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refs.c: make ref_transaction_begin take an err argument

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Add an err argument to _begin so that on non-fatal failures in future ref
backends we can report a nice error back to the caller.
While _begin can currently never fail for other reasons than OOM, in which
case we die() anyway, we may add other types of backends in the future.
For example, a hypothetical MySQL backend could fail in _begin with
"Can not connect to MySQL server. No route to host".

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ronnie Sahlberg
2014-05-19 10:42:34 -07:00
committed by Junio C Hamano
parent 8c8bdc0d35
commit 93a644ea9d
3 changed files with 6 additions and 3 deletions
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5
builtin/update-ref.c
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@ -365,7 +365,9 @@ 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();
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)
@ -374,6 +376,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
if (ref_transaction_commit(transaction, msg, &err))
die("%s", err.buf);
ref_transaction_free(transaction);
strbuf_release(&err);
return 0;
}