| #include "cache.h" |
| #include "tag.h" |
| #include "commit.h" |
| #include "tree.h" |
| #include "blob.h" |
| #include "tree-walk.h" |
| #include "refs.h" |
| #include "remote.h" |
| |
| static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *); |
| |
| typedef int (*disambiguate_hint_fn)(const unsigned char *, void *); |
| |
| struct disambiguate_state { |
| disambiguate_hint_fn fn; |
| void *cb_data; |
| unsigned char candidate[20]; |
| 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 unsigned char *current) |
| { |
| if (ds->always_call_fn) { |
| ds->ambiguous = ds->fn(current, ds->cb_data) ? 1 : 0; |
| return; |
| } |
| if (!ds->candidate_exists) { |
| /* this is the first candidate */ |
| hashcpy(ds->candidate, current); |
| ds->candidate_exists = 1; |
| return; |
| } else if (!hashcmp(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->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 */ |
| hashcpy(ds->candidate, current); |
| ds->candidate_checked = 0; |
| return; |
| } |
| |
| /* if we reach this point, we know ds->candidate satisfies fn */ |
| if (ds->fn(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 void find_short_object_filename(int len, const char *hex_pfx, struct disambiguate_state *ds) |
| { |
| struct alternate_object_database *alt; |
| char hex[40]; |
| static struct alternate_object_database *fakeent; |
| |
| if (!fakeent) { |
| /* |
| * Create a "fake" alternate object database that |
| * points to our own object database, to make it |
| * easier to get a temporary working space in |
| * alt->name/alt->base while iterating over the |
| * object databases including our own. |
| */ |
| const char *objdir = get_object_directory(); |
| int objdir_len = strlen(objdir); |
| int entlen = objdir_len + 43; |
| fakeent = xmalloc(sizeof(*fakeent) + entlen); |
| memcpy(fakeent->base, objdir, objdir_len); |
| fakeent->name = fakeent->base + objdir_len + 1; |
| fakeent->name[-1] = '/'; |
| } |
| fakeent->next = alt_odb_list; |
| |
| sprintf(hex, "%.2s", hex_pfx); |
| for (alt = fakeent; alt && !ds->ambiguous; alt = alt->next) { |
| struct dirent *de; |
| DIR *dir; |
| sprintf(alt->name, "%.2s/", hex_pfx); |
| dir = opendir(alt->base); |
| if (!dir) |
| continue; |
| |
| while (!ds->ambiguous && (de = readdir(dir)) != NULL) { |
| unsigned char sha1[20]; |
| |
| if (strlen(de->d_name) != 38) |
| continue; |
| if (memcmp(de->d_name, hex_pfx + 2, len - 2)) |
| continue; |
| memcpy(hex + 2, de->d_name, 38); |
| if (!get_sha1_hex(hex, sha1)) |
| update_candidates(ds, sha1); |
| } |
| closedir(dir); |
| } |
| } |
| |
| 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_pack(int len, |
| const unsigned char *bin_pfx, |
| struct packed_git *p, |
| struct disambiguate_state *ds) |
| { |
| uint32_t num, last, i, first = 0; |
| const unsigned char *current = NULL; |
| |
| open_pack_index(p); |
| num = p->num_objects; |
| last = num; |
| while (first < last) { |
| uint32_t mid = (first + last) / 2; |
| const unsigned char *current; |
| int cmp; |
| |
| current = nth_packed_object_sha1(p, mid); |
| cmp = hashcmp(bin_pfx, current); |
| if (!cmp) { |
| first = mid; |
| break; |
| } |
| if (cmp > 0) { |
| first = mid+1; |
| continue; |
| } |
| last = mid; |
| } |
| |
| /* |
| * 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++) { |
| current = nth_packed_object_sha1(p, i); |
| if (!match_sha(len, bin_pfx, current)) |
| break; |
| update_candidates(ds, current); |
| } |
| } |
| |
| static void find_short_packed_object(int len, const unsigned char *bin_pfx, |
| struct disambiguate_state *ds) |
| { |
| struct packed_git *p; |
| |
| prepare_packed_git(); |
| for (p = packed_git; p && !ds->ambiguous; p = p->next) |
| unique_in_pack(len, bin_pfx, p, ds); |
| } |
| |
| #define SHORT_NAME_NOT_FOUND (-1) |
| #define SHORT_NAME_AMBIGUOUS (-2) |
| |
| static int finish_object_disambiguation(struct disambiguate_state *ds, |
| unsigned char *sha1) |
| { |
| if (ds->ambiguous) |
| return SHORT_NAME_AMBIGUOUS; |
| |
| if (!ds->candidate_exists) |
| return SHORT_NAME_NOT_FOUND; |
| |
| 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->candidate, ds->cb_data)); |
| |
| if (!ds->candidate_ok) |
| return SHORT_NAME_AMBIGUOUS; |
| |
| hashcpy(sha1, ds->candidate); |
| return 0; |
| } |
| |
| static int disambiguate_commit_only(const unsigned char *sha1, void *cb_data_unused) |
| { |
| int kind = sha1_object_info(sha1, NULL); |
| return kind == OBJ_COMMIT; |
| } |
| |
| static int disambiguate_committish_only(const unsigned char *sha1, void *cb_data_unused) |
| { |
| struct object *obj; |
| int kind; |
| |
| kind = sha1_object_info(sha1, NULL); |
| if (kind == OBJ_COMMIT) |
| return 1; |
| if (kind != OBJ_TAG) |
| return 0; |
| |
| /* We need to do this the hard way... */ |
| obj = deref_tag(parse_object(sha1), NULL, 0); |
| if (obj && obj->type == OBJ_COMMIT) |
| return 1; |
| return 0; |
| } |
| |
| static int disambiguate_tree_only(const unsigned char *sha1, void *cb_data_unused) |
| { |
| int kind = sha1_object_info(sha1, NULL); |
| return kind == OBJ_TREE; |
| } |
| |
| static int disambiguate_treeish_only(const unsigned char *sha1, void *cb_data_unused) |
| { |
| struct object *obj; |
| int kind; |
| |
| kind = sha1_object_info(sha1, 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(lookup_object(sha1), NULL, 0); |
| if (obj && (obj->type == OBJ_TREE || obj->type == OBJ_COMMIT)) |
| return 1; |
| return 0; |
| } |
| |
| static int disambiguate_blob_only(const unsigned char *sha1, void *cb_data_unused) |
| { |
| int kind = sha1_object_info(sha1, NULL); |
| return kind == OBJ_BLOB; |
| } |
| |
| static int prepare_prefixes(const char *name, int len, |
| unsigned char *bin_pfx, |
| char *hex_pfx) |
| { |
| int i; |
| |
| hashclr(bin_pfx); |
| memset(hex_pfx, 'x', 40); |
| 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; |
| hex_pfx[i] = c; |
| if (!(i & 1)) |
| val <<= 4; |
| bin_pfx[i >> 1] |= val; |
| } |
| return 0; |
| } |
| |
| static int get_short_sha1(const char *name, int len, unsigned char *sha1, |
| unsigned flags) |
| { |
| int status; |
| char hex_pfx[40]; |
| unsigned char bin_pfx[20]; |
| struct disambiguate_state ds; |
| int quietly = !!(flags & GET_SHA1_QUIETLY); |
| |
| if (len < MINIMUM_ABBREV || len > 40) |
| return -1; |
| if (prepare_prefixes(name, len, bin_pfx, hex_pfx) < 0) |
| return -1; |
| |
| prepare_alt_odb(); |
| |
| memset(&ds, 0, sizeof(ds)); |
| if (flags & GET_SHA1_COMMIT) |
| ds.fn = disambiguate_commit_only; |
| else if (flags & GET_SHA1_COMMITTISH) |
| ds.fn = disambiguate_committish_only; |
| else if (flags & GET_SHA1_TREE) |
| ds.fn = disambiguate_tree_only; |
| else if (flags & GET_SHA1_TREEISH) |
| ds.fn = disambiguate_treeish_only; |
| else if (flags & GET_SHA1_BLOB) |
| ds.fn = disambiguate_blob_only; |
| |
| find_short_object_filename(len, hex_pfx, &ds); |
| find_short_packed_object(len, bin_pfx, &ds); |
| status = finish_object_disambiguation(&ds, sha1); |
| |
| if (!quietly && (status == SHORT_NAME_AMBIGUOUS)) |
| return error("short SHA1 %.*s is ambiguous.", len, hex_pfx); |
| return status; |
| } |
| |
| int for_each_abbrev(const char *prefix, each_abbrev_fn fn, void *cb_data) |
| { |
| char hex_pfx[40]; |
| unsigned char bin_pfx[20]; |
| struct disambiguate_state ds; |
| int len = strlen(prefix); |
| |
| if (len < MINIMUM_ABBREV || len > 40) |
| return -1; |
| if (prepare_prefixes(prefix, len, bin_pfx, hex_pfx) < 0) |
| return -1; |
| |
| prepare_alt_odb(); |
| |
| memset(&ds, 0, sizeof(ds)); |
| ds.always_call_fn = 1; |
| ds.cb_data = cb_data; |
| ds.fn = fn; |
| |
| find_short_object_filename(len, hex_pfx, &ds); |
| find_short_packed_object(len, bin_pfx, &ds); |
| return ds.ambiguous; |
| } |
| |
| const char *find_unique_abbrev(const unsigned char *sha1, int len) |
| { |
| int status, exists; |
| static char hex[41]; |
| |
| exists = has_sha1_file(sha1); |
| memcpy(hex, sha1_to_hex(sha1), 40); |
| if (len == 40 || !len) |
| return hex; |
| while (len < 40) { |
| unsigned char sha1_ret[20]; |
| status = get_short_sha1(hex, len, sha1_ret, GET_SHA1_QUIETLY); |
| if (exists |
| ? !status |
| : status == SHORT_NAME_NOT_FOUND) { |
| hex[len] = 0; |
| return hex; |
| } |
| 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 upstream_mark(const char *string, int len) |
| { |
| const char *suffix[] = { "@{upstream}", "@{u}" }; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(suffix); i++) { |
| int suffix_len = strlen(suffix[i]); |
| if (suffix_len <= len |
| && !memcmp(string, suffix[i], suffix_len)) |
| return suffix_len; |
| } |
| return 0; |
| } |
| |
| static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags); |
| static int interpret_nth_prior_checkout(const char *name, int namelen, struct strbuf *buf); |
| |
| static int get_sha1_basic(const char *str, int len, unsigned char *sha1) |
| { |
| 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 checkout -b $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\""); |
| unsigned char tmp_sha1[20]; |
| char *real_ref = NULL; |
| int refs_found = 0; |
| int at, reflog_len, nth_prior = 0; |
| |
| if (len == 40 && !get_sha1_hex(str, sha1)) { |
| if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) { |
| refs_found = dwim_ref(str, len, tmp_sha1, &real_ref); |
| 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)) { |
| 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(str, len, &buf) > 0) { |
| detached = (buf.len == 40 && !get_sha1_hex(buf.buf, sha1)); |
| strbuf_release(&buf); |
| if (detached) |
| return 0; |
| } |
| } |
| |
| if (!len && reflog_len) |
| /* allow "@{...}" to mean the current branch reflog */ |
| refs_found = dwim_ref("HEAD", 4, sha1, &real_ref); |
| else if (reflog_len) |
| refs_found = dwim_log(str, len, sha1, &real_ref); |
| else |
| refs_found = dwim_ref(str, len, sha1, &real_ref); |
| |
| if (!refs_found) |
| return -1; |
| |
| if (warn_ambiguous_refs && |
| (refs_found > 1 || |
| !get_short_sha1(str, len, tmp_sha1, GET_SHA1_QUIETLY))) |
| warning(warn_msg, len, str); |
| |
| if (reflog_len) { |
| int nth, i; |
| unsigned long at_time; |
| unsigned long 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) |
| return -1; |
| } |
| if (read_ref_at(real_ref, at_time, nth, sha1, NULL, |
| &co_time, &co_tz, &co_cnt)) { |
| if (!len) { |
| if (starts_with(real_ref, "refs/heads/")) { |
| str = real_ref + 11; |
| len = strlen(real_ref + 11); |
| } else { |
| /* detached HEAD */ |
| str = "HEAD"; |
| len = 4; |
| } |
| } |
| if (at_time) |
| warning("Log for '%.*s' only goes " |
| "back to %s.", len, str, |
| show_date(co_time, co_tz, DATE_RFC2822)); |
| else { |
| die("Log for '%.*s' only has %d entries.", |
| len, str, co_cnt); |
| } |
| } |
| } |
| |
| free(real_ref); |
| return 0; |
| } |
| |
| static int get_parent(const char *name, int len, |
| unsigned char *result, int idx) |
| { |
| unsigned char sha1[20]; |
| int ret = get_sha1_1(name, len, sha1, GET_SHA1_COMMITTISH); |
| struct commit *commit; |
| struct commit_list *p; |
| |
| if (ret) |
| return ret; |
| commit = lookup_commit_reference(sha1); |
| if (parse_commit(commit)) |
| return -1; |
| if (!idx) { |
| hashcpy(result, commit->object.sha1); |
| return 0; |
| } |
| p = commit->parents; |
| while (p) { |
| if (!--idx) { |
| hashcpy(result, p->item->object.sha1); |
| return 0; |
| } |
| p = p->next; |
| } |
| return -1; |
| } |
| |
| static int get_nth_ancestor(const char *name, int len, |
| unsigned char *result, int generation) |
| { |
| unsigned char sha1[20]; |
| struct commit *commit; |
| int ret; |
| |
| ret = get_sha1_1(name, len, sha1, GET_SHA1_COMMITTISH); |
| if (ret) |
| return ret; |
| commit = lookup_commit_reference(sha1); |
| if (!commit) |
| return -1; |
| |
| while (generation--) { |
| if (parse_commit(commit) || !commit->parents) |
| return -1; |
| commit = commit->parents->item; |
| } |
| hashcpy(result, commit->object.sha1); |
| return 0; |
| } |
| |
| struct object *peel_to_type(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(o->sha1))) |
| 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 = &(((struct commit *) o)->tree->object); |
| else { |
| if (name) |
| error("%.*s: expected %s type, but the object " |
| "dereferences to %s type", |
| namelen, name, typename(expected_type), |
| typename(o->type)); |
| return NULL; |
| } |
| } |
| } |
| |
| static int peel_onion(const char *name, int len, unsigned char *sha1) |
| { |
| unsigned char outer[20]; |
| const char *sp; |
| unsigned int expected_type = 0; |
| unsigned lookup_flags = 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; |
| |
| if (expected_type == OBJ_COMMIT) |
| lookup_flags = GET_SHA1_COMMITTISH; |
| else if (expected_type == OBJ_TREE) |
| lookup_flags = GET_SHA1_TREEISH; |
| |
| if (get_sha1_1(name, sp - name - 2, outer, lookup_flags)) |
| return -1; |
| |
| o = parse_object(outer); |
| if (!o) |
| return -1; |
| if (!expected_type) { |
| o = deref_tag(o, name, sp - name - 2); |
| if (!o || (!o->parsed && !parse_object(o->sha1))) |
| return -1; |
| hashcpy(sha1, o->sha1); |
| return 0; |
| } |
| |
| /* |
| * At this point, the syntax look correct, so |
| * if we do not get the needed object, we should |
| * barf. |
| */ |
| o = peel_to_type(name, len, o, expected_type); |
| if (!o) |
| return -1; |
| |
| hashcpy(sha1, o->sha1); |
| 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_sha1_oneline(prefix, sha1, list); |
| free(prefix); |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int get_describe_name(const char *name, int len, unsigned char *sha1) |
| { |
| const char *cp; |
| unsigned flags = GET_SHA1_QUIETLY | GET_SHA1_COMMIT; |
| |
| for (cp = name + len - 1; name + 2 <= cp; cp--) { |
| char ch = *cp; |
| if (hexval(ch) & ~0377) { |
| /* 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_sha1(cp, len, sha1, flags); |
| } |
| } |
| } |
| return -1; |
| } |
| |
| static int get_sha1_1(const char *name, int len, unsigned char *sha1, 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) { |
| int num = 0; |
| int len1 = cp - name; |
| cp++; |
| while (cp < name + len) |
| num = num * 10 + *cp++ - '0'; |
| if (!num && len1 == len - 1) |
| num = 1; |
| if (has_suffix == '^') |
| return get_parent(name, len1, sha1, num); |
| /* else if (has_suffix == '~') -- goes without saying */ |
| return get_nth_ancestor(name, len1, sha1, num); |
| } |
| |
| ret = peel_onion(name, len, sha1); |
| if (!ret) |
| return 0; |
| |
| ret = get_sha1_basic(name, len, sha1); |
| if (!ret) |
| return 0; |
| |
| /* It could be describe output that is "SOMETHING-gXXXX" */ |
| ret = get_describe_name(name, len, sha1); |
| if (!ret) |
| return 0; |
| |
| return get_short_sha1(name, len, sha1, 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 future extension, ':/!' is reserved. If you want to match a message |
| * beginning with a '!', you have to repeat the exclamation mark. |
| */ |
| |
| /* Remember to update object flag allocation in object.h */ |
| #define ONELINE_SEEN (1u<<20) |
| |
| static int handle_one_ref(const char *path, |
| const unsigned char *sha1, int flag, void *cb_data) |
| { |
| struct commit_list **list = cb_data; |
| struct object *object = parse_object(sha1); |
| if (!object) |
| return 0; |
| if (object->type == OBJ_TAG) { |
| object = deref_tag(object, path, strlen(path)); |
| if (!object) |
| return 0; |
| } |
| if (object->type != OBJ_COMMIT) |
| return 0; |
| commit_list_insert_by_date((struct commit *)object, list); |
| return 0; |
| } |
| |
| static int get_sha1_oneline(const char *prefix, unsigned char *sha1, |
| struct commit_list *list) |
| { |
| struct commit_list *backup = NULL, *l; |
| int found = 0; |
| regex_t regex; |
| |
| if (prefix[0] == '!') { |
| if (prefix[1] != '!') |
| die ("Invalid search pattern: %s", prefix); |
| prefix++; |
| } |
| |
| if (regcomp(®ex, prefix, REG_EXTENDED)) |
| die("Invalid search pattern: %s", prefix); |
| |
| for (l = list; l; l = l->next) { |
| l->item->object.flags |= ONELINE_SEEN; |
| commit_list_insert(l->item, &backup); |
| } |
| while (list) { |
| char *p, *to_free = NULL; |
| struct commit *commit; |
| enum object_type type; |
| unsigned long size; |
| int matches; |
| |
| commit = pop_most_recent_commit(&list, ONELINE_SEEN); |
| if (!parse_object(commit->object.sha1)) |
| continue; |
| if (commit->buffer) |
| p = commit->buffer; |
| else { |
| p = read_sha1_file(commit->object.sha1, &type, &size); |
| if (!p) |
| continue; |
| to_free = p; |
| } |
| |
| p = strstr(p, "\n\n"); |
| matches = p && !regexec(®ex, p + 2, 0, NULL, 0); |
| free(to_free); |
| |
| if (matches) { |
| hashcpy(sha1, commit->object.sha1); |
| 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 buf; |
| }; |
| |
| static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1, |
| const char *email, unsigned long 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 (starts_with(message, "checkout: moving from ")) { |
| match = message + strlen("checkout: moving from "); |
| target = strstr(match, " to "); |
| } |
| |
| if (!match || !target) |
| return 0; |
| if (--(cb->remaining) == 0) { |
| len = target - match; |
| strbuf_reset(&cb->buf); |
| strbuf_add(&cb->buf, 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(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; |
| strbuf_init(&cb.buf, 20); |
| |
| retval = 0; |
| if (0 < for_each_reflog_ent_reverse("HEAD", grab_nth_branch_switch, &cb)) { |
| strbuf_reset(buf); |
| strbuf_add(buf, cb.buf.buf, cb.buf.len); |
| retval = brace - name + 1; |
| } |
| |
| strbuf_release(&cb.buf); |
| return retval; |
| } |
| |
| int get_sha1_mb(const char *name, unsigned char *sha1) |
| { |
| struct commit *one, *two; |
| struct commit_list *mbs; |
| unsigned char sha1_tmp[20]; |
| const char *dots; |
| int st; |
| |
| dots = strstr(name, "..."); |
| if (!dots) |
| return get_sha1(name, sha1); |
| if (dots == name) |
| st = get_sha1("HEAD", sha1_tmp); |
| else { |
| struct strbuf sb; |
| strbuf_init(&sb, dots - name); |
| strbuf_add(&sb, name, dots - name); |
| st = get_sha1_committish(sb.buf, sha1_tmp); |
| strbuf_release(&sb); |
| } |
| if (st) |
| return st; |
| one = lookup_commit_reference_gently(sha1_tmp, 0); |
| if (!one) |
| return -1; |
| |
| if (get_sha1_committish(dots[3] ? (dots + 3) : "HEAD", sha1_tmp)) |
| return -1; |
| two = lookup_commit_reference_gently(sha1_tmp, 0); |
| if (!two) |
| return -1; |
| mbs = get_merge_bases(one, two, 1); |
| if (!mbs || mbs->next) |
| st = -1; |
| else { |
| st = 0; |
| hashcpy(sha1, mbs->item->object.sha1); |
| } |
| 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(const char *name, int namelen, int len, struct strbuf *buf) |
| { |
| /* we have extra data, which might need further processing */ |
| struct strbuf tmp = STRBUF_INIT; |
| int used = buf->len; |
| int ret; |
| |
| strbuf_add(buf, name + len, namelen - len); |
| ret = interpret_branch_name(buf->buf, buf->len, &tmp); |
| /* 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 strbuf *buf, const char *ref) |
| { |
| char *s = shorten_unambiguous_ref(ref, 0); |
| strbuf_reset(buf); |
| strbuf_addstr(buf, s); |
| free(s); |
| } |
| |
| static const char *get_upstream_branch(const char *branch_buf, int len) |
| { |
| char *branch = xstrndup(branch_buf, len); |
| struct branch *upstream = branch_get(*branch ? branch : NULL); |
| |
| /* |
| * Upstream can be NULL only if branch refers to HEAD and HEAD |
| * points to something different than a branch. |
| */ |
| if (!upstream) |
| die(_("HEAD does not point to a branch")); |
| if (!upstream->merge || !upstream->merge[0]->dst) { |
| if (!ref_exists(upstream->refname)) |
| die(_("No such branch: '%s'"), branch); |
| if (!upstream->merge) { |
| die(_("No upstream configured for branch '%s'"), |
| upstream->name); |
| } |
| die( |
| _("Upstream branch '%s' not stored as a remote-tracking branch"), |
| upstream->merge[0]->src); |
| } |
| free(branch); |
| |
| return upstream->merge[0]->dst; |
| } |
| |
| static int interpret_upstream_mark(const char *name, int namelen, |
| int at, struct strbuf *buf) |
| { |
| int len; |
| |
| len = upstream_mark(name + at, namelen - at); |
| if (!len) |
| return -1; |
| |
| if (memchr(name, ':', at)) |
| return -1; |
| |
| set_shortened_ref(buf, get_upstream_branch(name, at)); |
| return len + at; |
| } |
| |
| /* |
| * This reads short-hand syntax that not only evaluates to a commit |
| * object name, but also can act as if the end user spelled the name |
| * of the branch from the command line. |
| * |
| * - "@{-N}" finds the name of the Nth previous branch we were on, and |
| * places the name of the branch in the given buf and returns the |
| * number of characters parsed if successful. |
| * |
| * - "<branch>@{upstream}" finds the name of the other ref that |
| * <branch> is configured to merge with (missing <branch> defaults |
| * to the current branch), and places the name of the branch in the |
| * given buf and returns the number of characters parsed if |
| * successful. |
| * |
| * If the input is not of the accepted format, it returns a negative |
| * number to signal an error. |
| * |
| * If the input was ok but there are not N branch switches in the |
| * reflog, it returns 0. |
| */ |
| int interpret_branch_name(const char *name, int namelen, struct strbuf *buf) |
| { |
| char *at; |
| const char *start; |
| int len = interpret_nth_prior_checkout(name, namelen, buf); |
| |
| if (!namelen) |
| namelen = strlen(name); |
| |
| if (!len) { |
| return len; /* syntax Ok, not enough switches */ |
| } else if (len > 0) { |
| if (len == namelen) |
| return len; /* consumed all */ |
| else |
| return reinterpret(name, namelen, len, buf); |
| } |
| |
| for (start = name; |
| (at = memchr(start, '@', namelen - (start - name))); |
| start = at + 1) { |
| |
| len = interpret_empty_at(name, namelen, at - name, buf); |
| if (len > 0) |
| return reinterpret(name, namelen, len, buf); |
| |
| len = interpret_upstream_mark(name, namelen, at - name, buf); |
| if (len > 0) |
| return len; |
| } |
| |
| return -1; |
| } |
| |
| int strbuf_branchname(struct strbuf *sb, const char *name) |
| { |
| int len = strlen(name); |
| int used = interpret_branch_name(name, len, sb); |
| |
| if (used == len) |
| return 0; |
| if (used < 0) |
| used = 0; |
| strbuf_add(sb, name + used, len - used); |
| return len; |
| } |
| |
| int strbuf_check_branch_ref(struct strbuf *sb, const char *name) |
| { |
| strbuf_branchname(sb, name); |
| if (name[0] == '-') |
| return -1; |
| strbuf_splice(sb, 0, 0, "refs/heads/", 11); |
| return check_refname_format(sb->buf, 0); |
| } |
| |
| /* |
| * This is like "get_sha1_basic()", except it allows "sha1 expressions", |
| * notably "xyz^" for "parent of xyz" |
| */ |
| int get_sha1(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, 0, sha1, &unused); |
| } |
| |
| /* |
| * 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 get_sha1_committish(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, GET_SHA1_COMMITTISH, |
| sha1, &unused); |
| } |
| |
| int get_sha1_treeish(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, GET_SHA1_TREEISH, |
| sha1, &unused); |
| } |
| |
| int get_sha1_commit(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, GET_SHA1_COMMIT, |
| sha1, &unused); |
| } |
| |
| int get_sha1_tree(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, GET_SHA1_TREE, |
| sha1, &unused); |
| } |
| |
| int get_sha1_blob(const char *name, unsigned char *sha1) |
| { |
| struct object_context unused; |
| return get_sha1_with_context(name, GET_SHA1_BLOB, |
| sha1, &unused); |
| } |
| |
| /* Must be called only when object_name:filename doesn't exist. */ |
| static void diagnose_invalid_sha1_path(const char *prefix, |
| const char *filename, |
| const unsigned char *tree_sha1, |
| const char *object_name, |
| int object_name_len) |
| { |
| struct stat st; |
| unsigned char sha1[20]; |
| unsigned mode; |
| |
| if (!prefix) |
| prefix = ""; |
| |
| if (!lstat(filename, &st)) |
| die("Path '%s' exists on disk, but not in '%.*s'.", |
| filename, object_name_len, object_name); |
| if (errno == ENOENT || errno == ENOTDIR) { |
| char *fullname = xmalloc(strlen(filename) |
| + strlen(prefix) + 1); |
| strcpy(fullname, prefix); |
| strcat(fullname, filename); |
| |
| if (!get_tree_entry(tree_sha1, fullname, |
| sha1, &mode)) { |
| die("Path '%s' exists, but not '%s'.\n" |
| "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(int stage, |
| const char *prefix, |
| const char *filename) |
| { |
| struct stat st; |
| const struct cache_entry *ce; |
| int pos; |
| unsigned namelen = strlen(filename); |
| unsigned fullnamelen; |
| char *fullname; |
| |
| if (!prefix) |
| prefix = ""; |
| |
| /* Wrong stage number? */ |
| pos = cache_name_pos(filename, namelen); |
| if (pos < 0) |
| pos = -pos - 1; |
| if (pos < active_nr) { |
| ce = active_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" |
| "Did you mean ':%d:%s'?", |
| filename, stage, |
| ce_stage(ce), filename); |
| } |
| |
| /* Confusion between relative and absolute filenames? */ |
| fullnamelen = namelen + strlen(prefix); |
| fullname = xmalloc(fullnamelen + 1); |
| strcpy(fullname, prefix); |
| strcat(fullname, filename); |
| pos = cache_name_pos(fullname, fullnamelen); |
| if (pos < 0) |
| pos = -pos - 1; |
| if (pos < active_nr) { |
| ce = active_cache[pos]; |
| if (ce_namelen(ce) == fullnamelen && |
| !memcmp(ce->name, fullname, fullnamelen)) |
| die("Path '%s' is in the index, but not '%s'.\n" |
| "Did you mean ':%d:%s' aka ':%d:./%s'?", |
| fullname, filename, |
| ce_stage(ce), fullname, |
| ce_stage(ce), filename); |
| } |
| |
| if (!lstat(filename, &st)) |
| die("Path '%s' exists on disk, but not in the index.", filename); |
| if (errno == ENOENT || errno == ENOTDIR) |
| die("Path '%s' does not exist (neither on disk nor in the index).", |
| filename); |
| |
| free(fullname); |
| } |
| |
| |
| static char *resolve_relative_path(const char *rel) |
| { |
| if (!starts_with(rel, "./") && !starts_with(rel, "../")) |
| return NULL; |
| |
| if (!startup_info) |
| die("BUG: startup_info struct is not initialized."); |
| |
| if (!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 int get_sha1_with_context_1(const char *name, |
| unsigned flags, |
| const char *prefix, |
| unsigned char *sha1, |
| struct object_context *oc) |
| { |
| int ret, bracket_depth; |
| int namelen = strlen(name); |
| const char *cp; |
| int only_to_die = flags & GET_SHA1_ONLY_TO_DIE; |
| |
| memset(oc, 0, sizeof(*oc)); |
| oc->mode = S_IFINVALID; |
| ret = get_sha1_1(name, namelen, sha1, 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 commit_list *list = NULL; |
| for_each_ref(handle_one_ref, &list); |
| return get_sha1_oneline(name + 2, sha1, 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(cp); |
| if (!new_path) { |
| namelen = namelen - (cp - name); |
| } else { |
| cp = new_path; |
| namelen = strlen(cp); |
| } |
| |
| strncpy(oc->path, cp, |
| sizeof(oc->path)); |
| oc->path[sizeof(oc->path)-1] = '\0'; |
| |
| if (!active_cache) |
| read_cache(); |
| pos = cache_name_pos(cp, namelen); |
| if (pos < 0) |
| pos = -pos - 1; |
| while (pos < active_nr) { |
| ce = active_cache[pos]; |
| if (ce_namelen(ce) != namelen || |
| memcmp(ce->name, cp, namelen)) |
| break; |
| if (ce_stage(ce) == stage) { |
| hashcpy(sha1, ce->sha1); |
| oc->mode = ce->ce_mode; |
| free(new_path); |
| return 0; |
| } |
| pos++; |
| } |
| if (only_to_die && name[1] && name[1] != '/') |
| diagnose_invalid_index_path(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 == ':') { |
| unsigned char tree_sha1[20]; |
| int len = cp - name; |
| if (!get_sha1_1(name, len, tree_sha1, GET_SHA1_TREEISH)) { |
| const char *filename = cp+1; |
| char *new_filename = NULL; |
| |
| new_filename = resolve_relative_path(filename); |
| if (new_filename) |
| filename = new_filename; |
| ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode); |
| if (ret && only_to_die) { |
| diagnose_invalid_sha1_path(prefix, filename, |
| tree_sha1, |
| name, len); |
| } |
| hashcpy(oc->tree, tree_sha1); |
| strncpy(oc->path, filename, |
| sizeof(oc->path)); |
| oc->path[sizeof(oc->path)-1] = '\0'; |
| |
| 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(const char *name, const char *prefix) |
| { |
| struct object_context oc; |
| unsigned char sha1[20]; |
| get_sha1_with_context_1(name, GET_SHA1_ONLY_TO_DIE, prefix, sha1, &oc); |
| } |
| |
| int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc) |
| { |
| return get_sha1_with_context_1(str, flags, NULL, sha1, orc); |
| } |