Update ref_transaction_update() do some basic error checking and return
non-zero on error. Update all callers to check ref_transaction_update() for
error. There are currently no conditions in _update that will return error but
there will be in the future. Add an err argument that will be updated on
failure.
Also check for BUGs during update and die(BUG:...) if we are calling
_update with have_old but the old_sha1 pointer is NULL.
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
builtin/update-ref.c | 12 +++++++-----
refs.c | 18 ++++++++++++------
refs.h | 14 +++++++++-----
3 files changed, 28 insertions(+), 16 deletions(-)
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 2bef2a0..9f328b2 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -16,6 +16,7 @@ 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
@@ -197,8 +198,9 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
if (*next != line_termination)
die("update %s: extra input: %s", refname, next);
- ref_transaction_update(transaction, refname, new_sha1, old_sha1,
- update_flags, have_old);
+ if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
+ update_flags, have_old, &err))
+ die("update %s: failed: %s", refname, err.buf);
update_flags = 0;
free(refname);
@@ -286,8 +288,9 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
if (*next != line_termination)
die("verify %s: extra input: %s", refname, next);
- ref_transaction_update(transaction, refname, new_sha1, old_sha1,
- update_flags, have_old);
+ if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
+ update_flags, have_old, &err))
+ die("verify %s: %s", refname, err.buf);
update_flags = 0;
free(refname);
@@ -342,7 +345,6 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
const char *refname, *oldval, *msg = NULL;
unsigned char sha1[20], oldsha1[20];
int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
- struct strbuf err = STRBUF_INIT;
struct option options[] = {
OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
diff --git a/refs.c b/refs.c
index 3eb73a3..3c9b981 100644
--- a/refs.c
+++ b/refs.c
@@ -3381,19 +3381,25 @@ static struct ref_update *add_update(struct ref_transaction *transaction,
return update;
}
-void ref_transaction_update(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- const unsigned char *old_sha1,
- int flags, int have_old)
+int ref_transaction_update(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ 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 (have_old && !old_sha1)
+ die("BUG: have_old is true but old_sha1 is NULL");
+ 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);
+ return 0;
}
void ref_transaction_create(struct ref_transaction *transaction,
diff --git a/refs.h b/refs.h
index 555ee59..11d07ee 100644
--- a/refs.h
+++ b/refs.h
@@ -242,12 +242,16 @@ void ref_transaction_rollback(struct ref_transaction *transaction);
* be deleted. If have_old is true, then old_sha1 holds the value
* that the reference should have had before the update, or zeros if
* 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.
*/
-void ref_transaction_update(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- const unsigned char *old_sha1,
- int flags, int have_old);
+int ref_transaction_update(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ int flags, int have_old,
+ struct strbuf *err);
/*
* Add a reference creation to transaction. new_sha1 is the value
--
2.0.0.rc3.477.gffe78a2
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