From: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
Date: Thu, 1 May 2014 11:16:07 -0700
Change is_refname_available to take a list of strings to exclude when
checking for conflicts instead of just one single name. We can already
exclude a single name for the sake of renames. This generalizes that support.
ref_transaction_commit already tracks a set of refs that are being deleted
in an array. This array is then used to exclude refs from being written to
the packed-refs file. At some stage we will want to change this array to a
struct string_list and then we can pass it to is_refname_available via the
call to lock_ref_sha1_basic. That will allow us to perform transactions
that perform multiple renames as long as there are no conflicts within the
starting or ending state.
For example, that would allow a single transaction that contains two
renames that are both individually conflicting:
m -> n/n
n -> m/m
No functional change intended yet.
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
Since v21:
- clarified commit message
- clarified comments
refs.c | 44 +++++++++++++++++++++++++++++---------------
1 file changed, 29 insertions(+), 15 deletions(-)
diff --git a/refs.c b/refs.c
index f124c2b..6820c93 100644
--- a/refs.c
+++ b/refs.c
@@ -801,14 +801,16 @@ static int names_conflict(const char *refname1, const char *refname2)
struct name_conflict_cb {
const char *refname;
- const char *oldrefname;
const char *conflicting_refname;
+ struct string_list *skiplist;
};
static int name_conflict_fn(struct ref_entry *entry, void *cb_data)
{
struct name_conflict_cb *data = (struct name_conflict_cb *)cb_data;
- if (data->oldrefname && !strcmp(data->oldrefname, entry->name))
+
+ if (data->skiplist &&
+ string_list_has_string(data->skiplist, entry->name))
return 0;
if (names_conflict(data->refname, entry->name)) {
data->conflicting_refname = entry->name;
@@ -820,17 +822,18 @@ static int name_conflict_fn(struct ref_entry *entry, void *cb_data)
/*
* Return true iff a reference named refname could be created without
* conflicting with the name of an existing reference in dir. If
- * oldrefname is non-NULL, ignore potential conflicts with oldrefname
- * (e.g., because oldrefname is scheduled for deletion in the same
- * operation).
+ * skiplist is non-NULL, ignore potential conflicts with names in
+ * skiplist (e.g., because those refs are scheduled for deletion in
+ * the same operation). skiplist must be sorted.
*/
-static int is_refname_available(const char *refname, const char *oldrefname,
- struct ref_dir *dir)
+static int is_refname_available(const char *refname,
+ struct ref_dir *dir,
+ struct string_list *skiplist)
{
struct name_conflict_cb data;
data.refname = refname;
- data.oldrefname = oldrefname;
data.conflicting_refname = NULL;
+ data.skiplist = skiplist;
sort_ref_dir(dir);
if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) {
@@ -2080,6 +2083,7 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
*/
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
const unsigned char *old_sha1,
+ struct string_list *skiplist,
int flags, int *type_p)
{
char *ref_file;
@@ -2129,7 +2133,8 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
* name is a proper prefix of our refname.
*/
if (missing &&
- !is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) {
+ !is_refname_available(refname, get_packed_refs(&ref_cache),
+ skiplist)) {
last_errno = ENOTDIR;
goto error_return;
}
@@ -2187,7 +2192,7 @@ struct ref_lock *lock_any_ref_for_update(const char *refname,
const unsigned char *old_sha1,
int flags, int *type_p)
{
- return lock_ref_sha1_basic(refname, old_sha1, flags, type_p);
+ return lock_ref_sha1_basic(refname, old_sha1, NULL, flags, type_p);
}
/*
@@ -2648,6 +2653,7 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
struct stat loginfo;
int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
const char *symref = NULL;
+ struct string_list skiplist = STRING_LIST_INIT_NODUP;
if (log && S_ISLNK(loginfo.st_mode))
return error("reflog for %s is a symlink", oldrefname);
@@ -2659,11 +2665,18 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
if (!symref)
return error("refname %s not found", oldrefname);
- if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache)))
+ string_list_insert(&skiplist, oldrefname);
+ if (!is_refname_available(newrefname, get_packed_refs(&ref_cache),
+ &skiplist)) {
+ string_list_clear(&skiplist, 0);
return 1;
-
- if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache)))
+ }
+ if (!is_refname_available(newrefname, get_loose_refs(&ref_cache),
+ &skiplist)) {
+ string_list_clear(&skiplist, 0);
return 1;
+ }
+ string_list_clear(&skiplist, 0);
if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
@@ -2692,7 +2705,7 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
logmoved = log;
- lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
+ lock = lock_ref_sha1_basic(newrefname, NULL, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for update", newrefname);
goto rollback;
@@ -2707,7 +2720,7 @@ int rename_ref(const char *oldrefname, const char *newrefname, const char *logms
return 0;
rollback:
- lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
+ lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for rollback", oldrefname);
goto rollbacklog;
@@ -3582,6 +3595,7 @@ int ref_transaction_commit(struct ref_transaction *transaction,
(update->have_old ?
update->old_sha1 :
NULL),
+ NULL,
update->flags,
&update->type);
if (!update->lock) {
--
2.1.0.rc2.206.gedb03e5
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