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create_branch: use xstrfmt for reflog message

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We generate a reflog message that contains some fixed text
plus a branch name, and use a buffer of size PATH_MAX + 20.
This mostly works if you assume that refnames are shorter
than PATH_MAX, but:

  1. That's not necessarily true. PATH_MAX is not always the
     filesystem's limit.

  2. The "20" is not sufficiently large for the fixed text
     anyway.

Let's just switch to a heap buffer so we don't have to even
care.

Signed-off-by: Jeff King <peff@peff.net>
This commit is contained in:
Jeff King 2017-03-28 15:46:40 -04:00 committed by Junio C Hamano
parent 3818b258dc
commit cddac45219
1 changed files with 4 additions and 5 deletions
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9
branch.c
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@ -296,14 +296,12 @@ void create_branch(const char *name, const char *start_name,
if (!dont_change_ref) {
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
char msg[PATH_MAX + 20];
char *msg;
if (forcing)
snprintf(msg, sizeof msg, "branch: Reset to %s",
start_name);
msg = xstrfmt("branch: Reset to %s", start_name);
else
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);
msg = xstrfmt("branch: Created from %s", start_name);
transaction = ref_transaction_begin(&err);
if (!transaction ||
@ -314,6 +312,7 @@ void create_branch(const char *name, const char *start_name,
die("%s", err.buf);
ref_transaction_free(transaction);
strbuf_release(&err);
free(msg);
}
if (real_ref && track)