Change ref_transaction_commit so that it does not free the transaction.
Instead require that a caller will end a transaction by either calling
ref_transaction_rollback or ref_transaction_free.
By having the transaction object remaining valid after _commit returns allows
us to write much nicer code and still be able to call ref_transaction_rollback
safely. Instead of this horribleness
t = ref_transaction_begin();
if ((!t ||
ref_transaction_update(t, refname, sha1, oldval, flags,
!!oldval)) ||
(ref_transaction_commit(t, action, &err) && !(t = NULL))) {
ref_transaction_rollback(t);
we can now just do the much nicer
t = ref_transaction_begin();
if (!t ||
ref_transaction_update(t, refname, sha1, oldval, flags,
!!oldval) ||
ref_transaction_commit(&t, action, &err)) {
ref_transaction_rollback(t);
... die/return ...
ref_transaction_free(transaction);
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
branch.c | 1 +
builtin/commit.c | 1 +
builtin/replace.c | 1 +
builtin/tag.c | 1 +
builtin/update-ref.c | 1 +
fast-import.c | 8 ++++----
refs.c | 7 ++-----
refs.h | 14 +++++++++-----
sequencer.c | 8 ++++----
9 files changed, 24 insertions(+), 18 deletions(-)
diff --git a/branch.c b/branch.c
index 2aa5c82..8e58908 100644
--- a/branch.c
+++ b/branch.c
@@ -305,6 +305,7 @@ void create_branch(const char *head,
ref_transaction_commit(transaction, msg, &err))
die_errno(_("%s: failed to write ref: %s"),
ref.buf, err.buf);
+ ref_transaction_free(transaction);
}
if (real_ref && track)
diff --git a/builtin/commit.c b/builtin/commit.c
index a56f47a..b806c59 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1686,6 +1686,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
rollback_index_files();
die(_("HEAD: cannot update ref: %s"), err.buf);
}
+ ref_transaction_free(transaction);
unlink(git_path("CHERRY_PICK_HEAD"));
unlink(git_path("REVERT_HEAD"));
diff --git a/builtin/replace.c b/builtin/replace.c
index b037b29..5999f7d 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -165,6 +165,7 @@ static int replace_object(const char *object_ref, const char *replace_ref,
ref_transaction_commit(transaction, NULL, &err))
die(_("%s: failed to replace ref: %s"), ref, err.buf);
+ ref_transaction_free(transaction);
return 0;
}
diff --git a/builtin/tag.c b/builtin/tag.c
index 31e32cb..4701bda 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -648,6 +648,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
0, !is_null_sha1(prev)) ||
ref_transaction_commit(transaction, NULL, &err))
die(_("%s: cannot update the ref: %s"), ref.buf, 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));
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index fc3512f..7fe9c11 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -373,6 +373,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
update_refs_stdin();
if (ref_transaction_commit(transaction, msg, &err))
die("%s", err.buf);
+ ref_transaction_free(transaction);
return 0;
}
diff --git a/fast-import.c b/fast-import.c
index 300c8dc..ab36de5 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1703,15 +1703,15 @@ static int update_branch(struct branch *b)
}
}
transaction = ref_transaction_begin();
- if ((!transaction ||
+ if (!transaction ||
ref_transaction_update(transaction, b->name, b->sha1, old_sha1,
- 0, 1)) ||
- (ref_transaction_commit(transaction, msg, &err) &&
- !(transaction = NULL))) {
+ 0, 1) ||
+ ref_transaction_commit(transaction, msg, &err)) {
ref_transaction_rollback(transaction);
return error("Unable to update branch %s: %s", b->name,
strbuf_detach(&err, NULL));
}
+ ref_transaction_free(transaction);
return 0;
}
diff --git a/refs.c b/refs.c
index c6ee43c..add95ba 100644
--- a/refs.c
+++ b/refs.c
@@ -3302,7 +3302,7 @@ struct ref_transaction *ref_transaction_begin(void)
return xcalloc(1, sizeof(struct ref_transaction));
}
-static void ref_transaction_free(struct ref_transaction *transaction)
+void ref_transaction_free(struct ref_transaction *transaction)
{
int i;
@@ -3451,10 +3451,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
int n = transaction->nr;
struct ref_update **updates = transaction->updates;
- if (!n) {
- ref_transaction_free(transaction);
+ if (!n)
return 0;
- }
/* Allocate work space */
delnames = xmalloc(sizeof(*delnames) * n);
@@ -3520,7 +3518,6 @@ cleanup:
if (updates[i]->lock)
unlock_ref(updates[i]->lock);
free(delnames);
- ref_transaction_free(transaction);
return ret;
}
diff --git a/refs.h b/refs.h
index 5eb500e..fcde43e 100644
--- a/refs.h
+++ b/refs.h
@@ -210,8 +210,8 @@ enum action_on_err {
/*
* Begin a reference transaction. The reference transaction must
- * eventually be commited using ref_transaction_commit() or rolled
- * back using ref_transaction_rollback().
+ * eventually be freed by either calling ref_transaction_rollback()
+ * or ref_transaction_free().
*/
struct ref_transaction *ref_transaction_begin(void);
@@ -267,13 +267,17 @@ int ref_transaction_delete(struct ref_transaction *transaction,
/*
* Commit all of the changes that have been queued in transaction, as
* atomically as possible. Return a nonzero value if there is a
- * problem. The ref_transaction is freed by this function.
- * If err is non-NULL we will add an error string to it to explain why
- * the transaction failed.
+ * problem. If err is non-NULL we will add an error string to it to explain
+ * why the transaction failed.
*/
int ref_transaction_commit(struct ref_transaction *transaction,
const char *msg, struct strbuf *err);
+/*
+ * Free an existing transaction.
+ */
+void ref_transaction_free(struct ref_transaction *transaction);
+
/** Lock a ref and then write its file */
int update_ref(const char *action, const char *refname,
const unsigned char *sha1, const unsigned char *oldval,
diff --git a/sequencer.c b/sequencer.c
index 449e093..5c424be 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -283,16 +283,16 @@ static int fast_forward_to(const unsigned char *to, const unsigned char *from,
strbuf_addf(&sb, "%s: fast-forward", action_name(opts));
transaction = ref_transaction_begin();
- if ((!transaction ||
+ if (!transaction ||
ref_transaction_update(transaction, "HEAD", to, from,
- 0, !unborn)) ||
- (ref_transaction_commit(transaction, sb.buf, &err) &&
- !(transaction = NULL))) {
+ 0, !unborn) ||
+ ref_transaction_commit(transaction, sb.buf, &err)) {
ref_transaction_rollback(transaction);
strbuf_release(&sb);
return error(_("HEAD: Could not fast-forward: %s\n"),
strbuf_detach(&err, NULL));
}
+ ref_transaction_free(transaction);
strbuf_release(&sb);
return 0;
--
1.9.1.528.g98b8868.dirty
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