checkout --track: make up a sensible branch name if '-b' was omitted

diff --git a/lockfile.c b/lockfile.c
index b0118d0592f691d6ae9f321c6303f93d43007f6f..4023797b00fe21ecbabe3407ef8a12fca0690607 100644 (file)
--- a/lockfile.c
+++ b/lockfile.c
@@ -135,6 +135,9 @@ static int lock_file(struct lock_file *lk, const char *path)
        if (0 <= lk->fd) {
                if (!lock_file_list) {
                        signal(SIGINT, remove_lock_file_on_signal);
+                       signal(SIGHUP, remove_lock_file_on_signal);
+                       signal(SIGTERM, remove_lock_file_on_signal);
+                       signal(SIGQUIT, remove_lock_file_on_signal);
                        atexit(remove_lock_file);
                }
                lk->owner = getpid();
@@ -160,6 +163,34 @@ int hold_lock_file_for_update(struct lock_file *lk, const char *path, int die_on
        return fd;
 }
 
+int hold_lock_file_for_append(struct lock_file *lk, const char *path, int die_on_error)
+{
+       int fd, orig_fd;
+
+       fd = lock_file(lk, path);
+       if (fd < 0) {
+               if (die_on_error)
+                       die("unable to create '%s.lock': %s", path, strerror(errno));
+               return fd;
+       }
+
+       orig_fd = open(path, O_RDONLY);
+       if (orig_fd < 0) {
+               if (errno != ENOENT) {
+                       if (die_on_error)
+                               die("cannot open '%s' for copying", path);
+                       close(fd);
+                       return error("cannot open '%s' for copying", path);
+               }
+       } else if (copy_fd(orig_fd, fd)) {
+               if (die_on_error)
+                       exit(128);
+               close(fd);
+               return -1;
+       }
+       return fd;
+}
+
 int close_lock_file(struct lock_file *lk)
 {
        int fd = lk->fd;