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mergetool: Provide an empty file when needed
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Some merge tools cannot cope when $LOCAL, $BASE, or $REMOTE are missing.
$BASE can be missing when two branches independently add the same
filename.

Provide an empty file to make these tools happy.

When a delete/modify conflict occurs, $LOCAL and $REMOTE can also be
missing. We have special case code to handle such case so this change
may not affect that codepath, but try to be consistent and create an
empty file for them anyway.

Reported-by: Jason Wenger <jcwenger@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@davvid @gitster
davvid authored and gitster committed Jan 23, 2012
1 parent 5fbdb9c commit ec245ba
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Showing 2 changed files with 35 additions and 5 deletions.
12 changes: 8 additions & 4 deletions git-mergetool.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -181,10 +181,14 @@ stage_submodule () {
}

checkout_staged_file () {
tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^ ]*\) ')
tmpfile=$(expr \
"$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
: '\([^ ]*\) ')

if test $? -eq 0 -a -n "$tmpfile" ; then
mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
else
>"$3"
fi
}

Expand Down Expand Up @@ -224,9 +228,9 @@ merge_file () {
mv -- "$MERGED" "$BACKUP"
cp -- "$BACKUP" "$MERGED"

base_present && checkout_staged_file 1 "$MERGED" "$BASE"
local_present && checkout_staged_file 2 "$MERGED" "$LOCAL"
remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"
checkout_staged_file 1 "$MERGED" "$BASE"
checkout_staged_file 2 "$MERGED" "$LOCAL"
checkout_staged_file 3 "$MERGED" "$REMOTE"

if test -z "$local_mode" -o -z "$remote_mode"; then
echo "Deleted merge conflict for '$MERGED':"
Expand Down
28 changes: 27 additions & 1 deletion t/t7610-mergetool.sh
View file
Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ test_expect_success 'setup' '
echo branch1 change >file1 &&
echo branch1 newfile >file2 &&
echo branch1 spaced >"spaced name" &&
echo branch1 both added >both &&
echo branch1 change file11 >file11 &&
echo branch1 change file13 >file13 &&
echo branch1 sub >subdir/file3 &&
Expand All @@ -50,6 +51,7 @@ test_expect_success 'setup' '
git checkout -b submod-branch1
) &&
git add file1 "spaced name" file11 file13 file2 subdir/file3 submod &&
git add both &&
git rm file12 &&
git commit -m "branch1 changes" &&
Expand All @@ -58,6 +60,7 @@ test_expect_success 'setup' '
echo master updated >file1 &&
echo master new >file2 &&
echo master updated spaced >"spaced name" &&
echo master both added >both &&
echo master updated file12 >file12 &&
echo master updated file14 >file14 &&
echo master new sub >subdir/file3 &&
Expand All @@ -69,18 +72,22 @@ test_expect_success 'setup' '
git checkout -b submod-master
) &&
git add file1 "spaced name" file12 file14 file2 subdir/file3 submod &&
git add both &&
git rm file11 &&
git commit -m "master updates" &&
git config merge.tool mytool &&
git config mergetool.mytool.cmd "cat \"\$REMOTE\" >\"\$MERGED\"" &&
git config mergetool.mytool.trustExitCode true
git config mergetool.mytool.trustExitCode true &&
git config mergetool.mybase.cmd "cat \"\$BASE\" >\"\$MERGED\"" &&
git config mergetool.mybase.trustExitCode true
'

test_expect_success 'custom mergetool' '
git checkout -b test1 branch1 &&
git submodule update -N &&
test_must_fail git merge master >/dev/null 2>&1 &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "" | git mergetool file1 file1 ) &&
( yes "" | git mergetool file2 "spaced name" >/dev/null 2>&1 ) &&
( yes "" | git mergetool subdir/file3 >/dev/null 2>&1 ) &&
Expand All @@ -101,6 +108,7 @@ test_expect_success 'mergetool crlf' '
( yes "" | git mergetool file1 >/dev/null 2>&1 ) &&
( yes "" | git mergetool file2 >/dev/null 2>&1 ) &&
( yes "" | git mergetool "spaced name" >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "" | git mergetool subdir/file3 >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file12 >/dev/null 2>&1 ) &&
Expand Down Expand Up @@ -131,6 +139,7 @@ test_expect_success 'mergetool on file in parent dir' '
cd subdir &&
( yes "" | git mergetool ../file1 >/dev/null 2>&1 ) &&
( yes "" | git mergetool ../file2 ../spaced\ name >/dev/null 2>&1 ) &&
( yes "" | git mergetool ../both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool ../file11 >/dev/null 2>&1 ) &&
( yes "d" | git mergetool ../file12 >/dev/null 2>&1 ) &&
( yes "l" | git mergetool ../submod >/dev/null 2>&1 ) &&
Expand Down Expand Up @@ -212,6 +221,7 @@ test_expect_success 'deleted vs modified submodule' '
test_must_fail git merge master &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "r" | git mergetool submod ) &&
rmdir submod && mv submod-movedaside submod &&
Expand All @@ -228,6 +238,7 @@ test_expect_success 'deleted vs modified submodule' '
test_must_fail git merge master &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "l" | git mergetool submod ) &&
test ! -e submod &&
Expand All @@ -241,6 +252,7 @@ test_expect_success 'deleted vs modified submodule' '
test_must_fail git merge test6 &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "r" | git mergetool submod ) &&
test ! -e submod &&
Expand All @@ -256,6 +268,7 @@ test_expect_success 'deleted vs modified submodule' '
test_must_fail git merge test6 &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "l" | git mergetool submod ) &&
test "$(cat submod/bar)" = "master submodule" &&
Expand All @@ -279,6 +292,7 @@ test_expect_success 'file vs modified submodule' '
test_must_fail git merge master &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "r" | git mergetool submod ) &&
rmdir submod && mv submod-movedaside submod &&
Expand All @@ -294,6 +308,7 @@ test_expect_success 'file vs modified submodule' '
test_must_fail git merge master &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "l" | git mergetool submod ) &&
git submodule update -N &&
Expand All @@ -309,6 +324,7 @@ test_expect_success 'file vs modified submodule' '
test_must_fail git merge test7 &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both >/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "r" | git mergetool submod ) &&
test -d submod.orig &&
Expand All @@ -324,6 +340,7 @@ test_expect_success 'file vs modified submodule' '
test_must_fail git merge test7 &&
test -n "$(git ls-files -u)" &&
( yes "" | git mergetool file1 file2 spaced\ name subdir/file3 >/dev/null 2>&1 ) &&
( yes "" | git mergetool both>/dev/null 2>&1 ) &&
( yes "d" | git mergetool file11 file12 >/dev/null 2>&1 ) &&
( yes "l" | git mergetool submod ) &&
test "$(cat submod/bar)" = "master submodule" &&
Expand Down Expand Up @@ -445,4 +462,13 @@ test_expect_success 'directory vs modified submodule' '
git submodule update -N
'

test_expect_success 'file with no base' '
git checkout -b test13 branch1 &&
test_must_fail git merge master &&
git mergetool --no-prompt --tool mybase -- both &&
>expected &&
test_cmp both expected &&
git reset --hard master >/dev/null 2>&1
'

test_done

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