[PATCH 25/34] checkout: clean up half-prepared directories in --to mode

[Nguyễn Thái Ngọc Duy]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/checkout.c     | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 t/t2025-checkout-to.sh |  6 ++++++
 2 files changed, 54 insertions(+)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 01a28b4..5dfdbda 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -20,6 +20,7 @@
 #include "resolve-undo.h"
 #include "submodule.h"
 #include "argv-array.h"
+#include "sigchain.h"
 
 static const char * const checkout_usage[] = {
        N_("git checkout [options] <branch>"),
@@ -823,6 +824,35 @@ static int switch_branches(const struct checkout_opts 
*opts,
        return ret || writeout_error;
 }
 
+static char *junk_work_tree;
+static char *junk_git_dir;
+static int is_junk;
+static pid_t junk_pid;
+
+static void remove_junk(void)
+{
+       struct strbuf sb = STRBUF_INIT;
+       if (!is_junk || getpid() != junk_pid)
+               return;
+       if (junk_git_dir) {
+               strbuf_addstr(&sb, junk_git_dir);
+               remove_dir_recursively(&sb, 0);
+               strbuf_reset(&sb);
+       }
+       if (junk_work_tree) {
+               strbuf_addstr(&sb, junk_work_tree);
+               remove_dir_recursively(&sb, 0);
+       }
+       strbuf_release(&sb);
+}
+
+static void remove_junk_on_signal(int signo)
+{
+       remove_junk();
+       sigchain_pop(signo);
+       raise(signo);
+}
+
 static int prepare_linked_checkout(const struct checkout_opts *opts,
                                   struct branch_info *new)
 {
@@ -859,8 +889,15 @@ static int prepare_linked_checkout(const struct 
checkout_opts *opts,
                strbuf_addf(&sb_repo, "%d", counter);
        }
        name = strrchr(sb_repo.buf, '/') + 1;
+
+       junk_pid = getpid();
+       atexit(remove_junk);
+       sigchain_push_common(remove_junk_on_signal);
+
        if (mkdir(sb_repo.buf, 0777))
                die_errno(_("could not create directory of '%s'"), sb_repo.buf);
+       junk_git_dir = xstrdup(sb_repo.buf);
+       is_junk = 1;
 
        /*
         * lock the incomplete repo so prune won't delete it, unlock
@@ -873,6 +910,7 @@ static int prepare_linked_checkout(const struct 
checkout_opts *opts,
        if (safe_create_leading_directories_const(sb_git.buf))
                die_errno(_("could not create leading directories of '%s'"),
                          sb_git.buf);
+       junk_work_tree = xstrdup(path);
 
        strbuf_reset(&sb);
        strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
@@ -902,9 +940,19 @@ static int prepare_linked_checkout(const struct 
checkout_opts *opts,
        cp.git_cmd = 1;
        cp.argv = opts->saved_argv;
        ret = run_command(&cp);
+       if (!ret) {
+               is_junk = 0;
+               free(junk_work_tree);
+               free(junk_git_dir);
+               junk_work_tree = NULL;
+               junk_git_dir = NULL;
+       }
        strbuf_reset(&sb);
        strbuf_addf(&sb, "%s/locked", sb_repo.buf);
        unlink_or_warn(sb.buf);
+       strbuf_release(&sb);
+       strbuf_release(&sb_repo);
+       strbuf_release(&sb_git);
        return ret;
 }
 
diff --git a/t/t2025-checkout-to.sh b/t/t2025-checkout-to.sh
index edd3404..e2db078 100755
--- a/t/t2025-checkout-to.sh
+++ b/t/t2025-checkout-to.sh
@@ -17,6 +17,12 @@ test_expect_success 'checkout --to an existing worktree' '
        test_must_fail git checkout --detach --to existing master
 '
 
+test_expect_success 'checkout --to refuses to checkout locked branch' '
+       test_must_fail git checkout --to zere master &&
+       ! test -d zere &&
+       ! test -d .git/worktrees/zere
+'
+
 test_expect_success 'checkout --to a new worktree' '
        git rev-parse HEAD >expect &&
        git checkout --detach --to here master &&
-- 
2.1.0.rc0.78.gc0d8480

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