diff options
Diffstat (limited to 'third_party/git/sha1-name.c')
| -rw-r--r-- | third_party/git/sha1-name.c | 1954 |
1 files changed, 0 insertions, 1954 deletions
diff --git a/third_party/git/sha1-name.c b/third_party/git/sha1-name.c deleted file mode 100644 index 0b23b86ceb44..000000000000 --- a/third_party/git/sha1-name.c +++ /dev/null @@ -1,1954 +0,0 @@ -#include "cache.h" -#include "config.h" -#include "tag.h" -#include "commit.h" -#include "tree.h" -#include "blob.h" -#include "tree-walk.h" -#include "refs.h" -#include "remote.h" -#include "dir.h" -#include "oid-array.h" -#include "packfile.h" -#include "object-store.h" -#include "repository.h" -#include "submodule.h" -#include "midx.h" -#include "commit-reach.h" - -static int get_oid_oneline(struct repository *r, const char *, struct object_id *, struct commit_list *); - -typedef int (*disambiguate_hint_fn)(struct repository *, const struct object_id *, void *); - -struct disambiguate_state { - int len; /* length of prefix in hex chars */ - char hex_pfx[GIT_MAX_HEXSZ + 1]; - struct object_id bin_pfx; - - struct repository *repo; - disambiguate_hint_fn fn; - void *cb_data; - struct object_id candidate; - unsigned candidate_exists:1; - unsigned candidate_checked:1; - unsigned candidate_ok:1; - unsigned disambiguate_fn_used:1; - unsigned ambiguous:1; - unsigned always_call_fn:1; -}; - -static void update_candidates(struct disambiguate_state *ds, const struct object_id *current) -{ - if (ds->always_call_fn) { - ds->ambiguous = ds->fn(ds->repo, current, ds->cb_data) ? 1 : 0; - return; - } - if (!ds->candidate_exists) { - /* this is the first candidate */ - oidcpy(&ds->candidate, current); - ds->candidate_exists = 1; - return; - } else if (oideq(&ds->candidate, current)) { - /* the same as what we already have seen */ - return; - } - - if (!ds->fn) { - /* cannot disambiguate between ds->candidate and current */ - ds->ambiguous = 1; - return; - } - - if (!ds->candidate_checked) { - ds->candidate_ok = ds->fn(ds->repo, &ds->candidate, ds->cb_data); - ds->disambiguate_fn_used = 1; - ds->candidate_checked = 1; - } - - if (!ds->candidate_ok) { - /* discard the candidate; we know it does not satisfy fn */ - oidcpy(&ds->candidate, current); - ds->candidate_checked = 0; - return; - } - - /* if we reach this point, we know ds->candidate satisfies fn */ - if (ds->fn(ds->repo, current, ds->cb_data)) { - /* - * if both current and candidate satisfy fn, we cannot - * disambiguate. - */ - ds->candidate_ok = 0; - ds->ambiguous = 1; - } - - /* otherwise, current can be discarded and candidate is still good */ -} - -static int match_sha(unsigned, const unsigned char *, const unsigned char *); - -static void find_short_object_filename(struct disambiguate_state *ds) -{ - struct object_directory *odb; - - for (odb = ds->repo->objects->odb; odb && !ds->ambiguous; odb = odb->next) { - int pos; - struct oid_array *loose_objects; - - loose_objects = odb_loose_cache(odb, &ds->bin_pfx); - pos = oid_array_lookup(loose_objects, &ds->bin_pfx); - if (pos < 0) - pos = -1 - pos; - while (!ds->ambiguous && pos < loose_objects->nr) { - const struct object_id *oid; - oid = loose_objects->oid + pos; - if (!match_sha(ds->len, ds->bin_pfx.hash, oid->hash)) - break; - update_candidates(ds, oid); - pos++; - } - } -} - -static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b) -{ - do { - if (*a != *b) - return 0; - a++; - b++; - len -= 2; - } while (len > 1); - if (len) - if ((*a ^ *b) & 0xf0) - return 0; - return 1; -} - -static void unique_in_midx(struct multi_pack_index *m, - struct disambiguate_state *ds) -{ - uint32_t num, i, first = 0; - const struct object_id *current = NULL; - num = m->num_objects; - - if (!num) - return; - - bsearch_midx(&ds->bin_pfx, m, &first); - - /* - * At this point, "first" is the location of the lowest object - * with an object name that could match "bin_pfx". See if we have - * 0, 1 or more objects that actually match(es). - */ - for (i = first; i < num && !ds->ambiguous; i++) { - struct object_id oid; - current = nth_midxed_object_oid(&oid, m, i); - if (!match_sha(ds->len, ds->bin_pfx.hash, current->hash)) - break; - update_candidates(ds, current); - } -} - -static void unique_in_pack(struct packed_git *p, - struct disambiguate_state *ds) -{ - uint32_t num, i, first = 0; - - if (p->multi_pack_index) - return; - - if (open_pack_index(p) || !p->num_objects) - return; - - num = p->num_objects; - bsearch_pack(&ds->bin_pfx, p, &first); - - /* - * At this point, "first" is the location of the lowest object - * with an object name that could match "bin_pfx". See if we have - * 0, 1 or more objects that actually match(es). - */ - for (i = first; i < num && !ds->ambiguous; i++) { - struct object_id oid; - nth_packed_object_id(&oid, p, i); - if (!match_sha(ds->len, ds->bin_pfx.hash, oid.hash)) - break; - update_candidates(ds, &oid); - } -} - -static void find_short_packed_object(struct disambiguate_state *ds) -{ - struct multi_pack_index *m; - struct packed_git *p; - - for (m = get_multi_pack_index(ds->repo); m && !ds->ambiguous; - m = m->next) - unique_in_midx(m, ds); - for (p = get_packed_git(ds->repo); p && !ds->ambiguous; - p = p->next) - unique_in_pack(p, ds); -} - -static int finish_object_disambiguation(struct disambiguate_state *ds, - struct object_id *oid) -{ - if (ds->ambiguous) - return SHORT_NAME_AMBIGUOUS; - - if (!ds->candidate_exists) - return MISSING_OBJECT; - - if (!ds->candidate_checked) - /* - * If this is the only candidate, there is no point - * calling the disambiguation hint callback. - * - * On the other hand, if the current candidate - * replaced an earlier candidate that did _not_ pass - * the disambiguation hint callback, then we do have - * more than one objects that match the short name - * given, so we should make sure this one matches; - * otherwise, if we discovered this one and the one - * that we previously discarded in the reverse order, - * we would end up showing different results in the - * same repository! - */ - ds->candidate_ok = (!ds->disambiguate_fn_used || - ds->fn(ds->repo, &ds->candidate, ds->cb_data)); - - if (!ds->candidate_ok) - return SHORT_NAME_AMBIGUOUS; - - oidcpy(oid, &ds->candidate); - return 0; -} - -static int disambiguate_commit_only(struct repository *r, - const struct object_id *oid, - void *cb_data_unused) -{ - int kind = oid_object_info(r, oid, NULL); - return kind == OBJ_COMMIT; -} - -static int disambiguate_committish_only(struct repository *r, - const struct object_id *oid, - void *cb_data_unused) -{ - struct object *obj; - int kind; - - kind = oid_object_info(r, oid, NULL); - if (kind == OBJ_COMMIT) - return 1; - if (kind != OBJ_TAG) - return 0; - - /* We need to do this the hard way... */ - obj = deref_tag(r, parse_object(r, oid), NULL, 0); - if (obj && obj->type == OBJ_COMMIT) - return 1; - return 0; -} - -static int disambiguate_tree_only(struct repository *r, - const struct object_id *oid, - void *cb_data_unused) -{ - int kind = oid_object_info(r, oid, NULL); - return kind == OBJ_TREE; -} - -static int disambiguate_treeish_only(struct repository *r, - const struct object_id *oid, - void *cb_data_unused) -{ - struct object *obj; - int kind; - - kind = oid_object_info(r, oid, NULL); - if (kind == OBJ_TREE || kind == OBJ_COMMIT) - return 1; - if (kind != OBJ_TAG) - return 0; - - /* We need to do this the hard way... */ - obj = deref_tag(r, parse_object(r, oid), NULL, 0); - if (obj && (obj->type == OBJ_TREE || obj->type == OBJ_COMMIT)) - return 1; - return 0; -} - -static int disambiguate_blob_only(struct repository *r, - const struct object_id *oid, - void *cb_data_unused) -{ - int kind = oid_object_info(r, oid, NULL); - return kind == OBJ_BLOB; -} - -static disambiguate_hint_fn default_disambiguate_hint; - -int set_disambiguate_hint_config(const char *var, const char *value) -{ - static const struct { - const char *name; - disambiguate_hint_fn fn; - } hints[] = { - { "none", NULL }, - { "commit", disambiguate_commit_only }, - { "committish", disambiguate_committish_only }, - { "tree", disambiguate_tree_only }, - { "treeish", disambiguate_treeish_only }, - { "blob", disambiguate_blob_only } - }; - int i; - - if (!value) - return config_error_nonbool(var); - - for (i = 0; i < ARRAY_SIZE(hints); i++) { - if (!strcasecmp(value, hints[i].name)) { - default_disambiguate_hint = hints[i].fn; - return 0; - } - } - - return error("unknown hint type for '%s': %s", var, value); -} - -static int init_object_disambiguation(struct repository *r, - const char *name, int len, - struct disambiguate_state *ds) -{ - int i; - - if (len < MINIMUM_ABBREV || len > the_hash_algo->hexsz) - return -1; - - memset(ds, 0, sizeof(*ds)); - - for (i = 0; i < len ;i++) { - unsigned char c = name[i]; - unsigned char val; - if (c >= '0' && c <= '9') - val = c - '0'; - else if (c >= 'a' && c <= 'f') - val = c - 'a' + 10; - else if (c >= 'A' && c <='F') { - val = c - 'A' + 10; - c -= 'A' - 'a'; - } - else - return -1; - ds->hex_pfx[i] = c; - if (!(i & 1)) - val <<= 4; - ds->bin_pfx.hash[i >> 1] |= val; - } - - ds->len = len; - ds->hex_pfx[len] = '\0'; - ds->repo = r; - prepare_alt_odb(r); - return 0; -} - -static int show_ambiguous_object(const struct object_id *oid, void *data) -{ - const struct disambiguate_state *ds = data; - struct strbuf desc = STRBUF_INIT; - int type; - - if (ds->fn && !ds->fn(ds->repo, oid, ds->cb_data)) - return 0; - - type = oid_object_info(ds->repo, oid, NULL); - if (type == OBJ_COMMIT) { - struct commit *commit = lookup_commit(ds->repo, oid); - if (commit) { - struct pretty_print_context pp = {0}; - pp.date_mode.type = DATE_SHORT; - format_commit_message(commit, " %ad - %s", &desc, &pp); - } - } else if (type == OBJ_TAG) { - struct tag *tag = lookup_tag(ds->repo, oid); - if (!parse_tag(tag) && tag->tag) - strbuf_addf(&desc, " %s", tag->tag); - } - - advise(" %s %s%s", - repo_find_unique_abbrev(ds->repo, oid, DEFAULT_ABBREV), - type_name(type) ? type_name(type) : "unknown type", - desc.buf); - - strbuf_release(&desc); - return 0; -} - -static int collect_ambiguous(const struct object_id *oid, void *data) -{ - oid_array_append(data, oid); - return 0; -} - -static int repo_collect_ambiguous(struct repository *r, - const struct object_id *oid, - void *data) -{ - return collect_ambiguous(oid, data); -} - -static int sort_ambiguous(const void *a, const void *b, void *ctx) -{ - struct repository *sort_ambiguous_repo = ctx; - int a_type = oid_object_info(sort_ambiguous_repo, a, NULL); - int b_type = oid_object_info(sort_ambiguous_repo, b, NULL); - int a_type_sort; - int b_type_sort; - - /* - * Sorts by hash within the same object type, just as - * oid_array_for_each_unique() would do. - */ - if (a_type == b_type) - return oidcmp(a, b); - - /* - * Between object types show tags, then commits, and finally - * trees and blobs. - * - * The object_type enum is commit, tree, blob, tag, but we - * want tag, commit, tree blob. Cleverly (perhaps too - * cleverly) do that with modulus, since the enum assigns 1 to - * commit, so tag becomes 0. - */ - a_type_sort = a_type % 4; - b_type_sort = b_type % 4; - return a_type_sort > b_type_sort ? 1 : -1; -} - -static void sort_ambiguous_oid_array(struct repository *r, struct oid_array *a) -{ - QSORT_S(a->oid, a->nr, sort_ambiguous, r); -} - -static enum get_oid_result get_short_oid(struct repository *r, - const char *name, int len, - struct object_id *oid, - unsigned flags) -{ - int status; - struct disambiguate_state ds; - int quietly = !!(flags & GET_OID_QUIETLY); - - if (init_object_disambiguation(r, name, len, &ds) < 0) - return -1; - - if (HAS_MULTI_BITS(flags & GET_OID_DISAMBIGUATORS)) - BUG("multiple get_short_oid disambiguator flags"); - - if (flags & GET_OID_COMMIT) - ds.fn = disambiguate_commit_only; - else if (flags & GET_OID_COMMITTISH) - ds.fn = disambiguate_committish_only; - else if (flags & GET_OID_TREE) - ds.fn = disambiguate_tree_only; - else if (flags & GET_OID_TREEISH) - ds.fn = disambiguate_treeish_only; - else if (flags & GET_OID_BLOB) - ds.fn = disambiguate_blob_only; - else - ds.fn = default_disambiguate_hint; - - find_short_object_filename(&ds); - find_short_packed_object(&ds); - status = finish_object_disambiguation(&ds, oid); - - /* - * If we didn't find it, do the usual reprepare() slow-path, - * since the object may have recently been added to the repository - * or migrated from loose to packed. - */ - if (status == MISSING_OBJECT) { - reprepare_packed_git(r); - find_short_object_filename(&ds); - find_short_packed_object(&ds); - status = finish_object_disambiguation(&ds, oid); - } - - if (!quietly && (status == SHORT_NAME_AMBIGUOUS)) { - struct oid_array collect = OID_ARRAY_INIT; - - error(_("short SHA1 %s is ambiguous"), ds.hex_pfx); - - /* - * We may still have ambiguity if we simply saw a series of - * candidates that did not satisfy our hint function. In - * that case, we still want to show them, so disable the hint - * function entirely. - */ - if (!ds.ambiguous) - ds.fn = NULL; - - advise(_("The candidates are:")); - repo_for_each_abbrev(r, ds.hex_pfx, collect_ambiguous, &collect); - sort_ambiguous_oid_array(r, &collect); - - if (oid_array_for_each(&collect, show_ambiguous_object, &ds)) - BUG("show_ambiguous_object shouldn't return non-zero"); - oid_array_clear(&collect); - } - - return status; -} - -int repo_for_each_abbrev(struct repository *r, const char *prefix, - each_abbrev_fn fn, void *cb_data) -{ - struct oid_array collect = OID_ARRAY_INIT; - struct disambiguate_state ds; - int ret; - - if (init_object_disambiguation(r, prefix, strlen(prefix), &ds) < 0) - return -1; - - ds.always_call_fn = 1; - ds.fn = repo_collect_ambiguous; - ds.cb_data = &collect; - find_short_object_filename(&ds); - find_short_packed_object(&ds); - - ret = oid_array_for_each_unique(&collect, fn, cb_data); - oid_array_clear(&collect); - return ret; -} - -/* - * Return the slot of the most-significant bit set in "val". There are various - * ways to do this quickly with fls() or __builtin_clzl(), but speed is - * probably not a big deal here. - */ -static unsigned msb(unsigned long val) -{ - unsigned r = 0; - while (val >>= 1) - r++; - return r; -} - -struct min_abbrev_data { - unsigned int init_len; - unsigned int cur_len; - char *hex; - struct repository *repo; - const struct object_id *oid; -}; - -static inline char get_hex_char_from_oid(const struct object_id *oid, - unsigned int pos) -{ - static const char hex[] = "0123456789abcdef"; - - if ((pos & 1) == 0) - return hex[oid->hash[pos >> 1] >> 4]; - else - return hex[oid->hash[pos >> 1] & 0xf]; -} - -static int extend_abbrev_len(const struct object_id *oid, void *cb_data) -{ - struct min_abbrev_data *mad = cb_data; - - unsigned int i = mad->init_len; - while (mad->hex[i] && mad->hex[i] == get_hex_char_from_oid(oid, i)) - i++; - - if (i < GIT_MAX_RAWSZ && i >= mad->cur_len) - mad->cur_len = i + 1; - - return 0; -} - -static int repo_extend_abbrev_len(struct repository *r, - const struct object_id *oid, - void *cb_data) -{ - return extend_abbrev_len(oid, cb_data); -} - -static void find_abbrev_len_for_midx(struct multi_pack_index *m, - struct min_abbrev_data *mad) -{ - int match = 0; - uint32_t num, first = 0; - struct object_id oid; - const struct object_id *mad_oid; - - if (!m->num_objects) - return; - - num = m->num_objects; - mad_oid = mad->oid; - match = bsearch_midx(mad_oid, m, &first); - - /* - * first is now the position in the packfile where we would insert - * mad->hash if it does not exist (or the position of mad->hash if - * it does exist). Hence, we consider a maximum of two objects - * nearby for the abbreviation length. - */ - mad->init_len = 0; - if (!match) { - if (nth_midxed_object_oid(&oid, m, first)) - extend_abbrev_len(&oid, mad); - } else if (first < num - 1) { - if (nth_midxed_object_oid(&oid, m, first + 1)) - extend_abbrev_len(&oid, mad); - } - if (first > 0) { - if (nth_midxed_object_oid(&oid, m, first - 1)) - extend_abbrev_len(&oid, mad); - } - mad->init_len = mad->cur_len; -} - -static void find_abbrev_len_for_pack(struct packed_git *p, - struct min_abbrev_data *mad) -{ - int match = 0; - uint32_t num, first = 0; - struct object_id oid; - const struct object_id *mad_oid; - - if (p->multi_pack_index) - return; - - if (open_pack_index(p) || !p->num_objects) - return; - - num = p->num_objects; - mad_oid = mad->oid; - match = bsearch_pack(mad_oid, p, &first); - - /* - * first is now the position in the packfile where we would insert - * mad->hash if it does not exist (or the position of mad->hash if - * it does exist). Hence, we consider a maximum of two objects - * nearby for the abbreviation length. - */ - mad->init_len = 0; - if (!match) { - if (!nth_packed_object_id(&oid, p, first)) - extend_abbrev_len(&oid, mad); - } else if (first < num - 1) { - if (!nth_packed_object_id(&oid, p, first + 1)) - extend_abbrev_len(&oid, mad); - } - if (first > 0) { - if (!nth_packed_object_id(&oid, p, first - 1)) - extend_abbrev_len(&oid, mad); - } - mad->init_len = mad->cur_len; -} - -static void find_abbrev_len_packed(struct min_abbrev_data *mad) -{ - struct multi_pack_index *m; - struct packed_git *p; - - for (m = get_multi_pack_index(mad->repo); m; m = m->next) - find_abbrev_len_for_midx(m, mad); - for (p = get_packed_git(mad->repo); p; p = p->next) - find_abbrev_len_for_pack(p, mad); -} - -int repo_find_unique_abbrev_r(struct repository *r, char *hex, - const struct object_id *oid, int len) -{ - struct disambiguate_state ds; - struct min_abbrev_data mad; - struct object_id oid_ret; - const unsigned hexsz = r->hash_algo->hexsz; - - if (len < 0) { - unsigned long count = repo_approximate_object_count(r); - /* - * Add one because the MSB only tells us the highest bit set, - * not including the value of all the _other_ bits (so "15" - * is only one off of 2^4, but the MSB is the 3rd bit. - */ - len = msb(count) + 1; - /* - * We now know we have on the order of 2^len objects, which - * expects a collision at 2^(len/2). But we also care about hex - * chars, not bits, and there are 4 bits per hex. So all - * together we need to divide by 2 and round up. - */ - len = DIV_ROUND_UP(len, 2); - /* - * For very small repos, we stick with our regular fallback. - */ - if (len < FALLBACK_DEFAULT_ABBREV) - len = FALLBACK_DEFAULT_ABBREV; - } - - oid_to_hex_r(hex, oid); - if (len == hexsz || !len) - return hexsz; - - mad.repo = r; - mad.init_len = len; - mad.cur_len = len; - mad.hex = hex; - mad.oid = oid; - - find_abbrev_len_packed(&mad); - - if (init_object_disambiguation(r, hex, mad.cur_len, &ds) < 0) - return -1; - - ds.fn = repo_extend_abbrev_len; - ds.always_call_fn = 1; - ds.cb_data = (void *)&mad; - - find_short_object_filename(&ds); - (void)finish_object_disambiguation(&ds, &oid_ret); - - hex[mad.cur_len] = 0; - return mad.cur_len; -} - -const char *repo_find_unique_abbrev(struct repository *r, - const struct object_id *oid, - int len) -{ - static int bufno; - static char hexbuffer[4][GIT_MAX_HEXSZ + 1]; - char *hex = hexbuffer[bufno]; - bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer); - repo_find_unique_abbrev_r(r, hex, oid, len); - return hex; -} - -static int ambiguous_path(const char *path, int len) -{ - int slash = 1; - int cnt; - - for (cnt = 0; cnt < len; cnt++) { - switch (*path++) { - case '\0': - break; - case '/': - if (slash) - break; - slash = 1; - continue; - case '.': - continue; - default: - slash = 0; - continue; - } - break; - } - return slash; -} - -static inline int at_mark(const char *string, int len, - const char **suffix, int nr) -{ - int i; - - for (i = 0; i < nr; i++) { - int suffix_len = strlen(suffix[i]); - if (suffix_len <= len - && !strncasecmp(string, suffix[i], suffix_len)) - return suffix_len; - } - return 0; -} - -static inline int upstream_mark(const char *string, int len) -{ - const char *suffix[] = { "@{upstream}", "@{u}" }; - return at_mark(string, len, suffix, ARRAY_SIZE(suffix)); -} - -static inline int push_mark(const char *string, int len) -{ - const char *suffix[] = { "@{push}" }; - return at_mark(string, len, suffix, ARRAY_SIZE(suffix)); -} - -static enum get_oid_result get_oid_1(struct repository *r, const char *name, int len, struct object_id *oid, unsigned lookup_flags); -static int interpret_nth_prior_checkout(struct repository *r, const char *name, int namelen, struct strbuf *buf); - -static int get_oid_basic(struct repository *r, const char *str, int len, - struct object_id *oid, unsigned int flags) -{ - static const char *warn_msg = "refname '%.*s' is ambiguous."; - static const char *object_name_msg = N_( - "Git normally never creates a ref that ends with 40 hex characters\n" - "because it will be ignored when you just specify 40-hex. These refs\n" - "may be created by mistake. For example,\n" - "\n" - " git switch -c $br $(git rev-parse ...)\n" - "\n" - "where \"$br\" is somehow empty and a 40-hex ref is created. Please\n" - "examine these refs and maybe delete them. Turn this message off by\n" - "running \"git config advice.objectNameWarning false\""); - struct object_id tmp_oid; - char *real_ref = NULL; - int refs_found = 0; - int at, reflog_len, nth_prior = 0; - - if (len == r->hash_algo->hexsz && !get_oid_hex(str, oid)) { - if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) { - refs_found = repo_dwim_ref(r, str, len, &tmp_oid, &real_ref, 0); - if (refs_found > 0) { - warning(warn_msg, len, str); - if (advice_object_name_warning) - fprintf(stderr, "%s\n", _(object_name_msg)); - } - free(real_ref); - } - return 0; - } - - /* basic@{time or number or -number} format to query ref-log */ - reflog_len = at = 0; - if (len && str[len-1] == '}') { - for (at = len-4; at >= 0; at--) { - if (str[at] == '@' && str[at+1] == '{') { - if (str[at+2] == '-') { - if (at != 0) - /* @{-N} not at start */ - return -1; - nth_prior = 1; - continue; - } - if (!upstream_mark(str + at, len - at) && - !push_mark(str + at, len - at)) { - reflog_len = (len-1) - (at+2); - len = at; - } - break; - } - } - } - - /* Accept only unambiguous ref paths. */ - if (len && ambiguous_path(str, len)) - return -1; - - if (nth_prior) { - struct strbuf buf = STRBUF_INIT; - int detached; - - if (interpret_nth_prior_checkout(r, str, len, &buf) > 0) { - detached = (buf.len == r->hash_algo->hexsz && !get_oid_hex(buf.buf, oid)); - strbuf_release(&buf); - if (detached) - return 0; - } - } - - if (!len && reflog_len) - /* allow "@{...}" to mean the current branch reflog */ - refs_found = repo_dwim_ref(r, "HEAD", 4, oid, &real_ref, 0); - else if (reflog_len) - refs_found = repo_dwim_log(r, str, len, oid, &real_ref); - else - refs_found = repo_dwim_ref(r, str, len, oid, &real_ref, 0); - - if (!refs_found) - return -1; - - if (warn_ambiguous_refs && !(flags & GET_OID_QUIETLY) && - (refs_found > 1 || - !get_short_oid(r, str, len, &tmp_oid, GET_OID_QUIETLY))) - warning(warn_msg, len, str); - - if (reflog_len) { - int nth, i; - timestamp_t at_time; - timestamp_t co_time; - int co_tz, co_cnt; - - /* Is it asking for N-th entry, or approxidate? */ - for (i = nth = 0; 0 <= nth && i < reflog_len; i++) { - char ch = str[at+2+i]; - if ('0' <= ch && ch <= '9') - nth = nth * 10 + ch - '0'; - else - nth = -1; - } - if (100000000 <= nth) { - at_time = nth; - nth = -1; - } else if (0 <= nth) - at_time = 0; - else { - int errors = 0; - char *tmp = xstrndup(str + at + 2, reflog_len); - at_time = approxidate_careful(tmp, &errors); - free(tmp); - if (errors) { - free(real_ref); - return -1; - } - } - if (read_ref_at(get_main_ref_store(r), - real_ref, flags, at_time, nth, oid, NULL, - &co_time, &co_tz, &co_cnt)) { - if (!len) { - if (!skip_prefix(real_ref, "refs/heads/", &str)) - str = "HEAD"; - len = strlen(str); - } - if (at_time) { - if (!(flags & GET_OID_QUIETLY)) { - warning(_("log for '%.*s' only goes back to %s"), - len, str, - show_date(co_time, co_tz, DATE_MODE(RFC2822))); - } - } else { - if (flags & GET_OID_QUIETLY) { - exit(128); - } - die(_("log for '%.*s' only has %d entries"), - len, str, co_cnt); - } - } - } - - free(real_ref); - return 0; -} - -static enum get_oid_result get_parent(struct repository *r, - const char *name, int len, - struct object_id *result, int idx) -{ - struct object_id oid; - enum get_oid_result ret = get_oid_1(r, name, len, &oid, - GET_OID_COMMITTISH); - struct commit *commit; - struct commit_list *p; - - if (ret) - return ret; - commit = lookup_commit_reference(r, &oid); - if (parse_commit(commit)) - return MISSING_OBJECT; - if (!idx) { - oidcpy(result, &commit->object.oid); - return FOUND; - } - p = commit->parents; - while (p) { - if (!--idx) { - oidcpy(result, &p->item->object.oid); - return FOUND; - } - p = p->next; - } - return MISSING_OBJECT; -} - -static enum get_oid_result get_nth_ancestor(struct repository *r, - const char *name, int len, - struct object_id *result, - int generation) -{ - struct object_id oid; - struct commit *commit; - int ret; - - ret = get_oid_1(r, name, len, &oid, GET_OID_COMMITTISH); - if (ret) - return ret; - commit = lookup_commit_reference(r, &oid); - if (!commit) - return MISSING_OBJECT; - - while (generation--) { - if (parse_commit(commit) || !commit->parents) - return MISSING_OBJECT; - commit = commit->parents->item; - } - oidcpy(result, &commit->object.oid); - return FOUND; -} - -struct object *repo_peel_to_type(struct repository *r, const char *name, int namelen, - struct object *o, enum object_type expected_type) -{ - if (name && !namelen) - namelen = strlen(name); - while (1) { - if (!o || (!o->parsed && !parse_object(r, &o->oid))) - return NULL; - if (expected_type == OBJ_ANY || o->type == expected_type) - return o; - if (o->type == OBJ_TAG) - o = ((struct tag*) o)->tagged; - else if (o->type == OBJ_COMMIT) - o = &(repo_get_commit_tree(r, ((struct commit *)o))->object); - else { - if (name) - error("%.*s: expected %s type, but the object " - "dereferences to %s type", - namelen, name, type_name(expected_type), - type_name(o->type)); - return NULL; - } - } -} - -static int peel_onion(struct repository *r, const char *name, int len, - struct object_id *oid, unsigned lookup_flags) -{ - struct object_id outer; - const char *sp; - unsigned int expected_type = 0; - struct object *o; - - /* - * "ref^{type}" dereferences ref repeatedly until you cannot - * dereference anymore, or you get an object of given type, - * whichever comes first. "ref^{}" means just dereference - * tags until you get a non-tag. "ref^0" is a shorthand for - * "ref^{commit}". "commit^{tree}" could be used to find the - * top-level tree of the given commit. - */ - if (len < 4 || name[len-1] != '}') - return -1; - - for (sp = name + len - 1; name <= sp; sp--) { - int ch = *sp; - if (ch == '{' && name < sp && sp[-1] == '^') - break; - } - if (sp <= name) - return -1; - - sp++; /* beginning of type name, or closing brace for empty */ - if (starts_with(sp, "commit}")) - expected_type = OBJ_COMMIT; - else if (starts_with(sp, "tag}")) - expected_type = OBJ_TAG; - else if (starts_with(sp, "tree}")) - expected_type = OBJ_TREE; - else if (starts_with(sp, "blob}")) - expected_type = OBJ_BLOB; - else if (starts_with(sp, "object}")) - expected_type = OBJ_ANY; - else if (sp[0] == '}') - expected_type = OBJ_NONE; - else if (sp[0] == '/') - expected_type = OBJ_COMMIT; - else - return -1; - - lookup_flags &= ~GET_OID_DISAMBIGUATORS; - if (expected_type == OBJ_COMMIT) - lookup_flags |= GET_OID_COMMITTISH; - else if (expected_type == OBJ_TREE) - lookup_flags |= GET_OID_TREEISH; - - if (get_oid_1(r, name, sp - name - 2, &outer, lookup_flags)) - return -1; - - o = parse_object(r, &outer); - if (!o) - return -1; - if (!expected_type) { - o = deref_tag(r, o, name, sp - name - 2); - if (!o || (!o->parsed && !parse_object(r, &o->oid))) - return -1; - oidcpy(oid, &o->oid); - return 0; - } - - /* - * At this point, the syntax look correct, so - * if we do not get the needed object, we should - * barf. - */ - o = repo_peel_to_type(r, name, len, o, expected_type); - if (!o) - return -1; - - oidcpy(oid, &o->oid); - if (sp[0] == '/') { - /* "$commit^{/foo}" */ - char *prefix; - int ret; - struct commit_list *list = NULL; - - /* - * $commit^{/}. Some regex implementation may reject. - * We don't need regex anyway. '' pattern always matches. - */ - if (sp[1] == '}') - return 0; - - prefix = xstrndup(sp + 1, name + len - 1 - (sp + 1)); - commit_list_insert((struct commit *)o, &list); - ret = get_oid_oneline(r, prefix, oid, list); - free(prefix); - return ret; - } - return 0; -} - -static int get_describe_name(struct repository *r, - const char *name, int len, - struct object_id *oid) -{ - const char *cp; - unsigned flags = GET_OID_QUIETLY | GET_OID_COMMIT; - - for (cp = name + len - 1; name + 2 <= cp; cp--) { - char ch = *cp; - if (!isxdigit(ch)) { - /* We must be looking at g in "SOMETHING-g" - * for it to be describe output. - */ - if (ch == 'g' && cp[-1] == '-') { - cp++; - len -= cp - name; - return get_short_oid(r, - cp, len, oid, flags); - } - } - } - return -1; -} - -static enum get_oid_result get_oid_1(struct repository *r, - const char *name, int len, - struct object_id *oid, - unsigned lookup_flags) -{ - int ret, has_suffix; - const char *cp; - - /* - * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1". - */ - has_suffix = 0; - for (cp = name + len - 1; name <= cp; cp--) { - int ch = *cp; - if ('0' <= ch && ch <= '9') - continue; - if (ch == '~' || ch == '^') - has_suffix = ch; - break; - } - - if (has_suffix) { - unsigned int num = 0; - int len1 = cp - name; - cp++; - while (cp < name + len) { - unsigned int digit = *cp++ - '0'; - if (unsigned_mult_overflows(num, 10)) - return MISSING_OBJECT; - num *= 10; - if (unsigned_add_overflows(num, digit)) - return MISSING_OBJECT; - num += digit; - } - if (!num && len1 == len - 1) - num = 1; - else if (num > INT_MAX) - return MISSING_OBJECT; - if (has_suffix == '^') - return get_parent(r, name, len1, oid, num); - /* else if (has_suffix == '~') -- goes without saying */ - return get_nth_ancestor(r, name, len1, oid, num); - } - - ret = peel_onion(r, name, len, oid, lookup_flags); - if (!ret) - return FOUND; - - ret = get_oid_basic(r, name, len, oid, lookup_flags); - if (!ret) - return FOUND; - - /* It could be describe output that is "SOMETHING-gXXXX" */ - ret = get_describe_name(r, name, len, oid); - if (!ret) - return FOUND; - - return get_short_oid(r, name, len, oid, lookup_flags); -} - -/* - * This interprets names like ':/Initial revision of "git"' by searching - * through history and returning the first commit whose message starts - * the given regular expression. - * - * For negative-matching, prefix the pattern-part with '!-', like: ':/!-WIP'. - * - * For a literal '!' character at the beginning of a pattern, you have to repeat - * that, like: ':/!!foo' - * - * For future extension, all other sequences beginning with ':/!' are reserved. - */ - -/* Remember to update object flag allocation in object.h */ -#define ONELINE_SEEN (1u<<20) - -struct handle_one_ref_cb { - struct repository *repo; - struct commit_list **list; -}; - -static int handle_one_ref(const char *path, const struct object_id *oid, - int flag, void *cb_data) -{ - struct handle_one_ref_cb *cb = cb_data; - struct commit_list **list = cb->list; - struct object *object = parse_object(cb->repo, oid); - if (!object) - return 0; - if (object->type == OBJ_TAG) { - object = deref_tag(cb->repo, object, path, - strlen(path)); - if (!object) - return 0; - } - if (object->type != OBJ_COMMIT) - return 0; - commit_list_insert((struct commit *)object, list); - return 0; -} - -static int get_oid_oneline(struct repository *r, - const char *prefix, struct object_id *oid, - struct commit_list *list) -{ - struct commit_list *backup = NULL, *l; - int found = 0; - int negative = 0; - regex_t regex; - - if (prefix[0] == '!') { - prefix++; - - if (prefix[0] == '-') { - prefix++; - negative = 1; - } else if (prefix[0] != '!') { - return -1; - } - } - - if (regcomp(®ex, prefix, REG_EXTENDED)) - return -1; - - for (l = list; l; l = l->next) { - l->item->object.flags |= ONELINE_SEEN; - commit_list_insert(l->item, &backup); - } - while (list) { - const char *p, *buf; - struct commit *commit; - int matches; - - commit = pop_most_recent_commit(&list, ONELINE_SEEN); - if (!parse_object(r, &commit->object.oid)) - continue; - buf = get_commit_buffer(commit, NULL); - p = strstr(buf, "\n\n"); - matches = negative ^ (p && !regexec(®ex, p + 2, 0, NULL, 0)); - unuse_commit_buffer(commit, buf); - - if (matches) { - oidcpy(oid, &commit->object.oid); - found = 1; - break; - } - } - regfree(®ex); - free_commit_list(list); - for (l = backup; l; l = l->next) - clear_commit_marks(l->item, ONELINE_SEEN); - free_commit_list(backup); - return found ? 0 : -1; -} - -struct grab_nth_branch_switch_cbdata { - int remaining; - struct strbuf *sb; -}; - -static int grab_nth_branch_switch(struct object_id *ooid, struct object_id *noid, - const char *email, timestamp_t timestamp, int tz, - const char *message, void *cb_data) -{ - struct grab_nth_branch_switch_cbdata *cb = cb_data; - const char *match = NULL, *target = NULL; - size_t len; - - if (skip_prefix(message, "checkout: moving from ", &match)) - target = strstr(match, " to "); - - if (!match || !target) - return 0; - if (--(cb->remaining) == 0) { - len = target - match; - strbuf_reset(cb->sb); - strbuf_add(cb->sb, match, len); - return 1; /* we are done */ - } - return 0; -} - -/* - * Parse @{-N} syntax, return the number of characters parsed - * if successful; otherwise signal an error with negative value. - */ -static int interpret_nth_prior_checkout(struct repository *r, - const char *name, int namelen, - struct strbuf *buf) -{ - long nth; - int retval; - struct grab_nth_branch_switch_cbdata cb; - const char *brace; - char *num_end; - - if (namelen < 4) - return -1; - if (name[0] != '@' || name[1] != '{' || name[2] != '-') - return -1; - brace = memchr(name, '}', namelen); - if (!brace) - return -1; - nth = strtol(name + 3, &num_end, 10); - if (num_end != brace) - return -1; - if (nth <= 0) - return -1; - cb.remaining = nth; - cb.sb = buf; - - retval = refs_for_each_reflog_ent_reverse(get_main_ref_store(r), - "HEAD", grab_nth_branch_switch, &cb); - if (0 < retval) { - retval = brace - name + 1; - } else - retval = 0; - - return retval; -} - -int repo_get_oid_mb(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct commit *one, *two; - struct commit_list *mbs; - struct object_id oid_tmp; - const char *dots; - int st; - - dots = strstr(name, "..."); - if (!dots) - return repo_get_oid(r, name, oid); - if (dots == name) - st = repo_get_oid(r, "HEAD", &oid_tmp); - else { - struct strbuf sb; - strbuf_init(&sb, dots - name); - strbuf_add(&sb, name, dots - name); - st = repo_get_oid_committish(r, sb.buf, &oid_tmp); - strbuf_release(&sb); - } - if (st) - return st; - one = lookup_commit_reference_gently(r, &oid_tmp, 0); - if (!one) - return -1; - - if (repo_get_oid_committish(r, dots[3] ? (dots + 3) : "HEAD", &oid_tmp)) - return -1; - two = lookup_commit_reference_gently(r, &oid_tmp, 0); - if (!two) - return -1; - mbs = repo_get_merge_bases(r, one, two); - if (!mbs || mbs->next) - st = -1; - else { - st = 0; - oidcpy(oid, &mbs->item->object.oid); - } - free_commit_list(mbs); - return st; -} - -/* parse @something syntax, when 'something' is not {.*} */ -static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf) -{ - const char *next; - - if (len || name[1] == '{') - return -1; - - /* make sure it's a single @, or @@{.*}, not @foo */ - next = memchr(name + len + 1, '@', namelen - len - 1); - if (next && next[1] != '{') - return -1; - if (!next) - next = name + namelen; - if (next != name + 1) - return -1; - - strbuf_reset(buf); - strbuf_add(buf, "HEAD", 4); - return 1; -} - -static int reinterpret(struct repository *r, - const char *name, int namelen, int len, - struct strbuf *buf, unsigned allowed) -{ - /* we have extra data, which might need further processing */ - struct strbuf tmp = STRBUF_INIT; - int used = buf->len; - int ret; - struct interpret_branch_name_options options = { - .allowed = allowed - }; - - strbuf_add(buf, name + len, namelen - len); - ret = repo_interpret_branch_name(r, buf->buf, buf->len, &tmp, &options); - /* that data was not interpreted, remove our cruft */ - if (ret < 0) { - strbuf_setlen(buf, used); - return len; - } - strbuf_reset(buf); - strbuf_addbuf(buf, &tmp); - strbuf_release(&tmp); - /* tweak for size of {-N} versus expanded ref name */ - return ret - used + len; -} - -static void set_shortened_ref(struct repository *r, struct strbuf *buf, const char *ref) -{ - char *s = refs_shorten_unambiguous_ref(get_main_ref_store(r), ref, 0); - strbuf_reset(buf); - strbuf_addstr(buf, s); - free(s); -} - -static int branch_interpret_allowed(const char *refname, unsigned allowed) -{ - if (!allowed) - return 1; - - if ((allowed & INTERPRET_BRANCH_LOCAL) && - starts_with(refname, "refs/heads/")) - return 1; - if ((allowed & INTERPRET_BRANCH_REMOTE) && - starts_with(refname, "refs/remotes/")) - return 1; - - return 0; -} - -static int interpret_branch_mark(struct repository *r, - const char *name, int namelen, - int at, struct strbuf *buf, - int (*get_mark)(const char *, int), - const char *(*get_data)(struct branch *, - struct strbuf *), - const struct interpret_branch_name_options *options) -{ - int len; - struct branch *branch; - struct strbuf err = STRBUF_INIT; - const char *value; - - len = get_mark(name + at, namelen - at); - if (!len) - return -1; - - if (memchr(name, ':', at)) - return -1; - - if (at) { - char *name_str = xmemdupz(name, at); - branch = branch_get(name_str); - free(name_str); - } else - branch = branch_get(NULL); - - value = get_data(branch, &err); - if (!value) { - if (options->nonfatal_dangling_mark) { - strbuf_release(&err); - return -1; - } else { - die("%s", err.buf); - } - } - - if (!branch_interpret_allowed(value, options->allowed)) - return -1; - - set_shortened_ref(r, buf, value); - return len + at; -} - -int repo_interpret_branch_name(struct repository *r, - const char *name, int namelen, - struct strbuf *buf, - const struct interpret_branch_name_options *options) -{ - char *at; - const char *start; - int len; - - if (!namelen) - namelen = strlen(name); - - if (!options->allowed || (options->allowed & INTERPRET_BRANCH_LOCAL)) { - len = interpret_nth_prior_checkout(r, name, namelen, buf); - if (!len) { - return len; /* syntax Ok, not enough switches */ - } else if (len > 0) { - if (len == namelen) - return len; /* consumed all */ - else - return reinterpret(r, name, namelen, len, buf, - options->allowed); - } - } - - for (start = name; - (at = memchr(start, '@', namelen - (start - name))); - start = at + 1) { - - if (!options->allowed || (options->allowed & INTERPRET_BRANCH_HEAD)) { - len = interpret_empty_at(name, namelen, at - name, buf); - if (len > 0) - return reinterpret(r, name, namelen, len, buf, - options->allowed); - } - - len = interpret_branch_mark(r, name, namelen, at - name, buf, - upstream_mark, branch_get_upstream, - options); - if (len > 0) - return len; - - len = interpret_branch_mark(r, name, namelen, at - name, buf, - push_mark, branch_get_push, - options); - if (len > 0) - return len; - } - - return -1; -} - -void strbuf_branchname(struct strbuf *sb, const char *name, unsigned allowed) -{ - int len = strlen(name); - struct interpret_branch_name_options options = { - .allowed = allowed - }; - int used = interpret_branch_name(name, len, sb, &options); - - if (used < 0) - used = 0; - strbuf_add(sb, name + used, len - used); -} - -int strbuf_check_branch_ref(struct strbuf *sb, const char *name) -{ - if (startup_info->have_repository) - strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL); - else - strbuf_addstr(sb, name); - - /* - * This splice must be done even if we end up rejecting the - * name; builtin/branch.c::copy_or_rename_branch() still wants - * to see what the name expanded to so that "branch -m" can be - * used as a tool to correct earlier mistakes. - */ - strbuf_splice(sb, 0, 0, "refs/heads/", 11); - - if (*name == '-' || - !strcmp(sb->buf, "refs/heads/HEAD")) - return -1; - - return check_refname_format(sb->buf, 0); -} - -/* - * This is like "get_oid_basic()", except it allows "object ID expressions", - * notably "xyz^" for "parent of xyz" - */ -int repo_get_oid(struct repository *r, const char *name, struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, 0, oid, &unused); -} - -/* - * This returns a non-zero value if the string (built using printf - * format and the given arguments) is not a valid object. - */ -int get_oidf(struct object_id *oid, const char *fmt, ...) -{ - va_list ap; - int ret; - struct strbuf sb = STRBUF_INIT; - - va_start(ap, fmt); - strbuf_vaddf(&sb, fmt, ap); - va_end(ap); - - ret = get_oid(sb.buf, oid); - strbuf_release(&sb); - - return ret; -} - -/* - * Many callers know that the user meant to name a commit-ish by - * syntactical positions where the object name appears. Calling this - * function allows the machinery to disambiguate shorter-than-unique - * abbreviated object names between commit-ish and others. - * - * Note that this does NOT error out when the named object is not a - * commit-ish. It is merely to give a hint to the disambiguation - * machinery. - */ -int repo_get_oid_committish(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, GET_OID_COMMITTISH, - oid, &unused); -} - -int repo_get_oid_treeish(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, GET_OID_TREEISH, - oid, &unused); -} - -int repo_get_oid_commit(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, GET_OID_COMMIT, - oid, &unused); -} - -int repo_get_oid_tree(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, GET_OID_TREE, - oid, &unused); -} - -int repo_get_oid_blob(struct repository *r, - const char *name, - struct object_id *oid) -{ - struct object_context unused; - return get_oid_with_context(r, name, GET_OID_BLOB, - oid, &unused); -} - -/* Must be called only when object_name:filename doesn't exist. */ -static void diagnose_invalid_oid_path(struct repository *r, - const char *prefix, - const char *filename, - const struct object_id *tree_oid, - const char *object_name, - int object_name_len) -{ - struct object_id oid; - unsigned short mode; - - if (!prefix) - prefix = ""; - - if (file_exists(filename)) - die(_("path '%s' exists on disk, but not in '%.*s'"), - filename, object_name_len, object_name); - if (is_missing_file_error(errno)) { - char *fullname = xstrfmt("%s%s", prefix, filename); - - if (!get_tree_entry(r, tree_oid, fullname, &oid, &mode)) { - die(_("path '%s' exists, but not '%s'\n" - "hint: Did you mean '%.*s:%s' aka '%.*s:./%s'?"), - fullname, - filename, - object_name_len, object_name, - fullname, - object_name_len, object_name, - filename); - } - die(_("path '%s' does not exist in '%.*s'"), - filename, object_name_len, object_name); - } -} - -/* Must be called only when :stage:filename doesn't exist. */ -static void diagnose_invalid_index_path(struct repository *r, - int stage, - const char *prefix, - const char *filename) -{ - struct index_state *istate = r->index; - const struct cache_entry *ce; - int pos; - unsigned namelen = strlen(filename); - struct strbuf fullname = STRBUF_INIT; - - if (!prefix) - prefix = ""; - - /* Wrong stage number? */ - pos = index_name_pos(istate, filename, namelen); - if (pos < 0) - pos = -pos - 1; - if (pos < istate->cache_nr) { - ce = istate->cache[pos]; - if (ce_namelen(ce) == namelen && - !memcmp(ce->name, filename, namelen)) - die(_("path '%s' is in the index, but not at stage %d\n" - "hint: Did you mean ':%d:%s'?"), - filename, stage, - ce_stage(ce), filename); - } - - /* Confusion between relative and absolute filenames? */ - strbuf_addstr(&fullname, prefix); - strbuf_addstr(&fullname, filename); - pos = index_name_pos(istate, fullname.buf, fullname.len); - if (pos < 0) - pos = -pos - 1; - if (pos < istate->cache_nr) { - ce = istate->cache[pos]; - if (ce_namelen(ce) == fullname.len && - !memcmp(ce->name, fullname.buf, fullname.len)) - die(_("path '%s' is in the index, but not '%s'\n" - "hint: Did you mean ':%d:%s' aka ':%d:./%s'?"), - fullname.buf, filename, - ce_stage(ce), fullname.buf, - ce_stage(ce), filename); - } - - if (repo_file_exists(r, filename)) - die(_("path '%s' exists on disk, but not in the index"), filename); - if (is_missing_file_error(errno)) - die(_("path '%s' does not exist (neither on disk nor in the index)"), - filename); - - strbuf_release(&fullname); -} - - -static char *resolve_relative_path(struct repository *r, const char *rel) -{ - if (!starts_with(rel, "./") && !starts_with(rel, "../")) - return NULL; - - if (r != the_repository || !is_inside_work_tree()) - die(_("relative path syntax can't be used outside working tree")); - - /* die() inside prefix_path() if resolved path is outside worktree */ - return prefix_path(startup_info->prefix, - startup_info->prefix ? strlen(startup_info->prefix) : 0, - rel); -} - -static enum get_oid_result get_oid_with_context_1(struct repository *repo, - const char *name, - unsigned flags, - const char *prefix, - struct object_id *oid, - struct object_context *oc) -{ - int ret, bracket_depth; - int namelen = strlen(name); - const char *cp; - int only_to_die = flags & GET_OID_ONLY_TO_DIE; - - if (only_to_die) - flags |= GET_OID_QUIETLY; - - memset(oc, 0, sizeof(*oc)); - oc->mode = S_IFINVALID; - strbuf_init(&oc->symlink_path, 0); - ret = get_oid_1(repo, name, namelen, oid, flags); - if (!ret) - return ret; - /* - * sha1:path --> object name of path in ent sha1 - * :path -> object name of absolute path in index - * :./path -> object name of path relative to cwd in index - * :[0-3]:path -> object name of path in index at stage - * :/foo -> recent commit matching foo - */ - if (name[0] == ':') { - int stage = 0; - const struct cache_entry *ce; - char *new_path = NULL; - int pos; - if (!only_to_die && namelen > 2 && name[1] == '/') { - struct handle_one_ref_cb cb; - struct commit_list *list = NULL; - - cb.repo = repo; - cb.list = &list; - refs_for_each_ref(get_main_ref_store(repo), handle_one_ref, &cb); - refs_head_ref(get_main_ref_store(repo), handle_one_ref, &cb); - commit_list_sort_by_date(&list); - return get_oid_oneline(repo, name + 2, oid, list); - } - if (namelen < 3 || - name[2] != ':' || - name[1] < '0' || '3' < name[1]) - cp = name + 1; - else { - stage = name[1] - '0'; - cp = name + 3; - } - new_path = resolve_relative_path(repo, cp); - if (!new_path) { - namelen = namelen - (cp - name); - } else { - cp = new_path; - namelen = strlen(cp); - } - - if (flags & GET_OID_RECORD_PATH) - oc->path = xstrdup(cp); - - if (!repo->index || !repo->index->cache) - repo_read_index(repo); - pos = index_name_pos(repo->index, cp, namelen); - if (pos < 0) - pos = -pos - 1; - while (pos < repo->index->cache_nr) { - ce = repo->index->cache[pos]; - if (ce_namelen(ce) != namelen || - memcmp(ce->name, cp, namelen)) - break; - if (ce_stage(ce) == stage) { - oidcpy(oid, &ce->oid); - oc->mode = ce->ce_mode; - free(new_path); - return 0; - } - pos++; - } - if (only_to_die && name[1] && name[1] != '/') - diagnose_invalid_index_path(repo, stage, prefix, cp); - free(new_path); - return -1; - } - for (cp = name, bracket_depth = 0; *cp; cp++) { - if (*cp == '{') - bracket_depth++; - else if (bracket_depth && *cp == '}') - bracket_depth--; - else if (!bracket_depth && *cp == ':') - break; - } - if (*cp == ':') { - struct object_id tree_oid; - int len = cp - name; - unsigned sub_flags = flags; - - sub_flags &= ~GET_OID_DISAMBIGUATORS; - sub_flags |= GET_OID_TREEISH; - - if (!get_oid_1(repo, name, len, &tree_oid, sub_flags)) { - const char *filename = cp+1; - char *new_filename = NULL; - - new_filename = resolve_relative_path(repo, filename); - if (new_filename) - filename = new_filename; - if (flags & GET_OID_FOLLOW_SYMLINKS) { - ret = get_tree_entry_follow_symlinks(repo, &tree_oid, - filename, oid, &oc->symlink_path, - &oc->mode); - } else { - ret = get_tree_entry(repo, &tree_oid, filename, oid, - &oc->mode); - if (ret && only_to_die) { - diagnose_invalid_oid_path(repo, prefix, - filename, - &tree_oid, - name, len); - } - } - if (flags & GET_OID_RECORD_PATH) - oc->path = xstrdup(filename); - - free(new_filename); - return ret; - } else { - if (only_to_die) - die(_("invalid object name '%.*s'."), len, name); - } - } - return ret; -} - -/* - * Call this function when you know "name" given by the end user must - * name an object but it doesn't; the function _may_ die with a better - * diagnostic message than "no such object 'name'", e.g. "Path 'doc' does not - * exist in 'HEAD'" when given "HEAD:doc", or it may return in which case - * you have a chance to diagnose the error further. - */ -void maybe_die_on_misspelt_object_name(struct repository *r, - const char *name, - const char *prefix) -{ - struct object_context oc; - struct object_id oid; - get_oid_with_context_1(r, name, GET_OID_ONLY_TO_DIE, - prefix, &oid, &oc); -} - -enum get_oid_result get_oid_with_context(struct repository *repo, - const char *str, - unsigned flags, - struct object_id *oid, - struct object_context *oc) -{ - if (flags & GET_OID_FOLLOW_SYMLINKS && flags & GET_OID_ONLY_TO_DIE) - BUG("incompatible flags for get_sha1_with_context"); - return get_oid_with_context_1(repo, str, flags, NULL, oid, oc); -} |