git/refs.c

1563 lines
37 KiB
C
Raw Normal View History

#include "cache.h"
#include "refs.h"
#include "object.h"
#include "tag.h"
#include "dir.h"
/* ISSYMREF=01 and ISPACKED=02 are public interfaces */
#define REF_KNOWS_PEELED 04
struct ref_list {
struct ref_list *next;
unsigned char flag; /* ISSYMREF? ISPACKED? */
unsigned char sha1[20];
unsigned char peeled[20];
char name[FLEX_ARRAY];
};
static const char *parse_ref_line(char *line, unsigned char *sha1)
{
/*
* 42: the answer to everything.
*
* In this case, it happens to be the answer to
* 40 (length of sha1 hex representation)
* +1 (space in between hex and name)
* +1 (newline at the end of the line)
*/
int len = strlen(line) - 42;
if (len <= 0)
return NULL;
if (get_sha1_hex(line, sha1) < 0)
return NULL;
if (!isspace(line[40]))
return NULL;
line += 41;
if (isspace(*line))
return NULL;
if (line[len] != '\n')
return NULL;
line[len] = 0;
return line;
}
static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
int flag, struct ref_list *list,
struct ref_list **new_entry)
{
int len;
struct ref_list *entry;
/* Allocate it and add it in.. */
len = strlen(name) + 1;
entry = xmalloc(sizeof(struct ref_list) + len);
hashcpy(entry->sha1, sha1);
hashclr(entry->peeled);
memcpy(entry->name, name, len);
entry->flag = flag;
entry->next = list;
if (new_entry)
*new_entry = entry;
return entry;
}
/* merge sort the ref list */
static struct ref_list *sort_ref_list(struct ref_list *list)
{
int psize, qsize, last_merge_count, cmp;
struct ref_list *p, *q, *l, *e;
struct ref_list *new_list = list;
int k = 1;
int merge_count = 0;
if (!list)
return list;
do {
last_merge_count = merge_count;
merge_count = 0;
psize = 0;
p = new_list;
q = new_list;
new_list = NULL;
l = NULL;
while (p) {
merge_count++;
while (psize < k && q->next) {
q = q->next;
psize++;
}
qsize = k;
while ((psize > 0) || (qsize > 0 && q)) {
if (qsize == 0 || !q) {
e = p;
p = p->next;
psize--;
} else if (psize == 0) {
e = q;
q = q->next;
qsize--;
} else {
cmp = strcmp(q->name, p->name);
if (cmp < 0) {
e = q;
q = q->next;
qsize--;
} else if (cmp > 0) {
e = p;
p = p->next;
psize--;
} else {
if (hashcmp(q->sha1, p->sha1))
die("Duplicated ref, and SHA1s don't match: %s",
q->name);
warning("Duplicated ref: %s", q->name);
e = q;
q = q->next;
qsize--;
free(e);
e = p;
p = p->next;
psize--;
}
}
e->next = NULL;
if (l)
l->next = e;
if (!new_list)
new_list = e;
l = e;
}
p = q;
};
k = k * 2;
} while ((last_merge_count != merge_count) || (last_merge_count != 1));
return new_list;
}
/*
* Future: need to be in "struct repository"
* when doing a full libification.
*/
static struct cached_refs {
char did_loose;
char did_packed;
struct ref_list *loose;
struct ref_list *packed;
} cached_refs;
static struct ref_list *current_ref;
static struct ref_list *extra_refs;
static void free_ref_list(struct ref_list *list)
{
struct ref_list *next;
for ( ; list; list = next) {
next = list->next;
free(list);
}
}
static void invalidate_cached_refs(void)
{
struct cached_refs *ca = &cached_refs;
if (ca->did_loose && ca->loose)
free_ref_list(ca->loose);
if (ca->did_packed && ca->packed)
free_ref_list(ca->packed);
ca->loose = ca->packed = NULL;
ca->did_loose = ca->did_packed = 0;
}
static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
{
struct ref_list *list = NULL;
struct ref_list *last = NULL;
char refline[PATH_MAX];
int flag = REF_ISPACKED;
while (fgets(refline, sizeof(refline), f)) {
unsigned char sha1[20];
const char *name;
static const char header[] = "# pack-refs with:";
if (!strncmp(refline, header, sizeof(header)-1)) {
const char *traits = refline + sizeof(header) - 1;
if (strstr(traits, " peeled "))
flag |= REF_KNOWS_PEELED;
/* perhaps other traits later as well */
continue;
}
name = parse_ref_line(refline, sha1);
if (name) {
list = add_ref(name, sha1, flag, list, &last);
continue;
}
if (last &&
refline[0] == '^' &&
strlen(refline) == 42 &&
refline[41] == '\n' &&
!get_sha1_hex(refline + 1, sha1))
hashcpy(last->peeled, sha1);
}
cached_refs->packed = sort_ref_list(list);
}
void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
{
extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
}
void clear_extra_refs(void)
{
free_ref_list(extra_refs);
extra_refs = NULL;
}
static struct ref_list *get_packed_refs(void)
{
if (!cached_refs.did_packed) {
FILE *f = fopen(git_path("packed-refs"), "r");
cached_refs.packed = NULL;
if (f) {
read_packed_refs(f, &cached_refs);
fclose(f);
}
cached_refs.did_packed = 1;
}
return cached_refs.packed;
}
static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
{
DIR *dir = opendir(git_path("%s", base));
if (dir) {
struct dirent *de;
int baselen = strlen(base);
char *ref = xmalloc(baselen + 257);
memcpy(ref, base, baselen);
if (baselen && base[baselen-1] != '/')
ref[baselen++] = '/';
while ((de = readdir(dir)) != NULL) {
unsigned char sha1[20];
struct stat st;
int flag;
int namelen;
if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if (namelen > 255)
continue;
if (has_extension(de->d_name, ".lock"))
continue;
memcpy(ref + baselen, de->d_name, namelen+1);
if (stat(git_path("%s", ref), &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
list = get_ref_dir(ref, list);
continue;
}
if (!resolve_ref(ref, sha1, 1, &flag)) {
error("%s points nowhere!", ref);
continue;
}
list = add_ref(ref, sha1, flag, list, NULL);
}
free(ref);
closedir(dir);
}
return sort_ref_list(list);
}
static struct ref_list *get_loose_refs(void)
{
if (!cached_refs.did_loose) {
cached_refs.loose = get_ref_dir("refs", NULL);
cached_refs.did_loose = 1;
}
return cached_refs.loose;
}
/* We allow "recursive" symbolic refs. Only within reason, though */
#define MAXDEPTH 5
#define MAXREFLEN (1024)
static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
{
FILE *f;
struct cached_refs refs;
struct ref_list *ref;
int retval;
strcpy(name + pathlen, "packed-refs");
f = fopen(name, "r");
if (!f)
return -1;
read_packed_refs(f, &refs);
fclose(f);
ref = refs.packed;
retval = -1;
while (ref) {
if (!strcmp(ref->name, refname)) {
retval = 0;
memcpy(result, ref->sha1, 20);
break;
}
ref = ref->next;
}
free_ref_list(refs.packed);
return retval;
}
static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
{
int fd, len = strlen(refname);
char buffer[128], *p;
if (recursion > MAXDEPTH || len > MAXREFLEN)
return -1;
memcpy(name + pathlen, refname, len+1);
fd = open(name, O_RDONLY);
if (fd < 0)
return resolve_gitlink_packed_ref(name, pathlen, refname, result);
len = read(fd, buffer, sizeof(buffer)-1);
close(fd);
if (len < 0)
return -1;
while (len && isspace(buffer[len-1]))
len--;
buffer[len] = 0;
/* Was it a detached head or an old-fashioned symlink? */
if (!get_sha1_hex(buffer, result))
return 0;
/* Symref? */
if (strncmp(buffer, "ref:", 4))
return -1;
p = buffer + 4;
while (isspace(*p))
p++;
return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
}
int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
{
int len = strlen(path), retval;
char *gitdir;
const char *tmp;
while (len && path[len-1] == '/')
len--;
if (!len)
return -1;
gitdir = xmalloc(len + MAXREFLEN + 8);
memcpy(gitdir, path, len);
memcpy(gitdir + len, "/.git", 6);
len += 5;
tmp = read_gitfile_gently(gitdir);
if (tmp) {
free(gitdir);
len = strlen(tmp);
gitdir = xmalloc(len + MAXREFLEN + 3);
memcpy(gitdir, tmp, len);
}
gitdir[len] = '/';
gitdir[++len] = '\0';
retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
free(gitdir);
return retval;
}
const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
{
int depth = MAXDEPTH;
ssize_t len;
char buffer[256];
static char ref_buffer[256];
if (flag)
*flag = 0;
for (;;) {
const char *path = git_path("%s", ref);
struct stat st;
char *buf;
int fd;
if (--depth < 0)
return NULL;
/* Special case: non-existing file.
* Not having the refs/heads/new-branch is OK
* if we are writing into it, so is .git/HEAD
* that points at refs/heads/master still to be
* born. It is NOT OK if we are resolving for
* reading.
*/
if (lstat(path, &st) < 0) {
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
struct ref_list *list = get_packed_refs();
while (list) {
if (!strcmp(ref, list->name)) {
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
hashcpy(sha1, list->sha1);
if (flag)
*flag |= REF_ISPACKED;
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
return ref;
}
list = list->next;
}
if (reading || errno != ENOENT)
return NULL;
hashclr(sha1);
return ref;
}
/* Follow "normalized" - ie "refs/.." symlinks by hand */
if (S_ISLNK(st.st_mode)) {
len = readlink(path, buffer, sizeof(buffer)-1);
if (len >= 5 && !memcmp("refs/", buffer, 5)) {
buffer[len] = 0;
strcpy(ref_buffer, buffer);
ref = ref_buffer;
if (flag)
*flag |= REF_ISSYMREF;
continue;
}
}
/* Is it a directory? */
if (S_ISDIR(st.st_mode)) {
errno = EISDIR;
return NULL;
}
/*
* Anything else, just open it and try to use it as
* a ref
*/
fd = open(path, O_RDONLY);
if (fd < 0)
return NULL;
len = read_in_full(fd, buffer, sizeof(buffer)-1);
close(fd);
/*
* Is it a symbolic ref?
*/
if (len < 4 || memcmp("ref:", buffer, 4))
break;
buf = buffer + 4;
len -= 4;
while (len && isspace(*buf))
buf++, len--;
while (len && isspace(buf[len-1]))
len--;
buf[len] = 0;
memcpy(ref_buffer, buf, len + 1);
ref = ref_buffer;
if (flag)
*flag |= REF_ISSYMREF;
}
if (len < 40 || get_sha1_hex(buffer, sha1))
return NULL;
return ref;
}
int read_ref(const char *ref, unsigned char *sha1)
{
if (resolve_ref(ref, sha1, 1, NULL))
return 0;
return -1;
}
static int do_one_ref(const char *base, each_ref_fn fn, int trim,
void *cb_data, struct ref_list *entry)
{
if (strncmp(base, entry->name, trim))
return 0;
if (is_null_sha1(entry->sha1))
return 0;
if (!has_sha1_file(entry->sha1)) {
error("%s does not point to a valid object!", entry->name);
return 0;
}
current_ref = entry;
return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
}
int peel_ref(const char *ref, unsigned char *sha1)
{
int flag;
unsigned char base[20];
struct object *o;
if (current_ref && (current_ref->name == ref
|| !strcmp(current_ref->name, ref))) {
if (current_ref->flag & REF_KNOWS_PEELED) {
hashcpy(sha1, current_ref->peeled);
return 0;
}
hashcpy(base, current_ref->sha1);
goto fallback;
}
if (!resolve_ref(ref, base, 1, &flag))
return -1;
if ((flag & REF_ISPACKED)) {
struct ref_list *list = get_packed_refs();
while (list) {
if (!strcmp(list->name, ref)) {
if (list->flag & REF_KNOWS_PEELED) {
hashcpy(sha1, list->peeled);
return 0;
}
/* older pack-refs did not leave peeled ones */
break;
}
list = list->next;
}
}
fallback:
o = parse_object(base);
if (o && o->type == OBJ_TAG) {
o = deref_tag(o, ref, 0);
if (o) {
hashcpy(sha1, o->sha1);
return 0;
}
}
return -1;
}
static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
void *cb_data)
{
int retval = 0;
struct ref_list *packed = get_packed_refs();
struct ref_list *loose = get_loose_refs();
struct ref_list *extra;
for (extra = extra_refs; extra; extra = extra->next)
retval = do_one_ref(base, fn, trim, cb_data, extra);
while (packed && loose) {
struct ref_list *entry;
int cmp = strcmp(packed->name, loose->name);
if (!cmp) {
packed = packed->next;
continue;
}
if (cmp > 0) {
entry = loose;
loose = loose->next;
} else {
entry = packed;
packed = packed->next;
}
retval = do_one_ref(base, fn, trim, cb_data, entry);
if (retval)
goto end_each;
}
for (packed = packed ? packed : loose; packed; packed = packed->next) {
retval = do_one_ref(base, fn, trim, cb_data, packed);
if (retval)
goto end_each;
}
end_each:
current_ref = NULL;
return retval;
}
int head_ref(each_ref_fn fn, void *cb_data)
{
unsigned char sha1[20];
int flag;
if (resolve_ref("HEAD", sha1, 1, &flag))
return fn("HEAD", sha1, flag, cb_data);
return 0;
}
int for_each_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/", fn, 0, cb_data);
}
int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/tags/", fn, 10, cb_data);
}
int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/heads/", fn, 11, cb_data);
}
int for_each_remote_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
}
/*
* Make sure "ref" is something reasonable to have under ".git/refs/";
* We do not like it if:
*
* - any path component of it begins with ".", or
* - it has double dots "..", or
* - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
* - it ends with a "/".
*/
static inline int bad_ref_char(int ch)
{
if (((unsigned) ch) <= ' ' ||
ch == '~' || ch == '^' || ch == ':')
return 1;
/* 2.13 Pattern Matching Notation */
if (ch == '?' || ch == '[') /* Unsupported */
return 1;
if (ch == '*') /* Supported at the end */
return 2;
return 0;
}
int check_ref_format(const char *ref)
{
int ch, level, bad_type;
const char *cp = ref;
level = 0;
while (1) {
while ((ch = *cp++) == '/')
; /* tolerate duplicated slashes */
if (!ch)
/* should not end with slashes */
return CHECK_REF_FORMAT_ERROR;
/* we are at the beginning of the path component */
if (ch == '.')
return CHECK_REF_FORMAT_ERROR;
bad_type = bad_ref_char(ch);
if (bad_type) {
return (bad_type == 2 && !*cp)
? CHECK_REF_FORMAT_WILDCARD
: CHECK_REF_FORMAT_ERROR;
}
/* scan the rest of the path component */
while ((ch = *cp++) != 0) {
bad_type = bad_ref_char(ch);
if (bad_type) {
return (bad_type == 2 && !*cp)
? CHECK_REF_FORMAT_WILDCARD
: CHECK_REF_FORMAT_ERROR;
}
if (ch == '/')
break;
if (ch == '.' && *cp == '.')
return CHECK_REF_FORMAT_ERROR;
}
level++;
if (!ch) {
if (level < 2)
return CHECK_REF_FORMAT_ONELEVEL;
return CHECK_REF_FORMAT_OK;
}
}
}
2007-11-11 14:01:46 +00:00
const char *ref_rev_parse_rules[] = {
"%.*s",
"refs/%.*s",
"refs/tags/%.*s",
"refs/heads/%.*s",
"refs/remotes/%.*s",
"refs/remotes/%.*s/HEAD",
NULL
};
2007-11-11 14:01:48 +00:00
const char *ref_fetch_rules[] = {
"%.*s",
"refs/%.*s",
"refs/heads/%.*s",
NULL
};
2007-11-11 14:01:46 +00:00
int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
{
const char **p;
const int abbrev_name_len = strlen(abbrev_name);
for (p = rules; *p; p++) {
if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
return 1;
}
}
return 0;
}
static struct ref_lock *verify_lock(struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist)
{
if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
error("Can't verify ref %s", lock->ref_name);
unlock_ref(lock);
return NULL;
}
if (hashcmp(lock->old_sha1, old_sha1)) {
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
error("Ref %s is at %s but expected %s", lock->ref_name,
sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
unlock_ref(lock);
return NULL;
}
return lock;
}
static int remove_empty_directories(const char *file)
{
/* we want to create a file but there is a directory there;
* if that is an empty directory (or a directory that contains
* only empty directories), remove them.
*/
struct strbuf path;
int result;
strbuf_init(&path, 20);
strbuf_addstr(&path, file);
result = remove_dir_recursively(&path, 1);
strbuf_release(&path);
return result;
}
static int is_refname_available(const char *ref, const char *oldref,
struct ref_list *list, int quiet)
{
int namlen = strlen(ref); /* e.g. 'foo/bar' */
while (list) {
/* list->name could be 'foo' or 'foo/bar/baz' */
if (!oldref || strcmp(oldref, list->name)) {
int len = strlen(list->name);
int cmplen = (namlen < len) ? namlen : len;
const char *lead = (namlen < len) ? list->name : ref;
if (!strncmp(ref, list->name, cmplen) &&
lead[cmplen] == '/') {
if (!quiet)
error("'%s' exists; cannot create '%s'",
list->name, ref);
return 0;
}
}
list = list->next;
}
return 1;
}
static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
{
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
char *ref_file;
const char *orig_ref = ref;
struct ref_lock *lock;
struct stat st;
int last_errno = 0;
int type;
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
lock = xcalloc(1, sizeof(struct ref_lock));
lock->lock_fd = -1;
ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
if (!ref && errno == EISDIR) {
/* we are trying to lock foo but we used to
* have foo/bar which now does not exist;
* it is normal for the empty directory 'foo'
* to remain.
*/
ref_file = git_path("%s", orig_ref);
if (remove_empty_directories(ref_file)) {
last_errno = errno;
error("there are still refs under '%s'", orig_ref);
goto error_return;
}
ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
}
if (type_p)
*type_p = type;
if (!ref) {
last_errno = errno;
error("unable to resolve reference %s: %s",
orig_ref, strerror(errno));
goto error_return;
}
/* When the ref did not exist and we are creating it,
* make sure there is no existing ref that is packed
* whose name begins with our refname, nor a ref whose
* name is a proper prefix of our refname.
*/
if (is_null_sha1(lock->old_sha1) &&
!is_refname_available(ref, NULL, get_packed_refs(), 0))
goto error_return;
lock->lk = xcalloc(1, sizeof(struct lock_file));
if (flags & REF_NODEREF)
ref = orig_ref;
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
lock->ref_name = xstrdup(ref);
lock->orig_ref_name = xstrdup(orig_ref);
ref_file = git_path("%s", ref);
if (lstat(ref_file, &st) && errno == ENOENT)
lock->force_write = 1;
if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
lock->force_write = 1;
if (safe_create_leading_directories(ref_file)) {
last_errno = errno;
error("unable to create directory for %s", ref_file);
goto error_return;
}
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
error_return:
unlock_ref(lock);
errno = last_errno;
return NULL;
}
struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
{
char refpath[PATH_MAX];
if (check_ref_format(ref))
return NULL;
strcpy(refpath, mkpath("refs/%s", ref));
return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
}
struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
{
switch (check_ref_format(ref)) {
default:
return NULL;
case 0:
case CHECK_REF_FORMAT_ONELEVEL:
return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
}
}
static struct lock_file packlock;
static int repack_without_ref(const char *refname)
{
struct ref_list *list, *packed_ref_list;
int fd;
int found = 0;
packed_ref_list = get_packed_refs();
for (list = packed_ref_list; list; list = list->next) {
if (!strcmp(refname, list->name)) {
found = 1;
break;
}
}
if (!found)
return 0;
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
if (fd < 0)
return error("cannot delete '%s' from packed refs", refname);
for (list = packed_ref_list; list; list = list->next) {
char line[PATH_MAX + 100];
int len;
if (!strcmp(refname, list->name))
continue;
len = snprintf(line, sizeof(line), "%s %s\n",
sha1_to_hex(list->sha1), list->name);
/* this should not happen but just being defensive */
if (len > sizeof(line))
die("too long a refname '%s'", list->name);
write_or_die(fd, line, len);
}
return commit_lock_file(&packlock);
}
int delete_ref(const char *refname, const unsigned char *sha1)
{
struct ref_lock *lock;
int err, i, ret = 0, flag = 0;
lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
if (!lock)
return 1;
if (!(flag & REF_ISPACKED)) {
/* loose */
i = strlen(lock->lk->filename) - 5; /* .lock */
lock->lk->filename[i] = 0;
err = unlink(lock->lk->filename);
if (err && errno != ENOENT) {
ret = 1;
error("unlink(%s) failed: %s",
lock->lk->filename, strerror(errno));
}
lock->lk->filename[i] = '.';
}
/* removing the loose one could have resurrected an earlier
* packed one. Also, if it was not loose we need to repack
* without it.
*/
ret |= repack_without_ref(refname);
err = unlink(git_path("logs/%s", lock->ref_name));
if (err && errno != ENOENT)
fprintf(stderr, "warning: unlink(%s) failed: %s",
git_path("logs/%s", lock->ref_name), strerror(errno));
invalidate_cached_refs();
unlock_ref(lock);
return ret;
}
int rename_ref(const char *oldref, const char *newref, const char *logmsg)
{
static const char renamed_ref[] = "RENAMED-REF";
unsigned char sha1[20], orig_sha1[20];
int flag = 0, logmoved = 0;
struct ref_lock *lock;
struct stat loginfo;
int log = !lstat(git_path("logs/%s", oldref), &loginfo);
if (S_ISLNK(loginfo.st_mode))
return error("reflog for %s is a symlink", oldref);
if (!resolve_ref(oldref, orig_sha1, 1, &flag))
return error("refname %s not found", oldref);
if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
return 1;
if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
return 1;
lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
if (!lock)
return error("unable to lock %s", renamed_ref);
lock->force_write = 1;
if (write_ref_sha1(lock, orig_sha1, logmsg))
return error("unable to save current sha1 in %s", renamed_ref);
if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
oldref, strerror(errno));
if (delete_ref(oldref, orig_sha1)) {
error("unable to delete old %s", oldref);
goto rollback;
}
if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
if (errno==EISDIR) {
if (remove_empty_directories(git_path("%s", newref))) {
error("Directory not empty: %s", newref);
goto rollback;
}
} else {
error("unable to delete existing %s", newref);
goto rollback;
}
}
if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
error("unable to create directory for %s", newref);
goto rollback;
}
retry:
if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
if (errno==EISDIR || errno==ENOTDIR) {
/*
* rename(a, b) when b is an existing
* directory ought to result in ISDIR, but
* Solaris 5.8 gives ENOTDIR. Sheesh.
*/
if (remove_empty_directories(git_path("logs/%s", newref))) {
error("Directory not empty: logs/%s", newref);
goto rollback;
}
goto retry;
} else {
error("unable to move logfile tmp-renamed-log to logs/%s: %s",
newref, strerror(errno));
goto rollback;
}
}
logmoved = log;
lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for update", newref);
goto rollback;
}
lock->force_write = 1;
hashcpy(lock->old_sha1, orig_sha1);
if (write_ref_sha1(lock, orig_sha1, logmsg)) {
error("unable to write current sha1 into %s", newref);
goto rollback;
}
return 0;
rollback:
lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for rollback", oldref);
goto rollbacklog;
}
lock->force_write = 1;
flag = log_all_ref_updates;
log_all_ref_updates = 0;
if (write_ref_sha1(lock, orig_sha1, NULL))
error("unable to write current sha1 into %s", oldref);
log_all_ref_updates = flag;
rollbacklog:
if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
error("unable to restore logfile %s from %s: %s",
oldref, newref, strerror(errno));
if (!logmoved && log &&
rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
error("unable to restore logfile %s from tmp-renamed-log: %s",
oldref, strerror(errno));
return 1;
}
int close_ref(struct ref_lock *lock)
{
if (close_lock_file(lock->lk))
return -1;
lock->lock_fd = -1;
return 0;
}
int commit_ref(struct ref_lock *lock)
{
if (commit_lock_file(lock->lk))
return -1;
lock->lock_fd = -1;
return 0;
}
void unlock_ref(struct ref_lock *lock)
{
/* Do not free lock->lk -- atexit() still looks at them */
if (lock->lk)
rollback_lock_file(lock->lk);
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
free(lock->ref_name);
free(lock->orig_ref_name);
free(lock);
}
/*
* copy the reflog message msg to buf, which has been allocated sufficiently
* large, while cleaning up the whitespaces. Especially, convert LF to space,
* because reflog file is one line per entry.
*/
static int copy_msg(char *buf, const char *msg)
{
char *cp = buf;
char c;
int wasspace = 1;
*cp++ = '\t';
while ((c = *msg++)) {
if (wasspace && isspace(c))
continue;
wasspace = isspace(c);
if (wasspace)
c = ' ';
*cp++ = c;
}
while (buf < cp && isspace(cp[-1]))
cp--;
*cp++ = '\n';
return cp - buf;
}
static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
const unsigned char *new_sha1, const char *msg)
{
int logfd, written, oflags = O_APPEND | O_WRONLY;
unsigned maxlen, len;
int msglen;
char *log_file, *logrec;
const char *committer;
2007-01-07 09:35:34 +00:00
if (log_all_ref_updates < 0)
log_all_ref_updates = !is_bare_repository();
2007-01-07 09:35:34 +00:00
log_file = git_path("logs/%s", ref_name);
if (log_all_ref_updates &&
(!prefixcmp(ref_name, "refs/heads/") ||
!prefixcmp(ref_name, "refs/remotes/") ||
!strcmp(ref_name, "HEAD"))) {
if (safe_create_leading_directories(log_file) < 0)
return error("unable to create directory for %s",
log_file);
oflags |= O_CREAT;
}
logfd = open(log_file, oflags, 0666);
if (logfd < 0) {
2006-10-10 04:15:59 +00:00
if (!(oflags & O_CREAT) && errno == ENOENT)
return 0;
if ((oflags & O_CREAT) && errno == EISDIR) {
if (remove_empty_directories(log_file)) {
return error("There are still logs under '%s'",
log_file);
}
logfd = open(log_file, oflags, 0666);
}
if (logfd < 0)
return error("Unable to append to %s: %s",
log_file, strerror(errno));
}
adjust_shared_perm(log_file);
msglen = msg ? strlen(msg) : 0;
Re-fix "builtin-commit: fix --signoff" An earlier fix to the said commit was incomplete; it mixed up the meaning of the flag parameter passed to the internal fmt_ident() function, so this corrects it. git_author_info() and git_committer_info() can be told to issue a warning when no usable user information is found, and optionally can be told to error out. Operations that actually use the information to record a new commit or a tag will still error out, but the caller to leave reflog record will just silently use bogus user information. Not warning on misconfigured user information while writing a reflog entry is somewhat debatable, but it is probably nicer to the users to silently let it pass, because the only information you are losing is who checked out the branch. * git_author_info() and git_committer_info() used to take 1 (positive int) to error out with a warning on misconfiguration; this is now signalled with a symbolic constant IDENT_ERROR_ON_NO_NAME. * These functions used to take -1 (negative int) to warn but continue; this is now signalled with a symbolic constant IDENT_WARN_ON_NO_NAME. * fmt_ident() function implements the above error reporting behaviour common to git_author_info() and git_committer_info(). A symbolic constant IDENT_NO_DATE can be or'ed in to the flag parameter to make it return only the "Name <email@address.xz>". * fmt_name() is a thin wrapper around fmt_ident() that always passes IDENT_ERROR_ON_NO_NAME and IDENT_NO_DATE. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-12-09 01:32:08 +00:00
committer = git_committer_info(0);
maxlen = strlen(committer) + msglen + 100;
logrec = xmalloc(maxlen);
len = sprintf(logrec, "%s %s %s\n",
sha1_to_hex(old_sha1),
sha1_to_hex(new_sha1),
committer);
if (msglen)
len += copy_msg(logrec + len - 1, msg) - 1;
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
free(logrec);
if (close(logfd) != 0 || written != len)
return error("Unable to append to %s", log_file);
return 0;
}
static int is_branch(const char *refname)
{
return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
}
int write_ref_sha1(struct ref_lock *lock,
const unsigned char *sha1, const char *logmsg)
{
static char term = '\n';
struct object *o;
if (!lock)
return -1;
if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
unlock_ref(lock);
return 0;
}
o = parse_object(sha1);
if (!o) {
error("Trying to write ref %s with nonexistant object %s",
lock->ref_name, sha1_to_hex(sha1));
unlock_ref(lock);
return -1;
}
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
error("Trying to write non-commit object %s to branch %s",
sha1_to_hex(sha1), lock->ref_name);
unlock_ref(lock);
return -1;
}
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
write_in_full(lock->lock_fd, &term, 1) != 1
|| close_ref(lock) < 0) {
error("Couldn't write %s", lock->lk->filename);
unlock_ref(lock);
return -1;
}
invalidate_cached_refs();
if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
(strcmp(lock->ref_name, lock->orig_ref_name) &&
log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
unlock_ref(lock);
return -1;
}
if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
/*
* Special hack: If a branch is updated directly and HEAD
* points to it (may happen on the remote side of a push
* for example) then logically the HEAD reflog should be
* updated too.
* A generic solution implies reverse symref information,
* but finding all symrefs pointing to the given branch
* would be rather costly for this rare event (the direct
* update of a branch) to be worth it. So let's cheat and
* check with HEAD only which should cover 99% of all usage
* scenarios (even 100% of the default ones).
*/
unsigned char head_sha1[20];
int head_flag;
const char *head_ref;
head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
if (head_ref && (head_flag & REF_ISSYMREF) &&
!strcmp(head_ref, lock->ref_name))
log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
}
if (commit_ref(lock)) {
Enable the packed refs file format This actually "turns on" the packed ref file format, now that the infrastructure to do so sanely exists (ie notably the change to make the reference reading logic take refnames rather than pathnames to the loose objects that no longer necessarily even exist). In particular, when the ref lookup hits a refname that has no loose file associated with it, it falls back on the packed-ref information. Also, the ref-locking code, while still using a loose file for the locking itself (and _creating_ a loose file for the new ref) no longer requires that the old ref be in such an unpacked state. Finally, this does a minimal hack to git-checkout.sh to rather than check the ref-file directly, do a "git-rev-parse" on the "heads/$refname". That's not really wonderful - we should rather really have a special routine to verify the names as proper branch head names, but it is a workable solution for now. With this, I can literally do something like git pack-refs find .git/refs -type f -print0 | xargs -0 rm -f -- and the end result is a largely working repository (ie I've done two commits - which creates _one_ unpacked ref file - done things like run "gitk" and "git log" etc, and it all looks ok). There are probably things missing, but I'm hoping that the missing things are now of the "small and obvious" kind, and that somebody else might want to start looking at this too. Hint hint ;) Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-14 17:14:47 +00:00
error("Couldn't set %s", lock->ref_name);
unlock_ref(lock);
return -1;
}
unlock_ref(lock);
return 0;
}
int create_symref(const char *ref_target, const char *refs_heads_master,
const char *logmsg)
{
const char *lockpath;
char ref[1000];
int fd, len, written;
char *git_HEAD = xstrdup(git_path("%s", ref_target));
unsigned char old_sha1[20], new_sha1[20];
if (logmsg && read_ref(ref_target, old_sha1))
hashclr(old_sha1);
if (safe_create_leading_directories(git_HEAD) < 0)
return error("unable to create directory for %s", git_HEAD);
#ifndef NO_SYMLINK_HEAD
if (prefer_symlink_refs) {
unlink(git_HEAD);
if (!symlink(refs_heads_master, git_HEAD))
goto done;
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
}
#endif
len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
if (sizeof(ref) <= len) {
error("refname too long: %s", refs_heads_master);
goto error_free_return;
}
lockpath = mkpath("%s.lock", git_HEAD);
fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
if (fd < 0) {
error("Unable to open %s for writing", lockpath);
goto error_free_return;
}
written = write_in_full(fd, ref, len);
if (close(fd) != 0 || written != len) {
error("Unable to write to %s", lockpath);
goto error_unlink_return;
}
if (rename(lockpath, git_HEAD) < 0) {
error("Unable to create %s", git_HEAD);
goto error_unlink_return;
}
if (adjust_shared_perm(git_HEAD)) {
error("Unable to fix permissions on %s", lockpath);
error_unlink_return:
unlink(lockpath);
error_free_return:
free(git_HEAD);
return -1;
}
#ifndef NO_SYMLINK_HEAD
done:
#endif
if (logmsg && !read_ref(refs_heads_master, new_sha1))
log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
free(git_HEAD);
return 0;
}
static char *ref_msg(const char *line, const char *endp)
{
const char *ep;
line += 82;
ep = memchr(line, '\n', endp - line);
if (!ep)
ep = endp;
return xmemdupz(line, ep - line);
}
int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
{
const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
char *tz_c;
int logfd, tz, reccnt = 0;
struct stat st;
unsigned long date;
unsigned char logged_sha1[20];
void *log_mapped;
size_t mapsz;
logfile = git_path("logs/%s", ref);
logfd = open(logfile, O_RDONLY, 0);
if (logfd < 0)
die("Unable to read log %s: %s", logfile, strerror(errno));
fstat(logfd, &st);
if (!st.st_size)
die("Log %s is empty.", logfile);
mapsz = xsize_t(st.st_size);
log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
logdata = log_mapped;
close(logfd);
lastrec = NULL;
rec = logend = logdata + st.st_size;
while (logdata < rec) {
reccnt++;
if (logdata < rec && *(rec-1) == '\n')
rec--;
lastgt = NULL;
while (logdata < rec && *(rec-1) != '\n') {
rec--;
if (*rec == '>')
lastgt = rec;
}
if (!lastgt)
die("Log %s is corrupt.", logfile);
date = strtoul(lastgt + 1, &tz_c, 10);
if (date <= at_time || cnt == 0) {
show-branch --reflog: show the reflog message at the top. This changes the output so the list at the top shows the reflog message, along with their relative timestamps. You can use --reflog=<n> to show <n> most recent log entries, or use --reflog=<n>,<b> to show <n> entries going back from the entry <b>. <b> can be either a number (so --reflog=4,20 shows 4 records starting from @{20}) or a timestamp (e.g. --reflog='4,1 day'). Here is a sample output (with --list option): $ git show-branch --reflog=10 --list jc/show-reflog [jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref [jc/show-reflog@{1}] (5 minutes ago) reset HEAD^ [jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog: sho [jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog: sho [jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow retrievi [jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4 [jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --reflog: use This shows what I did more cleanly: $ git show-branch --reflog=10 jc/show-reflog ! [jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref ! [jc/show-reflog@{1}] (5 minutes ago) reset HEAD^ ! [jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog: ! [jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog: ! [jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_ ! [jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read ! [jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend rea ! [jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow ! [jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4 ! [jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --r ---------- + [jc/show-reflog@{0}] show-branch --reflog: show the reflog + [jc/show-reflog@{2}] show-branch --reflog: show the reflog +++ [jc/show-reflog@{1}] show-branch --reflog: show the reflog +++++ [jc/show-reflog@{4}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{5}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{6}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{7}] read_ref_at(): allow retrieving the r + [jc/show-reflog@{9}] show-branch --reflog: use updated rea + [jc/show-reflog@{9}^] read_ref_at(): allow reporting the c + [jc/show-reflog@{9}~2] show-branch --reflog: show the refl + [jc/show-reflog@{9}~3] read_ref_at(): allow retrieving the ++++++++++ [jc/show-reflog@{8}] dwim_ref(): Separate name-to-ref DWIM At @{9}, I had a commit to complete 5 patch series, but I wanted to consolidate two commits that enhances read_ref_at() into one (they were @{9}^ and @{9}~3), and another two that touch show-branch into one (@{9} and @{9}~2). I first saved them with "format-patch -4", and then did a reset at @{8}. At @{7}, I applied one of them with "am", and then used "git-apply" on the other one, and amended the commit at @{6} (so @{6} and @{7} has the same parent). I did not like the log message, so I amended again at @{5}. Then I cherry-picked @{9}~2 to create @{3} (the log message shows that it needs to learn to set GIT_REFLOG_ACTION -- it uses "git-commit" and the log entry is attributed for it). Another cherry-pick built @{2} out of @{9}, but what I wanted to do was to squash these two into one, so I did a "reset HEAD^" at @{1} and then made the final commit by amending what was at the top. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-19 09:20:23 +00:00
tz = strtoul(tz_c, NULL, 10);
if (msg)
*msg = ref_msg(rec, logend);
if (cutoff_time)
*cutoff_time = date;
if (cutoff_tz)
*cutoff_tz = tz;
if (cutoff_cnt)
show-branch --reflog: show the reflog message at the top. This changes the output so the list at the top shows the reflog message, along with their relative timestamps. You can use --reflog=<n> to show <n> most recent log entries, or use --reflog=<n>,<b> to show <n> entries going back from the entry <b>. <b> can be either a number (so --reflog=4,20 shows 4 records starting from @{20}) or a timestamp (e.g. --reflog='4,1 day'). Here is a sample output (with --list option): $ git show-branch --reflog=10 --list jc/show-reflog [jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref [jc/show-reflog@{1}] (5 minutes ago) reset HEAD^ [jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog: sho [jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog: sho [jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend read_ref_a [jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow retrievi [jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4 [jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --reflog: use This shows what I did more cleanly: $ git show-branch --reflog=10 jc/show-reflog ! [jc/show-reflog@{0}] (3 minutes ago) commit (amend): show-branch --ref ! [jc/show-reflog@{1}] (5 minutes ago) reset HEAD^ ! [jc/show-reflog@{2}] (14 minutes ago) commit: show-branch --reflog: ! [jc/show-reflog@{3}] (14 minutes ago) commit: show-branch --reflog: ! [jc/show-reflog@{4}] (18 minutes ago) commit (amend): Extend read_ ! [jc/show-reflog@{5}] (18 minutes ago) commit (amend): Extend read ! [jc/show-reflog@{6}] (18 minutes ago) commit (amend): Extend rea ! [jc/show-reflog@{7}] (18 minutes ago) am: read_ref_at(): allow ! [jc/show-reflog@{8}] (18 minutes ago) reset --hard HEAD~4 ! [jc/show-reflog@{9}] (61 minutes ago) commit: show-branch --r ---------- + [jc/show-reflog@{0}] show-branch --reflog: show the reflog + [jc/show-reflog@{2}] show-branch --reflog: show the reflog +++ [jc/show-reflog@{1}] show-branch --reflog: show the reflog +++++ [jc/show-reflog@{4}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{5}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{6}] Extend read_ref_at() to be usable fro + [jc/show-reflog@{7}] read_ref_at(): allow retrieving the r + [jc/show-reflog@{9}] show-branch --reflog: use updated rea + [jc/show-reflog@{9}^] read_ref_at(): allow reporting the c + [jc/show-reflog@{9}~2] show-branch --reflog: show the refl + [jc/show-reflog@{9}~3] read_ref_at(): allow retrieving the ++++++++++ [jc/show-reflog@{8}] dwim_ref(): Separate name-to-ref DWIM At @{9}, I had a commit to complete 5 patch series, but I wanted to consolidate two commits that enhances read_ref_at() into one (they were @{9}^ and @{9}~3), and another two that touch show-branch into one (@{9} and @{9}~2). I first saved them with "format-patch -4", and then did a reset at @{8}. At @{7}, I applied one of them with "am", and then used "git-apply" on the other one, and amended the commit at @{6} (so @{6} and @{7} has the same parent). I did not like the log message, so I amended again at @{5}. Then I cherry-picked @{9}~2 to create @{3} (the log message shows that it needs to learn to set GIT_REFLOG_ACTION -- it uses "git-commit" and the log entry is attributed for it). Another cherry-pick built @{2} out of @{9}, but what I wanted to do was to squash these two into one, so I did a "reset HEAD^" at @{1} and then made the final commit by amending what was at the top. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-19 09:20:23 +00:00
*cutoff_cnt = reccnt - 1;
if (lastrec) {
if (get_sha1_hex(lastrec, logged_sha1))
die("Log %s is corrupt.", logfile);
if (get_sha1_hex(rec + 41, sha1))
die("Log %s is corrupt.", logfile);
if (hashcmp(logged_sha1, sha1)) {
fprintf(stderr,
"warning: Log %s has gap after %s.\n",
logfile, show_date(date, tz, DATE_RFC2822));
}
}
else if (date == at_time) {
if (get_sha1_hex(rec + 41, sha1))
die("Log %s is corrupt.", logfile);
}
else {
if (get_sha1_hex(rec + 41, logged_sha1))
die("Log %s is corrupt.", logfile);
if (hashcmp(logged_sha1, sha1)) {
fprintf(stderr,
"warning: Log %s unexpectedly ended on %s.\n",
logfile, show_date(date, tz, DATE_RFC2822));
}
}
munmap(log_mapped, mapsz);
return 0;
}
lastrec = rec;
if (cnt > 0)
cnt--;
}
rec = logdata;
while (rec < logend && *rec != '>' && *rec != '\n')
rec++;
if (rec == logend || *rec == '\n')
die("Log %s is corrupt.", logfile);
date = strtoul(rec + 1, &tz_c, 10);
tz = strtoul(tz_c, NULL, 10);
if (get_sha1_hex(logdata, sha1))
die("Log %s is corrupt.", logfile);
if (is_null_sha1(sha1)) {
if (get_sha1_hex(logdata + 41, sha1))
die("Log %s is corrupt.", logfile);
}
if (msg)
*msg = ref_msg(logdata, logend);
munmap(log_mapped, mapsz);
if (cutoff_time)
*cutoff_time = date;
if (cutoff_tz)
*cutoff_tz = tz;
if (cutoff_cnt)
*cutoff_cnt = reccnt;
return 1;
}
int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
{
const char *logfile;
FILE *logfp;
char buf[1024];
int ret = 0;
logfile = git_path("logs/%s", ref);
logfp = fopen(logfile, "r");
if (!logfp)
return -1;
while (fgets(buf, sizeof(buf), logfp)) {
unsigned char osha1[20], nsha1[20];
char *email_end, *message;
unsigned long timestamp;
int len, tz;
/* old SP new SP name <email> SP time TAB msg LF */
len = strlen(buf);
if (len < 83 || buf[len-1] != '\n' ||
get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
!(email_end = strchr(buf + 82, '>')) ||
email_end[1] != ' ' ||
!(timestamp = strtoul(email_end + 2, &message, 10)) ||
!message || message[0] != ' ' ||
(message[1] != '+' && message[1] != '-') ||
!isdigit(message[2]) || !isdigit(message[3]) ||
!isdigit(message[4]) || !isdigit(message[5]))
continue; /* corrupt? */
email_end[1] = '\0';
tz = strtol(message + 1, NULL, 10);
if (message[6] != '\t')
message += 6;
else
message += 7;
ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
if (ret)
break;
}
fclose(logfp);
return ret;
}
static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
{
DIR *dir = opendir(git_path("logs/%s", base));
int retval = 0;
if (dir) {
struct dirent *de;
int baselen = strlen(base);
char *log = xmalloc(baselen + 257);
memcpy(log, base, baselen);
if (baselen && base[baselen-1] != '/')
log[baselen++] = '/';
while ((de = readdir(dir)) != NULL) {
struct stat st;
int namelen;
if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if (namelen > 255)
continue;
if (has_extension(de->d_name, ".lock"))
continue;
memcpy(log + baselen, de->d_name, namelen+1);
if (stat(git_path("logs/%s", log), &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
retval = do_for_each_reflog(log, fn, cb_data);
} else {
unsigned char sha1[20];
if (!resolve_ref(log, sha1, 0, NULL))
retval = error("bad ref for %s", log);
else
retval = fn(log, sha1, 0, cb_data);
}
if (retval)
break;
}
free(log);
closedir(dir);
}
else if (*base)
return errno;
return retval;
}
int for_each_reflog(each_ref_fn fn, void *cb_data)
{
return do_for_each_reflog("", fn, cb_data);
}
int update_ref(const char *action, const char *refname,
const unsigned char *sha1, const unsigned char *oldval,
int flags, enum action_on_err onerr)
{
static struct ref_lock *lock;
lock = lock_any_ref_for_update(refname, oldval, flags);
if (!lock) {
const char *str = "Cannot lock the ref '%s'.";
switch (onerr) {
case MSG_ON_ERR: error(str, refname); break;
case DIE_ON_ERR: die(str, refname); break;
case QUIET_ON_ERR: break;
}
return 1;
}
if (write_ref_sha1(lock, sha1, action) < 0) {
const char *str = "Cannot update the ref '%s'.";
switch (onerr) {
case MSG_ON_ERR: error(str, refname); break;
case DIE_ON_ERR: die(str, refname); break;
case QUIET_ON_ERR: break;
}
return 1;
}
return 0;
}
struct ref *find_ref_by_name(struct ref *list, const char *name)
{
for ( ; list; list = list->next)
if (!strcmp(list->name, name))
return list;
return NULL;
}