clone: leave repo in place after checkout errors

If we manage to clone a remote repository but run into an
error in the checkout, it is probably sane to leave the repo
directory in place. That lets the user examine the situation
without spending time to re-clone from the remote (which may
be a lengthy process).

Rather than try to convert each die() from the checkout code
path into an error(), we simply set a flag that tells the
"remove_junk" atexit function to print a helpful message and
leave the repo in place.

Note that the test added in this patch actually passes
without the code change. The reason is that the cleanup code
is buggy; we chdir into the working tree for the checkout,
but still may use relative paths to remove the directories
(which means if you cloned into "foo", we would accidentally
remove "foo" from the working tree!).  There's no point in
fixing it now, since this patch means we will never try to
remove anything after the chdir, anyway.

[jc: replaced the message with a more succinct version from
Jonathan]

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/clone.c b/builtin/clone.c
index eceaa749223419a276d18fd1621a5e88ff5b4510..f9c380eb6c536b657ddc65b88f6839ec761f7f25 100644 (file)
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -377,10 +377,32 @@ static void clone_local(const char *src_repo, const char *dest_repo)
 static const char *junk_work_tree;
 static const char *junk_git_dir;
 static pid_t junk_pid;
+enum {
+       JUNK_LEAVE_NONE,
+       JUNK_LEAVE_REPO,
+       JUNK_LEAVE_ALL
+} junk_mode = JUNK_LEAVE_NONE;
+
+static const char junk_leave_repo_msg[] =
+N_("Clone succeeded, but checkout failed.\n"
+   "You can inspect what was checked out with 'git status'\n"
+   "and retry the checkout with 'git checkout -f HEAD'\n");
 
 static void remove_junk(void)
 {
        struct strbuf sb = STRBUF_INIT;
+
+       switch (junk_mode) {
+       case JUNK_LEAVE_REPO:
+               warning("%s", _(junk_leave_repo_msg));
+               /* fall-through */
+       case JUNK_LEAVE_ALL:
+               return;
+       default:
+               /* proceed to removal */
+               break;
+       }
+
        if (getpid() != junk_pid)
                return;
        if (junk_git_dir) {
@@ -925,12 +947,13 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
        transport_unlock_pack(transport);
        transport_disconnect(transport);
 
+       junk_mode = JUNK_LEAVE_REPO;
        err = checkout();
 
        strbuf_release(&reflog_msg);
        strbuf_release(&branch_top);
        strbuf_release(&key);
        strbuf_release(&value);
-       junk_pid = 0;
+       junk_mode = JUNK_LEAVE_ALL;
        return err;
 }

diff --git a/t/t1060-object-corruption.sh b/t/t1060-object-corruption.sh
index c65a57cd2297ba3150c83f0ee2bf5fa8d3199a6c..3f8705139d74e8e358ae60cabe5d1cd92d316489 100755 (executable)
--- a/t/t1060-object-corruption.sh
+++ b/t/t1060-object-corruption.sh
@@ -89,6 +89,10 @@ test_expect_success 'clone --local detects corruption' '
        test_must_fail git clone --local bit-error corrupt-checkout
 '
 
+test_expect_success 'error detected during checkout leaves repo intact' '
+       test_path_is_dir corrupt-checkout/.git
+'
+
 test_expect_success 'clone --local detects missing objects' '
        test_must_fail git clone --local missing missing-checkout
 '