diff options
Diffstat (limited to 'refs.c')
| -rw-r--r-- | refs.c | 393 |
1 files changed, 267 insertions, 126 deletions
@@ -637,7 +637,7 @@ static int do_one_ref(struct ref_entry *entry, void *cb_data) struct ref_entry *old_current_ref; int retval; - if (prefixcmp(entry->name, data->base)) + if (!starts_with(entry->name, data->base)) return 0; if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) && @@ -1042,7 +1042,7 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir) if (refname) { last = create_ref_entry(refname, sha1, REF_ISPACKED, 1); if (peeled == PEELED_FULLY || - (peeled == PEELED_TAGS && !prefixcmp(refname, "refs/tags/"))) + (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) last->flag |= REF_KNOWS_PEELED; add_ref(dir, last); continue; @@ -1222,7 +1222,7 @@ static int resolve_gitlink_packed_ref(struct ref_cache *refs, if (ref == NULL) return -1; - memcpy(sha1, ref->u.value.sha1, 20); + hashcpy(sha1, ref->u.value.sha1); return 0; } @@ -1376,7 +1376,7 @@ const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int rea return NULL; } buffer[len] = 0; - if (!prefixcmp(buffer, "refs/") && + if (starts_with(buffer, "refs/") && !check_refname_format(buffer, 0)) { strcpy(refname_buffer, buffer); refname = refname_buffer; @@ -1415,7 +1415,7 @@ const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int rea /* * Is it a symbolic ref? */ - if (prefixcmp(buffer, "ref:")) { + if (!starts_with(buffer, "ref:")) { /* * Please note that FETCH_HEAD has a second * line containing other data. @@ -1477,7 +1477,7 @@ static int filter_refs(const char *refname, const unsigned char *sha1, int flags void *data) { struct ref_filter *filter = (struct ref_filter *)data; - if (fnmatch(filter->pattern, refname, 0)) + if (wildmatch(filter->pattern, refname, 0, NULL)) return 0; return filter->fn(refname, sha1, flags, filter->cb_data); } @@ -1837,7 +1837,7 @@ int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, struct ref_filter filter; int ret; - if (!prefix && prefixcmp(pattern, "refs/")) + if (!prefix && !starts_with(pattern, "refs/")) strbuf_addstr(&real_pattern, "refs/"); else if (prefix) strbuf_addstr(&real_pattern, prefix); @@ -1874,13 +1874,13 @@ int for_each_rawref(each_ref_fn fn, void *cb_data) const char *prettify_refname(const char *name) { return name + ( - !prefixcmp(name, "refs/heads/") ? 11 : - !prefixcmp(name, "refs/tags/") ? 10 : - !prefixcmp(name, "refs/remotes/") ? 13 : + starts_with(name, "refs/heads/") ? 11 : + starts_with(name, "refs/tags/") ? 10 : + starts_with(name, "refs/remotes/") ? 13 : 0); } -const char *ref_rev_parse_rules[] = { +static const char *ref_rev_parse_rules[] = { "%.*s", "refs/%.*s", "refs/tags/%.*s", @@ -1890,12 +1890,12 @@ const char *ref_rev_parse_rules[] = { NULL }; -int refname_match(const char *abbrev_name, const char *full_name, const char **rules) +int refname_match(const char *abbrev_name, const char *full_name) { const char **p; const int abbrev_name_len = strlen(abbrev_name); - for (p = rules; *p; p++) { + for (p = ref_rev_parse_rules; *p; p++) { if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { return 1; } @@ -1999,7 +1999,6 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log) *log = NULL; for (p = ref_rev_parse_rules; *p; p++) { - struct stat st; unsigned char hash[20]; char path[PATH_MAX]; const char *ref, *it; @@ -2008,12 +2007,9 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log) ref = resolve_ref_unsafe(path, hash, 1, NULL); if (!ref) continue; - if (!stat(git_path("logs/%s", path), &st) && - S_ISREG(st.st_mode)) + if (reflog_exists(path)) it = path; - else if (strcmp(ref, path) && - !stat(git_path("logs/%s", ref), &st) && - S_ISREG(st.st_mode)) + else if (strcmp(ref, path) && reflog_exists(ref)) it = ref; else continue; @@ -2039,6 +2035,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, int type, lflags; int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); int missing = 0; + int attempts_remaining = 3; lock = xcalloc(1, sizeof(struct ref_lock)); lock->lock_fd = -1; @@ -2080,7 +2077,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, lock->lk = xcalloc(1, sizeof(struct lock_file)); - lflags = LOCK_DIE_ON_ERROR; + lflags = 0; if (flags & REF_NODEREF) { refname = orig_refname; lflags |= LOCK_NODEREF; @@ -2093,13 +2090,32 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname, if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) lock->force_write = 1; - if (safe_create_leading_directories(ref_file)) { + retry: + switch (safe_create_leading_directories(ref_file)) { + case SCLD_OK: + break; /* success */ + case SCLD_VANISHED: + if (--attempts_remaining > 0) + goto retry; + /* fall through */ + default: last_errno = errno; error("unable to create directory for %s", ref_file); goto error_return; } lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); + if (lock->lock_fd < 0) { + if (errno == ENOENT && --attempts_remaining > 0) + /* + * Maybe somebody just deleted one of the + * directories leading to ref_file. Try + * again: + */ + goto retry; + else + unable_to_lock_index_die(ref_file, errno); + } return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; error_return: @@ -2244,7 +2260,7 @@ static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) struct pack_refs_cb_data *cb = cb_data; enum peel_status peel_status; struct ref_entry *packed_entry; - int is_tag_ref = !prefixcmp(entry->name, "refs/tags/"); + int is_tag_ref = starts_with(entry->name, "refs/tags/"); /* ALWAYS pack tags */ if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) @@ -2508,6 +2524,51 @@ int delete_ref(const char *refname, const unsigned char *sha1, int delopt) */ #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" +static int rename_tmp_log(const char *newrefname) +{ + int attempts_remaining = 4; + + retry: + switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) { + case SCLD_OK: + break; /* success */ + case SCLD_VANISHED: + if (--attempts_remaining > 0) + goto retry; + /* fall through */ + default: + error("unable to create directory for %s", newrefname); + return -1; + } + + if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { + if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) { + /* + * rename(a, b) when b is an existing + * directory ought to result in ISDIR, but + * Solaris 5.8 gives ENOTDIR. Sheesh. + */ + if (remove_empty_directories(git_path("logs/%s", newrefname))) { + error("Directory not empty: logs/%s", newrefname); + return -1; + } + goto retry; + } else if (errno == ENOENT && --attempts_remaining > 0) { + /* + * Maybe another process just deleted one of + * the directories in the path to newrefname. + * Try again from the beginning. + */ + goto retry; + } else { + error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", + newrefname, strerror(errno)); + return -1; + } + } + return 0; +} + int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) { unsigned char sha1[20], orig_sha1[20]; @@ -2555,30 +2616,9 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms } } - if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) { - error("unable to create directory for %s", newrefname); + if (log && rename_tmp_log(newrefname)) goto rollback; - } - retry: - if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { - if (errno==EISDIR || errno==ENOTDIR) { - /* - * rename(a, b) when b is an existing - * directory ought to result in ISDIR, but - * Solaris 5.8 gives ENOTDIR. Sheesh. - */ - if (remove_empty_directories(git_path("logs/%s", newrefname))) { - error("Directory not empty: logs/%s", newrefname); - goto rollback; - } - goto retry; - } else { - error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", - newrefname, strerror(errno)); - goto rollback; - } - } logmoved = log; lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); @@ -2679,9 +2719,9 @@ int log_ref_setup(const char *refname, char *logfile, int bufsize) git_snpath(logfile, bufsize, "logs/%s", refname); if (log_all_ref_updates && - (!prefixcmp(refname, "refs/heads/") || - !prefixcmp(refname, "refs/remotes/") || - !prefixcmp(refname, "refs/notes/") || + (starts_with(refname, "refs/heads/") || + starts_with(refname, "refs/remotes/") || + starts_with(refname, "refs/notes/") || !strcmp(refname, "HEAD"))) { if (safe_create_leading_directories(logfile) < 0) return error("unable to create directory for %s", @@ -2751,7 +2791,7 @@ static int log_ref_write(const char *refname, const unsigned char *old_sha1, static int is_branch(const char *refname) { - return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); + return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); } int write_ref_sha1(struct ref_lock *lock, @@ -3002,6 +3042,19 @@ int read_ref_at(const char *refname, unsigned long at_time, int cnt, return 1; } +int reflog_exists(const char *refname) +{ + struct stat st; + + return !lstat(git_path("logs/%s", refname), &st) && + S_ISREG(st.st_mode); +} + +int delete_reflog(const char *refname) +{ + return remove_path(git_path("logs/%s", refname)); +} + static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) { unsigned char osha1[20], nsha1[20]; @@ -3199,9 +3252,9 @@ static struct ref_lock *update_ref_lock(const char *refname, if (!lock) { const char *str = "Cannot lock the ref '%s'."; switch (onerr) { - case MSG_ON_ERR: error(str, refname); break; - case DIE_ON_ERR: die(str, refname); break; - case QUIET_ON_ERR: break; + case UPDATE_REFS_MSG_ON_ERR: error(str, refname); break; + case UPDATE_REFS_DIE_ON_ERR: die(str, refname); break; + case UPDATE_REFS_QUIET_ON_ERR: break; } } return lock; @@ -3214,15 +3267,118 @@ static int update_ref_write(const char *action, const char *refname, if (write_ref_sha1(lock, sha1, action) < 0) { const char *str = "Cannot update the ref '%s'."; switch (onerr) { - case MSG_ON_ERR: error(str, refname); break; - case DIE_ON_ERR: die(str, refname); break; - case QUIET_ON_ERR: break; + case UPDATE_REFS_MSG_ON_ERR: error(str, refname); break; + case UPDATE_REFS_DIE_ON_ERR: die(str, refname); break; + case UPDATE_REFS_QUIET_ON_ERR: break; } return 1; } return 0; } +/** + * Information needed for a single ref update. Set new_sha1 to the + * new value or to zero to delete the ref. To check the old value + * while locking the ref, set have_old to 1 and set old_sha1 to the + * value or to zero to ensure the ref does not exist before update. + */ +struct ref_update { + unsigned char new_sha1[20]; + unsigned char old_sha1[20]; + int flags; /* REF_NODEREF? */ + int have_old; /* 1 if old_sha1 is valid, 0 otherwise */ + struct ref_lock *lock; + int type; + const char refname[FLEX_ARRAY]; +}; + +/* + * Data structure for holding a reference transaction, which can + * consist of checks and updates to multiple references, carried out + * as atomically as possible. This structure is opaque to callers. + */ +struct ref_transaction { + struct ref_update **updates; + size_t alloc; + size_t nr; +}; + +struct ref_transaction *ref_transaction_begin(void) +{ + return xcalloc(1, sizeof(struct ref_transaction)); +} + +static void ref_transaction_free(struct ref_transaction *transaction) +{ + int i; + + for (i = 0; i < transaction->nr; i++) + free(transaction->updates[i]); + + free(transaction->updates); + free(transaction); +} + +void ref_transaction_rollback(struct ref_transaction *transaction) +{ + ref_transaction_free(transaction); +} + +static struct ref_update *add_update(struct ref_transaction *transaction, + const char *refname) +{ + size_t len = strlen(refname); + struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1); + + strcpy((char *)update->refname, refname); + ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc); + transaction->updates[transaction->nr++] = update; + return update; +} + +void ref_transaction_update(struct ref_transaction *transaction, + const char *refname, + unsigned char *new_sha1, unsigned char *old_sha1, + int flags, int have_old) +{ + struct ref_update *update = add_update(transaction, refname); + + hashcpy(update->new_sha1, new_sha1); + update->flags = flags; + update->have_old = have_old; + if (have_old) + hashcpy(update->old_sha1, old_sha1); +} + +void ref_transaction_create(struct ref_transaction *transaction, + const char *refname, + unsigned char *new_sha1, + int flags) +{ + struct ref_update *update = add_update(transaction, refname); + + assert(!is_null_sha1(new_sha1)); + hashcpy(update->new_sha1, new_sha1); + hashclr(update->old_sha1); + update->flags = flags; + update->have_old = 1; +} + +void ref_transaction_delete(struct ref_transaction *transaction, + const char *refname, + unsigned char *old_sha1, + int flags, int have_old) +{ + struct ref_update *update = add_update(transaction, refname); + + update->flags = flags; + update->have_old = have_old; + if (have_old) { + assert(!is_null_sha1(old_sha1)); + hashcpy(update->old_sha1, old_sha1); + } +} + int update_ref(const char *action, const char *refname, const unsigned char *sha1, const unsigned char *oldval, int flags, enum action_on_err onerr) @@ -3238,7 +3394,7 @@ static int ref_update_compare(const void *r1, const void *r2) { const struct ref_update * const *u1 = r1; const struct ref_update * const *u2 = r2; - return strcmp((*u1)->ref_name, (*u2)->ref_name); + return strcmp((*u1)->refname, (*u2)->refname); } static int ref_update_reject_duplicates(struct ref_update **updates, int n, @@ -3246,15 +3402,15 @@ static int ref_update_reject_duplicates(struct ref_update **updates, int n, { int i; for (i = 1; i < n; i++) - if (!strcmp(updates[i - 1]->ref_name, updates[i]->ref_name)) { + if (!strcmp(updates[i - 1]->refname, updates[i]->refname)) { const char *str = "Multiple updates for ref '%s' not allowed."; switch (onerr) { - case MSG_ON_ERR: - error(str, updates[i]->ref_name); break; - case DIE_ON_ERR: - die(str, updates[i]->ref_name); break; - case QUIET_ON_ERR: + case UPDATE_REFS_MSG_ON_ERR: + error(str, updates[i]->refname); break; + case UPDATE_REFS_DIE_ON_ERR: + die(str, updates[i]->refname); break; + case UPDATE_REFS_QUIET_ON_ERR: break; } return 1; @@ -3262,26 +3418,21 @@ static int ref_update_reject_duplicates(struct ref_update **updates, int n, return 0; } -int update_refs(const char *action, const struct ref_update **updates_orig, - int n, enum action_on_err onerr) +int ref_transaction_commit(struct ref_transaction *transaction, + const char *msg, enum action_on_err onerr) { int ret = 0, delnum = 0, i; - struct ref_update **updates; - int *types; - struct ref_lock **locks; const char **delnames; + int n = transaction->nr; + struct ref_update **updates = transaction->updates; - if (!updates_orig || !n) + if (!n) return 0; /* Allocate work space */ - updates = xmalloc(sizeof(*updates) * n); - types = xmalloc(sizeof(*types) * n); - locks = xcalloc(n, sizeof(*locks)); delnames = xmalloc(sizeof(*delnames) * n); /* Copy, sort, and reject duplicate refs */ - memcpy(updates, updates_orig, sizeof(*updates) * n); qsort(updates, n, sizeof(*updates), ref_update_compare); ret = ref_update_reject_duplicates(updates, n, onerr); if (ret) @@ -3289,35 +3440,44 @@ int update_refs(const char *action, const struct ref_update **updates_orig, /* Acquire all locks while verifying old values */ for (i = 0; i < n; i++) { - locks[i] = update_ref_lock(updates[i]->ref_name, - (updates[i]->have_old ? - updates[i]->old_sha1 : NULL), - updates[i]->flags, - &types[i], onerr); - if (!locks[i]) { + struct ref_update *update = updates[i]; + + update->lock = update_ref_lock(update->refname, + (update->have_old ? + update->old_sha1 : NULL), + update->flags, + &update->type, onerr); + if (!update->lock) { ret = 1; goto cleanup; } } /* Perform updates first so live commits remain referenced */ - for (i = 0; i < n; i++) - if (!is_null_sha1(updates[i]->new_sha1)) { - ret = update_ref_write(action, - updates[i]->ref_name, - updates[i]->new_sha1, - locks[i], onerr); - locks[i] = NULL; /* freed by update_ref_write */ + for (i = 0; i < n; i++) { + struct ref_update *update = updates[i]; + + if (!is_null_sha1(update->new_sha1)) { + ret = update_ref_write(msg, + update->refname, + update->new_sha1, + update->lock, onerr); + update->lock = NULL; /* freed by update_ref_write */ if (ret) goto cleanup; } + } /* Perform deletes now that updates are safely completed */ - for (i = 0; i < n; i++) - if (locks[i]) { - delnames[delnum++] = locks[i]->ref_name; - ret |= delete_ref_loose(locks[i], types[i]); + for (i = 0; i < n; i++) { + struct ref_update *update = updates[i]; + + if (update->lock) { + delnames[delnum++] = update->lock->ref_name; + ret |= delete_ref_loose(update->lock, update->type); } + } + ret |= repack_without_refs(delnames, delnum); for (i = 0; i < delnum; i++) unlink_or_warn(git_path("logs/%s", delnames[i])); @@ -3325,38 +3485,13 @@ int update_refs(const char *action, const struct ref_update **updates_orig, cleanup: for (i = 0; i < n; i++) - if (locks[i]) - unlock_ref(locks[i]); - free(updates); - free(types); - free(locks); + if (updates[i]->lock) + unlock_ref(updates[i]->lock); free(delnames); + ref_transaction_free(transaction); return ret; } -/* - * generate a format suitable for scanf from a ref_rev_parse_rules - * rule, that is replace the "%.*s" spec with a "%s" spec - */ -static void gen_scanf_fmt(char *scanf_fmt, const char *rule) -{ - char *spec; - - spec = strstr(rule, "%.*s"); - if (!spec || strstr(spec + 4, "%.*s")) - die("invalid rule in ref_rev_parse_rules: %s", rule); - - /* copy all until spec */ - strncpy(scanf_fmt, rule, spec - rule); - scanf_fmt[spec - rule] = '\0'; - /* copy new spec */ - strcat(scanf_fmt, "%s"); - /* copy remaining rule */ - strcat(scanf_fmt, spec + 4); - - return; -} - char *shorten_unambiguous_ref(const char *refname, int strict) { int i; @@ -3364,23 +3499,29 @@ char *shorten_unambiguous_ref(const char *refname, int strict) static int nr_rules; char *short_name; - /* pre generate scanf formats from ref_rev_parse_rules[] */ if (!nr_rules) { + /* + * Pre-generate scanf formats from ref_rev_parse_rules[]. + * Generate a format suitable for scanf from a + * ref_rev_parse_rules rule by interpolating "%s" at the + * location of the "%.*s". + */ size_t total_len = 0; + size_t offset = 0; /* the rule list is NULL terminated, count them first */ for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) - /* no +1 because strlen("%s") < strlen("%.*s") */ - total_len += strlen(ref_rev_parse_rules[nr_rules]); + /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ + total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); - total_len = 0; + offset = 0; for (i = 0; i < nr_rules; i++) { - scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] - + total_len; - gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); - total_len += strlen(ref_rev_parse_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; } } @@ -3450,7 +3591,7 @@ int parse_hide_refs_config(const char *var, const char *value, const char *secti { if (!strcmp("transfer.hiderefs", var) || /* NEEDSWORK: use parse_config_key() once both are merged */ - (!prefixcmp(var, section) && var[strlen(section)] == '.' && + (starts_with(var, section) && var[strlen(section)] == '.' && !strcmp(var + strlen(section), ".hiderefs"))) { char *ref; int len; @@ -3478,7 +3619,7 @@ int ref_is_hidden(const char *refname) return 0; for_each_string_list_item(item, hide_refs) { int len; - if (prefixcmp(refname, item->string)) + if (!starts_with(refname, item->string)) continue; len = strlen(item->string); if (!refname[len] || refname[len] == '/') |