builtin-am: handle stray state directory

Should git-am terminate unexpectedly between the point where the state
directory is created, but the "next" and "last" files are not written
yet, a stray state directory will be left behind.

As such, since b141f3c (am: handle stray $dotest directory, 2013-06-15),
git-am.sh explicitly recognizes such a stray directory, and allows the
user to remove it with am --abort.

Re-implement this feature in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/am.c b/builtin/am.c
index a02c84ea8f9d411a8166ef10f60e1aef0735368e..47dd4c7ddfac5e3ac5a0e3f671bb4c59c6be9c3f 100644 (file)
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1530,6 +1530,23 @@ int cmd_am(int argc, const char **argv, const char *prefix)
                struct argv_array paths = ARGV_ARRAY_INIT;
                int i;
 
+               /*
+                * Handle stray state directory in the independent-run case. In
+                * the --rebasing case, it is up to the caller to take care of
+                * stray directories.
+                */
+               if (file_exists(state.dir) && !state.rebasing) {
+                       if (resume == RESUME_ABORT) {
+                               am_destroy(&state);
+                               am_state_release(&state);
+                               return 0;
+                       }
+
+                       die(_("Stray %s directory found.\n"
+                               "Use \"git am --abort\" to remove it."),
+                               state.dir);
+               }
+
                if (resume)
                        die(_("Resolve operation not in progress, we are not resuming."));