char *ref_name;
char *orig_ref_name;
struct lock_file *lk;
- unsigned char old_sha1[20];
+ struct object_id old_oid;
};
/*
* null. If REF_ISSYMREF, then this is the name of the object
* referred to by the last reference in the symlink chain.
*/
- unsigned char sha1[20];
+ struct object_id oid;
/*
* If REF_KNOWS_PEELED, then this field holds the peeled value
* be peelable. See the documentation for peel_ref() for an
* exact definition of "peelable".
*/
- unsigned char peeled[20];
+ struct object_id peeled;
};
struct ref_cache;
die("Reference has invalid format: '%s'", refname);
len = strlen(refname) + 1;
ref = xmalloc(sizeof(struct ref_entry) + len);
- hashcpy(ref->u.value.sha1, sha1);
- hashclr(ref->u.value.peeled);
+ hashcpy(ref->u.value.oid.hash, sha1);
+ oidclr(&ref->u.value.peeled);
memcpy(ref->name, refname, len);
ref->flag = flag;
return ref;
/* This is impossible by construction */
die("Reference directory conflict: %s", ref1->name);
- if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1))
+ if (oidcmp(&ref1->u.value.oid, &ref2->u.value.oid))
die("Duplicated ref, and SHA1s don't match: %s", ref1->name);
warning("Duplicated ref: %s", ref1->name);
{
if (entry->flag & REF_ISBROKEN)
return 0;
- if (!has_sha1_file(entry->u.value.sha1)) {
+ if (!has_sha1_file(entry->u.value.oid.hash)) {
error("%s does not point to a valid object!", entry->name);
return 0;
}
/* Store the old value, in case this is a recursive call: */
old_current_ref = current_ref;
current_ref = entry;
- retval = data->fn(entry->name + data->trim, entry->u.value.sha1,
+ retval = data->fn(entry->name + data->trim, &entry->u.value.oid,
entry->flag, data->cb_data);
current_ref = old_current_ref;
return retval;
line.len == PEELED_LINE_LENGTH &&
line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
!get_sha1_hex(line.buf + 1, sha1)) {
- hashcpy(last->u.value.peeled, sha1);
+ hashcpy(last->u.value.peeled.hash, sha1);
/*
* Regardless of what the file header said,
* we definitely know the value of *this*
return get_packed_ref_dir(get_packed_ref_cache(refs));
}
-void add_packed_ref(const char *refname, const unsigned char *sha1)
+/*
+ * Add a reference to the in-memory packed reference cache. This may
+ * only be called while the packed-refs file is locked (see
+ * lock_packed_refs()). To actually write the packed-refs file, call
+ * commit_packed_refs().
+ */
+static void add_packed_ref(const char *refname, const unsigned char *sha1)
{
struct packed_ref_cache *packed_ref_cache =
get_packed_ref_cache(&ref_cache);
create_dir_entry(refs, refname.buf,
refname.len, 1));
} else {
+ int read_ok;
+
if (*refs->name) {
hashclr(sha1);
flag = 0;
- if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) {
- hashclr(sha1);
- flag |= REF_ISBROKEN;
- }
- } else if (read_ref_full(refname.buf,
- RESOLVE_REF_READING,
- sha1, &flag)) {
+ read_ok = !resolve_gitlink_ref(refs->name,
+ refname.buf, sha1);
+ } else {
+ read_ok = !read_ref_full(refname.buf,
+ RESOLVE_REF_READING,
+ sha1, &flag);
+ }
+
+ if (!read_ok) {
hashclr(sha1);
flag |= REF_ISBROKEN;
+ } else if (is_null_sha1(sha1)) {
+ /*
+ * It is so astronomically unlikely
+ * that NULL_SHA1 is the SHA-1 of an
+ * actual object that we consider its
+ * appearance in a loose reference
+ * file to be repo corruption
+ * (probably due to a software bug).
+ */
+ flag |= REF_ISBROKEN;
}
+
if (check_refname_format(refname.buf,
REFNAME_ALLOW_ONELEVEL)) {
if (!refname_is_safe(refname.buf))
if (ref == NULL)
return -1;
- hashcpy(sha1, ref->u.value.sha1);
+ hashcpy(sha1, ref->u.value.oid.hash);
return 0;
}
*/
entry = get_packed_ref(refname);
if (entry) {
- hashcpy(sha1, entry->u.value.sha1);
+ hashcpy(sha1, entry->u.value.oid.hash);
if (flags)
*flags |= REF_ISPACKED;
return 0;
return ret;
}
-char *resolve_refdup(const char *ref, int resolve_flags, unsigned char *sha1, int *flags)
+char *resolve_refdup(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags)
{
- return xstrdup_or_null(resolve_ref_unsafe(ref, resolve_flags, sha1, flags));
+ return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
+ sha1, flags));
}
/* The argument to filter_refs */
return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
}
-static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
- void *data)
+static int filter_refs(const char *refname, const struct object_id *oid,
+ int flags, void *data)
{
struct ref_filter *filter = (struct ref_filter *)data;
+
if (wildmatch(filter->pattern, refname, 0, NULL))
return 0;
- return filter->fn(refname, sha1, flags, filter->cb_data);
+ return filter->fn(refname, oid, flags, filter->cb_data);
}
enum peel_status {
if (entry->flag & REF_KNOWS_PEELED) {
if (repeel) {
entry->flag &= ~REF_KNOWS_PEELED;
- hashclr(entry->u.value.peeled);
+ oidclr(&entry->u.value.peeled);
} else {
- return is_null_sha1(entry->u.value.peeled) ?
+ return is_null_oid(&entry->u.value.peeled) ?
PEEL_NON_TAG : PEEL_PEELED;
}
}
if (entry->flag & REF_ISSYMREF)
return PEEL_IS_SYMREF;
- status = peel_object(entry->u.value.sha1, entry->u.value.peeled);
+ status = peel_object(entry->u.value.oid.hash, entry->u.value.peeled.hash);
if (status == PEEL_PEELED || status == PEEL_NON_TAG)
entry->flag |= REF_KNOWS_PEELED;
return status;
|| !strcmp(current_ref->name, refname))) {
if (peel_entry(current_ref, 0))
return -1;
- hashcpy(sha1, current_ref->u.value.peeled);
+ hashcpy(sha1, current_ref->u.value.peeled.hash);
return 0;
}
if (r) {
if (peel_entry(r, 0))
return -1;
- hashcpy(sha1, r->u.value.peeled);
+ hashcpy(sha1, r->u.value.peeled.hash);
return 0;
}
}
const char *msg_fmt;
};
-static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
+static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
int flags, void *cb_data)
{
struct warn_if_dangling_data *d = cb_data;
const char *resolves_to;
- unsigned char junk[20];
+ struct object_id junk;
if (!(flags & REF_ISSYMREF))
return 0;
- resolves_to = resolve_ref_unsafe(refname, 0, junk, NULL);
+ resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
if (!resolves_to
|| (d->refname
? strcmp(resolves_to, d->refname)
static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
{
- unsigned char sha1[20];
+ struct object_id oid;
int flag;
if (submodule) {
- if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
- return fn("HEAD", sha1, 0, cb_data);
+ if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
+ return fn("HEAD", &oid, 0, cb_data);
return 0;
}
- if (!read_ref_full("HEAD", RESOLVE_REF_READING, sha1, &flag))
- return fn("HEAD", sha1, flag, cb_data);
+ if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
+ return fn("HEAD", &oid, flag, cb_data);
return 0;
}
{
struct strbuf buf = STRBUF_INIT;
int ret = 0;
- unsigned char sha1[20];
+ struct object_id oid;
int flag;
strbuf_addf(&buf, "%sHEAD", get_git_namespace());
- if (!read_ref_full(buf.buf, RESOLVE_REF_READING, sha1, &flag))
- ret = fn(buf.buf, sha1, flag, cb_data);
+ if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
+ ret = fn(buf.buf, &oid, flag, cb_data);
strbuf_release(&buf);
return ret;
free(lock);
}
-/* This function should make sure errno is meaningful on error */
-static struct ref_lock *verify_lock(struct ref_lock *lock,
- const unsigned char *old_sha1, int mustexist)
+/*
+ * Verify that the reference locked by lock has the value old_sha1.
+ * Fail if the reference doesn't exist and mustexist is set. Return 0
+ * on success. On error, write an error message to err, set errno, and
+ * return a negative value.
+ */
+static int verify_lock(struct ref_lock *lock,
+ const unsigned char *old_sha1, int mustexist,
+ struct strbuf *err)
{
+ assert(err);
+
if (read_ref_full(lock->ref_name,
mustexist ? RESOLVE_REF_READING : 0,
- lock->old_sha1, NULL)) {
+ lock->old_oid.hash, NULL)) {
int save_errno = errno;
- error("Can't verify ref %s", lock->ref_name);
- unlock_ref(lock);
+ strbuf_addf(err, "can't verify ref %s", lock->ref_name);
errno = save_errno;
- return NULL;
+ return -1;
}
- if (hashcmp(lock->old_sha1, old_sha1)) {
- 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);
+ if (hashcmp(lock->old_oid.hash, old_sha1)) {
+ strbuf_addf(err, "ref %s is at %s but expected %s",
+ lock->ref_name,
+ sha1_to_hex(lock->old_oid.hash),
+ sha1_to_hex(old_sha1));
errno = EBUSY;
- return NULL;
+ return -1;
}
- return lock;
+ return 0;
}
static int remove_empty_directories(const char *file)
}
refname = resolve_ref_unsafe(refname, resolve_flags,
- lock->old_sha1, &type);
+ lock->old_oid.hash, &type);
if (!refname && errno == EISDIR) {
/* we are trying to lock foo but we used to
* have foo/bar which now does not exist;
goto error_return;
}
refname = resolve_ref_unsafe(orig_refname, resolve_flags,
- lock->old_sha1, &type);
+ lock->old_oid.hash, &type);
}
if (type_p)
*type_p = type;
* refname, nor a packed ref whose name is a proper prefix of
* our refname.
*/
- if (is_null_sha1(lock->old_sha1) &&
+ if (is_null_oid(&lock->old_oid) &&
verify_refname_available(refname, extras, skip,
get_packed_refs(&ref_cache), err)) {
last_errno = ENOTDIR;
goto error_return;
}
}
- return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
+ if (old_sha1 && verify_lock(lock, old_sha1, mustexist, err)) {
+ last_errno = errno;
+ goto error_return;
+ }
+ return lock;
error_return:
unlock_ref(lock);
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
error("internal error: %s is not a valid packed reference!",
entry->name);
- write_packed_entry(cb_data, entry->name, entry->u.value.sha1,
+ write_packed_entry(cb_data, entry->name, entry->u.value.oid.hash,
peel_status == PEEL_PEELED ?
- entry->u.value.peeled : NULL);
+ entry->u.value.peeled.hash : NULL);
return 0;
}
-/* This should return a meaningful errno on failure */
-int lock_packed_refs(int flags)
+/*
+ * Lock the packed-refs file for writing. Flags is passed to
+ * hold_lock_file_for_update(). Return 0 on success. On errors, set
+ * errno appropriately and return a nonzero value.
+ */
+static int lock_packed_refs(int flags)
{
static int timeout_configured = 0;
static int timeout_value = 1000;
}
/*
- * Commit the packed refs changes.
- * On error we must make sure that errno contains a meaningful value.
+ * Write the current version of the packed refs cache from memory to
+ * disk. The packed-refs file must already be locked for writing (see
+ * lock_packed_refs()). Return zero on success. On errors, set errno
+ * and return a nonzero value
*/
-int commit_packed_refs(void)
+static int commit_packed_refs(void)
{
struct packed_ref_cache *packed_ref_cache =
get_packed_ref_cache(&ref_cache);
return error;
}
-void rollback_packed_refs(void)
+/*
+ * Rollback the lockfile for the packed-refs file, and discard the
+ * in-memory packed reference cache. (The packed-refs file will be
+ * read anew if it is needed again after this function is called.)
+ */
+static void rollback_packed_refs(void)
{
struct packed_ref_cache *packed_ref_cache =
get_packed_ref_cache(&ref_cache);
peel_status = peel_entry(entry, 1);
if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG)
die("internal error peeling reference %s (%s)",
- entry->name, sha1_to_hex(entry->u.value.sha1));
+ entry->name, oid_to_hex(&entry->u.value.oid));
packed_entry = find_ref(cb->packed_refs, entry->name);
if (packed_entry) {
/* Overwrite existing packed entry with info from loose entry */
packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED;
- hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1);
+ oidcpy(&packed_entry->u.value.oid, &entry->u.value.oid);
} else {
- packed_entry = create_ref_entry(entry->name, entry->u.value.sha1,
+ packed_entry = create_ref_entry(entry->name, entry->u.value.oid.hash,
REF_ISPACKED | REF_KNOWS_PEELED, 0);
add_ref(cb->packed_refs, packed_entry);
}
- hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled);
+ oidcpy(&packed_entry->u.value.peeled, &entry->u.value.peeled);
/* Schedule the loose reference for pruning if requested. */
if ((cb->flags & PACK_REFS_PRUNE)) {
int namelen = strlen(entry->name) + 1;
struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
- hashcpy(n->sha1, entry->u.value.sha1);
+ hashcpy(n->sha1, entry->u.value.oid.hash);
strcpy(n->name, entry->name);
n->next = cb->ref_to_prune;
cb->ref_to_prune = n;
return 0;
}
-int repack_without_refs(struct string_list *refnames, struct strbuf *err)
+/*
+ * Rewrite the packed-refs file, omitting any refs listed in
+ * 'refnames'. On error, leave packed-refs unchanged, write an error
+ * message to 'err', and return a nonzero value.
+ *
+ * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
+ */
+static int repack_without_refs(struct string_list *refnames, struct strbuf *err)
{
struct ref_dir *packed;
struct string_list_item *refname;
return 0;
}
-int delete_ref(const char *refname, const unsigned char *sha1, unsigned int flags)
+int delete_ref(const char *refname, const unsigned char *old_sha1,
+ unsigned int flags)
{
struct ref_transaction *transaction;
struct strbuf err = STRBUF_INIT;
transaction = ref_transaction_begin(&err);
if (!transaction ||
- ref_transaction_delete(transaction, refname,
- (sha1 && !is_null_sha1(sha1)) ? sha1 : NULL,
+ ref_transaction_delete(transaction, refname, old_sha1,
flags, NULL, &err) ||
ref_transaction_commit(transaction, &err)) {
error("%s", err.buf);
return 0;
}
+int delete_refs(struct string_list *refnames)
+{
+ struct strbuf err = STRBUF_INIT;
+ int i, result = 0;
+
+ if (!refnames->nr)
+ return 0;
+
+ result = repack_without_refs(refnames, &err);
+ if (result) {
+ /*
+ * If we failed to rewrite the packed-refs file, then
+ * it is unsafe to try to remove loose refs, because
+ * doing so might expose an obsolete packed value for
+ * a reference that might even point at an object that
+ * has been garbage collected.
+ */
+ if (refnames->nr == 1)
+ error(_("could not delete reference %s: %s"),
+ refnames->items[0].string, err.buf);
+ else
+ error(_("could not delete references: %s"), err.buf);
+
+ goto out;
+ }
+
+ for (i = 0; i < refnames->nr; i++) {
+ const char *refname = refnames->items[i].string;
+
+ if (delete_ref(refname, NULL, 0))
+ result |= error(_("could not remove reference %s"), refname);
+ }
+
+out:
+ strbuf_release(&err);
+ return result;
+}
+
/*
* People using contrib's git-new-workdir have .git/logs/refs ->
* /some/other/path/.git/logs/refs, and that may live on another device.
strbuf_release(&err);
goto rollback;
}
- hashcpy(lock->old_sha1, orig_sha1);
+ hashcpy(lock->old_oid.hash, orig_sha1);
if (write_ref_to_lockfile(lock, orig_sha1) ||
commit_ref_update(lock, orig_sha1, logmsg)) {
const unsigned char *sha1, const char *logmsg)
{
clear_loose_ref_cache(&ref_cache);
- if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
+ if (log_ref_write(lock->ref_name, lock->old_oid.hash, sha1, logmsg) < 0 ||
(strcmp(lock->ref_name, lock->orig_ref_name) &&
- log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
+ log_ref_write(lock->orig_ref_name, lock->old_oid.hash, sha1, logmsg) < 0)) {
unlock_ref(lock);
return -1;
}
head_sha1, &head_flag);
if (head_ref && (head_flag & REF_ISSYMREF) &&
!strcmp(head_ref, lock->ref_name))
- log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
+ log_ref_write("HEAD", lock->old_oid.hash, sha1, logmsg);
}
if (commit_ref(lock)) {
error("Couldn't set %s", lock->ref_name);
hashcpy(cb->sha1, nsha1);
if (hashcmp(cb->osha1, nsha1))
warning("Log for ref %s has gap after %s.",
- cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822));
+ cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
}
else if (cb->date == cb->at_time)
hashcpy(cb->sha1, nsha1);
else if (hashcmp(nsha1, cb->sha1))
warning("Log for ref %s unexpectedly ended on %s.",
cb->refname, show_date(cb->date, cb->tz,
- DATE_RFC2822));
+ DATE_MODE(RFC2822)));
hashcpy(cb->osha1, osha1);
hashcpy(cb->nsha1, nsha1);
cb->found_it = 1;
strbuf_addch(name, '/');
retval = do_for_each_reflog(name, fn, cb_data);
} else {
- unsigned char sha1[20];
- if (read_ref_full(name->buf, 0, sha1, NULL))
+ struct object_id oid;
+
+ if (read_ref_full(name->buf, 0, oid.hash, NULL))
retval = error("bad ref for %s", name->buf);
else
- retval = fn(name->buf, sha1, 0, cb_data);
+ retval = fn(name->buf, &oid, 0, cb_data);
}
if (retval)
break;
? TRANSACTION_NAME_CONFLICT
: TRANSACTION_GENERIC_ERROR;
reason = strbuf_detach(err, NULL);
- strbuf_addf(err, "Cannot lock ref '%s': %s",
+ strbuf_addf(err, "cannot lock ref '%s': %s",
update->refname, reason);
free(reason);
goto cleanup;
(update->flags & REF_NODEREF));
if (!overwriting_symref &&
- !hashcmp(update->lock->old_sha1, update->new_sha1)) {
+ !hashcmp(update->lock->old_oid.hash, update->new_sha1)) {
/*
* The reference already has the desired
* value, so we don't need to write it.
* write_ref_to_lockfile():
*/
update->lock = NULL;
- strbuf_addf(err, "Cannot update the ref '%s'.",
+ strbuf_addf(err, "cannot update the ref '%s'.",
update->refname);
ret = TRANSACTION_GENERIC_ERROR;
goto cleanup;
return ret;
}
+static int ref_present(const char *refname,
+ const struct object_id *oid, int flags, void *cb_data)
+{
+ struct string_list *affected_refnames = cb_data;
+
+ return string_list_has_string(affected_refnames, refname);
+}
+
+int initial_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ struct ref_dir *loose_refs = get_loose_refs(&ref_cache);
+ struct ref_dir *packed_refs = get_packed_refs(&ref_cache);
+ int ret = 0, i;
+ int n = transaction->nr;
+ struct ref_update **updates = transaction->updates;
+ struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
+
+ assert(err);
+
+ if (transaction->state != REF_TRANSACTION_OPEN)
+ die("BUG: commit called for transaction that is not open");
+
+ /* Fail if a refname appears more than once in the transaction: */
+ for (i = 0; i < n; i++)
+ string_list_append(&affected_refnames, updates[i]->refname);
+ string_list_sort(&affected_refnames);
+ if (ref_update_reject_duplicates(&affected_refnames, err)) {
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+
+ /*
+ * It's really undefined to call this function in an active
+ * repository or when there are existing references: we are
+ * only locking and changing packed-refs, so (1) any
+ * simultaneous processes might try to change a reference at
+ * the same time we do, and (2) any existing loose versions of
+ * the references that we are setting would have precedence
+ * over our values. But some remote helpers create the remote
+ * "HEAD" and "master" branches before calling this function,
+ * so here we really only check that none of the references
+ * that we are creating already exists.
+ */
+ if (for_each_rawref(ref_present, &affected_refnames))
+ die("BUG: initial ref transaction called with existing refs");
+
+ for (i = 0; i < n; i++) {
+ struct ref_update *update = updates[i];
+
+ if ((update->flags & REF_HAVE_OLD) &&
+ !is_null_sha1(update->old_sha1))
+ die("BUG: initial ref transaction with old_sha1 set");
+ if (verify_refname_available(update->refname,
+ &affected_refnames, NULL,
+ loose_refs, err) ||
+ verify_refname_available(update->refname,
+ &affected_refnames, NULL,
+ packed_refs, err)) {
+ ret = TRANSACTION_NAME_CONFLICT;
+ goto cleanup;
+ }
+ }
+
+ if (lock_packed_refs(0)) {
+ strbuf_addf(err, "unable to lock packed-refs file: %s",
+ strerror(errno));
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+
+ for (i = 0; i < n; i++) {
+ struct ref_update *update = updates[i];
+
+ if ((update->flags & REF_HAVE_NEW) &&
+ !is_null_sha1(update->new_sha1))
+ add_packed_ref(update->refname, update->new_sha1);
+ }
+
+ if (commit_packed_refs()) {
+ strbuf_addf(err, "unable to commit packed-refs file: %s",
+ strerror(errno));
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+
+cleanup:
+ transaction->state = REF_TRANSACTION_CLOSED;
+ string_list_clear(&affected_refnames, 0);
+ return ret;
+}
+
char *shorten_unambiguous_ref(const char *refname, int strict)
{
int i;