diff options
Diffstat (limited to 'refs.c')
| -rw-r--r-- | refs.c | 205 |
1 files changed, 171 insertions, 34 deletions
@@ -72,6 +72,10 @@ int check_refname_format(const char *refname, int flags) { int component_len, component_count = 0; + if (!strcmp(refname, "@")) + /* Refname is a single character '@'. */ + return -1; + while (1) { /* We are at the start of a path component. */ component_len = check_refname_component(refname, flags); @@ -1951,7 +1955,7 @@ static int remove_empty_directories(const char *file) static char *substitute_branch_name(const char **string, int *len) { struct strbuf buf = STRBUF_INIT; - int ret = interpret_branch_name(*string, &buf); + int ret = interpret_branch_name(*string, *len, &buf); if (ret == *len) { size_t size; @@ -2121,11 +2125,12 @@ struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha } struct ref_lock *lock_any_ref_for_update(const char *refname, - const unsigned char *old_sha1, int flags) + const unsigned char *old_sha1, + int flags, int *type_p) { if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) return NULL; - return lock_ref_sha1_basic(refname, old_sha1, flags, NULL); + return lock_ref_sha1_basic(refname, old_sha1, flags, type_p); } /* @@ -2413,60 +2418,82 @@ static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data) return 0; } -static int repack_without_ref(const char *refname) +static int repack_without_refs(const char **refnames, int n) { struct ref_dir *packed; struct string_list refs_to_delete = STRING_LIST_INIT_DUP; struct string_list_item *ref_to_delete; + int i, removed = 0; + + /* Look for a packed ref */ + for (i = 0; i < n; i++) + if (get_packed_ref(refnames[i])) + break; - if (!get_packed_ref(refname)) - return 0; /* refname does not exist in packed refs */ + /* Avoid locking if we have nothing to do */ + if (i == n) + return 0; /* no refname exists in packed refs */ if (lock_packed_refs(0)) { unable_to_lock_error(git_path("packed-refs"), errno); - return error("cannot delete '%s' from packed refs", refname); + return error("cannot delete '%s' from packed refs", refnames[i]); } packed = get_packed_refs(&ref_cache); - /* Remove refname from the cache: */ - if (remove_entry(packed, refname) == -1) { + /* Remove refnames from the cache */ + for (i = 0; i < n; i++) + if (remove_entry(packed, refnames[i]) != -1) + removed = 1; + if (!removed) { /* - * The packed entry disappeared while we were + * All packed entries disappeared while we were * acquiring the lock. */ rollback_packed_refs(); return 0; } - /* Remove any other accumulated cruft: */ + /* Remove any other accumulated cruft */ do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete); for_each_string_list_item(ref_to_delete, &refs_to_delete) { if (remove_entry(packed, ref_to_delete->string) == -1) die("internal error"); } - /* Write what remains: */ + /* Write what remains */ return commit_packed_refs(); } -int delete_ref(const char *refname, const unsigned char *sha1, int delopt) +static int repack_without_ref(const char *refname) { - struct ref_lock *lock; - int err, i = 0, ret = 0, flag = 0; + return repack_without_refs(&refname, 1); +} - lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag); - if (!lock) - return 1; +static int delete_ref_loose(struct ref_lock *lock, int flag) +{ if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { /* loose */ - i = strlen(lock->lk->filename) - 5; /* .lock */ + int err, i = strlen(lock->lk->filename) - 5; /* .lock */ + lock->lk->filename[i] = 0; err = unlink_or_warn(lock->lk->filename); - if (err && errno != ENOENT) - ret = 1; - lock->lk->filename[i] = '.'; + if (err && errno != ENOENT) + return 1; } + return 0; +} + +int delete_ref(const char *refname, const unsigned char *sha1, int delopt) +{ + struct ref_lock *lock; + int ret = 0, flag = 0; + + lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag); + if (!lock) + return 1; + ret |= delete_ref_loose(lock, flag); + /* removing the loose one could have resurrected an earlier * packed one. Also, if it was not loose we need to repack * without it. @@ -3169,12 +3196,13 @@ int for_each_reflog(each_ref_fn fn, void *cb_data) return retval; } -int update_ref(const char *action, const char *refname, - const unsigned char *sha1, const unsigned char *oldval, - int flags, enum action_on_err onerr) +static struct ref_lock *update_ref_lock(const char *refname, + const unsigned char *oldval, + int flags, int *type_p, + enum action_on_err onerr) { - static struct ref_lock *lock; - lock = lock_any_ref_for_update(refname, oldval, flags); + struct ref_lock *lock; + lock = lock_any_ref_for_update(refname, oldval, flags, type_p); if (!lock) { const char *str = "Cannot lock the ref '%s'."; switch (onerr) { @@ -3182,8 +3210,14 @@ int update_ref(const char *action, const char *refname, case DIE_ON_ERR: die(str, refname); break; case QUIET_ON_ERR: break; } - return 1; } + return lock; +} + +static int update_ref_write(const char *action, const char *refname, + const unsigned char *sha1, struct ref_lock *lock, + enum action_on_err onerr) +{ if (write_ref_sha1(lock, sha1, action) < 0) { const char *str = "Cannot update the ref '%s'."; switch (onerr) { @@ -3196,12 +3230,115 @@ int update_ref(const char *action, const char *refname, return 0; } -struct ref *find_ref_by_name(const struct ref *list, const char *name) +int update_ref(const char *action, const char *refname, + const unsigned char *sha1, const unsigned char *oldval, + int flags, enum action_on_err onerr) { - for ( ; list; list = list->next) - if (!strcmp(list->name, name)) - return (struct ref *)list; - return NULL; + struct ref_lock *lock; + lock = update_ref_lock(refname, oldval, flags, NULL, onerr); + if (!lock) + return 1; + return update_ref_write(action, refname, sha1, lock, onerr); +} + +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); +} + +static int ref_update_reject_duplicates(struct ref_update **updates, int n, + enum action_on_err onerr) +{ + int i; + for (i = 1; i < n; i++) + if (!strcmp(updates[i - 1]->ref_name, updates[i]->ref_name)) { + 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: + break; + } + return 1; + } + return 0; +} + +int update_refs(const char *action, const struct ref_update **updates_orig, + int n, enum action_on_err onerr) +{ + int ret = 0, delnum = 0, i; + struct ref_update **updates; + int *types; + struct ref_lock **locks; + const char **delnames; + + if (!updates_orig || !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) + goto cleanup; + + /* 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]) { + 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 */ + 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]); + } + ret |= repack_without_refs(delnames, delnum); + for (i = 0; i < delnum; i++) + unlink_or_warn(git_path("logs/%s", delnames[i])); + clear_loose_ref_cache(&ref_cache); + +cleanup: + for (i = 0; i < n; i++) + if (locks[i]) + unlock_ref(locks[i]); + free(updates); + free(types); + free(locks); + free(delnames); + return ret; } /* @@ -3239,7 +3376,7 @@ char *shorten_unambiguous_ref(const char *refname, int strict) size_t total_len = 0; /* the rule list is NULL terminated, count them first */ - for (; ref_rev_parse_rules[nr_rules]; nr_rules++) + 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]); |