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 <sahlb...@google.com>
---
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 | 14 ++++++--------
refs.h | 14 +++++++++-----
sequencer.c | 8 ++++----
9 files changed, 28 insertions(+), 21 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 592f019..16fadbb 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1726,6 +1726,7 @@ int cmd_commit(int argc, const char **argv, const char
*prefix)
rollback_index_files();
die("%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 ee34d5d..91354a7 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -164,6 +164,7 @@ static int replace_object_sha1(const char *object_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 bf2a5c3..fbd2989 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -708,6 +708,7 @@ 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 2a51df1..b5f4731 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 79d219b..3e356da 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1708,16 +1708,16 @@ 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);
error("Unable to update branch %s: %s", b->name, err.buf);
strbuf_release(&err);
return -1;
}
+ ref_transaction_free(transaction);
return 0;
}
diff --git a/refs.c b/refs.c
index 4a37f87..82a8d4e 100644
--- a/refs.c
+++ b/refs.c
@@ -3322,7 +3322,7 @@ 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;
@@ -3420,10 +3420,10 @@ int update_ref(const char *action, const char *refname,
struct strbuf err = STRBUF_INIT;
t = ref_transaction_begin();
- if ((!t ||
+ if (!t ||
ref_transaction_update(t, refname, sha1, oldval, flags,
- !!oldval)) ||
- (ref_transaction_commit(t, action, &err) && !(t = NULL))) {
+ !!oldval) ||
+ ref_transaction_commit(t, action, &err)) {
const char *str = "update_ref failed for ref '%s': %s";
ref_transaction_rollback(t);
@@ -3437,6 +3437,7 @@ int update_ref(const char *action, const char *refname,
strbuf_release(&err);
return 1;
}
+ ref_transaction_free(t);
return 0;
}
@@ -3471,10 +3472,8 @@ 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);
@@ -3541,7 +3540,6 @@ 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 cba2f3d..b94e1ac 100644
--- a/refs.h
+++ b/refs.h
@@ -216,8 +216,8 @@ 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);
@@ -282,13 +282,17 @@ 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. The string does not end in newline.
+ * 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);
+/*
+ * 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 9282a12..0cfdaf0 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -283,17 +283,17 @@ 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);
error(_("HEAD: Could not fast-forward: %s\n"), err.buf);
strbuf_release(&sb);
strbuf_release(&err);
return -1;
}
+ ref_transaction_free(transaction);
strbuf_release(&sb);
return 0;
--
2.0.0.rc3.477.g0f8edf7
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