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fleet/changes/50056-fma-install-scripts-ignore-errors
CarloandAllen Houchins 0594f653dd Propagate errors in macOS FMA install scripts (#50198)
<!-- Add the related story/sub-task/bug number, like Resolves #123, or
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**Related issue:** Resolves #50056

## Summary

macOS FMA install scripts never checked the exit code of the install
command (`installer -pkg` / `cp -R`) — the script's last statement is
always `relaunch_application`, which exits 0 — so a failed install
exited 0 and Fleet reported it installed.

**Generated scripts.** The generator now propagates failure: both
`installer -pkg` variants end with `|| exit $?`, and the `cp -R` path
exits non-zero on a failed copy, removes the partial copy (so a failed
fresh install isn't inventoried as the new version), and restores the
app it moved aside. Regenerated `outputs/` for non-frozen generated apps
are produced by the `ingest-maintained-apps` job, so they aren't
committed here.

**Custom scripts.** 9 of the 18 custom input scripts had the same bug
and are fixed with the same pattern: Google Chrome, Zoom, Microsoft
Edge, GitHub Desktop, Webex, Cycling '74 Max, Pd, Grammarly Desktop, and
P4V. The DMG-based ones also now fail before removing/moving the
existing app when the mount or staging copy fails, so a bad download
can't leave a host with nothing. Their `outputs/*/darwin.json` are
updated in the same commit (script content + recomputed 8-char sha256
ref, versions untouched), following the precedent of #49033. Docker
Desktop (`set -euo pipefail`), 1Password/Slack/LogiTune (installer is
the last statement), and the rest already propagated errors.

**Frozen apps.** The ingest job never rewrites frozen outputs, so the 10
frozen apps with generated scripts (adobe-acrobat-pro, comet, evernote,
firealpaca, keeper-password-manager, nvidia-geforce-now, pritunl,
vnc-viewer, wins, worksheet-crafter) had the fix applied directly to
their published `darwin.json` scripts — the exact text the current
generator would emit, with pinned versions/URLs/hashes untouched. The
11th frozen app (logi-options+) uses a custom script that was already
correct and in sync.

# Checklist for submitter

- [x] Changes file added for user-visible changes in `changes/`
(`changes/50056-fma-install-scripts-ignore-errors`).
- [x] Untrusted data interpolated into shell scripts is validated
against shell metacharacters. (No new untrusted interpolation: the guard
reuses the same curated cask-derived name the adjacent lines already
interpolate.)

## Testing

- [x] Added/updated automated tests (three generator tests: pkg,
pkg-with-choices, cp-R restore — the last now pins the exact emitted
block).
- [x] All 19 updated output manifests validated: embedded scripts pass
`bash -n`, refs match `sha256(script)[:8]`, refs map stays key-sorted
like Go's encoder.
- [x] QA'd all new/changed functionality manually.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* macOS Fleet-maintained app installations now fail fast when
installers, DMG extraction/mounting, or app copy steps error.
* If an upgrade fails, the system removes any partial app and restores
the previously installed version when available.
* Improved robustness during app staging/copying, including safer
handling of paths with spaces or special characters.
* **Tests**
* Added unit coverage to verify installer failure propagation and
rollback behavior.
* **Documentation**
* Clarified that the install-script error handling applies to both
generated and custom scripts, including already-published frozen apps.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Allen Houchins <allenhouchins@mac.com>
2026-07-30 14:22:02 -05:00

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- Fixed a bug where a failed macOS Fleet-maintained app install could be reported as successfully installed because the install script did not check the exit code of the command that installed the app. This covers generated install scripts, the custom install scripts used by some apps (including Google Chrome, Zoom, Microsoft Edge, and Webex), and the already-published scripts of frozen apps.