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package contenthash
import (
"fmt"
"os"
"path"
"path/filepath"
"runtime"
"testing"
"github.com/stretchr/testify/require"
)
func TestRootPathSymlinks(t *testing.T) {
t.Parallel()
tmpdir := t.TempDir()
// Make the following tree:
// /
// |- target/
mkdirAll(t, tmpdir, "target")
// |- link1
// |- sub/
// |- notaloop -> ../target
// |- final -> /target
mkdirAll(t, tmpdir, "link1")
mkdirAll(t, tmpdir, "link1/sub")
symlink(t, tmpdir, "link1/notaloop", "../target")
symlink(t, tmpdir, "link1/final", "/target")
// |- link2
// |- link1 -> /link1/
// |- link1sub -> /link1/sub/
// |- notaloop -> ./link1sub/../notaloop
// |- notaloop_abs -> /link2/link1sub/../notaloop
// |- notaloop2 -> ./link1/../link1/notaloop
// |- notaloop2_abs -> /link2/link1/../link1/notaloop
// |- target -> ./link1sub/../final
// |- target_abs -> /link2/link1sub/../final
// |- target2 -> ./link1/../link1/final
// |- target2_abs -> /link2/link1/../link1/final
mkdirAll(t, tmpdir, "link2")
symlink(t, tmpdir, "link2/link1", "/link1/")
symlink(t, tmpdir, "link2/link1sub", "/link1/sub/")
symlink(t, tmpdir, "link2/notaloop", "./link1sub/../notaloop")
symlink(t, tmpdir, "link2/notaloop_abs", "/link2/link1sub/../notaloop")
symlink(t, tmpdir, "link2/notaloop2", "./link1/../link1/notaloop")
symlink(t, tmpdir, "link2/notaloop2_abs", "/link2/link1/../link1/notaloop")
symlink(t, tmpdir, "link2/target", "./link1sub/../final")
symlink(t, tmpdir, "link2/target_abs", "/link2/link1sub/../final")
symlink(t, tmpdir, "link2/target2", "./link1/../link1/final")
symlink(t, tmpdir, "link2/target2_abs", "/link2/link1/../link1/final")
// |- link3 -> /link2
symlink(t, tmpdir, "link3", "/link2")
for _, test := range []struct {
path string
followTrailing bool
expected string
}{
{"target", true, "/target"},
{"target", false, "/target"},
{"link1/notaloop", true, "/target"},
{"link1/notaloop", false, "/link1/notaloop"},
{"link1/final", true, "/target"},
{"link1/final", false, "/link1/final"},
{"link2/notaloop", true, "/target"},
{"link2/notaloop", false, "/link2/notaloop"},
{"link2/notaloop_abs", true, "/target"},
{"link2/notaloop_abs", false, "/link2/notaloop_abs"},
{"link2/notaloop2", true, "/target"},
{"link2/notaloop2", false, "/link2/notaloop2"},
{"link2/notaloop2_abs", true, "/target"},
{"link2/notaloop2_abs", false, "/link2/notaloop2_abs"},
{"link2/target", true, "/target"},
{"link2/target", false, "/link2/target"},
{"link2/target_abs", true, "/target"},
{"link2/target_abs", false, "/link2/target_abs"},
{"link2/target2", true, "/target"},
{"link2/target2", false, "/link2/target2"},
{"link2/target2_abs", true, "/target"},
{"link2/target2_abs", false, "/link2/target2_abs"},
{"link2/link1sub/../notaloop", true, "/target"}, // link2/notaloop
{"link2/link1sub/../notaloop", false, "/link1/notaloop"}, // link2/notaloop
{"link2/link1/../link1/notaloop", true, "/target"}, // link2/notaloop2
{"link2/link1/../link1/notaloop", false, "/link1/notaloop"}, // link2/notaloop2
{"link2/link1sub/../final", true, "/target"}, // link2/target
{"link2/link1sub/../final", false, "/link1/final"}, // link2/target
{"link2/link1/../link1/final", true, "/target"}, // link2/target2
{"link2/link1/../link1/final", false, "/link1/final"}, // link2/target2
{"link3/target", true, "/target"},
{"link3/target", false, "/link2/target"},
{"link3/target_abs", true, "/target"},
{"link3/target_abs", false, "/link2/target_abs"},
{"link3/target2", true, "/target"},
{"link3/target2", false, "/link2/target2"},
{"link3/target2_abs", true, "/target"},
{"link3/target2_abs", false, "/link2/target2_abs"},
{"link3/link1sub/../notaloop", true, "/target"}, // link3/notaloop
{"link3/link1sub/../notaloop", false, "/link1/notaloop"}, // link3/notaloop
{"link3/link1/../link1/notaloop", true, "/target"}, // link3/notaloop2
{"link3/link1/../link1/notaloop", false, "/link1/notaloop"}, // link3/notaloop2
{"link3/link1sub/../final", true, "/target"}, // link3/target
{"link3/link1sub/../final", false, "/link1/final"}, // link3/target
{"link3/link1/../link1/final", true, "/target"}, // link3/target2
{"link3/link1/../link1/final", false, "/link1/final"}, // link3/target2
} {
test := test // capture range variable
t.Run(fmt.Sprintf("resolve(%q,followTrailing=%v)", test.path, test.followTrailing), func(t *testing.T) {
t.Parallel()
resolvedPath, err := rootPath(tmpdir, test.path, test.followTrailing, nil)
require.NoError(t, err)
expectedPath := filepath.Join(tmpdir, filepath.FromSlash(test.expected))
require.Equal(t, expectedPath, resolvedPath)
})
}
}
func mkdirAll(t *testing.T, root, path string) {
path = filepath.FromSlash(path)
err := os.MkdirAll(filepath.Join(root, path), 0755)
require.NoError(t, err)
}
func symlink(t *testing.T, root, linkname, target string) {
linkname = filepath.FromSlash(linkname)
// We need to add a dummy drive letter to emulate absolute symlinks on
// Windows.
if runtime.GOOS == "windows" && path.IsAbs(target) {
target = "Z:" + filepath.FromSlash(target)
} else {
target = filepath.FromSlash(target)
}
dir, _ := filepath.Split(linkname)
mkdirAll(t, root, dir)
fullLinkname := filepath.Join(root, linkname)
err := os.Symlink(target, fullLinkname)
require.NoError(t, err)
// Windows seems to automatically change our /foo/../bar symlinks to /bar,
// causing some tests to fail. Technically we only care about this symlink
// behaviour on Linux (since we implemented it this way to keep Linux
// compatibility), so if our symlink has the wrong target we can just skip
// the test.
actualTarget, err := os.Readlink(fullLinkname)
require.NoError(t, err)
if actualTarget != target {
fn := t.Skipf
if runtime.GOOS != "windows" {
fn = t.Fatalf
}
fn("created link had the wrong contents -- %s -> %s", target, actualTarget)
}
}
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