revert: actually check for a dirty index

The previous code mistakenly used wt_status_prepare to check whether the
index had anything commitable in it; however, that function is just an
init function, and will never report a dirty index.

The correct way with wt_status_* would be to call wt_status_print with the
output pointing to /dev/null or similar. However, that does extra work by
both examining the working tree and spewing status information to nowhere.

Instead, let's just implement the useful subset of wt_status_print as an
"is_index_dirty" function.

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

diff --git a/builtin-revert.c b/builtin-revert.c
index 358af537476b0b558989f27fe60627af6977635b..64f0d0ee028fd143ea065cad93ce7be03d94839d 100644 (file)
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -8,6 +8,8 @@
 #include "exec_cmd.h"
 #include "utf8.h"
 #include "parse-options.h"
+#include "diff.h"
+#include "revision.h"
 
 /*
  * This implements the builtins revert and cherry-pick.
@@ -245,6 +247,17 @@ static char *help_msg(const unsigned char *sha1)
        return helpbuf;
 }
 
+static int index_is_dirty(void)
+{
+       struct rev_info rev;
+       init_revisions(&rev, NULL);
+       setup_revisions(0, NULL, &rev, "HEAD");
+       DIFF_OPT_SET(&rev.diffopt, QUIET);
+       DIFF_OPT_SET(&rev.diffopt, EXIT_WITH_STATUS);
+       run_diff_index(&rev, 1);
+       return !!DIFF_OPT_TST(&rev.diffopt, HAS_CHANGES);
+}
+
 static int revert_or_cherry_pick(int argc, const char **argv)
 {
        unsigned char head[20];
@@ -273,12 +286,11 @@ static int revert_or_cherry_pick(int argc, const char **argv)
                if (write_tree(head, 0, NULL))
                        die ("Your index file is unmerged.");
        } else {
-               struct wt_status s;
-
                if (get_sha1("HEAD", head))
                        die ("You do not have a valid HEAD");
-               wt_status_prepare(&s);
-               if (s.commitable)
+               if (read_cache() < 0)
+                       die("could not read the index");
+               if (index_is_dirty())
                        die ("Dirty index: cannot %s", me);
                discard_cache();
        }

diff --git a/t/t3501-revert-cherry-pick.sh b/t/t3501-revert-cherry-pick.sh
index 2dbe04fb20aea9a18e6fe751539bcb48e5e7b4d3..6da212825a447866364979c2fb10778b6bbc02d5 100755 (executable)
--- a/t/t3501-revert-cherry-pick.sh
+++ b/t/t3501-revert-cherry-pick.sh
@@ -59,4 +59,13 @@ test_expect_success 'revert after renaming branch' '
 
 '
 
+test_expect_success 'revert forbidden on dirty working tree' '
+
+       echo content >extra_file &&
+       git add extra_file &&
+       test_must_fail git revert HEAD 2>errors &&
+       grep "Dirty index" errors
+
+'
+
 test_done