@@ -562,11 +562,13 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
if (*entry->left) {
add_path(&ldir, ldir_len, entry->path);
ensure_leading_directories(ldir.buf);
+ unlink(ldir.buf);
write_file(ldir.buf, "%s", entry->left);
}
if (*entry->right) {
add_path(&rdir, rdir_len, entry->path);
ensure_leading_directories(rdir.buf);
+ unlink(rdir.buf);
write_file(rdir.buf, "%s", entry->right);
}
}
@@ -683,7 +683,6 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
rm c &&
ln -s d c &&
cat >expect <<-EOF &&
- b
c
c
@@ -719,7 +718,6 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
# Deleted symlinks
rm -f c &&
cat >expect <<-EOF &&
- b
c
EOF
@@ -732,6 +730,73 @@ test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
test_cmp expect actual
'
+test_expect_success SYMLINKS 'difftool --dir-diff writes symlinks as raw text' '
+ # Start out on a branch called "branch-init".
+ git init -b branch-init symlink-files &&
+ test_when_finished rm -rf symlink-files &&
+ (
+ cd ./symlink-files &&
+
+ # This test ensures that symlinks are written as raw text.
+ # The "cat" tools output link and file contents.
+ git config difftool.cat-left-link.cmd "cat \"\$LOCAL/link\"" &&
+ git config difftool.cat-left-a.cmd "cat \"\$LOCAL/file-a\"" &&
+ git config difftool.cat-right-link.cmd "cat \"\$REMOTE/link\"" &&
+ git config difftool.cat-right-b.cmd "cat \"\$REMOTE/file-b\"" &&
+
+ # Record the empty initial state so that we can come back here
+ # later and not have to consider the any cases where difftool
+ # will create symlinks back into the worktree.
+ test_tick &&
+ git commit --allow-empty -m init &&
+
+ # Create a file called "file-a" with a symlink pointing to it.
+ git switch -c branch-a &&
+ echo a >file-a &&
+ ln -s file-a link &&
+ git add file-a link &&
+ test_tick &&
+ git commit -m link-to-file-a &&
+
+ # Create a file called "file-b" and point the symlink to it.
+ git switch -c branch-b &&
+ echo b >file-b &&
+ rm link &&
+ ln -s file-b link &&
+ git add file-b link &&
+ git rm file-a &&
+ test_tick &&
+ git commit -m link-to-file-b &&
+
+ # Checkout the initial branch so that the --symlinks behavior is
+ # not activated. The two directories should be completely
+ # independent with no syminks pointing back here.
+ git switch branch-init &&
+
+ # The left link must be "file-a" and "file-a" must contain "a".
+ printf "%s\n" file-a >expect &&
+ git difftool --symlinks --dir-diff --tool cat-left-link \
+ branch-a branch-b >actual &&
+ test_cmp expect actual &&
+
+ echo a >expect &&
+ git difftool --symlinks --dir-diff --tool cat-left-a \
+ branch-a branch-b >actual &&
+ test_cmp expect actual &&
+
+ # The right link must be "file-b" and "file-b" must contain "b".
+ printf "%s\n" file-b >expect &&
+ git difftool --symlinks --dir-diff --tool cat-right-link \
+ branch-a branch-b >actual &&
+ test_cmp expect actual &&
+
+ echo b >expect &&
+ git difftool --symlinks --dir-diff --tool cat-right-b \
+ branch-a branch-b >actual &&
+ test_cmp expect actual
+ )
+'
+
test_expect_success 'add -N and difftool -d' '
test_when_finished git reset --hard &&
The difftool dir-diff mode handles symlinks by replacing them with their readlink(2) values. This allows diff tools to see changes to symlinks as if they were regular text diffs with the old and new path values. This is analogous to what "git diff" displays when symlinks change. The temporary diff directories that are created initially contain symlinks because they get checked-out using a temporary index that retains the original symlinks as checked-in to the repository. A bug was introduced when difftool was rewritten in C that made difftool write the readlink(2) contents into the pointed-to file rather than the symlink itself. The write was going through the symlink and writing to its target rather than writing to the symlink path itself. Replace symlinks with raw text files by unlinking the symlink path before writing the readlink(2) content into them. When 18ec800512eb0634a0bf5e86b36ed156fbee73f3 added handling for modified symlinks this bug got recorded in the test suite. The tests included the pointed-to symlink target paths. These paths were being reported because difftool was erroneously writing to them, but they should have never been reported nor written. Correct the modified-symlinks test cases by removing the target files from the expected output. Add a test to ensure that symlinks are written with the readlink(2) values and that the target files contain their original content. Reported-by: Alan Blotz <work@blotz.org> Helped-by: Đoàn Trần Công Danh <congdanhqx@gmail.com> Signed-off-by: David Aguilar <davvid@gmail.com> --- Sorry for the patch noise. This supersedes v2 as well. Changes since v1: - Removed a spurious newline after the new test. - Updated test comments to fix a "branch-init" typo. - Updated test comments to clarify the purpose of the "cat" tools. - No functional changes. builtin/difftool.c | 2 ++ t/t7800-difftool.sh | 69 +++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 69 insertions(+), 2 deletions(-)