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authorJunio C Hamano <gitster@pobox.com>2014-09-11 17:33:30 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-09-11 17:33:31 (GMT)
commit01d678a2263c0c71e42475335b5b0b578936a7d1 (patch)
treeee12372c4c7069f782902713187139ad5004575c
parent5e1dc4885840e45d6290feb209e0f6df1ad5fde6 (diff)
parent88499b296b5f62338d7fa4019c7b5f9012b4ab88 (diff)
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Merge branch 'rs/ref-transaction-1'
The second batch of the transactional ref update series. * rs/ref-transaction-1: (22 commits) update-ref --stdin: pass transaction around explicitly update-ref --stdin: narrow scope of err strbuf refs.c: make delete_ref use a transaction refs.c: make prune_ref use a transaction to delete the ref refs.c: remove lock_ref_sha1 refs.c: remove the update_ref_write function refs.c: remove the update_ref_lock function refs.c: make lock_ref_sha1 static walker.c: use ref transaction for ref updates fast-import.c: use a ref transaction when dumping tags receive-pack.c: use a reference transaction for updating the refs refs.c: change update_ref to use a transaction branch.c: use ref transaction for all ref updates fast-import.c: change update_branch to use ref transactions sequencer.c: use ref transactions for all ref updates commit.c: use ref transactions for updates replace.c: use the ref transaction functions for updates tag.c: use ref transactions when doing updates refs.c: add transaction.status and track OPEN/CLOSED refs.c: make ref_transaction_begin take an err argument ...
-rw-r--r--branch.c31
-rw-r--r--builtin/commit.c25
-rw-r--r--builtin/receive-pack.c25
-rw-r--r--builtin/replace.c14
-rw-r--r--builtin/tag.c16
-rw-r--r--builtin/update-ref.c52
-rw-r--r--fast-import.c54
-rw-r--r--refs.c245
-rw-r--r--refs.h77
-rw-r--r--sequencer.c26
-rw-r--r--walker.c81
11 files changed, 398 insertions, 248 deletions
diff --git a/branch.c b/branch.c
index df6b120..9a2228e 100644
--- a/branch.c
+++ b/branch.c
@@ -210,7 +210,6 @@ void create_branch(const char *head,
int force, int reflog, int clobber_head,
int quiet, enum branch_track track)
{
- struct ref_lock *lock = NULL;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, msg[PATH_MAX + 20];
@@ -269,15 +268,6 @@ void create_branch(const char *head,
die(_("Not a valid branch point: '%s'."), start_name);
hashcpy(sha1, commit->object.sha1);
- if (!dont_change_ref) {
- lock = lock_any_ref_for_update(ref.buf, NULL, 0, NULL);
- if (!lock)
- die_errno(_("Failed to lock ref for update"));
- }
-
- if (reflog)
- log_all_ref_updates = 1;
-
if (forcing)
snprintf(msg, sizeof msg, "branch: Reset to %s",
start_name);
@@ -285,13 +275,26 @@ void create_branch(const char *head,
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);
+ if (reflog)
+ log_all_ref_updates = 1;
+
+ if (!dont_change_ref) {
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, ref.buf, sha1,
+ null_sha1, 0, !forcing, &err) ||
+ ref_transaction_commit(transaction, msg, &err))
+ die("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ }
+
if (real_ref && track)
setup_tracking(ref.buf + 11, real_ref, track, quiet);
- if (!dont_change_ref)
- if (write_ref_sha1(lock, sha1, msg) < 0)
- die_errno(_("Failed to write ref"));
-
strbuf_release(&ref);
free(real_ref);
}
diff --git a/builtin/commit.c b/builtin/commit.c
index ec0048e..5911447 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1651,11 +1651,12 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
const char *index_file, *reflog_msg;
char *nl;
unsigned char sha1[20];
- struct ref_lock *ref_lock;
struct commit_list *parents = NULL, **pptr = &parents;
struct stat statbuf;
struct commit *current_head = NULL;
struct commit_extra_header *extra = NULL;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
if (argc == 2 && !strcmp(argv[1], "-h"))
usage_with_options(builtin_commit_usage, builtin_commit_options);
@@ -1777,16 +1778,6 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
strbuf_release(&author_ident);
free_commit_extra_headers(extra);
- ref_lock = lock_any_ref_for_update("HEAD",
- !current_head
- ? NULL
- : current_head->object.sha1,
- 0, NULL);
- if (!ref_lock) {
- rollback_index_files();
- die(_("cannot lock HEAD ref"));
- }
-
nl = strchr(sb.buf, '\n');
if (nl)
strbuf_setlen(&sb, nl + 1 - sb.buf);
@@ -1795,10 +1786,17 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
strbuf_insert(&sb, 0, reflog_msg, strlen(reflog_msg));
strbuf_insert(&sb, strlen(reflog_msg), ": ", 2);
- if (write_ref_sha1(ref_lock, sha1, sb.buf) < 0) {
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, "HEAD", sha1,
+ current_head
+ ? current_head->object.sha1 : NULL,
+ 0, !!current_head, &err) ||
+ ref_transaction_commit(transaction, sb.buf, &err)) {
rollback_index_files();
- die(_("cannot update HEAD ref"));
+ die("%s", err.buf);
}
+ ref_transaction_free(transaction);
unlink(git_path("CHERRY_PICK_HEAD"));
unlink(git_path("REVERT_HEAD"));
@@ -1827,5 +1825,6 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
if (!quiet)
print_summary(prefix, sha1, !current_head);
+ strbuf_release(&err);
return 0;
}
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 5ad9075..afb8d99 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -473,7 +473,6 @@ static const char *update(struct command *cmd, struct shallow_info *si)
const char *namespaced_name;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
- struct ref_lock *lock;
/* only refs/... are allowed */
if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
@@ -574,19 +573,27 @@ static const char *update(struct command *cmd, struct shallow_info *si)
return NULL; /* good */
}
else {
+ struct strbuf err = STRBUF_INIT;
+ struct ref_transaction *transaction;
+
if (shallow_update && si->shallow_ref[cmd->index] &&
update_shallow_ref(cmd, si))
return "shallow error";
- lock = lock_any_ref_for_update(namespaced_name, old_sha1,
- 0, NULL);
- if (!lock) {
- rp_error("failed to lock %s", name);
- return "failed to lock";
- }
- if (write_ref_sha1(lock, new_sha1, "push")) {
- return "failed to write"; /* error() already called */
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, namespaced_name,
+ new_sha1, old_sha1, 0, 1, &err) ||
+ ref_transaction_commit(transaction, "push", &err)) {
+ ref_transaction_free(transaction);
+
+ rp_error("%s", err.buf);
+ strbuf_release(&err);
+ return "failed to update ref";
}
+
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
return NULL; /* good */
}
}
diff --git a/builtin/replace.c b/builtin/replace.c
index d2aac64..8020db8 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -155,7 +155,8 @@ static int replace_object_sha1(const char *object_ref,
unsigned char prev[20];
enum object_type obj_type, repl_type;
char ref[PATH_MAX];
- struct ref_lock *lock;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
obj_type = sha1_object_info(object, NULL);
repl_type = sha1_object_info(repl, NULL);
@@ -168,12 +169,13 @@ static int replace_object_sha1(const char *object_ref,
check_ref_valid(object, prev, ref, sizeof(ref), force);
- lock = lock_any_ref_for_update(ref, prev, 0, NULL);
- if (!lock)
- die("%s: cannot lock the ref", ref);
- if (write_ref_sha1(lock, repl, NULL) < 0)
- die("%s: cannot update the ref", ref);
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, ref, repl, prev, 0, 1, &err) ||
+ ref_transaction_commit(transaction, NULL, &err))
+ die("%s", err.buf);
+ ref_transaction_free(transaction);
return 0;
}
diff --git a/builtin/tag.c b/builtin/tag.c
index 19eb747..a81b9e4 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -576,7 +576,6 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
struct strbuf ref = STRBUF_INIT;
unsigned char object[20], prev[20];
const char *object_ref, *tag;
- struct ref_lock *lock;
struct create_tag_options opt;
char *cleanup_arg = NULL;
int annotate = 0, force = 0, lines = -1;
@@ -584,6 +583,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
const char *msgfile = NULL, *keyid = NULL;
struct msg_arg msg = { 0, STRBUF_INIT };
struct commit_list *with_commit = NULL;
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
struct option options[] = {
OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
{ OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
@@ -729,14 +730,17 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
if (annotate)
create_tag(object, tag, &buf, &opt, prev, object);
- lock = lock_any_ref_for_update(ref.buf, prev, 0, NULL);
- if (!lock)
- die(_("%s: cannot lock the ref"), ref.buf);
- if (write_ref_sha1(lock, object, NULL) < 0)
- die(_("%s: cannot update the ref"), ref.buf);
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, ref.buf, object, prev,
+ 0, 1, &err) ||
+ ref_transaction_commit(transaction, NULL, &err))
+ die("%s", err.buf);
+ ref_transaction_free(transaction);
if (force && !is_null_sha1(prev) && hashcmp(prev, object))
printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
+ strbuf_release(&err);
strbuf_release(&buf);
strbuf_release(&ref);
return 0;
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 3067b11..54a48c0 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -12,11 +12,8 @@ static const char * const git_update_ref_usage[] = {
NULL
};
-static struct ref_transaction *transaction;
-
static char line_termination = '\n';
static int update_flags;
-static struct strbuf err = STRBUF_INIT;
/*
* Parse one whitespace- or NUL-terminated, possibly C-quoted argument
@@ -177,8 +174,10 @@ static int parse_next_sha1(struct strbuf *input, const char **next,
* depending on how line_termination is set.
*/
-static const char *parse_cmd_update(struct strbuf *input, const char *next)
+static const char *parse_cmd_update(struct ref_transaction *transaction,
+ struct strbuf *input, const char *next)
{
+ struct strbuf err = STRBUF_INIT;
char *refname;
unsigned char new_sha1[20];
unsigned char old_sha1[20];
@@ -204,12 +203,15 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
update_flags = 0;
free(refname);
+ strbuf_release(&err);
return next;
}
-static const char *parse_cmd_create(struct strbuf *input, const char *next)
+static const char *parse_cmd_create(struct ref_transaction *transaction,
+ struct strbuf *input, const char *next)
{
+ struct strbuf err = STRBUF_INIT;
char *refname;
unsigned char new_sha1[20];
@@ -226,16 +228,21 @@ static const char *parse_cmd_create(struct strbuf *input, const char *next)
if (*next != line_termination)
die("create %s: extra input: %s", refname, next);
- ref_transaction_create(transaction, refname, new_sha1, update_flags);
+ if (ref_transaction_create(transaction, refname, new_sha1,
+ update_flags, &err))
+ die("%s", err.buf);
update_flags = 0;
free(refname);
+ strbuf_release(&err);
return next;
}
-static const char *parse_cmd_delete(struct strbuf *input, const char *next)
+static const char *parse_cmd_delete(struct ref_transaction *transaction,
+ struct strbuf *input, const char *next)
{
+ struct strbuf err = STRBUF_INIT;
char *refname;
unsigned char old_sha1[20];
int have_old;
@@ -256,17 +263,21 @@ static const char *parse_cmd_delete(struct strbuf *input, const char *next)
if (*next != line_termination)
die("delete %s: extra input: %s", refname, next);
- ref_transaction_delete(transaction, refname, old_sha1,
- update_flags, have_old);
+ if (ref_transaction_delete(transaction, refname, old_sha1,
+ update_flags, have_old, &err))
+ die("%s", err.buf);
update_flags = 0;
free(refname);
+ strbuf_release(&err);
return next;
}
-static const char *parse_cmd_verify(struct strbuf *input, const char *next)
+static const char *parse_cmd_verify(struct ref_transaction *transaction,
+ struct strbuf *input, const char *next)
{
+ struct strbuf err = STRBUF_INIT;
char *refname;
unsigned char new_sha1[20];
unsigned char old_sha1[20];
@@ -294,6 +305,7 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
update_flags = 0;
free(refname);
+ strbuf_release(&err);
return next;
}
@@ -307,7 +319,7 @@ static const char *parse_cmd_option(struct strbuf *input, const char *next)
return next + 8;
}
-static void update_refs_stdin(void)
+static void update_refs_stdin(struct ref_transaction *transaction)
{
struct strbuf input = STRBUF_INIT;
const char *next;
@@ -322,13 +334,13 @@ static void update_refs_stdin(void)
else if (isspace(*next))
die("whitespace before command: %s", next);
else if (starts_with(next, "update "))
- next = parse_cmd_update(&input, next + 7);
+ next = parse_cmd_update(transaction, &input, next + 7);
else if (starts_with(next, "create "))
- next = parse_cmd_create(&input, next + 7);
+ next = parse_cmd_create(transaction, &input, next + 7);
else if (starts_with(next, "delete "))
- next = parse_cmd_delete(&input, next + 7);
+ next = parse_cmd_delete(transaction, &input, next + 7);
else if (starts_with(next, "verify "))
- next = parse_cmd_verify(&input, next + 7);
+ next = parse_cmd_verify(transaction, &input, next + 7);
else if (starts_with(next, "option "))
next = parse_cmd_option(&input, next + 7);
else
@@ -362,15 +374,21 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
die("Refusing to perform update with empty message.");
if (read_stdin) {
- transaction = ref_transaction_begin();
+ struct strbuf err = STRBUF_INIT;
+ struct ref_transaction *transaction;
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction)
+ die("%s", err.buf);
if (delete || no_deref || argc > 0)
usage_with_options(git_update_ref_usage, options);
if (end_null)
line_termination = '\0';
- update_refs_stdin();
+ update_refs_stdin(transaction);
if (ref_transaction_commit(transaction, msg, &err))
die("%s", err.buf);
ref_transaction_free(transaction);
+ strbuf_release(&err);
return 0;
}
diff --git a/fast-import.c b/fast-import.c
index 34e780d..2b31053 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1679,8 +1679,9 @@ found_entry:
static int update_branch(struct branch *b)
{
static const char *msg = "fast-import";
- struct ref_lock *lock;
+ struct ref_transaction *transaction;
unsigned char old_sha1[20];
+ struct strbuf err = STRBUF_INIT;
if (read_ref(b->name, old_sha1))
hashclr(old_sha1);
@@ -1689,29 +1690,33 @@ static int update_branch(struct branch *b)
delete_ref(b->name, old_sha1, 0);
return 0;
}
- lock = lock_any_ref_for_update(b->name, old_sha1, 0, NULL);
- if (!lock)
- return error("Unable to lock %s", b->name);
if (!force_update && !is_null_sha1(old_sha1)) {
struct commit *old_cmit, *new_cmit;
old_cmit = lookup_commit_reference_gently(old_sha1, 0);
new_cmit = lookup_commit_reference_gently(b->sha1, 0);
- if (!old_cmit || !new_cmit) {
- unlock_ref(lock);
+ if (!old_cmit || !new_cmit)
return error("Branch %s is missing commits.", b->name);
- }
if (!in_merge_bases(old_cmit, new_cmit)) {
- unlock_ref(lock);
warning("Not updating %s"
" (new tip %s does not contain %s)",
b->name, sha1_to_hex(b->sha1), sha1_to_hex(old_sha1));
return -1;
}
}
- if (write_ref_sha1(lock, b->sha1, msg) < 0)
- return error("Unable to update %s", b->name);
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, b->name, b->sha1, old_sha1,
+ 0, 1, &err) ||
+ ref_transaction_commit(transaction, msg, &err)) {
+ ref_transaction_free(transaction);
+ error("%s", err.buf);
+ strbuf_release(&err);
+ return -1;
+ }
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
return 0;
}
@@ -1730,15 +1735,32 @@ static void dump_tags(void)
{
static const char *msg = "fast-import";
struct tag *t;
- struct ref_lock *lock;
- char ref_name[PATH_MAX];
+ struct strbuf ref_name = STRBUF_INIT;
+ struct strbuf err = STRBUF_INIT;
+ struct ref_transaction *transaction;
+ transaction = ref_transaction_begin(&err);
+ if (!transaction) {
+ failure |= error("%s", err.buf);
+ goto cleanup;
+ }
for (t = first_tag; t; t = t->next_tag) {
- sprintf(ref_name, "tags/%s", t->name);
- lock = lock_ref_sha1(ref_name, NULL);
- if (!lock || write_ref_sha1(lock, t->sha1, msg) < 0)
- failure |= error("Unable to update %s", ref_name);
+ strbuf_reset(&ref_name);
+ strbuf_addf(&ref_name, "refs/tags/%s", t->name);
+
+ if (ref_transaction_update(transaction, ref_name.buf, t->sha1,
+ NULL, 0, 0, &err)) {
+ failure |= error("%s", err.buf);
+ goto cleanup;
+ }
}
+ if (ref_transaction_commit(transaction, msg, &err))
+ failure |= error("%s", err.buf);
+
+ cleanup:
+ ref_transaction_free(transaction);
+ strbuf_release(&ref_name);
+ strbuf_release(&err);
}
static void dump_marks_helper(FILE *f,
diff --git a/refs.c b/refs.c
index 27927f2..808e261 100644
--- a/refs.c
+++ b/refs.c
@@ -25,6 +25,11 @@ static unsigned char refname_disposition[256] = {
};
/*
+ * Used as a flag to ref_transaction_delete when a loose ref is being
+ * pruned.
+ */
+#define REF_ISPRUNING 0x0100
+/*
* Try to read one refname component from the front of refname.
* Return the length of the component found, or -1 if the component is
* not legal. It is legal if it is something reasonable to have under
@@ -2068,7 +2073,10 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
return logs_found;
}
-/* This function should make sure errno is meaningful on error */
+/*
+ * Locks a "refs/" ref returning the lock on success and NULL on failure.
+ * On failure errno is set to something meaningful.
+ */
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
const unsigned char *old_sha1,
int flags, int *type_p)
@@ -2169,15 +2177,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
return NULL;
}
-struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
-{
- char refpath[PATH_MAX];
- if (check_refname_format(refname, 0))
- return NULL;
- strcpy(refpath, mkpath("refs/%s", refname));
- return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
-}
-
struct ref_lock *lock_any_ref_for_update(const char *refname,
const unsigned char *old_sha1,
int flags, int *type_p)
@@ -2387,13 +2386,25 @@ static void try_remove_empty_parents(char *name)
/* make sure nobody touched the ref, and unlink */
static void prune_ref(struct ref_to_prune *r)
{
- struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
- if (lock) {
- unlink_or_warn(git_path("%s", r->name));
- unlock_ref(lock);
- try_remove_empty_parents(r->name);
+ if (check_refname_format(r->name + 5, 0))
+ return;
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, r->name, r->sha1,
+ REF_ISPRUNING, 1, &err) ||
+ ref_transaction_commit(transaction, NULL, &err)) {
+ ref_transaction_free(transaction);
+ error("%s", err.buf);
+ strbuf_release(&err);
+ return;
}
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ try_remove_empty_parents(r->name);
}
static void prune_refs(struct ref_to_prune *r)
@@ -2536,11 +2547,6 @@ int repack_without_refs(const char **refnames, int n, struct strbuf *err)
return ret;
}
-static int repack_without_ref(const char *refname)
-{
- return repack_without_refs(&refname, 1, NULL);
-}
-
static int delete_ref_loose(struct ref_lock *lock, int flag)
{
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
@@ -2558,24 +2564,22 @@ static int delete_ref_loose(struct ref_lock *lock, int flag)
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)
+ struct ref_transaction *transaction;
+ struct strbuf err = STRBUF_INIT;
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_delete(transaction, refname, sha1, delopt,
+ sha1 && !is_null_sha1(sha1), &err) ||
+ ref_transaction_commit(transaction, NULL, &err)) {
+ error("%s", err.buf);
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
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.
- */
- ret |= repack_without_ref(lock->ref_name);
-
- unlink_or_warn(git_path("logs/%s", lock->ref_name));
- clear_loose_ref_cache(&ref_cache);
- unlock_ref(lock);
- return ret;
+ }
+ ref_transaction_free(transaction);
+ strbuf_release(&err);
+ return 0;
}
/*
@@ -3332,43 +3336,6 @@ int for_each_reflog(each_ref_fn fn, void *cb_data)
return retval;
}
-static struct ref_lock *update_ref_lock(const char *refname,
- const unsigned char *oldval,
- int flags, int *type_p,
- enum action_on_err onerr)
-{
- 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) {
- 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;
-}
-
-static int update_ref_write(const char *action, const char *refname,
- const unsigned char *sha1, struct ref_lock *lock,
- struct strbuf *err, enum action_on_err onerr)
-{
- if (write_ref_sha1(lock, sha1, action) < 0) {
- const char *str = "Cannot update the ref '%s'.";
- if (err)
- strbuf_addf(err, str, refname);
-
- switch (onerr) {
- 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
@@ -3386,6 +3353,21 @@ struct ref_update {
};
/*
+ * Transaction states.
+ * OPEN: The transaction is in a valid state and can accept new updates.
+ * An OPEN transaction can be committed.
+ * CLOSED: A closed transaction is no longer active and no other operations
+ * than free can be used on it in this state.
+ * A transaction can either become closed by successfully committing
+ * an active transaction or if there is a failure while building
+ * the transaction thus rendering it failed/inactive.
+ */
+enum ref_transaction_state {
+ REF_TRANSACTION_OPEN = 0,
+ REF_TRANSACTION_CLOSED = 1
+};
+
+/*
* 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.
@@ -3394,9 +3376,10 @@ struct ref_transaction {
struct ref_update **updates;
size_t alloc;
size_t nr;
+ enum ref_transaction_state state;
};
-struct ref_transaction *ref_transaction_begin(void)
+struct ref_transaction *ref_transaction_begin(struct strbuf *err)
{
return xcalloc(1, sizeof(struct ref_transaction));
}
@@ -3436,6 +3419,9 @@ int ref_transaction_update(struct ref_transaction *transaction,
{
struct ref_update *update;
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: update called for transaction that is not open");
+
if (have_old && !old_sha1)
die("BUG: have_old is true but old_sha1 is NULL");
@@ -3448,44 +3434,84 @@ int ref_transaction_update(struct ref_transaction *transaction,
return 0;
}
-void ref_transaction_create(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- int flags)
+int ref_transaction_create(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ int flags,
+ struct strbuf *err)
{
- struct ref_update *update = add_update(transaction, refname);
+ struct ref_update *update;
+
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: create called for transaction that is not open");
+
+ if (!new_sha1 || is_null_sha1(new_sha1))
+ die("BUG: create ref with null new_sha1");
+
+ 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;
+ return 0;
}
-void ref_transaction_delete(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *old_sha1,
- int flags, int have_old)
+int ref_transaction_delete(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ int flags, int have_old,
+ struct strbuf *err)
{
- struct ref_update *update = add_update(transaction, refname);
+ struct ref_update *update;
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: delete called for transaction that is not open");
+
+ if (have_old && !old_sha1)
+ die("BUG: have_old is true but old_sha1 is NULL");
+
+ 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);
}
+ return 0;
}
int update_ref(const char *action, const char *refname,
const unsigned char *sha1, const unsigned char *oldval,
int flags, enum action_on_err onerr)
{
- struct ref_lock *lock;
- lock = update_ref_lock(refname, oldval, flags, NULL, onerr);
- if (!lock)
+ struct ref_transaction *t;
+ struct strbuf err = STRBUF_INIT;
+
+ t = ref_transaction_begin(&err);
+ if (!t ||
+ ref_transaction_update(t, refname, sha1, oldval, flags,
+ !!oldval, &err) ||
+ ref_transaction_commit(t, action, &err)) {
+ const char *str = "update_ref failed for ref '%s': %s";
+
+ ref_transaction_free(t);
+ switch (onerr) {
+ case UPDATE_REFS_MSG_ON_ERR:
+ error(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_DIE_ON_ERR:
+ die(str, refname, err.buf);
+ break;
+ case UPDATE_REFS_QUIET_ON_ERR:
+ break;
+ }
+ strbuf_release(&err);
return 1;
- return update_ref_write(action, refname, sha1, lock, NULL, onerr);
+ }
+ strbuf_release(&err);
+ ref_transaction_free(t);
+ return 0;
}
static int ref_update_compare(const void *r1, const void *r2)
@@ -3519,8 +3545,13 @@ int ref_transaction_commit(struct ref_transaction *transaction,
int n = transaction->nr;
struct ref_update **updates = transaction->updates;
- if (!n)
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: commit called for transaction that is not open");
+
+ if (!n) {
+ transaction->state = REF_TRANSACTION_CLOSED;
return 0;
+ }
/* Allocate work space */
delnames = xmalloc(sizeof(*delnames) * n);
@@ -3535,12 +3566,12 @@ int ref_transaction_commit(struct ref_transaction *transaction,
for (i = 0; i < n; 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,
- UPDATE_REFS_QUIET_ON_ERR);
+ update->lock = lock_any_ref_for_update(update->refname,
+ (update->have_old ?
+ update->old_sha1 :
+ NULL),
+ update->flags,
+ &update->type);
if (!update->lock) {
if (err)
strbuf_addf(err, "Cannot lock the ref '%s'.",
@@ -3555,14 +3586,15 @@ int ref_transaction_commit(struct ref_transaction *transaction,
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, err,
- UPDATE_REFS_QUIET_ON_ERR);
- update->lock = NULL; /* freed by update_ref_write */
- if (ret)
+ ret = write_ref_sha1(update->lock, update->new_sha1,
+ msg);
+ update->lock = NULL; /* freed by write_ref_sha1 */
+ if (ret) {
+ if (err)
+ strbuf_addf(err, "Cannot update the ref '%s'.",
+ update->refname);
goto cleanup;
+ }
}
}
@@ -3571,8 +3603,9 @@ int ref_transaction_commit(struct ref_transaction *transaction,
struct ref_update *update = updates[i];
if (update->lock) {
- delnames[delnum++] = update->lock->ref_name;
ret |= delete_ref_loose(update->lock, update->type);
+ if (!(update->flags & REF_ISPRUNING))
+ delnames[delnum++] = update->lock->ref_name;
}
}
@@ -3582,6 +3615,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
clear_loose_ref_cache(&ref_cache);
cleanup:
+ transaction->state = REF_TRANSACTION_CLOSED;
+
for (i = 0; i < n; i++)
if (updates[i]->lock)
unlock_ref(updates[i]->lock);
diff --git a/refs.h b/refs.h
index ec46acd..68c5770 100644
--- a/refs.h
+++ b/refs.h
@@ -10,6 +10,38 @@ struct ref_lock {
int force_write;
};
+/*
+ * A ref_transaction represents a collection of ref updates
+ * that should succeed or fail together.
+ *
+ * Calling sequence
+ * ----------------
+ * - Allocate and initialize a `struct ref_transaction` by calling
+ * `ref_transaction_begin()`.
+ *
+ * - List intended ref updates by calling functions like
+ * `ref_transaction_update()` and `ref_transaction_create()`.
+ *
+ * - Call `ref_transaction_commit()` to execute the transaction.
+ * If this succeeds, the ref updates will have taken place and
+ * the transaction cannot be rolled back.
+ *
+ * - At any time call `ref_transaction_free()` to discard the
+ * transaction and free associated resources. In particular,
+ * this rolls back the transaction if it has not been
+ * successfully committed.
+ *
+ * Error handling
+ * --------------
+ *
+ * On error, transaction functions append a message about what
+ * went wrong to the 'err' argument. The message mentions what
+ * ref was being updated (if any) when the error occurred so it
+ * can be passed to 'die' or 'error' as-is.
+ *
+ * The message is appended to err without first clearing err.
+ * err will not be '\n' terminated.
+ */
struct ref_transaction;
/*
@@ -141,14 +173,17 @@ extern int is_branch(const char *refname);
extern int peel_ref(const char *refname, unsigned char *sha1);
/*
- * Locks a "refs/" ref returning the lock on success and NULL on failure.
- * On failure errno is set to something meaningful.
+ * Flags controlling lock_any_ref_for_update(), ref_transaction_update(),
+ * ref_transaction_create(), etc.
+ * REF_NODEREF: act on the ref directly, instead of dereferencing
+ * symbolic references.
+ *
+ * Flags >= 0x100 are reserved for internal use.
*/
-extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1);
-
-/** Locks any ref (for 'HEAD' type refs). */
#define REF_NODEREF 0x01
-/* errno is set to something meaningful on failure */
+/*
+ * This function sets errno to something meaningful on failure.
+ */
extern struct ref_lock *lock_any_ref_for_update(const char *refname,
const unsigned char *old_sha1,
int flags, int *type_p);
@@ -232,7 +267,7 @@ enum action_on_err {
* Begin a reference transaction. The reference transaction must
* be freed by calling ref_transaction_free().
*/
-struct ref_transaction *ref_transaction_begin(void);
+struct ref_transaction *ref_transaction_begin(struct strbuf *err);
/*
* The following functions add a reference check or update to a
@@ -250,7 +285,7 @@ struct ref_transaction *ref_transaction_begin(void);
* it must not have existed beforehand.
* Function returns 0 on success and non-zero on failure. A failure to update
* means that the transaction as a whole has failed and will need to be
- * rolled back. On failure the err buffer will be updated.
+ * rolled back.
*/
int ref_transaction_update(struct ref_transaction *transaction,
const char *refname,
@@ -264,28 +299,34 @@ int ref_transaction_update(struct ref_transaction *transaction,
* that the reference should have after the update; it must not be the
* null SHA-1. It is verified that the reference does not exist
* already.
+ * Function returns 0 on success and non-zero on failure. A failure to create
+ * means that the transaction as a whole has failed and will need to be
+ * rolled back.
*/
-void ref_transaction_create(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- int flags);
+int ref_transaction_create(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ int flags,
+ struct strbuf *err);
/*
* Add a reference deletion to transaction. If have_old is true, then
* old_sha1 holds the value that the reference should have had before
* the update (which must not be the null SHA-1).
+ * Function returns 0 on success and non-zero on failure. A failure to delete
+ * means that the transaction as a whole has failed and will need to be
+ * rolled back.
*/
-void ref_transaction_delete(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *old_sha1,
- int flags, int have_old);
+int ref_transaction_delete(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ int flags, int have_old,
+ struct strbuf *err);
/*
* Commit all of the changes that have been queued in transaction, as
* atomically as possible. Return a nonzero value if there is a
* problem.
- * If err is non-NULL we will add an error string to it to explain why
- * the transaction failed. The string does not end in newline.
*/
int ref_transaction_commit(struct ref_transaction *transaction,
const char *msg, struct strbuf *err);
diff --git a/sequencer.c b/sequencer.c
index 3c060e0..5e8a207 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -237,23 +237,33 @@ static int error_dirty_index(struct replay_opts *opts)
static int fast_forward_to(const unsigned char *to, const unsigned char *from,
int unborn, struct replay_opts *opts)
{
- struct ref_lock *ref_lock;
+ struct ref_transaction *transaction;
struct strbuf sb = STRBUF_INIT;
- int ret;
+ struct strbuf err = STRBUF_INIT;
read_cache();
if (checkout_fast_forward(from, to, 1))
exit(128); /* the callee should have complained already */
- ref_lock = lock_any_ref_for_update("HEAD", unborn ? null_sha1 : from,
- 0, NULL);
- if (!ref_lock)
- return error(_("Failed to lock HEAD during fast_forward_to"));
strbuf_addf(&sb, "%s: fast-forward", action_name(opts));
- ret = write_ref_sha1(ref_lock, to, sb.buf);
+
+ transaction = ref_transaction_begin(&err);
+ if (!transaction ||
+ ref_transaction_update(transaction, "HEAD",
+ to, unborn ? null_sha1 : from,
+ 0, 1, &err) ||
+ ref_transaction_commit(transaction, sb.buf, &err)) {
+ ref_transaction_free(transaction);
+ error("%s", err.buf);
+ strbuf_release(&sb);
+ strbuf_release(&err);
+ return -1;
+ }
strbuf_release(&sb);
- return ret;
+ strbuf_release(&err);
+ ref_transaction_free(transaction);
+ return 0;
}
static int do_recursive_merge(struct commit *base, struct commit *next,
diff --git a/walker.c b/walker.c
index 0148264..b929dcc 100644
--- a/walker.c
+++ b/walker.c
@@ -251,64 +251,73 @@ void walker_targets_free(int targets, char **target, const char **write_ref)
int walker_fetch(struct walker *walker, int targets, char **target,
const char **write_ref, const char *write_ref_log_details)
{
- struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
+ struct strbuf refname = STRBUF_INIT;
+ struct strbuf err = STRBUF_INIT;
+ struct ref_transaction *transaction = NULL;
unsigned char *sha1 = xmalloc(targets * 20);
- const char *msg;
- char *to_free = NULL;
- int ret;
- int i;
+ char *msg = NULL;
+ int i, ret = -1;
save_commit_buffer = 0;
- for (i = 0; i < targets; i++) {
- if (!write_ref || !write_ref[i])
- continue;
-
- lock[i] = lock_ref_sha1(write_ref[i], NULL);
- if (!lock[i]) {
- error("Can't lock ref %s", write_ref[i]);
- goto unlock_and_fail;
+ if (write_ref) {
+ transaction = ref_transaction_begin(&err);
+ if (!transaction) {
+ error("%s", err.buf);
+ goto done;
}
}
-
if (!walker->get_recover)
for_each_ref(mark_complete, NULL);
for (i = 0; i < targets; i++) {
if (interpret_target(walker, target[i], &sha1[20 * i])) {
error("Could not interpret response from server '%s' as something to pull", target[i]);
- goto unlock_and_fail;
+ goto done;
}
if (process(walker, lookup_unknown_object(&sha1[20 * i])))
- goto unlock_and_fail;
+ goto done;
}
if (loop(walker))
- goto unlock_and_fail;
-
- if (write_ref_log_details)
- msg = to_free = xstrfmt("fetch from %s", write_ref_log_details);
- else
- msg = "fetch (unknown)";
+ goto done;
+ if (!write_ref) {
+ ret = 0;
+ goto done;
+ }
+ if (write_ref_log_details) {
+ msg = xstrfmt("fetch from %s", write_ref_log_details);
+ } else {
+ msg = NULL;
+ }
for (i = 0; i < targets; i++) {
- if (!write_ref || !write_ref[i])
+ if (!write_ref[i])
continue;
- ret = write_ref_sha1(lock[i], &sha1[20 * i], msg);
- lock[i] = NULL;
- if (ret)
- goto unlock_and_fail;
+ strbuf_reset(&refname);
+ strbuf_addf(&refname, "refs/%s", write_ref[i]);
+ if (ref_transaction_update(transaction, refname.buf,
+ &sha1[20 * i], NULL, 0, 0,
+ &err)) {
+ error("%s", err.buf);
+ goto done;
+ }
+ }
+ if (ref_transaction_commit(transaction,
+ msg ? msg : "fetch (unknown)",
+ &err)) {
+ error("%s", err.buf);
+ goto done;
}
- free(to_free);
-
- return 0;
-unlock_and_fail:
- for (i = 0; i < targets; i++)
- if (lock[i])
- unlock_ref(lock[i]);
- free(to_free);
+ ret = 0;
- return -1;
+done:
+ ref_transaction_free(transaction);
+ free(msg);
+ free(sha1);
+ strbuf_release(&err);
+ strbuf_release(&refname);
+ return ret;
}
void walker_free(struct walker *walker)