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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 <xiaolong.ye@intel.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
tags/v2.23.0-rc0
Stephen Boyd Junio C Hamano 5 months ago
parent
commit
a8f6855f48
8 changed files with 42 additions and 34 deletions
  1. +1
    -1
      Documentation/git-format-patch.txt
  2. +1
    -1
      builtin/log.c
  3. +1
    -16
      builtin/patch-id.c
  4. +27
    -5
      diff.c
  5. +2
    -1
      diff.h
  6. +5
    -5
      patch-ids.c
  7. +1
    -1
      patch-ids.h
  8. +4
    -4
      t/t4014-format-patch.sh

+ 1
- 1
Documentation/git-format-patch.txt View File

@@ -583,7 +583,7 @@ of 'base commit' in topological order before the patches can be applied.
The 'base commit' is shown as "base-commit: " followed by the 40-hex of
the commit object name. A 'prerequisite patch' is shown as
"prerequisite-patch-id: " followed by the 40-hex 'patch id', which can
be obtained by passing the patch through the `git patch-id --unstable`
be obtained by passing the patch through the `git patch-id --stable`
command.

Imagine that on top of the public commit P, you applied well-known

+ 1
- 1
builtin/log.c View File

@@ -1435,7 +1435,7 @@ static void prepare_bases(struct base_tree_info *bases,
struct object_id *patch_id;
if (*commit_base_at(&commit_base, commit))
continue;
if (commit_patch_id(commit, &diffopt, &oid, 0))
if (commit_patch_id(commit, &diffopt, &oid, 0, 1))
die(_("cannot get patch id"));
ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
patch_id = bases->patch_id + bases->nr_patch_id;

+ 1
- 16
builtin/patch-id.c View File

@@ -1,5 +1,6 @@
#include "builtin.h"
#include "config.h"
#include "diff.h"

static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
{
@@ -54,22 +55,6 @@ static int scan_hunk_header(const char *p, int *p_before, int *p_after)
return 1;
}

static 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 int get_one_patchid(struct object_id *next_oid, struct object_id *result,
struct strbuf *line_buf, int stable)
{

+ 27
- 5
diff.c View File

@@ -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]);

+ 2
- 1
diff.h View File

@@ -436,7 +436,8 @@ int run_diff_files(struct rev_info *revs, unsigned int option);
int run_diff_index(struct rev_info *revs, int cached);

int do_diff_cache(const struct object_id *, struct diff_options *);
int diff_flush_patch_id(struct diff_options *, struct object_id *, int);
int diff_flush_patch_id(struct diff_options *, struct object_id *, int, int);
void flush_one_hunk(struct object_id *, git_SHA_CTX *);

int diff_result_code(struct diff_options *, int);


+ 5
- 5
patch-ids.c View File

@@ -11,7 +11,7 @@ static int patch_id_defined(struct commit *commit)
}

int commit_patch_id(struct commit *commit, struct diff_options *options,
struct object_id *oid, int diff_header_only)
struct object_id *oid, int diff_header_only, int stable)
{
if (!patch_id_defined(commit))
return -1;
@@ -22,7 +22,7 @@ int commit_patch_id(struct commit *commit, struct diff_options *options,
else
diff_root_tree_oid(&commit->object.oid, "", options);
diffcore_std(options);
return diff_flush_patch_id(options, oid, diff_header_only);
return diff_flush_patch_id(options, oid, diff_header_only, stable);
}

/*
@@ -46,11 +46,11 @@ static int patch_id_neq(const void *cmpfn_data,
struct patch_id *b = (void *)entry_or_key;

if (is_null_oid(&a->patch_id) &&
commit_patch_id(a->commit, opt, &a->patch_id, 0))
commit_patch_id(a->commit, opt, &a->patch_id, 0, 0))
return error("Could not get patch ID for %s",
oid_to_hex(&a->commit->object.oid));
if (is_null_oid(&b->patch_id) &&
commit_patch_id(b->commit, opt, &b->patch_id, 0))
commit_patch_id(b->commit, opt, &b->patch_id, 0, 0))
return error("Could not get patch ID for %s",
oid_to_hex(&b->commit->object.oid));
return !oideq(&a->patch_id, &b->patch_id);
@@ -80,7 +80,7 @@ static int init_patch_id_entry(struct patch_id *patch,
struct object_id header_only_patch_id;

patch->commit = commit;
if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1))
if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1, 0))
return -1;

hashmap_entry_init(patch, sha1hash(header_only_patch_id.hash));

+ 1
- 1
patch-ids.h View File

@@ -20,7 +20,7 @@ struct patch_ids {
};

int commit_patch_id(struct commit *commit, struct diff_options *options,
struct object_id *oid, int);
struct object_id *oid, int, int);
int init_patch_ids(struct repository *, struct patch_ids *);
int free_patch_ids(struct patch_ids *);
struct patch_id *add_commit_patch_id(struct commit *, struct patch_ids *);

+ 4
- 4
t/t4014-format-patch.sh View File

@@ -1583,15 +1583,15 @@ test_expect_success 'format-patch --base' '
git format-patch --stdout --base=HEAD~3 HEAD~.. | tail -n 7 >actual2 &&
echo >expected &&
echo "base-commit: $(git rev-parse HEAD~3)" >>expected &&
echo "prerequisite-patch-id: $(git show --patch HEAD~2 | git patch-id --unstable | awk "{print \$1}")" >>expected &&
echo "prerequisite-patch-id: $(git show --patch HEAD~1 | git patch-id --unstable | awk "{print \$1}")" >>expected &&
echo "prerequisite-patch-id: $(git show --patch HEAD~2 | git patch-id --stable | awk "{print \$1}")" >>expected &&
echo "prerequisite-patch-id: $(git show --patch HEAD~1 | git patch-id --stable | awk "{print \$1}")" >>expected &&
signature >> expected &&
test_cmp expected actual1 &&
test_cmp expected actual2 &&
echo >fail &&
echo "base-commit: $(git rev-parse HEAD~3)" >>fail &&
echo "prerequisite-patch-id: $(git show --patch HEAD~2 | git patch-id --stable | awk "{print \$1}")" >>fail &&
echo "prerequisite-patch-id: $(git show --patch HEAD~1 | git patch-id --stable | awk "{print \$1}")" >>fail &&
echo "prerequisite-patch-id: $(git show --patch HEAD~2 | git patch-id --unstable | awk "{print \$1}")" >>fail &&
echo "prerequisite-patch-id: $(git show --patch HEAD~1 | git patch-id --unstable | awk "{print \$1}")" >>fail &&
signature >> fail &&
! test_cmp fail actual1 &&
! test_cmp fail actual2

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