mergetool: fix running in subdir when rerere enabled

"git mergetool" (without any pathspec on the command line) that is
not run from the top-level of the working tree no longer works in
Git v2.11, failing to get the list of unmerged paths from the output
of "git rerere remaining".  This regression was introduced by
57937f70a0 ("mergetool: honor diff.orderFile", 2016-10-07).

This is because the pathnames output by the 'git rerere remaining'
command are relative to the top-level directory but the 'git diff
--name-only' command expects its pathname arguments to be relative
to the current working directory.  To make everything consistent,
cd_to_toplevel before running 'git diff --name-only' and adjust any
relative pathnames.

Signed-off-by: Richard Hansen <hansenr@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-mergetool.sh b/git-mergetool.sh
index b506896dc1fcd8b2037d3bb61525371a74d0ca03..c062e3de3a503bd01203f2a6aef63eea63cae5c5 100755 (executable)
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -454,6 +454,17 @@ main () {
        merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
        merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 
+       prefix=$(git rev-parse --show-prefix) || exit 1
+       cd_to_toplevel
+
+       if test -n "$orderfile"
+       then
+               orderfile=$(
+                       git rev-parse --prefix "$prefix" -- "$orderfile" |
+                       sed -e 1d
+               )
+       fi
+
        if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
        then
                set -- $(git rerere remaining)
@@ -461,14 +472,16 @@ main () {
                then
                        print_noop_and_exit
                fi
+       elif test $# -ge 0
+       then
+               # rev-parse provides the -- needed for 'set'
+               eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
        fi
 
        files=$(git -c core.quotePath=false \
                diff --name-only --diff-filter=U \
                ${orderfile:+"-O$orderfile"} -- "$@")
 
-       cd_to_toplevel
-
        if test -z "$files"
        then
                print_noop_and_exit

diff --git a/t/t7610-mergetool.sh b/t/t7610-mergetool.sh
index ab0b005b28e26869f89b831ec11b5c677ea17e5f..180dd7057a7ca1b8b43586d30187765449ac0596 100755 (executable)
--- a/t/t7610-mergetool.sh
+++ b/t/t7610-mergetool.sh
@@ -234,7 +234,7 @@ test_expect_success 'mergetool merges all from subdir (rerere disabled)' '
        )
 '
 
-test_expect_failure 'mergetool merges all from subdir (rerere enabled)' '
+test_expect_success 'mergetool merges all from subdir (rerere enabled)' '
        test_when_finished "git reset --hard" &&
        git checkout -b test$test_count branch1 &&
        test_config rerere.enabled true &&
@@ -678,6 +678,11 @@ test_expect_success 'diff.orderFile configuration is honored' '
                b
                a
        EOF
+
+       # make sure "order-file" that is ambiguous between
+       # rev and path is understood correctly.
+       git branch order-file HEAD &&
+
        git mergetool --no-prompt --tool myecho >output &&
        git grep --no-index -h -A2 Merging: output >actual &&
        test_cmp expect actual