/*
* 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;
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 struct hashmap_entry *eptr,
const struct hashmap_entry *entry_or_key,
const void *keydata)
{
const struct ref_store_hash_entry *e1, *e2;
const char *name;
e1 = container_of(eptr, const struct ref_store_hash_entry, ent);
e2 = container_of(entry_or_key, const struct ref_store_hash_entry, ent);
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->ent, 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;
unsigned int hash;
if (!map->tablesize)
/* It's initialized on demand in register_ref_store(). */
return NULL;
hash = strhash(name);
entry = hashmap_get_entry_from_hash(map, hash, name,
struct ref_store_hash_entry, ent);
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)
{
struct ref_store_hash_entry *entry;
if (!map->tablesize)
hashmap_init(map, ref_store_hash_cmp, NULL, 0);
entry = alloc_ref_store_hash_entry(name, refs);
if (hashmap_put(map, &entry->ent))
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);
}
