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format-patch: add an option to suppress commit hash

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Oftentimes, patches created by git format-patch will be stored in
version control or compared with diff.  In these cases, two otherwise
identical patches can have different commit hashes, leading to diff
noise.  Teach git format-patch a --zero-commit option that instead
produces an all-zero hash to avoid this diff noise.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2015-12-15 01:52:04 +00:00
committed by Junio C Hamano
parent 3e56e7245c
commit 3a30aa1787
5 changed files with 19 additions and 1 deletions
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3
log-tree.c
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@ -342,7 +342,8 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
{
const char *subject = NULL;
const char *extra_headers = opt->extra_headers;
const char *name = oid_to_hex(&commit->object.oid);
const char *name = oid_to_hex(opt->zero_commit ?
&null_oid : &commit->object.oid);
*need_8bit_cte_p = 0; /* unknown */
if (opt->total > 0) {