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Unix-literal "/" roots panic on Windows: four test fixtures, and writ's System layer TargetRoot #392
Description
On Windows, a Path built against a Unix-literal root "/" panics: filepath.Rel("/", "C:\...") cannot cross volumes, so fsroot.makePath's assert.Must fires. Found by the platform test matrix (#373) in the post-#377 remainder (57 failures, PR #389 leg).
Evidence
panic: fsroot.makePath: must: Rel: can't make C:\Users\RUNNER~1\...\decrypted.yaml relative to / (pkg/fsroot/root.go:699)
--- FAIL: TestReceipt_RestoreEncoded_JSONandYAML
Sites
Test fixtures (bucket 2) — fsroot.OpenWritableUnconfined("/") as a whole-filesystem root:
pkg/op/provider/encryption/receipt_test.go:25pkg/op/provider/git/provider_test.go:23,:40,:191
These want a root that can address absolute temp paths; on Windows "/" is not that. Fix shape: anchor the fixture root at t.TempDir() (confining the test properly as a bonus), or define what unconfined means cross-platform and use that.
Production default (bucket 1, larger) — cmd/writ/writ/layer.go:28 sets the System layer's TargetRoot: "/". writ's System-layer deployment has no Windows semantics; this is a design question (what is "System" on Windows?), not a literal to patch. The layer tests (layer_test.go, snapshot_test.go:267) inherit the same literal.
Suggested split
Fix the four test fixtures mechanically; charter the writ System-layer Windows question separately — it is product design, and it gates writ-on-Windows rather than CI greenness (the scenario suite already passes on windows-latest because deployment targets Home, not System).
Activity
David-Noble-at-work commentedon Aug 13, 2026
Enumeration correction before the fix lands: the issue said four fixture sites; the uncapped sweep found ten — the original grep was
head -8-capped. Full set, all now fixed onfix/unix-literal-roots:encryption/receipt_test.go(1),git/provider_test.go(3, via parameterizedtestActivation/newTestProvider),git/resource_input_test.go(2 — the Windows-shaped-path test now borrows the fixture root's own volume on Windows so the drive-colon shape survives without crossing volumes),git/resource_test.go(1,newResanchors at the path's own directory),git/receipt_test.go(1),git/checkout_pull_observe_test.go(2, plus the two/tmp/*literal inputs). The writ System-layerTargetRoot: "/"design question remains this issue's open half, untouched.test(git,encryption): anchor fixture roots at temp directories, not "…
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