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git/t/t4048-diff-combined-binary.sh
Patrick Steinhardt 38678e5df5 userdiff: fix leaking memory for configured diff drivers
The userdiff structures may be initialized either statically on the
stack or dynamically via configuration keys. In the latter case we end
up leaking memory because we didn't have any infrastructure to discern
those strings which have been allocated statically and those which have
been allocated dynamically.

Refactor the code such that we have two pointers for each of these
strings: one that holds the value as accessed by other subsystems, and
one that points to the same string in case it has been allocated. Like
this, we can safely free the second pointer and thus plug those memory
leaks.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-08-14 10:08:01 -07:00

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#!/bin/sh
test_description='combined and merge diff handle binary files and textconv'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup binary merge conflict' '
echo oneQ1 | q_to_nul >binary &&
git add binary &&
git commit -m one &&
echo twoQ2 | q_to_nul >binary &&
git commit -a -m two &&
two=$(git rev-parse --short HEAD:binary) &&
git checkout -b branch-binary HEAD^ &&
echo threeQ3 | q_to_nul >binary &&
git commit -a -m three &&
three=$(git rev-parse --short HEAD:binary) &&
test_must_fail git merge main &&
echo resolvedQhooray | q_to_nul >binary &&
git commit -a -m resolved &&
res=$(git rev-parse --short HEAD:binary)
'
cat >expect <<EOF
resolved
diff --git a/binary b/binary
index $three..$res 100644
Binary files a/binary and b/binary differ
resolved
diff --git a/binary b/binary
index $two..$res 100644
Binary files a/binary and b/binary differ
EOF
test_expect_success 'diff -m indicates binary-ness' '
git show --format=%s -m >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --combined binary
index $three,$two..$res
Binary files differ
EOF
test_expect_success 'diff -c indicates binary-ness' '
git show --format=%s -c >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --cc binary
index $three,$two..$res
Binary files differ
EOF
test_expect_success 'diff --cc indicates binary-ness' '
git show --format=%s --cc >actual &&
test_cmp expect actual
'
test_expect_success 'setup non-binary with binary attribute' '
git checkout main &&
test_commit one text &&
test_commit two text &&
two=$(git rev-parse --short HEAD:text) &&
git checkout -b branch-text HEAD^ &&
test_commit three text &&
three=$(git rev-parse --short HEAD:text) &&
test_must_fail git merge main &&
test_commit resolved text &&
res=$(git rev-parse --short HEAD:text) &&
echo text -diff >.gitattributes
'
cat >expect <<EOF
resolved
diff --git a/text b/text
index $three..$res 100644
Binary files a/text and b/text differ
resolved
diff --git a/text b/text
index $two..$res 100644
Binary files a/text and b/text differ
EOF
test_expect_success 'diff -m respects binary attribute' '
git show --format=%s -m >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --combined text
index $three,$two..$res
Binary files differ
EOF
test_expect_success 'diff -c respects binary attribute' '
git show --format=%s -c >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --cc text
index $three,$two..$res
Binary files differ
EOF
test_expect_success 'diff --cc respects binary attribute' '
git show --format=%s --cc >actual &&
test_cmp expect actual
'
test_expect_success 'setup textconv attribute' '
echo "text diff=upcase" >.gitattributes &&
git config diff.upcase.textconv "tr a-z A-Z <"
'
cat >expect <<EOF
resolved
diff --git a/text b/text
index $three..$res 100644
--- a/text
+++ b/text
@@ -1 +1 @@
-THREE
+RESOLVED
resolved
diff --git a/text b/text
index $two..$res 100644
--- a/text
+++ b/text
@@ -1 +1 @@
-TWO
+RESOLVED
EOF
test_expect_success 'diff -m respects textconv attribute' '
git show --format=%s -m >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --combined text
index $three,$two..$res
--- a/text
+++ b/text
@@@ -1,1 -1,1 +1,1 @@@
- THREE
-TWO
++RESOLVED
EOF
test_expect_success 'diff -c respects textconv attribute' '
git show --format=%s -c >actual &&
test_cmp expect actual
'
cat >expect <<EOF
resolved
diff --cc text
index $three,$two..$res
--- a/text
+++ b/text
@@@ -1,1 -1,1 +1,1 @@@
- THREE
-TWO
++RESOLVED
EOF
test_expect_success 'diff --cc respects textconv attribute' '
git show --format=%s --cc >actual &&
test_cmp expect actual
'
cat >expect <<EOF
diff --combined text
index $three,$two..$res
--- a/text
+++ b/text
@@@ -1,1 -1,1 +1,1 @@@
- three
-two
++resolved
EOF
test_expect_success 'diff-tree plumbing does not respect textconv' '
git diff-tree HEAD -c -p >full &&
tail -n +2 full >actual &&
test_cmp expect actual
'
cat >expect <<EOF
diff --cc text
index $three,$two..0000000
--- a/text
+++ b/text
@@@ -1,1 -1,1 +1,5 @@@
++<<<<<<< HEAD
+THREE
++=======
+ TWO
++>>>>>>> MAIN
EOF
test_expect_success 'diff --cc respects textconv on worktree file' '
git reset --hard HEAD^ &&
test_must_fail git merge main &&
git diff >actual &&
test_cmp expect actual
'
test_done