[PATCH v5 5/5] setup: Don't dereference in-tree symlinks for absolute paths

[Martin Erik Werner <martinerikwerner@gmail.com>]

The 'prefix_path_gently' function currently applies real_path to
everything if given an absolute path, dereferencing symlinks both
outside and inside the work tree. In order to manipulate symlinks in the
work tree using absolute paths, symlinks should only be dereferenced
outside the work tree.

Modify the 'prefix_path_gently' to first normalize the path in order to
make sure path levels are separated by '/', then pass the result to
'abspath_part_inside_repo' to find the in-repo part (without dereferencing
any symlinks inside the work tree).

For absolute paths, 'prefix_path_gently' did not, nor does now do, any
actual prefixing, hence the result from 'abspath_part_in_repo' is
returned as-is.

Fixes t0060-82.

Signed-off-by: Martin Erik Werner <martinerikwerner@gmail.com>
---
 setup.c               | 36 ++++++++++++++++--------------------
 t/t0060-path-utils.sh |  2 +-
 2 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/setup.c b/setup.c
index a2e60ab..230505c 100644
--- a/setup.c
+++ b/setup.c
@@ -86,11 +86,23 @@ char *prefix_path_gently(const char *prefix, int len,
 	const char *orig = path;
 	char *sanitized;
 	if (is_absolute_path(orig)) {
-		const char *temp = real_path(path);
-		sanitized = xmalloc(len + strlen(temp) + 1);
-		strcpy(sanitized, temp);
+		char *npath;
+
+		npath = xmalloc(strlen(path) + 1);
 		if (remaining_prefix)
 			*remaining_prefix = 0;
+		if (normalize_path_copy_len(npath, path, remaining_prefix)) {
+			free(npath);
+			return NULL;
+		}
+		if (abspath_part_inside_repo(npath)) {
+			free(npath);
+			return NULL;
+		}
+
+		sanitized = xmalloc(strlen(npath) + 1);
+		strcpy(sanitized, npath);
+		free(npath);
 	} else {
 		sanitized = xmalloc(len + strlen(path) + 1);
 		if (len)
@@ -98,26 +110,10 @@ char *prefix_path_gently(const char *prefix, int len,
 		strcpy(sanitized + len, path);
 		if (remaining_prefix)
 			*remaining_prefix = len;
-	}
-	if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix))
-		goto error_out;
-	if (is_absolute_path(orig)) {
-		size_t root_len, len, total;
-		const char *work_tree = get_git_work_tree();
-		if (!work_tree)
-			goto error_out;
-		len = strlen(work_tree);
-		root_len = offset_1st_component(work_tree);
-		total = strlen(sanitized) + 1;
-		if (strncmp(sanitized, work_tree, len) ||
-		    (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
-		error_out:
+		if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
 			free(sanitized);
 			return NULL;
 		}
-		if (sanitized[len] == '/')
-			len++;
-		memmove(sanitized, sanitized + len, total - len);
 	}
 	return sanitized;
 }
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index c0a14f6..f04b82d 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -190,7 +190,7 @@ test_expect_success SYMLINKS 'real path works on symlinks' '
 	test "$sym" = "$(test-path-utils real_path "$dir2/syml")"
 '
 
-test_expect_failure SYMLINKS 'prefix_path works with absolute paths to work tree symlinks' '
+test_expect_success SYMLINKS 'prefix_path works with absolute paths to work tree symlinks' '
 	ln -s target symlink &&
 	test "$(test-path-utils prefix_path prefix "$(pwd)/symlink")" = "symlink"
 '
-- 
1.8.5.2