-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add "git-patch-id" program to generate patch ID's.
A "patch ID" is nothing but a SHA1 of the diff associated with a patch, with whitespace and line numbers ignored. As such, it's "reasonably stable", but at the same time also reasonably unique, ie two patches that have the same "patch ID" are almost guaranteed to be the same thing. IOW, you can use this thing to look for likely duplicate commits.
- Loading branch information
Linus Torvalds
committed
Jun 23, 2005
1 parent
1809266
commit f976722
Showing
2 changed files
with
81 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,79 @@ | ||
#include <ctype.h> | ||
#include "cache.h" | ||
|
||
static void flush_current_id(int patchlen, unsigned char *id, SHA_CTX *c) | ||
{ | ||
unsigned char result[20]; | ||
char name[50]; | ||
|
||
if (!patchlen) | ||
return; | ||
|
||
SHA1_Final(result, c); | ||
memcpy(name, sha1_to_hex(id), 41); | ||
printf("%s %s\n", sha1_to_hex(result), name); | ||
SHA1_Init(c); | ||
} | ||
|
||
static int remove_space(char *line) | ||
{ | ||
char *src = line; | ||
char *dst = line; | ||
unsigned char c; | ||
|
||
while ((c = *src++) != '\0') { | ||
if (!isspace(c)) | ||
*dst++ = c; | ||
} | ||
return dst - line; | ||
} | ||
|
||
static void generate_id_list(void) | ||
{ | ||
static unsigned char sha1[20]; | ||
static char line[1000]; | ||
SHA_CTX ctx; | ||
int patchlen = 0; | ||
|
||
SHA1_Init(&ctx); | ||
while (fgets(line, sizeof(line), stdin) != NULL) { | ||
unsigned char n[20]; | ||
char *p = line; | ||
int len; | ||
|
||
if (!memcmp(line, "diff-tree ", 10)) | ||
p += 10; | ||
|
||
if (!get_sha1_hex(p, n)) { | ||
flush_current_id(patchlen, sha1, &ctx); | ||
memcpy(sha1, n, 20); | ||
patchlen = 0; | ||
continue; | ||
} | ||
|
||
/* Ignore commit comments */ | ||
if (!patchlen && memcmp(line, "diff ", 5)) | ||
continue; | ||
|
||
/* Ignore line numbers when computing the SHA1 of the patch */ | ||
if (!memcmp(line, "@@ -", 4)) | ||
continue; | ||
|
||
/* Compute the sha without whitespace */ | ||
len = remove_space(line); | ||
patchlen += len; | ||
SHA1_Update(&ctx, line, len); | ||
} | ||
flush_current_id(patchlen, sha1, &ctx); | ||
} | ||
|
||
static const char patch_id_usage[] = "usage: git-patch-id < patch"; | ||
|
||
int main(int argc, char **argv) | ||
{ | ||
if (argc != 1) | ||
usage(patch_id_usage); | ||
|
||
generate_id_list(); | ||
return 0; | ||
} |