diff options
Diffstat (limited to 'refs.c')
| -rw-r--r-- | refs.c | 1525 |
1 files changed, 1309 insertions, 216 deletions
@@ -3,11 +3,38 @@ */ #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: @@ -120,33 +147,71 @@ int check_refname_format(const char *refname, int flags) int refname_is_safe(const char *refname) { - if (starts_with(refname, "refs/")) { + 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; - buf = xmallocz(strlen(refname)); /* * Does the refname try to escape refs/? * For example: refs/foo/../bar is safe but refs/foo/../../bar * is not. */ - result = !normalize_path_copy(buf, refname + strlen("refs/")); + buf = xmallocz(restlen); + result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest); free(buf); return result; } - while (*refname) { + + 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_sha1_file(oid->hash)) { + 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, - unsigned char *sha1, int *flags) + struct object_id *oid, int *flags) { - return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags, - sha1, flags)); + return refs_resolve_refdup(get_main_ref_store(the_repository), + refname, resolve_flags, + oid, flags); } /* The argument to filter_refs */ @@ -156,22 +221,72 @@ struct ref_filter { void *cb_data; }; -int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags) +int refs_read_ref_full(struct ref_store *refs, const char *refname, + int resolve_flags, struct object_id *oid, int *flags) { - if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags)) + if (refs_resolve_ref_unsafe(refs, refname, resolve_flags, oid, flags)) return 0; return -1; } -int read_ref(const char *refname, unsigned char *sha1) +int read_ref_full(const char *refname, int resolve_flags, struct object_id *oid, int *flags) { - return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL); + 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); } int ref_exists(const char *refname) { - unsigned char sha1[20]; - return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL); + return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, NULL, NULL); +} + +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, @@ -179,18 +294,18 @@ static int filter_refs(const char *refname, const struct object_id *oid, { struct ref_filter *filter = (struct ref_filter *)data; - if (wildmatch(filter->pattern, refname, 0, NULL)) + if (wildmatch(filter->pattern, refname, 0)) return 0; return filter->fn(refname, oid, flags, filter->cb_data); } -enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) +enum peel_status peel_object(const struct object_id *name, struct object_id *oid) { - struct object *o = lookup_unknown_object(name); + struct object *o = lookup_unknown_object(name->hash); if (o->type == OBJ_NONE) { - int type = sha1_object_info(name, NULL); - if (type < 0 || !object_as_type(o, type, 0)) + int type = oid_object_info(the_repository, name, NULL); + if (type < 0 || !object_as_type(the_repository, o, type, 0)) return PEEL_INVALID; } @@ -201,7 +316,7 @@ enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) if (!o) return PEEL_INVALID; - hashcpy(sha1, o->oid.hash); + oidcpy(oid, &o->oid); return PEEL_PEELED; } @@ -217,12 +332,11 @@ static int warn_if_dangling_symref(const char *refname, const struct object_id * { struct warn_if_dangling_data *d = cb_data; const char *resolves_to; - struct object_id junk; if (!(flags & REF_ISSYMREF)) return 0; - resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL); + resolves_to = resolve_ref_unsafe(refname, 0, NULL, NULL); if (!resolves_to || (d->refname ? strcmp(resolves_to, d->refname) @@ -257,34 +371,34 @@ void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_li for_each_rawref(warn_if_dangling_symref, &data); } -int for_each_tag_ref(each_ref_fn fn, void *cb_data) +int refs_for_each_tag_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) { - return for_each_ref_in("refs/tags/", fn, cb_data); + return refs_for_each_ref_in(refs, "refs/tags/", fn, cb_data); } -int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) +int for_each_tag_ref(each_ref_fn fn, void *cb_data) { - return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); + return refs_for_each_tag_ref(get_main_ref_store(the_repository), fn, cb_data); } -int for_each_branch_ref(each_ref_fn fn, void *cb_data) +int refs_for_each_branch_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) { - return for_each_ref_in("refs/heads/", fn, cb_data); + return refs_for_each_ref_in(refs, "refs/heads/", fn, cb_data); } -int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) +int for_each_branch_ref(each_ref_fn fn, void *cb_data) { - return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); + return refs_for_each_branch_ref(get_main_ref_store(the_repository), fn, cb_data); } -int for_each_remote_ref(each_ref_fn fn, void *cb_data) +int refs_for_each_remote_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data) { - return for_each_ref_in("refs/remotes/", fn, cb_data); + return refs_for_each_ref_in(refs, "refs/remotes/", fn, cb_data); } -int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) +int for_each_remote_ref(each_ref_fn fn, void *cb_data) { - return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, 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) @@ -295,13 +409,34 @@ int head_ref_namespaced(each_ref_fn fn, void *cb_data) int flag; strbuf_addf(&buf, "%sHEAD", get_git_namespace()); - if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag)) + 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) { @@ -338,11 +473,11 @@ int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) const char *prettify_refname(const char *name) { - return name + ( - starts_with(name, "refs/heads/") ? 11 : - starts_with(name, "refs/tags/") ? 10 : - starts_with(name, "refs/remotes/") ? 13 : - 0); + 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[] = { @@ -355,21 +490,42 @@ static const char *ref_rev_parse_rules[] = { 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 1; - } - } + 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. @@ -377,7 +533,7 @@ int refname_match(const char *abbrev_name, const char *full_name) static char *substitute_branch_name(const char **string, int *len) { struct strbuf buf = STRBUF_INIT; - int ret = interpret_branch_name(*string, *len, &buf); + int ret = interpret_branch_name(*string, *len, &buf, 0); if (ret == *len) { size_t size; @@ -389,68 +545,78 @@ static char *substitute_branch_name(const char **string, int *len) return NULL; } -int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) +int dwim_ref(const char *str, int len, struct object_id *oid, char **ref) { char *last_branch = substitute_branch_name(&str, &len); + int refs_found = expand_ref(str, len, oid, ref); + free(last_branch); + return refs_found; +} + +int expand_ref(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++) { - char fullref[PATH_MAX]; - unsigned char sha1_from_ref[20]; - unsigned char *this_result; + struct object_id oid_from_ref; + struct object_id *this_result; int flag; - this_result = refs_found ? sha1_from_ref : sha1; - mksnpath(fullref, sizeof(fullref), *p, len, str); - r = resolve_ref_unsafe(fullref, RESOLVE_REF_READING, + this_result = refs_found ? &oid_from_ref : oid; + strbuf_reset(&fullref); + strbuf_addf(&fullref, *p, len, str); + r = resolve_ref_unsafe(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, "HEAD")) { - warning("ignoring dangling symref %s.", fullref); - } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { - warning("ignoring broken ref %s.", fullref); + } 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); } } - free(last_branch); + strbuf_release(&fullref); return refs_found; } -int dwim_log(const char *str, int len, unsigned char *sha1, char **log) +int dwim_log(const char *str, int len, struct object_id *oid, char **log) { char *last_branch = substitute_branch_name(&str, &len); const char **p; int logs_found = 0; + struct strbuf path = STRBUF_INIT; *log = NULL; for (p = ref_rev_parse_rules; *p; p++) { - unsigned char hash[20]; - char path[PATH_MAX]; + struct object_id hash; const char *ref, *it; - mksnpath(path, sizeof(path), *p, len, str); - ref = resolve_ref_unsafe(path, RESOLVE_REF_READING, - hash, NULL); + strbuf_reset(&path); + strbuf_addf(&path, *p, len, str); + ref = resolve_ref_unsafe(path.buf, RESOLVE_REF_READING, + &hash, NULL); if (!ref) continue; - if (reflog_exists(path)) - it = path; - else if (strcmp(ref, path) && reflog_exists(ref)) + if (reflog_exists(path.buf)) + it = path.buf; + else if (strcmp(ref, path.buf) && reflog_exists(ref)) it = ref; else continue; if (!logs_found++) { *log = xstrdup(it); - hashcpy(sha1, hash); + oidcpy(oid, &hash); } if (!warn_ambiguous_refs) break; } + strbuf_release(&path); free(last_branch); return logs_found; } @@ -458,7 +624,8 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log) static int is_per_worktree_ref(const char *refname) { return !strcmp(refname, "HEAD") || - starts_with(refname, "refs/bisect/"); + starts_with(refname, "refs/bisect/") || + starts_with(refname, "refs/rewritten/"); } static int is_pseudoref_syntax(const char *refname) @@ -482,39 +649,69 @@ enum ref_type ref_type(const char *refname) return REF_TYPE_NORMAL; } -static int write_pseudoref(const char *pseudoref, const unsigned char *sha1, - const unsigned char *old_sha1, struct strbuf *err) +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; - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; struct strbuf buf = STRBUF_INIT; int ret = -1; - strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1)); + if (!oid) + return 0; + + strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); filename = git_path("%s", pseudoref); - fd = hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR); + 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", + strbuf_addf(err, _("could not open '%s' for writing: %s"), filename, strerror(errno)); - return -1; + goto done; } - if (old_sha1) { - unsigned char actual_old_sha1[20]; - - if (read_ref(pseudoref, actual_old_sha1)) - die("could not read ref '%s'", pseudoref); - if (hashcmp(actual_old_sha1, old_sha1)) { - strbuf_addf(err, "Unexpected sha1 when writing %s", pseudoref); + 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 (oidcmp(&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) != buf.len) { - strbuf_addf(err, "Could not write to '%s'", filename); + 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; } @@ -526,25 +723,30 @@ done: return ret; } -static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1) +static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid) { - static struct lock_file lock; const char *filename; filename = git_path("%s", pseudoref); - if (old_sha1 && !is_null_sha1(old_sha1)) { + if (old_oid && !is_null_oid(old_oid)) { + struct lock_file lock = LOCK_INIT; int fd; - unsigned char actual_old_sha1[20]; - - fd = hold_lock_file_for_update(&lock, filename, - LOCK_DIE_ON_ERROR); - if (fd < 0) - die_errno(_("Could not open '%s' for writing"), filename); - if (read_ref(pseudoref, actual_old_sha1)) - die("could not read ref '%s'", pseudoref); - if (hashcmp(actual_old_sha1, old_sha1)) { - warning("Unexpected sha1 when deleting %s", pseudoref); + 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 (oidcmp(&actual_old_oid, old_oid)) { + error(_("unexpected object ID when deleting '%s'"), + pseudoref); rollback_lock_file(&lock); return -1; } @@ -558,19 +760,23 @@ static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1 return 0; } -int delete_ref(const char *refname, const unsigned char *old_sha1, - unsigned int flags) +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) - return delete_pseudoref(refname, old_sha1); + if (ref_type(refname) == REF_TYPE_PSEUDOREF) { + assert(refs == get_main_ref_store(the_repository)); + return delete_pseudoref(refname, old_oid); + } - transaction = ref_transaction_begin(&err); + transaction = ref_store_transaction_begin(refs, &err); if (!transaction || - ref_transaction_delete(transaction, refname, old_sha1, - flags, NULL, &err) || + ref_transaction_delete(transaction, refname, old_oid, + flags, msg, &err) || ref_transaction_commit(transaction, &err)) { error("%s", err.buf); ref_transaction_free(transaction); @@ -582,35 +788,43 @@ int delete_ref(const char *refname, const unsigned char *old_sha1, return 0; } -int copy_reflog_msg(char *buf, const char *msg) +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 *cp = buf; char c; int wasspace = 1; - *cp++ = '\t'; + strbuf_addch(sb, '\t'); while ((c = *msg++)) { if (wasspace && isspace(c)) continue; wasspace = isspace(c); if (wasspace) c = ' '; - *cp++ = c; + strbuf_addch(sb, c); } - while (buf < cp && isspace(cp[-1])) - cp--; - *cp++ = '\n'; - return cp - buf; + strbuf_rtrim(sb); } int should_autocreate_reflog(const char *refname) { - if (!log_all_ref_updates) + 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; - return starts_with(refname, "refs/heads/") || - starts_with(refname, "refs/remotes/") || - starts_with(refname, "refs/notes/") || - !strcmp(refname, "HEAD"); + } } int is_branch(const char *refname) @@ -620,24 +834,24 @@ int is_branch(const char *refname) struct read_ref_at_cb { const char *refname; - unsigned long at_time; + timestamp_t at_time; int cnt; int reccnt; - unsigned char *sha1; + struct object_id *oid; int found_it; - unsigned char osha1[20]; - unsigned char nsha1[20]; + struct object_id ooid; + struct object_id noid; int tz; - unsigned long date; + timestamp_t date; char **msg; - unsigned long *cutoff_time; + timestamp_t *cutoff_time; int *cutoff_tz; int *cutoff_cnt; }; -static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1, - const char *email, unsigned long timestamp, int tz, +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; @@ -656,35 +870,35 @@ static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1, if (cb->cutoff_cnt) *cb->cutoff_cnt = cb->reccnt - 1; /* - * we have not yet updated cb->[n|o]sha1 so they still + * we have not yet updated cb->[n|o]oid so they still * hold the values for the previous record. */ - if (!is_null_sha1(cb->osha1)) { - hashcpy(cb->sha1, nsha1); - if (hashcmp(cb->osha1, nsha1)) - warning("Log for ref %s has gap after %s.", + if (!is_null_oid(&cb->ooid)) { + oidcpy(cb->oid, noid); + if (oidcmp(&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) - hashcpy(cb->sha1, nsha1); - else if (hashcmp(nsha1, cb->sha1)) - warning("Log for ref %s unexpectedly ended on %s.", + oidcpy(cb->oid, noid); + else if (oidcmp(noid, cb->oid)) + warning(_("log for ref %s unexpectedly ended on %s"), cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822))); - hashcpy(cb->osha1, osha1); - hashcpy(cb->nsha1, nsha1); + oidcpy(&cb->ooid, ooid); + oidcpy(&cb->noid, noid); cb->found_it = 1; return 1; } - hashcpy(cb->osha1, osha1); - hashcpy(cb->nsha1, nsha1); + oidcpy(&cb->ooid, ooid); + oidcpy(&cb->noid, noid); if (cb->cnt > 0) cb->cnt--; return 0; } -static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1, - const char *email, unsigned long timestamp, +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; @@ -697,16 +911,16 @@ static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1, *cb->cutoff_tz = tz; if (cb->cutoff_cnt) *cb->cutoff_cnt = cb->reccnt; - hashcpy(cb->sha1, osha1); - if (is_null_sha1(cb->sha1)) - hashcpy(cb->sha1, nsha1); + 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(const char *refname, unsigned int flags, unsigned long at_time, int cnt, - unsigned char *sha1, char **msg, - unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) +int read_ref_at(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; @@ -718,15 +932,15 @@ int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, cb.cutoff_time = cutoff_time; cb.cutoff_tz = cutoff_tz; cb.cutoff_cnt = cutoff_cnt; - cb.sha1 = sha1; + cb.oid = oid; for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb); if (!cb.reccnt) { - if (flags & GET_SHA1_QUIETLY) + if (flags & GET_OID_QUIETLY) exit(128); else - die("Log for %s is empty.", refname); + die(_("log for %s is empty"), refname); } if (cb.found_it) return 0; @@ -736,20 +950,42 @@ int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, return 1; } -struct ref_transaction *ref_transaction_begin(struct strbuf *err) +struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs, + struct strbuf *err) { + struct ref_transaction *tr; assert(err); - return xcalloc(1, sizeof(struct ref_transaction)); + 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) { - int i; + 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]); @@ -758,104 +994,113 @@ void ref_transaction_free(struct ref_transaction *transaction) free(transaction); } -static struct ref_update *add_update(struct ref_transaction *transaction, - const char *refname) +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 unsigned char *new_sha1, - const unsigned char *old_sha1, + const struct object_id *new_oid, + const struct object_id *old_oid, unsigned int flags, const char *msg, struct strbuf *err) { - struct ref_update *update; - assert(err); - if (transaction->state != REF_TRANSACTION_OPEN) - die("BUG: update called for transaction that is not open"); - - if (new_sha1 && !is_null_sha1(new_sha1) && - check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { - strbuf_addf(err, "refusing to update ref with bad name %s", + 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; } - update = add_update(transaction, refname); - if (new_sha1) { - hashcpy(update->new_sha1, new_sha1); - flags |= REF_HAVE_NEW; - } - if (old_sha1) { - hashcpy(update->old_sha1, old_sha1); - flags |= REF_HAVE_OLD; - } - update->flags = flags; - if (msg) - update->msg = xstrdup(msg); + 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 unsigned char *new_sha1, + const struct object_id *new_oid, unsigned int flags, const char *msg, struct strbuf *err) { - if (!new_sha1 || is_null_sha1(new_sha1)) - die("BUG: create called without valid new_sha1"); - return ref_transaction_update(transaction, refname, new_sha1, - null_sha1, flags, msg, 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 unsigned char *old_sha1, + const struct object_id *old_oid, unsigned int flags, const char *msg, struct strbuf *err) { - if (old_sha1 && is_null_sha1(old_sha1)) - die("BUG: delete called with old_sha1 set to zeros"); + if (old_oid && is_null_oid(old_oid)) + BUG("delete called with old_oid set to zeros"); return ref_transaction_update(transaction, refname, - null_sha1, old_sha1, + &null_oid, old_oid, flags, msg, err); } int ref_transaction_verify(struct ref_transaction *transaction, const char *refname, - const unsigned char *old_sha1, + const struct object_id *old_oid, unsigned int flags, struct strbuf *err) { - if (!old_sha1) - die("BUG: verify called with old_sha1 set to NULL"); + if (!old_oid) + BUG("verify called with old_oid set to NULL"); return ref_transaction_update(transaction, refname, - NULL, old_sha1, + NULL, old_oid, flags, NULL, err); } -int update_ref(const char *msg, const char *refname, - const unsigned char *new_sha1, const unsigned char *old_sha1, - unsigned int flags, enum action_on_err onerr) +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) { - ret = write_pseudoref(refname, new_sha1, old_sha1, &err); + assert(refs == get_main_ref_store(the_repository)); + ret = write_pseudoref(refname, new_oid, old_oid, &err); } else { - t = ref_transaction_begin(&err); + t = ref_store_transaction_begin(refs, &err); if (!t || - ref_transaction_update(t, refname, new_sha1, old_sha1, + ref_transaction_update(t, refname, new_oid, old_oid, flags, msg, &err) || ref_transaction_commit(t, &err)) { ret = 1; @@ -863,7 +1108,7 @@ int update_ref(const char *msg, const char *refname, } } if (ret) { - const char *str = "update_ref failed for ref '%s': %s"; + const char *str = _("update_ref failed for ref '%s': %s"); switch (onerr) { case UPDATE_REFS_MSG_ON_ERR: @@ -884,12 +1129,22 @@ int update_ref(const char *msg, const char *refname, 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 *shorten_unambiguous_ref(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) { /* @@ -906,14 +1161,14 @@ char *shorten_unambiguous_ref(const char *refname, int strict) /* -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(nr_rules, sizeof(char *)), total_len)); + 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 += snprintf(scanf_fmts[i], total_len - offset, - ref_rev_parse_rules[i], 2, "%s") + 1; + offset += xsnprintf(scanf_fmts[i], total_len - offset, + ref_rev_parse_rules[i], 2, "%s") + 1; } } @@ -948,7 +1203,6 @@ char *shorten_unambiguous_ref(const char *refname, int strict) */ for (j = 0; j < rules_to_fail; j++) { const char *rule = ref_rev_parse_rules[j]; - char refname[PATH_MAX]; /* skip matched rule */ if (i == j) @@ -959,9 +1213,10 @@ char *shorten_unambiguous_ref(const char *refname, int strict) * (with this previous rule) to a valid ref * read_ref() returns 0 on success */ - mksnpath(refname, sizeof(refname), - rule, short_name_len, short_name); - if (ref_exists(refname)) + strbuf_reset(&resolved_buf); + strbuf_addf(&resolved_buf, rule, + short_name_len, short_name); + if (ref_exists(resolved_buf.buf)) break; } @@ -969,10 +1224,13 @@ char *shorten_unambiguous_ref(const char *refname, int strict) * short name is non-ambiguous if all previous rules * haven't resolved to a valid ref */ - if (j == rules_to_fail) + if (j == rules_to_fail) { + strbuf_release(&resolved_buf); return short_name; + } } + strbuf_release(&resolved_buf); free(short_name); return xstrdup(refname); } @@ -981,10 +1239,10 @@ 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) || - /* NEEDSWORK: use parse_config_key() once both are merged */ - (starts_with(var, section) && var[strlen(section)] == '.' && - !strcmp(var + strlen(section), ".hiderefs"))) { + (!parse_config_key(var, section, NULL, NULL, &key) && + !strcmp(key, "hiderefs"))) { char *ref; int len; @@ -1013,7 +1271,7 @@ int ref_is_hidden(const char *refname, const char *refname_full) const char *match = hide_refs->items[i].string; const char *subject; int neg = 0; - int len; + const char *p; if (*match == '!') { neg = 1; @@ -1028,10 +1286,9 @@ int ref_is_hidden(const char *refname, const char *refname_full) } /* refname can be NULL when namespaces are used. */ - if (!subject || !starts_with(subject, match)) - continue; - len = strlen(match); - if (!subject[len] || subject[len] == '/') + if (subject && + skip_prefix(subject, match, &p) && + (!*p || *p == '/')) return !neg; } return 0; @@ -1065,18 +1322,854 @@ const char *find_descendant_ref(const char *dirname, return NULL; } -int rename_ref_available(const char *oldname, const char *newname) +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 ret; + int ok; - string_list_insert(&skip, oldname); - ret = !verify_refname_available(newname, NULL, &skip, &err); - if (!ret) + 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_ref(struct ref_store *refs, const char *prefix, + each_ref_fn fn, int trim, int flags, void *cb_data) +{ + struct ref_iterator *iter; + + if (!refs) + return 0; + + iter = refs_ref_iterator_begin(refs, prefix, trim, flags); + + return do_for_each_ref_iterator(iter, fn, cb_data); +} + +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_ref_fn fn, void *cb_data) +{ + return do_for_each_ref(get_main_ref_store(r), + git_replace_ref_base, fn, + strlen(git_replace_ref_base), + DO_FOR_EACH_INCLUDE_BROKEN, cb_data); +} + +int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) +{ + struct strbuf buf = STRBUF_INIT; + int ret; + strbuf_addf(&buf, "%srefs/", get_git_namespace()); + ret = do_for_each_ref(get_main_ref_store(the_repository), + buf.buf, fn, 0, 0, cb_data); + strbuf_release(&buf); + return ret; +} + +int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data) +{ + return do_for_each_ref(refs, "", fn, 0, + DO_FOR_EACH_INCLUDE_BROKEN, cb_data); +} + +int for_each_rawref(each_ref_fn fn, void *cb_data) +{ + return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data); +} + +int refs_read_raw_ref(struct ref_store *ref_store, + const char *refname, struct object_id *oid, + struct strbuf *referent, unsigned int *type) +{ + return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type); +} + +/* This function needs to return a meaningful errno on failure */ +const char *refs_resolve_ref_unsafe(struct ref_store *refs, + const char *refname, + int resolve_flags, + struct object_id *oid, int *flags) +{ + static struct strbuf sb_refname = STRBUF_INIT; + struct object_id unused_oid; + int unused_flags; + int symref_count; + + if (!oid) + oid = &unused_oid; + if (!flags) + flags = &unused_flags; + + *flags = 0; + + if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { + if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || + !refname_is_safe(refname)) { + errno = EINVAL; + return NULL; + } + + /* + * dwim_ref() uses REF_ISBROKEN to distinguish between + * missing refs and refs that were present but invalid, + * to complain about the latter to stderr. + * + * We don't know whether the ref exists, so don't set + * REF_ISBROKEN yet. + */ + *flags |= REF_BAD_NAME; + } + + for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) { + unsigned int read_flags = 0; + + if (refs_read_raw_ref(refs, refname, + oid, &sb_refname, &read_flags)) { + *flags |= read_flags; + + /* In reading mode, refs must eventually resolve */ + if (resolve_flags & RESOLVE_REF_READING) + return NULL; + + /* + * Otherwise a missing ref is OK. But the files backend + * may show errors besides ENOENT if there are + * similarly-named refs. + */ + if (errno != ENOENT && + errno != EISDIR && + errno != ENOTDIR) + return NULL; + + oidclr(oid); + if (*flags & REF_BAD_NAME) + *flags |= REF_ISBROKEN; + return refname; + } + + *flags |= read_flags; + + if (!(read_flags & REF_ISSYMREF)) { + if (*flags & REF_BAD_NAME) { + oidclr(oid); + *flags |= REF_ISBROKEN; + } + return refname; + } + + refname = sb_refname.buf; + if (resolve_flags & RESOLVE_REF_NO_RECURSE) { + oidclr(oid); + return refname; + } + if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { + if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || + !refname_is_safe(refname)) { + errno = EINVAL; + return NULL; + } + + *flags |= REF_ISBROKEN | REF_BAD_NAME; + } + } + + errno = ELOOP; + return NULL; +} + +/* backend functions */ +int refs_init_db(struct strbuf *err) +{ + struct ref_store *refs = get_main_ref_store(the_repository); + + return refs->be->init_db(refs, err); +} + +const char *resolve_ref_unsafe(const char *refname, int resolve_flags, + struct object_id *oid, int *flags) +{ + return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname, + resolve_flags, oid, flags); +} + +int resolve_gitlink_ref(const char *submodule, const char *refname, + struct object_id *oid) +{ + struct ref_store *refs; + int flags; + + refs = get_submodule_ref_store(submodule); + + if (!refs) + return -1; + + if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags) || + is_null_oid(oid)) + return -1; + return 0; +} + +struct ref_store_hash_entry +{ + struct hashmap_entry ent; /* must be the first member! */ + + struct ref_store *refs; + + /* NUL-terminated identifier of the ref store: */ + char name[FLEX_ARRAY]; +}; + +static int ref_store_hash_cmp(const void *unused_cmp_data, + const void *entry, const void *entry_or_key, + const void *keydata) +{ + const struct ref_store_hash_entry *e1 = entry, *e2 = entry_or_key; + const char *name = keydata ? keydata : e2->name; + + return strcmp(e1->name, name); +} + +static struct ref_store_hash_entry *alloc_ref_store_hash_entry( + const char *name, struct ref_store *refs) +{ + struct ref_store_hash_entry *entry; + + FLEX_ALLOC_STR(entry, name, name); + hashmap_entry_init(entry, strhash(name)); + entry->refs = refs; + return entry; +} + +/* A hashmap of ref_stores, stored by submodule name: */ +static struct hashmap submodule_ref_stores; + +/* A hashmap of ref_stores, stored by worktree id: */ +static struct hashmap worktree_ref_stores; + +/* + * Look up a ref store by name. If that ref_store hasn't been + * registered yet, return NULL. + */ +static struct ref_store *lookup_ref_store_map(struct hashmap *map, + const char *name) +{ + struct ref_store_hash_entry *entry; + + if (!map->tablesize) + /* It's initialized on demand in register_ref_store(). */ + return NULL; + + entry = hashmap_get_from_hash(map, strhash(name), name); + return entry ? entry->refs : NULL; +} + +/* + * Create, record, and return a ref_store instance for the specified + * gitdir. + */ +static struct ref_store *ref_store_init(const char *gitdir, + unsigned int flags) +{ + const char *be_name = "files"; + struct ref_storage_be *be = find_ref_storage_backend(be_name); + struct ref_store *refs; + + if (!be) + BUG("reference backend %s is unknown", be_name); + + refs = be->init(gitdir, flags); + return refs; +} + +struct ref_store *get_main_ref_store(struct repository *r) +{ + if (r->refs) + return r->refs; + + if (!r->gitdir) + BUG("attempting to get main_ref_store outside of repository"); + + r->refs = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS); + return r->refs; +} + +/* + * Associate a ref store with a name. It is a fatal error to call this + * function twice for the same name. + */ +static void register_ref_store_map(struct hashmap *map, + const char *type, + struct ref_store *refs, + const char *name) +{ + if (!map->tablesize) + hashmap_init(map, ref_store_hash_cmp, NULL, 0); + + if (hashmap_put(map, alloc_ref_store_hash_entry(name, refs))) + BUG("%s ref_store '%s' initialized twice", type, name); +} + +struct ref_store *get_submodule_ref_store(const char *submodule) +{ + struct strbuf submodule_sb = STRBUF_INIT; + struct ref_store *refs; + char *to_free = NULL; + size_t len; + + if (!submodule) + return NULL; + + len = strlen(submodule); + while (len && is_dir_sep(submodule[len - 1])) + len--; + if (!len) + return NULL; + + if (submodule[len]) + /* We need to strip off one or more trailing slashes */ + submodule = to_free = xmemdupz(submodule, len); + + refs = lookup_ref_store_map(&submodule_ref_stores, submodule); + if (refs) + goto done; + + strbuf_addstr(&submodule_sb, submodule); + if (!is_nonbare_repository_dir(&submodule_sb)) + goto done; + + if (submodule_to_gitdir(&submodule_sb, submodule)) + goto done; + + /* assume that add_submodule_odb() has been called */ + refs = ref_store_init(submodule_sb.buf, + REF_STORE_READ | REF_STORE_ODB); + register_ref_store_map(&submodule_ref_stores, "submodule", + refs, submodule); + +done: + strbuf_release(&submodule_sb); + free(to_free); + + return refs; +} + +struct ref_store *get_worktree_ref_store(const struct worktree *wt) +{ + struct ref_store *refs; + const char *id; + + if (wt->is_current) + return get_main_ref_store(the_repository); + + id = wt->id ? wt->id : "/"; + refs = lookup_ref_store_map(&worktree_ref_stores, id); + if (refs) + return refs; + + if (wt->id) + refs = ref_store_init(git_common_path("worktrees/%s", wt->id), + REF_STORE_ALL_CAPS); + else + refs = ref_store_init(get_git_common_dir(), + REF_STORE_ALL_CAPS); + + if (refs) + register_ref_store_map(&worktree_ref_stores, "worktree", + refs, id); + return refs; +} + +void base_ref_store_init(struct ref_store *refs, + const struct ref_storage_be *be) +{ + refs->be = be; +} + +/* backend functions */ +int refs_pack_refs(struct ref_store *refs, unsigned int flags) +{ + return refs->be->pack_refs(refs, flags); +} + +int refs_peel_ref(struct ref_store *refs, const char *refname, + struct object_id *oid) +{ + int flag; + struct object_id base; + + if (current_ref_iter && current_ref_iter->refname == refname) { + struct object_id peeled; + + if (ref_iterator_peel(current_ref_iter, &peeled)) + return -1; + oidcpy(oid, &peeled); + return 0; + } + + if (refs_read_ref_full(refs, refname, + RESOLVE_REF_READING, &base, &flag)) + return -1; + + return peel_object(&base, oid); +} + +int peel_ref(const char *refname, struct object_id *oid) +{ + return refs_peel_ref(get_main_ref_store(the_repository), refname, oid); +} + +int refs_create_symref(struct ref_store *refs, + const char *ref_target, + const char *refs_heads_master, + const char *logmsg) +{ + return refs->be->create_symref(refs, ref_target, + refs_heads_master, + logmsg); +} + +int create_symref(const char *ref_target, const char *refs_heads_master, + const char *logmsg) +{ + return refs_create_symref(get_main_ref_store(the_repository), ref_target, + refs_heads_master, logmsg); +} + +int ref_update_reject_duplicates(struct string_list *refnames, + struct strbuf *err) +{ + size_t i, n = refnames->nr; + + assert(err); + + for (i = 1; i < n; i++) { + int cmp = strcmp(refnames->items[i - 1].string, + refnames->items[i].string); + + if (!cmp) { + strbuf_addf(err, + _("multiple updates for ref '%s' not allowed"), + refnames->items[i].string); + return 1; + } else if (cmp > 0) { + BUG("ref_update_reject_duplicates() received unsorted list"); + } + } + return 0; +} + +int ref_transaction_prepare(struct ref_transaction *transaction, + struct strbuf *err) +{ + struct ref_store *refs = transaction->ref_store; + + switch (transaction->state) { + case REF_TRANSACTION_OPEN: + /* Good. */ + break; + case REF_TRANSACTION_PREPARED: + BUG("prepare called twice on reference transaction"); + break; + case REF_TRANSACTION_CLOSED: + BUG("prepare called on a closed reference transaction"); + break; + default: + BUG("unexpected reference transaction state"); + break; + } + + if (getenv(GIT_QUARANTINE_ENVIRONMENT)) { + strbuf_addstr(err, + _("ref updates forbidden inside quarantine environment")); + return -1; + } + + return refs->be->transaction_prepare(refs, transaction, err); +} + +int ref_transaction_abort(struct ref_transaction *transaction, + struct strbuf *err) +{ + struct ref_store *refs = transaction->ref_store; + int ret = 0; + + switch (transaction->state) { + case REF_TRANSACTION_OPEN: + /* No need to abort explicitly. */ + break; + case REF_TRANSACTION_PREPARED: + ret = refs->be->transaction_abort(refs, transaction, err); + break; + case REF_TRANSACTION_CLOSED: + BUG("abort called on a closed reference transaction"); + break; + default: + BUG("unexpected reference transaction state"); + break; + } + + ref_transaction_free(transaction); + return ret; +} + +int ref_transaction_commit(struct ref_transaction *transaction, + struct strbuf *err) +{ + struct ref_store *refs = transaction->ref_store; + int ret; + + switch (transaction->state) { + case REF_TRANSACTION_OPEN: + /* Need to prepare first. */ + ret = ref_transaction_prepare(transaction, err); + if (ret) + return ret; + break; + case REF_TRANSACTION_PREPARED: + /* Fall through to finish. */ + break; + case REF_TRANSACTION_CLOSED: + BUG("commit called on a closed reference transaction"); + break; + default: + BUG("unexpected reference transaction state"); + break; + } + + return refs->be->transaction_finish(refs, transaction, err); +} + +int refs_verify_refname_available(struct ref_store *refs, + const char *refname, + const struct string_list *extras, + const struct string_list *skip, + struct strbuf *err) +{ + const char *slash; + const char *extra_refname; + struct strbuf dirname = STRBUF_INIT; + struct strbuf referent = STRBUF_INIT; + struct object_id oid; + unsigned int type; + struct ref_iterator *iter; + int ok; + int ret = -1; + + /* + * For the sake of comments in this function, suppose that + * refname is "refs/foo/bar". + */ + + assert(err); + + strbuf_grow(&dirname, strlen(refname) + 1); + for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { + /* Expand dirname to the new prefix, not including the trailing slash: */ + strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len); + + /* + * We are still at a leading dir of the refname (e.g., + * "refs/foo"; if there is a reference with that name, + * it is a conflict, *unless* it is in skip. + */ + if (skip && string_list_has_string(skip, dirname.buf)) + continue; + + if (!refs_read_raw_ref(refs, dirname.buf, &oid, &referent, &type)) { + strbuf_addf(err, _("'%s' exists; cannot create '%s'"), + dirname.buf, refname); + goto cleanup; + } + + if (extras && string_list_has_string(extras, dirname.buf)) { + strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"), + refname, dirname.buf); + goto cleanup; + } + } + + /* + * We are at the leaf of our refname (e.g., "refs/foo/bar"). + * There is no point in searching for a reference with that + * name, because a refname isn't considered to conflict with + * itself. But we still need to check for references whose + * names are in the "refs/foo/bar/" namespace, because they + * *do* conflict. + */ + strbuf_addstr(&dirname, refname + dirname.len); + strbuf_addch(&dirname, '/'); + + iter = refs_ref_iterator_begin(refs, dirname.buf, 0, + DO_FOR_EACH_INCLUDE_BROKEN); + while ((ok = ref_iterator_advance(iter)) == ITER_OK) { + if (skip && + string_list_has_string(skip, iter->refname)) + continue; + + strbuf_addf(err, _("'%s' exists; cannot create '%s'"), + iter->refname, refname); + ref_iterator_abort(iter); + goto cleanup; + } + + if (ok != ITER_DONE) + BUG("error while iterating over references"); + + extra_refname = find_descendant_ref(dirname.buf, extras, skip); + if (extra_refname) + strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"), + refname, extra_refname); + else + ret = 0; + +cleanup: + strbuf_release(&referent); + strbuf_release(&dirname); return ret; } + +int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data) +{ + struct ref_iterator *iter; + + iter = refs->be->reflog_iterator_begin(refs); + + return do_for_each_ref_iterator(iter, fn, cb_data); +} + +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); +} |