зеркало из https://github.com/microsoft/git.git
[PATCH] Allow reading "symbolic refs" that point to other refs
This extends the ref reading to understand a "symbolic ref": a ref file that starts with "ref: " and points to another ref file, and thus introduces the notion of ref aliases. This is in preparation of allowing HEAD to eventually not be a symlink, but one of these symbolic refs instead. [jc: Linus originally required the prefix to be "ref: " five bytes and nothing else, but I changed it to allow and strip any number of leading whitespaces to match what update-ref.c does.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Родитель
9b143c6e15
Коммит
ca8db1424d
1
cache.h
1
cache.h
|
@ -229,6 +229,7 @@ extern int has_pack_index(const unsigned char *sha1);
|
|||
extern int get_sha1(const char *str, unsigned char *sha1);
|
||||
extern int get_sha1_hex(const char *hex, unsigned char *sha1);
|
||||
extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
|
||||
extern int read_ref(const char *filename, unsigned char *sha1);
|
||||
|
||||
/* General helper functions */
|
||||
extern void usage(const char *err) NORETURN;
|
||||
|
|
73
refs.c
73
refs.c
|
@ -2,17 +2,43 @@
|
|||
#include "cache.h"
|
||||
|
||||
#include <errno.h>
|
||||
#include <ctype.h>
|
||||
|
||||
static int read_ref(const char *refname, unsigned char *sha1)
|
||||
/* We allow "recursive" symbolic refs. Only within reason, though */
|
||||
#define MAXDEPTH 5
|
||||
|
||||
int read_ref(const char *filename, unsigned char *sha1)
|
||||
{
|
||||
int ret = -1;
|
||||
int fd = open(git_path("%s", refname), O_RDONLY);
|
||||
int depth = 0;
|
||||
int ret = -1, fd;
|
||||
|
||||
while ((fd = open(filename, O_RDONLY)) >= 0) {
|
||||
char buffer[256];
|
||||
int len = read(fd, buffer, sizeof(buffer)-1);
|
||||
|
||||
if (fd >= 0) {
|
||||
char buffer[60];
|
||||
if (read(fd, buffer, sizeof(buffer)) >= 40)
|
||||
ret = get_sha1_hex(buffer, sha1);
|
||||
close(fd);
|
||||
if (len < 0)
|
||||
break;
|
||||
|
||||
buffer[len] = 0;
|
||||
while (len && isspace(buffer[len-1]))
|
||||
buffer[--len] = 0;
|
||||
|
||||
if (!strncmp(buffer, "ref:", 4)) {
|
||||
char *buf;
|
||||
if (depth > MAXDEPTH)
|
||||
break;
|
||||
depth++;
|
||||
buf = buffer + 4;
|
||||
len -= 4;
|
||||
while (len && isspace(*buf))
|
||||
buf++, len--;
|
||||
filename = git_path("%.*s", len, buf);
|
||||
continue;
|
||||
}
|
||||
if (len >= 40)
|
||||
ret = get_sha1_hex(buffer, sha1);
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
@ -54,7 +80,7 @@ static int do_for_each_ref(const char *base, int (*fn)(const char *path, const u
|
|||
break;
|
||||
continue;
|
||||
}
|
||||
if (read_ref(path, sha1) < 0)
|
||||
if (read_ref(git_path("%s", path), sha1) < 0)
|
||||
continue;
|
||||
if (!has_sha1_file(sha1))
|
||||
continue;
|
||||
|
@ -71,7 +97,7 @@ static int do_for_each_ref(const char *base, int (*fn)(const char *path, const u
|
|||
int head_ref(int (*fn)(const char *path, const unsigned char *sha1))
|
||||
{
|
||||
unsigned char sha1[20];
|
||||
if (!read_ref("HEAD", sha1))
|
||||
if (!read_ref(git_path("HEAD"), sha1))
|
||||
return fn("HEAD", sha1);
|
||||
return 0;
|
||||
}
|
||||
|
@ -101,33 +127,14 @@ static char *ref_lock_file_name(const char *ref)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int read_ref_file(const char *filename, unsigned char *sha1) {
|
||||
int fd = open(filename, O_RDONLY);
|
||||
char hex[41];
|
||||
if (fd < 0) {
|
||||
return error("Couldn't open %s\n", filename);
|
||||
}
|
||||
if ((read(fd, hex, 41) < 41) ||
|
||||
(hex[40] != '\n') ||
|
||||
get_sha1_hex(hex, sha1)) {
|
||||
error("Couldn't read a hash from %s\n", filename);
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
close(fd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int get_ref_sha1(const char *ref, unsigned char *sha1)
|
||||
{
|
||||
char *filename;
|
||||
int retval;
|
||||
const char *filename;
|
||||
|
||||
if (check_ref_format(ref))
|
||||
return -1;
|
||||
filename = ref_file_name(ref);
|
||||
retval = read_ref_file(filename, sha1);
|
||||
free(filename);
|
||||
return retval;
|
||||
filename = git_path("refs/%s", ref);
|
||||
return read_ref(filename, sha1);
|
||||
}
|
||||
|
||||
static int lock_ref_file(const char *filename, const char *lock_filename,
|
||||
|
@ -140,7 +147,7 @@ static int lock_ref_file(const char *filename, const char *lock_filename,
|
|||
return error("Couldn't open lock file for %s: %s",
|
||||
filename, strerror(errno));
|
||||
}
|
||||
retval = read_ref_file(filename, current_sha1);
|
||||
retval = read_ref(filename, current_sha1);
|
||||
if (old_sha1) {
|
||||
if (retval) {
|
||||
close(fd);
|
||||
|
|
17
sha1_name.c
17
sha1_name.c
|
@ -119,21 +119,6 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1)
|
|||
return -1;
|
||||
}
|
||||
|
||||
static int get_sha1_file(const char *path, unsigned char *result)
|
||||
{
|
||||
char buffer[60];
|
||||
int fd = open(path, O_RDONLY);
|
||||
int len;
|
||||
|
||||
if (fd < 0)
|
||||
return -1;
|
||||
len = read(fd, buffer, sizeof(buffer));
|
||||
close(fd);
|
||||
if (len < 40)
|
||||
return -1;
|
||||
return get_sha1_hex(buffer, result);
|
||||
}
|
||||
|
||||
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
|
||||
{
|
||||
static const char *prefix[] = {
|
||||
|
@ -150,7 +135,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
|
|||
|
||||
for (p = prefix; *p; p++) {
|
||||
char *pathname = git_path("%s/%.*s", *p, len, str);
|
||||
if (!get_sha1_file(pathname, sha1))
|
||||
if (!read_ref(pathname, sha1))
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче