From a8f6855f48fd474719e92eecc66c29a28fdc0f46 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 26 Apr 2019 16:51:57 -0700 Subject: format-patch: make --base patch-id output stable We weren't flushing the context each time we processed a hunk in the patch-id generation code in diff.c, but we were doing that when we generated "stable" patch-ids with the 'patch-id' tool. Let's port that similar logic over from patch-id.c into diff.c so we can get the same hash when we're generating patch-ids for 'format-patch --base=' types of command invocations. Cc: Xiaolong Ye Signed-off-by: Stephen Boyd Signed-off-by: Junio C Hamano --- diff.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) (limited to 'diff.c') diff --git a/diff.c b/diff.c index 4d3cf83a27..8e3675b416 100644 --- a/diff.c +++ b/diff.c @@ -5988,6 +5988,22 @@ static int remove_space(char *line, int len) return dst - line; } +void flush_one_hunk(struct object_id *result, git_SHA_CTX *ctx) +{ + unsigned char hash[GIT_MAX_RAWSZ]; + unsigned short carry = 0; + int i; + + git_SHA1_Final(hash, ctx); + git_SHA1_Init(ctx); + /* 20-byte sum, with carry */ + for (i = 0; i < GIT_SHA1_RAWSZ; ++i) { + carry += result->hash[i] + hash[i]; + result->hash[i] = carry; + carry >>= 8; + } +} + static void patch_id_consume(void *priv, char *line, unsigned long len) { struct patch_id_t *data = priv; @@ -6012,8 +6028,8 @@ static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode) git_SHA1_Update(ctx, buf, len); } -/* returns 0 upon success, and writes result into sha1 */ -static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +/* returns 0 upon success, and writes result into oid */ +static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable) { struct diff_queue_struct *q = &diff_queued_diff; int i; @@ -6023,6 +6039,7 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid git_SHA1_Init(&ctx); memset(&data, 0, sizeof(struct patch_id_t)); data.ctx = &ctx; + oidclr(oid); for (i = 0; i < q->nr; i++) { xpparam_t xpp; @@ -6098,17 +6115,22 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid patch_id_consume, &data, &xpp, &xecfg)) return error("unable to generate patch-id diff for %s", p->one->path); + + if (stable) + flush_one_hunk(oid, &ctx); } - git_SHA1_Final(oid->hash, &ctx); + if (!stable) + git_SHA1_Final(oid->hash, &ctx); + return 0; } -int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only) +int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable) { struct diff_queue_struct *q = &diff_queued_diff; int i; - int result = diff_get_patch_id(options, oid, diff_header_only); + int result = diff_get_patch_id(options, oid, diff_header_only, stable); for (i = 0; i < q->nr; i++) diff_free_filepair(q->queue[i]); -- cgit v1.2.3