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https://github.com/git/git
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Merge branch 'mt/patch-id-stable' (early part)
* 'mt/patch-id-stable' (early part): patch-id-test: test stable and unstable behaviour patch-id: make it stable against hunk reordering test doc: test_write_lines does not split its arguments test: add test_write_lines helper
This commit is contained in:
Junio C Hamano
commit
79e539404c
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@ -8,14 +8,14 @@ git-patch-id - Compute unique ID for a patch
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SYNOPSIS
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--------
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[verse]
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'git patch-id' < <patch>
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'git patch-id' [--stable | --unstable] < <patch>
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DESCRIPTION
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-----------
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A "patch ID" is nothing but a SHA-1 of the diff associated with a patch, with
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whitespace and line numbers ignored. As such, it's "reasonably stable", but at
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the same time also reasonably unique, i.e., two patches that have the same "patch
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ID" are almost guaranteed to be the same thing.
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A "patch ID" is nothing but a sum of SHA-1 of the file diffs associated with a
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patch, with whitespace and line numbers ignored. As such, it's "reasonably
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stable", but at the same time also reasonably unique, i.e., two patches that
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have the same "patch ID" are almost guaranteed to be the same thing.
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IOW, you can use this thing to look for likely duplicate commits.
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@ -27,6 +27,33 @@ This can be used to make a mapping from patch ID to commit ID.
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OPTIONS
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-------
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--stable::
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Use a "stable" sum of hashes as the patch ID. With this option:
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- Reordering file diffs that make up a patch does not affect the ID.
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In particular, two patches produced by comparing the same two trees
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with two different settings for "-O<orderfile>" result in the same
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patch ID signature, thereby allowing the computed result to be used
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as a key to index some meta-information about the change between
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the two trees;
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- Result is different from the value produced by git 1.9 and older
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or produced when an "unstable" hash (see --unstable below) is
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configured - even when used on a diff output taken without any use
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of "-O<orderfile>", thereby making existing databases storing such
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"unstable" or historical patch-ids unusable.
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This is the default if patchid.stable is set to true.
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--unstable::
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Use an "unstable" hash as the patch ID. With this option,
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the result produced is compatible with the patch-id value produced
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by git 1.9 and older. Users with pre-existing databases storing
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patch-ids produced by git 1.9 and older (who do not deal with reordered
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patches) may want to use this option.
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This is the default.
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<patch>::
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The diff to create the ID of.
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@ -1,17 +1,14 @@
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#include "builtin.h"
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static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
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static void flush_current_id(int patchlen, unsigned char *id, unsigned char *result)
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{
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unsigned char result[20];
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char name[50];
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if (!patchlen)
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return;
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git_SHA1_Final(result, c);
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memcpy(name, sha1_to_hex(id), 41);
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printf("%s %s\n", sha1_to_hex(result), name);
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git_SHA1_Init(c);
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}
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static int remove_space(char *line)
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@ -56,10 +53,31 @@ static int scan_hunk_header(const char *p, int *p_before, int *p_after)
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return 1;
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}
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static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct strbuf *line_buf)
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static void flush_one_hunk(unsigned char *result, git_SHA_CTX *ctx)
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{
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unsigned char hash[20];
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unsigned short carry = 0;
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int i;
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git_SHA1_Final(hash, ctx);
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git_SHA1_Init(ctx);
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/* 20-byte sum, with carry */
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for (i = 0; i < 20; ++i) {
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carry += result[i] + hash[i];
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result[i] = carry;
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carry >>= 8;
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}
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}
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static int get_one_patchid(unsigned char *next_sha1, unsigned char *result,
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struct strbuf *line_buf, int stable)
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{
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int patchlen = 0, found_next = 0;
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int before = -1, after = -1;
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git_SHA_CTX ctx;
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git_SHA1_Init(&ctx);
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hashclr(result);
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while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
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char *line = line_buf->buf;
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@ -107,6 +125,8 @@ static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct st
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break;
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/* Else we're parsing another header. */
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if (stable)
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flush_one_hunk(result, &ctx);
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before = after = -1;
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}
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@ -119,39 +139,63 @@ static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct st
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/* Compute the sha without whitespace */
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len = remove_space(line);
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patchlen += len;
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git_SHA1_Update(ctx, line, len);
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git_SHA1_Update(&ctx, line, len);
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}
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if (!found_next)
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hashclr(next_sha1);
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flush_one_hunk(result, &ctx);
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return patchlen;
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}
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static void generate_id_list(void)
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static void generate_id_list(int stable)
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{
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unsigned char sha1[20], n[20];
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git_SHA_CTX ctx;
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unsigned char sha1[20], n[20], result[20];
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int patchlen;
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struct strbuf line_buf = STRBUF_INIT;
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git_SHA1_Init(&ctx);
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hashclr(sha1);
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while (!feof(stdin)) {
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patchlen = get_one_patchid(n, &ctx, &line_buf);
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flush_current_id(patchlen, sha1, &ctx);
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patchlen = get_one_patchid(n, result, &line_buf, stable);
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flush_current_id(patchlen, sha1, result);
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hashcpy(sha1, n);
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}
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strbuf_release(&line_buf);
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}
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static const char patch_id_usage[] = "git patch-id < patch";
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static const char patch_id_usage[] = "git patch-id [--stable | --unstable] < patch";
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static int git_patch_id_config(const char *var, const char *value, void *cb)
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{
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int *stable = cb;
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if (!strcmp(var, "patchid.stable")) {
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*stable = git_config_bool(var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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int cmd_patch_id(int argc, const char **argv, const char *prefix)
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{
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if (argc != 1)
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int stable = -1;
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git_config(git_patch_id_config, &stable);
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/* If nothing is set, default to unstable. */
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if (stable < 0)
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stable = 0;
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if (argc == 2 && !strcmp(argv[1], "--stable"))
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stable = 1;
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else if (argc == 2 && !strcmp(argv[1], "--unstable"))
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stable = 0;
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else if (argc != 1)
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usage(patch_id_usage);
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generate_id_list();
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generate_id_list(stable);
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return 0;
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}
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21
t/README
21
t/README
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@ -596,6 +596,27 @@ library for your script to use.
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...
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'
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- test_write_lines <lines>
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Write <lines> on standard output, one line per argument.
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Useful to prepare multi-line files in a compact form.
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Example:
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test_write_lines a b c d e f g >foo
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Is a more compact equivalent of:
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cat >foo <<-EOF
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a
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b
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c
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d
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e
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f
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g
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EOF
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- test_pause
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This command is useful for writing and debugging tests and must be
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@ -5,27 +5,44 @@ test_description='git patch-id'
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. ./test-lib.sh
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test_expect_success 'setup' '
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test_commit initial foo a &&
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test_commit first foo b &&
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git checkout -b same HEAD^ &&
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test_commit same-msg foo b &&
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git checkout -b notsame HEAD^ &&
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test_commit notsame-msg foo c
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as="a a a a a a a a" && # eight a
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test_write_lines $as >foo &&
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test_write_lines $as >bar &&
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git add foo bar &&
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git commit -a -m initial &&
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test_write_lines $as b >foo &&
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test_write_lines $as b >bar &&
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git commit -a -m first &&
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git checkout -b same master &&
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git commit --amend -m same-msg &&
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git checkout -b notsame master &&
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echo c >foo &&
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echo c >bar &&
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git commit --amend -a -m notsame-msg &&
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test_write_lines bar foo >bar-then-foo &&
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test_write_lines foo bar >foo-then-bar
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'
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test_expect_success 'patch-id output is well-formed' '
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git log -p -1 | git patch-id > output &&
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git log -p -1 | git patch-id >output &&
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grep "^[a-f0-9]\{40\} $(git rev-parse HEAD)$" output
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'
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#calculate patch id. Make sure output is not empty.
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calc_patch_id () {
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git patch-id |
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sed "s# .*##" > patch-id_"$1"
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name="$1"
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shift
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git patch-id "$@" |
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sed "s/ .*//" >patch-id_"$name" &&
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test_line_count -gt 0 patch-id_"$name"
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}
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get_top_diff () {
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git log -p -1 "$@" -O bar-then-foo --
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}
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get_patch_id () {
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git log -p -1 "$1" | git patch-id |
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sed "s# .*##" > patch-id_"$1"
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get_top_diff "$1" | calc_patch_id "$@"
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}
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test_expect_success 'patch-id detects equality' '
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@ -56,6 +73,69 @@ test_expect_success 'whitespace is irrelevant in footer' '
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test_cmp patch-id_master patch-id_same
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'
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cmp_patch_id () {
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if
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test "$1" = "relevant"
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then
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! test_cmp patch-id_"$2" patch-id_"$3"
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else
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test_cmp patch-id_"$2" patch-id_"$3"
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fi
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}
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test_patch_id_file_order () {
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relevant="$1"
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shift
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name="order-${1}-$relevant"
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shift
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get_top_diff "master" | calc_patch_id "$name" "$@" &&
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git checkout same &&
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git format-patch -1 --stdout -O foo-then-bar |
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calc_patch_id "ordered-$name" "$@" &&
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cmp_patch_id $relevant "$name" "ordered-$name"
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}
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# combined test for options: add more tests here to make them
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# run with all options
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test_patch_id () {
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test_patch_id_file_order "$@"
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}
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# small tests with detailed diagnostic for basic options.
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test_expect_success 'file order is irrelevant with --stable' '
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test_patch_id_file_order irrelevant --stable --stable
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'
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test_expect_success 'file order is relevant with --unstable' '
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test_patch_id_file_order relevant --unstable --unstable
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'
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#Now test various option combinations.
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test_expect_success 'default is unstable' '
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test_patch_id relevant default
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'
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test_expect_success 'patchid.stable = true is stable' '
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test_config patchid.stable true &&
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test_patch_id irrelevant patchid.stable=true
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'
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test_expect_success 'patchid.stable = false is unstable' '
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test_config patchid.stable false &&
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test_patch_id relevant patchid.stable=false
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'
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test_expect_success '--unstable overrides patchid.stable = true' '
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test_config patchid.stable true &&
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test_patch_id relevant patchid.stable=true--unstable --unstable
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'
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test_expect_success '--stable overrides patchid.stable = false' '
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test_config patchid.stable false &&
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test_patch_id irrelevant patchid.stable=false--stable --stable
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'
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test_expect_success 'patch-id supports git-format-patch MIME output' '
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get_patch_id master &&
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git checkout same &&
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@ -717,6 +717,11 @@ test_ln_s_add () {
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fi
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}
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# This function writes out its parameters, one per line
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test_write_lines () {
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printf "%s\n" "$@"
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}
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perl () {
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command "$PERL_PATH" "$@"
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}
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