feat(detector): implement ASDF detection#4
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June 29, 2026 17:13
Adds the asdf-vm manager (4/8) to the detector registry. ASDF is a
true binary (unlike NVM), so detection follows the same pattern as
FNM/Volta: a no-subprocess Detect() probe plus a runShell-backed
Version() and ListInstalled().
Detection strategy (any of):
1. `asdf` on PATH (via platform.LookupManagerBinary)
2. $ASDF_DATA_DIR env var is set
3. ~/.asdf directory exists on disk
Implementation notes:
- Version() runs `asdf version` (urfave/cli style, not --version)
and strips an optional 'v' prefix defensively.
- ListInstalled() runs `asdf list nodejs` and parses the
two-space-indented lines, where the current version is marked
with ' *'. Skips the 'No compatible versions installed' message
rather than aborting the parse.
- asdfDataDir() respects $ASDF_DATA_DIR (the data dir override)
before falling back to $HOME/.asdf, using the homeDir seam
already added by Volta for cross-platform test isolation.
- Mutation methods (Install, Uninstall, Use, SetDefault,
GlobalNpmPrefix) return ErrASDFNotImplemented — the same
sentinel pattern used by other Phase-1 managers.
Tests: 19 mocked tests covering parseASDFVersion (5), parseASDFInstalled
(6), the four Detect() branches (4), method-level coverage for
Name/Version/ListInstalled (7), and the not-implemented stubs (1).
TestASDF_DoesNotInvokeRunShellOnDetect explicitly verifies that
Detect() never spawns a subprocess on any of its happy paths.
- Replace 'Defence' with 'Defense' to satisfy the misspell linter rule. - Use platform-correct binary name (asdf.exe on Windows, asdf elsewhere) so the stub binary is found by exec.LookPath on Windows. - Replace PATH with a single entry pointing at the stub dir, rather than prepending — prevents a pre-existing asdf on the CI runner's PATH (notably the GitHub Actions Windows image) from shadowing the stub.
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Summary
Adds ASDF (4/8) to the node-version-updater detector registry. ASDF is a true binary (unlike NVM), so detection follows the same pattern as FNM/Volta: a no-subprocess
Detect()probe plus arunShell-backedVersion()andListInstalled().Detection strategy
Detect()returns true when any of:asdfis onPATH(viaplatform.LookupManagerBinary)$ASDF_DATA_DIRenv var is set~/.asdfdirectory exists on diskAll three branches are pure-PATH/on-disk checks — no subprocesses.
TestASDF_DoesNotInvokeRunShellOnDetectenforces this with at.Fatalfif any branch reachesrunShell.Implementation
Version()— runsasdf version(urfave/cli style, not--version) and strips an optionalvprefix defensively.ListInstalled()— runsasdf list nodejsand parses the two-space-indented lines, where the current version is marked with*. Skips theNo compatible versions installedmessage rather than aborting the parse.asdfDataDir()— respects$ASDF_DATA_DIR(the data dir override) before falling back to$HOME/.asdf, using thehomeDirseam already added by Volta for cross-platform test isolation.Install,Uninstall,Use,SetDefault,GlobalNpmPrefix) returnErrASDFNotImplemented— same sentinel pattern as the other Phase-1 managers.Tests
19 mocked tests across:
parseASDFVersionparseASDFInstalledDetectbranches$ASDF_DATA_DIR, empty env falls throughName,Version× 4,ListInstalled× 3ErrASDFNotImplementedasdfDataDirenv-wins, home-fallback, empty-home, whitespace-trim, no-shell-on-PATHgo test ./...passes;gofmtandgo vetclean.Out of scope (Phase 1)
Mutation commands — Install / Uninstall / Use / SetDefault / GlobalNpmPrefix — are stubbed with
ErrASDFNotImplementedper the project plan. They will be implemented when the upgrade command lands in Phase 4.Part of the Phase 1 detector rollout (FNM #1, NVM #2, Volta #3, this one #4).