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

diff --git a/lockfile.c b/lockfile.c
index 9a1f64d8d71d13ee6be48c539d79764066288f07..4023797b00fe21ecbabe3407ef8a12fca0690607 100644 (file)
--- a/lockfile.c
+++ b/lockfile.c
@@ -12,8 +12,11 @@ static void remove_lock_file(void)
 
        while (lock_file_list) {
                if (lock_file_list->owner == me &&
-                   lock_file_list->filename[0])
+                   lock_file_list->filename[0]) {
+                       if (lock_file_list->fd >= 0)
+                               close(lock_file_list->fd);
                        unlink(lock_file_list->filename);
+               }
                lock_file_list = lock_file_list->next;
        }
 }
@@ -21,7 +24,7 @@ static void remove_lock_file(void)
 static void remove_lock_file_on_signal(int signo)
 {
        remove_lock_file();
-       signal(SIGINT, SIG_DFL);
+       signal(signo, SIG_DFL);
        raise(signo);
 }
 
@@ -92,7 +95,7 @@ static char *resolve_symlink(char *p, size_t s)
                        return p;
                }
 
-               if (link[0] == '/') {
+               if (is_absolute_path(link)) {
                        /* absolute path simply replaces p */
                        if (link_len < s)
                                strcpy(p, link);
@@ -120,8 +123,6 @@ static char *resolve_symlink(char *p, size_t s)
 
 static int lock_file(struct lock_file *lk, const char *path)
 {
-       int fd;
-
        if (strlen(path) >= sizeof(lk->filename)) return -1;
        strcpy(lk->filename, path);
        /*
@@ -130,10 +131,13 @@ static int lock_file(struct lock_file *lk, const char *path)
         */
        resolve_symlink(lk->filename, sizeof(lk->filename)-5);
        strcat(lk->filename, ".lock");
-       fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
-       if (0 <= fd) {
+       lk->fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
+       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();
@@ -148,7 +152,7 @@ static int lock_file(struct lock_file *lk, const char *path)
        }
        else
                lk->filename[0] = 0;
-       return fd;
+       return lk->fd;
 }
 
 int hold_lock_file_for_update(struct lock_file *lk, const char *path, int die_on_error)
@@ -159,16 +163,54 @@ 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;
+       lk->fd = -1;
+       return close(fd);
+}
+
 int commit_lock_file(struct lock_file *lk)
 {
        char result_file[PATH_MAX];
-       int i;
+       size_t i;
+       if (lk->fd >= 0 && close_lock_file(lk))
+               return -1;
        strcpy(result_file, lk->filename);
        i = strlen(result_file) - 5; /* .lock */
        result_file[i] = 0;
-       i = rename(lk->filename, result_file);
+       if (rename(lk->filename, result_file))
+               return -1;
        lk->filename[0] = 0;
-       return i;
+       return 0;
 }
 
 int hold_locked_index(struct lock_file *lk, int die_on_error)
@@ -184,9 +226,12 @@ void set_alternate_index_output(const char *name)
 int commit_locked_index(struct lock_file *lk)
 {
        if (alternate_index_output) {
-               int result = rename(lk->filename, alternate_index_output);
+               if (lk->fd >= 0 && close_lock_file(lk))
+                       return -1;
+               if (rename(lk->filename, alternate_index_output))
+                       return -1;
                lk->filename[0] = 0;
-               return result;
+               return 0;
        }
        else
                return commit_lock_file(lk);
@@ -194,7 +239,10 @@ int commit_locked_index(struct lock_file *lk)
 
 void rollback_lock_file(struct lock_file *lk)
 {
-       if (lk->filename[0])
+       if (lk->filename[0]) {
+               if (lk->fd >= 0)
+                       close(lk->fd);
                unlink(lk->filename);
+       }
        lk->filename[0] = 0;
 }