Chuck 5beef0aa01 Improve first-time install error diagnostics and resilience (#369) ...

* fix(install): don't let outer ERR trap mask first_time_install.sh failures

set +e alone doesn't suppress bash's ERR trap, so any non-zero exit from
first_time_install.sh inside the one-shot installer immediately triggered
the outer on_error handler with a generic "Main installation, line 370"
message — before the script could report the real exit code or point to
logs/. Suspend the trap for that block so the existing if/else handling
runs instead.

* feat(install): surface root cause of web dependency install failures

install_dependencies_apt.py previously reported only which packages
failed, not why - the actual apt/pip error was discarded (apt) or
could scroll out of the on_error log tail (pip), leaving "Step 7:
Install web interface dependencies (line 915)" as the only visible
detail.

Capture command output for each install attempt and print a compact
DEPENDENCY INSTALLATION FAILURES summary with the last lines of error
output per package. Also run the installer with `python3 -u` for
real-time, correctly-ordered logging, and widen the on_error tail from
50 to 100 lines so the summary isn't cut off.

* feat(install): harden first-time install against common Pi failure modes

- wait_for_apt_lock: apt_update/apt_install now wait (up to 3min) for
  unattended-upgrades to release the dpkg lock instead of failing
  outright with "Command failed after 3 attempts" right after first boot.
- check_disk_space: new pre-flight check (Step 1) so a full SD card fails
  fast with a clear message instead of a cryptic mid-build error.
- Step 6: wrap rpi-rgb-led-matrix git clone/submodule operations in retry
  for resilience to transient network issues.
- Step 6: capture `pip install .` build output and print the last 50
  lines on failure, so the actual cmake/compiler error is visible instead
  of just "Failed to install rpi-rgb-led-matrix Python package".

* fix(install): bound subprocess output and dedupe apt update in dependency installer

Address coderabbitai review on PR #369:
- _run() now streams combined stdout/stderr to a temp file and returns
  only the last ERROR_TAIL_LINES lines, instead of buffering full
  output in memory (Codacy also flagged the previous capture_output
  call as a subprocess-without-static-string security issue; the new
  call is annotated as safe since cmd is built from hardcoded args).
- `apt update` now runs once in main() instead of once per package
  needing an apt fallback.

* fix(install): suppress remaining Codacy subprocess false-positive

Codacy's Semgrep-based check still flagged the cmd-built subprocess.run
call as "without a static string" even with the Bandit nosec applied.
Add a nosemgrep marker alongside it - cmd is always a hardcoded
apt/pip argument list, never user input.

* fix(install): correctly detect already-installed dateutil/websocket-client

Address remaining coderabbitai findings on PR #369:
- check_package_installed() did __import__(package_name) directly, but
  python-dateutil and websocket-client import as dateutil/websocket. Both
  always failed the "already installed" check and were reinstalled on
  every run. Add an IMPORT_NAME_MAP for the mismatched names.
- _run() still read the entire temp file into memory before slicing the
  tail. Stream it line-by-line into a deque(maxlen=ERROR_TAIL_LINES)
  instead so memory use stays bounded for very chatty commands.

---------

Co-authored-by: Chuck <chuck@example.com>

2026-06-11 18:12:35 -04:00

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