(err); - - for (i = 1; i < n; i++) { - int cmp = strcmp(refnames->items[i - 1].string, - refnames->items[i].string); - - if (!cmp) { - strbuf_addf(err, - _("multiple updates for ref '%s' not allowed"), - refnames->items[i].string); - return 1; - } else if (cmp > 0) { - BUG("ref_update_reject_duplicates() received unsorted list"); - } - } - return 0; -} - -int ref_transaction_prepare(struct ref_transaction *transaction, - struct strbuf *err) -{ - struct ref_store *refs = transaction->ref_store; - - switch (transaction->state) { - case REF_TRANSACTION_OPEN: - /* Good. */ - break; - case REF_TRANSACTION_PREPARED: - BUG("prepare called twice on reference transaction"); - break; - case REF_TRANSACTION_CLOSED: - BUG("prepare called on a closed reference transaction"); - break; - default: - BUG("unexpected reference transaction state"); - break; - } - - if (getenv(GIT_QUARANTINE_ENVIRONMENT)) { - strbuf_addstr(err, - _("ref updates forbidden inside quarantine environment")); - return -1; - } - - return refs->be->transaction_prepare(refs, transaction, err); -} - -int ref_transaction_abort(struct ref_transaction *transaction, - struct strbuf *err) -{ - struct ref_store *refs = transaction->ref_store; - int ret = 0; - - switch (transaction->state) { - case REF_TRANSACTION_OPEN: - /* No need to abort explicitly. */ - break; - case REF_TRANSACTION_PREPARED: - ret = refs->be->transaction_abort(refs, transaction, err); - break; - case REF_TRANSACTION_CLOSED: - BUG("abort called on a closed reference transaction"); - break; - default: - BUG("unexpected reference transaction state"); - break; - } - - ref_transaction_free(transaction); - return ret; -} - -int ref_transaction_commit(struct ref_transaction *transaction, - struct strbuf *err) -{ - struct ref_store *refs = transaction->ref_store; - int ret; - - switch (transaction->state) { - case REF_TRANSACTION_OPEN: - /* Need to prepare first. */ - ret = ref_transaction_prepare(transaction, err); - if (ret) - return ret; - break; - case REF_TRANSACTION_PREPARED: - /* Fall through to finish. */ - break; - case REF_TRANSACTION_CLOSED: - BUG("commit called on a closed reference transaction"); - break; - default: - BUG("unexpected reference transaction state"); - break; - } - - return refs->be->transaction_finish(refs, transaction, err); -} - -int refs_verify_refname_available(struct ref_store *refs, - const char *refname, - const struct string_list *extras, - const struct string_list *skip, - struct strbuf *err) -{ - const char *slash; - const char *extra_refname; - struct strbuf dirname = STRBUF_INIT; - struct strbuf referent = STRBUF_INIT; - struct object_id oid; - unsigned int type; - struct ref_iterator *iter; - int ok; - int ret = -1; - - /* - * For the sake of comments in this function, suppose that - * refname is "refs/foo/bar". - */ - - assert(err); - - strbuf_grow(&dirname, strlen(refname) + 1); - for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { - /* Expand dirname to the new prefix, not including the trailing slash: */ - strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len); - - /* - * We are still at a leading dir of the refname (e.g., - * "refs/foo"; if there is a reference with that name, - * it is a conflict, *unless* it is in skip. - */ - if (skip && string_list_has_string(skip, dirname.buf)) - continue; - - if (!refs_read_raw_ref(refs, dirname.buf, &oid, &referent, &type)) { - strbuf_addf(err, _("'%s' exists; cannot create '%s'"), - dirname.buf, refname); - goto cleanup; - } - - if (extras && string_list_has_string(extras, dirname.buf)) { - strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"), - refname, dirname.buf); - goto cleanup; - } - } - - /* - * We are at the leaf of our refname (e.g., "refs/foo/bar"). - * There is no point in searching for a reference with that - * name, because a refname isn't considered to conflict with - * itself. But we still need to check for references whose - * names are in the "refs/foo/bar/" namespace, because they - * *do* conflict. - */ - strbuf_addstr(&dirname, refname + dirname.len); - strbuf_addch(&dirname, '/'); - - iter = refs_ref_iterator_begin(refs, dirname.buf, 0, - DO_FOR_EACH_INCLUDE_BROKEN); - while ((ok = ref_iterator_advance(iter)) == ITER_OK) { - if (skip && - string_list_has_string(skip, iter->refname)) - continue; - - strbuf_addf(err, _("'%s' exists; cannot create '%s'"), - iter->refname, refname); - ref_iterator_abort(iter); - goto cleanup; - } - - if (ok != ITER_DONE) - BUG("error while iterating over references"); - - extra_refname = find_descendant_ref(dirname.buf, extras, skip); - if (extra_refname) - strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"), - refname, extra_refname); - else - ret = 0; - -cleanup: - strbuf_release(&referent); - strbuf_release(&dirname); - return ret; -} - -int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data) -{ - struct ref_iterator *iter; - struct do_for_each_ref_help hp = { fn, cb_data }; - - iter = refs->be->reflog_iterator_begin(refs); - - return do_for_each_repo_ref_iterator(the_repository, iter, - do_for_each_ref_helper, &hp); -} - -int for_each_reflog(each_ref_fn fn, void *cb_data) -{ - return refs_for_each_reflog(get_main_ref_store(the_repository), fn, cb_data); -} - -int refs_for_each_reflog_ent_reverse(struct ref_store *refs, - const char *refname, - each_reflog_ent_fn fn, - void *cb_data) -{ - return refs->be->for_each_reflog_ent_reverse(refs, refname, - fn, cb_data); -} - -int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, - void *cb_data) -{ - return refs_for_each_reflog_ent_reverse(get_main_ref_store(the_repository), - refname, fn, cb_data); -} - -int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname, - each_reflog_ent_fn fn, void *cb_data) -{ - return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data); -} - -int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, - void *cb_data) -{ - return refs_for_each_reflog_ent(get_main_ref_store(the_repository), refname, - fn, cb_data); -} - -int refs_reflog_exists(struct ref_store *refs, const char *refname) -{ - return refs->be->reflog_exists(refs, refname); -} - -int reflog_exists(const char *refname) -{ - return refs_reflog_exists(get_main_ref_store(the_repository), refname); -} - -int refs_create_reflog(struct ref_store *refs, const char *refname, - int force_create, struct strbuf *err) -{ - return refs->be->create_reflog(refs, refname, force_create, err); -} - -int safe_create_reflog(const char *refname, int force_create, - struct strbuf *err) -{ - return refs_create_reflog(get_main_ref_store(the_repository), refname, - force_create, err); -} - -int refs_delete_reflog(struct ref_store *refs, const char *refname) -{ - return refs->be->delete_reflog(refs, refname); -} - -int delete_reflog(const char *refname) -{ - return refs_delete_reflog(get_main_ref_store(the_repository), refname); -} - -int refs_reflog_expire(struct ref_store *refs, - const char *refname, const struct object_id *oid, - unsigned int flags, - reflog_expiry_prepare_fn prepare_fn, - reflog_expiry_should_prune_fn should_prune_fn, - reflog_expiry_cleanup_fn cleanup_fn, - void *policy_cb_data) -{ - return refs->be->reflog_expire(refs, refname, oid, flags, - prepare_fn, should_prune_fn, - cleanup_fn, policy_cb_data); -} - -int reflog_expire(const char *refname, const struct object_id *oid, - unsigned int flags, - reflog_expiry_prepare_fn prepare_fn, - reflog_expiry_should_prune_fn should_prune_fn, - reflog_expiry_cleanup_fn cleanup_fn, - void *policy_cb_data) -{ - return refs_reflog_expire(get_main_ref_store(the_repository), - refname, oid, flags, - prepare_fn, should_prune_fn, - cleanup_fn, policy_cb_data); -} - -int initial_ref_transaction_commit(struct ref_transaction *transaction, - struct strbuf *err) -{ - struct ref_store *refs = transaction->ref_store; - - return refs->be->initial_transaction_commit(refs, transaction, err); -} - -int refs_delete_refs(struct ref_store *refs, const char *msg, - struct string_list *refnames, unsigned int flags) -{ - return refs->be->delete_refs(refs, msg, refnames, flags); -} - -int delete_refs(const char *msg, struct string_list *refnames, - unsigned int flags) -{ - return refs_delete_refs(get_main_ref_store(the_repository), msg, refnames, flags); -} - -int refs_rename_ref(struct ref_store *refs, const char *oldref, - const char *newref, const char *logmsg) -{ - return refs->be->rename_ref(refs, oldref, newref, logmsg); -} - -int rename_ref(const char *oldref, const char *newref, const char *logmsg) -{ - return refs_rename_ref(get_main_ref_store(the_repository), oldref, newref, logmsg); -} - -int refs_copy_existing_ref(struct ref_store *refs, const char *oldref, - const char *newref, const char *logmsg) -{ - return refs->be->copy_ref(refs, oldref, newref, logmsg); -} - -int copy_existing_ref(const char *oldref, const char *newref, const char *logmsg) -{ - return refs_copy_existing_ref(get_main_ref_store(the_repository), oldref, newref, logmsg); -} |