}
}
+/*
+ * Unconditional writing of a plain regular file is what
+ * "git difftool --dir-diff" wants to do for symlinks. We are preparing two
+ * temporary directories to be fed to a Git-unaware tool that knows how to
+ * show a diff of two directories (e.g. "diff -r A B").
+ *
+ * Because the tool is Git-unaware, if a symbolic link appears in either of
+ * these temporary directories, it will try to dereference and show the
+ * difference of the target of the symbolic link, which is not what we want,
+ * as the goal of the dir-diff mode is to produce an output that is logically
+ * equivalent to what "git diff" produces.
+ *
+ * Most importantly, we want to get textual comparison of the result of the
+ * readlink(2). get_symlink() provides that---it returns the contents of
+ * the symlink that gets written to a regular file to force the external tool
+ * to compare the readlink(2) result as text, even on a filesystem that is
+ * capable of doing a symbolic link.
+ */
+static char *get_symlink(const struct object_id *oid, const char *path)
+{
+ char *data;
+ if (is_null_oid(oid)) {
+ /* The symlink is unknown to Git so read from the filesystem */
+ struct strbuf link = STRBUF_INIT;
+ if (has_symlinks) {
+ if (strbuf_readlink(&link, path, strlen(path)))
+ die(_("could not read symlink %s"), path);
+ } else if (strbuf_read_file(&link, path, 128))
+ die(_("could not read symlink file %s"), path);
+
+ data = strbuf_detach(&link, NULL);
+ } else {
+ enum object_type type;
+ unsigned long size;
+ data = read_sha1_file(oid->hash, &type, &size);
+ if (!data)
+ die(_("could not read object %s for symlink %s"),
+ oid_to_hex(oid), path);
+ }
+
+ return data;
+}
+
static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
int argc, const char **argv)
{
struct hashmap working_tree_dups, submodules, symlinks2;
struct hashmap_iter iter;
struct pair_entry *entry;
- enum object_type type;
- unsigned long size;
struct index_state wtindex;
struct checkout lstate, rstate;
int rc, flags = RUN_GIT_CMD, err = 0;
}
if (S_ISLNK(lmode)) {
- char *content = read_sha1_file(loid.hash, &type, &size);
+ char *content = get_symlink(&loid, src_path);
add_left_or_right(&symlinks2, src_path, content, 0);
free(content);
}
if (S_ISLNK(rmode)) {
- char *content = read_sha1_file(roid.hash, &type, &size);
+ char *content = get_symlink(&roid, dst_path);
add_left_or_right(&symlinks2, dst_path, content, 1);
free(content);
}
return error("could not write '%s'", src_path);
}
- if (rmode) {
+ if (rmode && !S_ISLNK(rmode)) {
struct working_tree_entry *entry;
/* Avoid duplicate working_tree entries */
git difftool --dir-diff $symlinks --extcmd ls branch >output &&
# "sub" must only exist in "right"
# "file" and "file2" must be listed in both "left" and "right"
- grep sub output > sub-output &&
+ grep sub output >sub-output &&
test_line_count = 1 sub-output &&
grep file"$" output >file-output &&
test_line_count = 2 file-output &&
'
test_expect_success 'difftool properly honors gitlink and core.worktree' '
+ test_when_finished rm -rf submod/ule &&
git submodule add ./. submod/ule &&
test_config -C submod/ule diff.tool checktrees &&
test_config -C submod/ule difftool.checktrees.cmd '\''
cd submod/ule &&
echo good >expect &&
git difftool --tool=checktrees --dir-diff HEAD~ >actual &&
- test_cmp expect actual
+ test_cmp expect actual &&
+ rm -f expect actual
)
'
test_expect_success SYMLINKS 'difftool --dir-diff symlinked directories' '
+ test_when_finished git reset --hard &&
git init dirlinks &&
(
cd dirlinks &&
)
'
+test_expect_success SYMLINKS 'difftool --dir-diff handles modified symlinks' '
+ test_when_finished git reset --hard &&
+ touch b &&
+ ln -s b c &&
+ git add b c &&
+ test_tick &&
+ git commit -m initial &&
+ touch d &&
+ rm c &&
+ ln -s d c &&
+ cat >expect <<-EOF &&
+ b
+ c
+
+ c
+ EOF
+ git difftool --symlinks --dir-diff --extcmd ls >output &&
+ grep -v ^/ output >actual &&
+ test_cmp expect actual &&
+
+ git difftool --no-symlinks --dir-diff --extcmd ls >output &&
+ grep -v ^/ output >actual &&
+ test_cmp expect actual &&
+
+ # The left side contains symlink "c" that points to "b"
+ test_config difftool.cat.cmd "cat \$LOCAL/c" &&
+ printf "%s\n" b >expect &&
+
+ git difftool --symlinks --dir-diff --tool cat >actual &&
+ test_cmp expect actual &&
+
+ git difftool --symlinks --no-symlinks --dir-diff --tool cat >actual &&
+ test_cmp expect actual &&
+
+ # The right side contains symlink "c" that points to "d"
+ test_config difftool.cat.cmd "cat \$REMOTE/c" &&
+ printf "%s\n" d >expect &&
+
+ git difftool --symlinks --dir-diff --tool cat >actual &&
+ test_cmp expect actual &&
+
+ git difftool --no-symlinks --dir-diff --tool cat >actual &&
+ test_cmp expect actual &&
+
+ # Deleted symlinks
+ rm -f c &&
+ cat >expect <<-EOF &&
+ b
+ c
+
+ EOF
+ git difftool --symlinks --dir-diff --extcmd ls >output &&
+ grep -v ^/ output >actual &&
+ test_cmp expect actual &&
+
+ git difftool --no-symlinks --dir-diff --extcmd ls >output &&
+ grep -v ^/ output >actual &&
+ test_cmp expect actual
+'
+
test_done