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reftable/stack: fix stale lock when dying
When starting a transaction via `reftable_stack_init_addition()`, we create a lockfile for the reftable stack itself which we'll write the new list of tables to. But if we terminate abnormally e.g. via a call to `die()`, then we do not remove the lockfile. Subsequent executions of Git which try to modify references will thus fail with an out-of-date error. Fix this bug by registering the lock as a `struct tempfile`, which ensures automatic cleanup for us. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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parent
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@ -17,6 +17,8 @@ license that can be found in the LICENSE file or at
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#include "reftable-merged.h"
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#include "writer.h"
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#include "tempfile.h"
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static int stack_try_add(struct reftable_stack *st,
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int (*write_table)(struct reftable_writer *wr,
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void *arg),
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@ -440,8 +442,7 @@ static void format_name(struct strbuf *dest, uint64_t min, uint64_t max)
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}
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struct reftable_addition {
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int lock_file_fd;
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struct strbuf lock_file_name;
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struct tempfile *lock_file;
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struct reftable_stack *stack;
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char **new_tables;
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@ -449,24 +450,19 @@ struct reftable_addition {
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uint64_t next_update_index;
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};
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#define REFTABLE_ADDITION_INIT \
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{ \
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.lock_file_name = STRBUF_INIT \
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}
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#define REFTABLE_ADDITION_INIT {0}
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static int reftable_stack_init_addition(struct reftable_addition *add,
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struct reftable_stack *st)
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{
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struct strbuf lock_file_name = STRBUF_INIT;
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int err = 0;
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add->stack = st;
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strbuf_reset(&add->lock_file_name);
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strbuf_addstr(&add->lock_file_name, st->list_file);
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strbuf_addstr(&add->lock_file_name, ".lock");
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strbuf_addf(&lock_file_name, "%s.lock", st->list_file);
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add->lock_file_fd = open(add->lock_file_name.buf,
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O_EXCL | O_CREAT | O_WRONLY, 0666);
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if (add->lock_file_fd < 0) {
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add->lock_file = create_tempfile(lock_file_name.buf);
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if (!add->lock_file) {
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if (errno == EEXIST) {
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err = REFTABLE_LOCK_ERROR;
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} else {
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@ -475,7 +471,7 @@ static int reftable_stack_init_addition(struct reftable_addition *add,
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goto done;
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}
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if (st->config.default_permissions) {
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if (chmod(add->lock_file_name.buf, st->config.default_permissions) < 0) {
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if (chmod(add->lock_file->filename.buf, st->config.default_permissions) < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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@ -495,6 +491,7 @@ static int reftable_stack_init_addition(struct reftable_addition *add,
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if (err) {
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reftable_addition_close(add);
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}
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strbuf_release(&lock_file_name);
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return err;
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}
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@ -512,15 +509,7 @@ static void reftable_addition_close(struct reftable_addition *add)
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add->new_tables = NULL;
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add->new_tables_len = 0;
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if (add->lock_file_fd > 0) {
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close(add->lock_file_fd);
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add->lock_file_fd = 0;
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}
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if (add->lock_file_name.len > 0) {
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unlink(add->lock_file_name.buf);
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strbuf_release(&add->lock_file_name);
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}
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delete_tempfile(&add->lock_file);
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strbuf_release(&nm);
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}
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@ -536,8 +525,10 @@ void reftable_addition_destroy(struct reftable_addition *add)
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int reftable_addition_commit(struct reftable_addition *add)
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{
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struct strbuf table_list = STRBUF_INIT;
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int lock_file_fd = get_tempfile_fd(add->lock_file);
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int i = 0;
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int err = 0;
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if (add->new_tables_len == 0)
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goto done;
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@ -550,28 +541,20 @@ int reftable_addition_commit(struct reftable_addition *add)
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strbuf_addstr(&table_list, "\n");
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}
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err = write_in_full(add->lock_file_fd, table_list.buf, table_list.len);
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err = write_in_full(lock_file_fd, table_list.buf, table_list.len);
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strbuf_release(&table_list);
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if (err < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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err = close(add->lock_file_fd);
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add->lock_file_fd = 0;
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if (err < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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err = rename(add->lock_file_name.buf, add->stack->list_file);
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err = rename_tempfile(&add->lock_file, add->stack->list_file);
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if (err < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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/* success, no more state to clean up. */
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strbuf_release(&add->lock_file_name);
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for (i = 0; i < add->new_tables_len; i++) {
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reftable_free(add->new_tables[i]);
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}
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