SYNOPSIS
--------
-'git-update-ref' [-m <reason>] (-d <ref> <oldvalue> | <ref> <newvalue> [<oldvalue>])
+'git-update-ref' [-m <reason>] (-d <ref> <oldvalue> | [--no-deref] <ref> <newvalue> [<oldvalue>])
DESCRIPTION
-----------
filesystem to follow them, but will overwrite such a symlink to
somewhere else with a regular filename).
+If --no-deref is given, <ref> itself is overwritten, rather than
+the result of following the symbolic pointers.
+
In general, using
git-update-ref HEAD "$head"
die("Not a valid branch point: '%s'.", start_name);
hashcpy(sha1, commit->object.sha1);
- lock = lock_any_ref_for_update(ref, NULL);
+ lock = lock_any_ref_for_update(ref, NULL, 0);
if (!lock)
die("Failed to lock ref for update: %s.", strerror(errno));
if (!rla)
rla = "(reflog update)";
snprintf(msg, sizeof(msg), "%s: %s", rla, action);
- lock = lock_any_ref_for_update(refname, oldval);
+ lock = lock_any_ref_for_update(refname, oldval, 0);
if (!lock)
return 1;
if (write_ref_sha1(lock, sha1, msg) < 0)
/* we take the lock for the ref itself to prevent it from
* getting updated.
*/
- lock = lock_any_ref_for_update(ref, sha1);
+ lock = lock_any_ref_for_update(ref, sha1, 0);
if (!lock)
return error("cannot lock ref '%s'", ref);
log_file = xstrdup(git_path("logs/%s", ref));
#include "builtin.h"
static const char git_update_ref_usage[] =
-"git-update-ref [-m <reason>] (-d <refname> <value> | <refname> <value> [<oldval>])";
+"git-update-ref [-m <reason>] (-d <refname> <value> | [--no-deref] <refname> <value> [<oldval>])";
int cmd_update_ref(int argc, const char **argv, const char *prefix)
{
const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
struct ref_lock *lock;
unsigned char sha1[20], oldsha1[20];
- int i, delete;
+ int i, delete, ref_flags;
delete = 0;
+ ref_flags = 0;
git_config(git_default_config);
for (i = 1; i < argc; i++) {
delete = 1;
continue;
}
+ if (!strcmp("--no-deref", argv[i])) {
+ ref_flags |= REF_NODEREF;
+ continue;
+ }
if (!refname) {
refname = argv[i];
continue;
if (oldval && *oldval && get_sha1(oldval, oldsha1))
die("%s: not a valid old SHA1", oldval);
- lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL);
+ lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL, ref_flags);
if (!lock)
die("%s: cannot lock the ref", refname);
if (write_ref_sha1(lock, sha1, msg) < 0)
if (read_ref(b->name, old_sha1))
hashclr(old_sha1);
- lock = lock_any_ref_for_update(b->name, old_sha1);
+ lock = lock_any_ref_for_update(b->name, old_sha1, 0);
if (!lock)
return error("Unable to lock %s", b->name);
if (!force_update && !is_null_sha1(old_sha1)) {
fi
elif test -n "$detached"
then
- # NEEDSWORK: we would want a command to detach the HEAD
- # atomically, instead of this handcrafted command sequence.
- # Perhaps:
- # git update-ref --detach HEAD $new
- # or something like that...
- #
- git-rev-parse HEAD >"$GIT_DIR/HEAD.new" &&
- mv "$GIT_DIR/HEAD.new" "$GIT_DIR/HEAD" &&
- git-update-ref -m "checkout: moving to $arg" HEAD "$detached" ||
+ git-update-ref --no-deref -m "checkout: moving to $arg" HEAD "$detached" ||
die "Cannot detach HEAD"
if test -n "$detach_warn"
then
return NULL; /* good */
}
else {
- lock = lock_any_ref_for_update(name, old_sha1);
+ lock = lock_any_ref_for_update(name, old_sha1, 0);
if (!lock) {
error("failed to lock %s", name);
return "failed to lock";
return 1;
}
-static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
+static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
{
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, flag);
+ 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;
error("there are still refs under '%s'", orig_ref);
goto error_return;
}
- ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
+ 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",
lock->lk = xcalloc(1, sizeof(struct lock_file));
+ if (flags & REF_NODEREF)
+ ref = orig_ref;
lock->ref_name = xstrdup(ref);
lock->orig_ref_name = xstrdup(orig_ref);
ref_file = git_path("%s", ref);
- lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
+ 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;
if (check_ref_format(ref))
return NULL;
strcpy(refpath, mkpath("refs/%s", ref));
- return lock_ref_sha1_basic(refpath, old_sha1, NULL);
+ 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)
+struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
{
if (check_ref_format(ref) == -1)
return NULL;
- return lock_ref_sha1_basic(ref, old_sha1, NULL);
+ return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
}
static struct lock_file packlock;
struct ref_lock *lock;
int err, i, ret = 0, flag = 0;
- lock = lock_ref_sha1_basic(refname, sha1, &flag);
+ lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
if (!lock)
return 1;
if (!(flag & REF_ISPACKED)) {
if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
return 1;
- lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
+ lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
if (!lock)
return error("unable to lock %s", renamed_ref);
lock->force_write = 1;
}
logmoved = log;
- lock = lock_ref_sha1_basic(newref, NULL, NULL);
+ lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for update", newref);
goto rollback;
return 0;
rollback:
- lock = lock_ref_sha1_basic(oldref, NULL, NULL);
+ lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for rollback", oldref);
goto rollbacklog;
extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1);
/** Locks any ref (for 'HEAD' type refs). */
-extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1);
+#define REF_NODEREF 0x01
+extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags);
/** Release any lock taken but not written. **/
extern void unlock_ref(struct ref_lock *lock);