git-compat-util: add xstrdup_or_null helper

diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index 92976e0402ff5cd017accc604243a2a50b54bc29..c0143a0a70b7d3dc213b691aecea6b3fffbc5844 100755 (executable)
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -8,13 +8,13 @@ test_description='Test various path utilities'
 . ./test-lib.sh
 
 norm_path() {
-       expected=$(test-path-utils mingw_path "$2")
+       expected=$(test-path-utils print_path "$2")
        test_expect_success $3 "normalize path: $1 => $2" \
        "test \"\$(test-path-utils normalize_path_copy '$1')\" = '$expected'"
 }
 
 relative_path() {
-       expected=$(test-path-utils mingw_path "$3")
+       expected=$(test-path-utils print_path "$3")
        test_expect_success $4 "relative path: $1 $2 => $3" \
        "test \"\$(test-path-utils relative_path '$1' '$2')\" = '$expected'"
 }
@@ -190,6 +190,27 @@ test_expect_success SYMLINKS 'real path works on symlinks' '
        test "$sym" = "$(test-path-utils real_path "$dir2/syml")"
 '
 
+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"
+'
+
+test_expect_success 'prefix_path works with only absolute path to work tree' '
+       echo "" >expected &&
+       test-path-utils prefix_path prefix "$(pwd)" >actual &&
+       test_cmp expected actual
+'
+
+test_expect_success 'prefix_path rejects absolute path to dir with same beginning as work tree' '
+       test_must_fail test-path-utils prefix_path prefix "$(pwd)a"
+'
+
+test_expect_success SYMLINKS 'prefix_path works with absolute path to a symlink to work tree having  same beginning as work tree' '
+       git init repo &&
+       ln -s repo repolink &&
+       test "a" = "$(cd repo && test-path-utils prefix_path prefix "$(pwd)/../repolink/a")"
+'
+
 relative_path /foo/a/b/c/      /foo/a/b/       c/
 relative_path /foo/a/b/c/      /foo/a/b        c/
 relative_path /foo/a//b//c/    ///foo/a/b//    c/              POSIX
@@ -210,6 +231,10 @@ relative_path foo/a/b/             foo/a/b         ./
 relative_path foo/a            foo/a/b         ../
 relative_path foo/x/y          foo/a/b         ../../x/y
 relative_path foo/a/c          foo/a/b         ../c
+relative_path foo/a/b          /foo/x/y        foo/a/b
+relative_path /foo/a/b         foo/x/y         /foo/a/b
+relative_path d:/a/b           D:/a/c          ../b            MINGW
+relative_path C:/a/b           D:/a/c          C:/a/b          MINGW
 relative_path foo/a/b          "<empty>"       foo/a/b
 relative_path foo/a/b          "<null>"        foo/a/b
 relative_path "<empty>"                /foo/a/b        ./