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internal/testenv: probe for symlink on wasip1
Certain WASI runtimes do not support generic symlinks, and instead return permission errors when they are attempted. Perform a runtime probe of symlink support in hasSymlink on wasip1 to determine whether the runtime supports generic symlinks. Also perform the same probe on android. For #59583 Change-Id: Iae5b704e670650d38ee350a5a98f99dcce8b5b28 Reviewed-on: https://go-review.googlesource.com/c/go/+/490115 Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Reviewed-by: Achille Roussel <achille.roussel@gmail.com> TryBot-Bypass: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Reviewed-by: Bryan Mills <bcmills@google.com>
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@ -387,7 +387,7 @@ func HasSymlink() bool {
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func MustHaveSymlink(t testing.TB) {
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ok, reason := hasSymlink()
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if !ok {
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t.Skipf("skipping test: cannot make symlinks on %s/%s%s", runtime.GOOS, runtime.GOARCH, reason)
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t.Skipf("skipping test: cannot make symlinks on %s/%s: %s", runtime.GOOS, runtime.GOARCH, reason)
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}
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}
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@ -8,6 +8,7 @@ package testenv
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import (
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"errors"
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"io/fs"
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"os"
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)
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@ -16,5 +17,5 @@ import (
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var Sigquit = os.Kill
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func syscallIsNotSupported(err error) bool {
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return errors.Is(err, errors.ErrUnsupported)
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return errors.Is(err, fs.ErrPermission) || errors.Is(err, errors.ErrUnsupported)
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}
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@ -7,13 +7,39 @@
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package testenv
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import (
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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)
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func hasSymlink() (ok bool, reason string) {
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switch runtime.GOOS {
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case "android", "plan9":
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case "plan9":
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return false, ""
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case "android", "wasip1":
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// For wasip1, some runtimes forbid absolute symlinks,
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// or symlinks that escape the current working directory.
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// Perform a simple test to see whether the runtime
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// supports symlinks or not. If we get a permission
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// error, the runtime does not support symlinks.
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dir, err := os.MkdirTemp("", "")
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if err != nil {
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return false, ""
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}
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defer func() {
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_ = os.RemoveAll(dir)
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}()
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fpath := filepath.Join(dir, "testfile.txt")
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if err := os.WriteFile(fpath, nil, 0644); err != nil {
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return false, ""
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}
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if err := os.Symlink(fpath, filepath.Join(dir, "testlink")); err != nil {
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if SyscallIsNotSupported(err) {
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return false, fmt.Sprintf("symlinks unsupported: %s", err.Error())
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}
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return false, ""
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}
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}
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return true, ""
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