CDPATH breaks all bin/ scripts — cd outputs path to stdout, corrupting variable assignments #824

Bug

When CDPATH is set (common with zsh/bash users who use zoxide or custom navigation), every bin/ script silently fails because cd prints the resolved path to stdout, doubling the output of $(cd ... && pwd).

Root cause

Bash behavior: when CDPATH is set and cd resolves a directory through CDPATH, it prints the absolute path to stdout. This means:

# With CDPATH='.:/Users/me:/Users/me/Workspaces'
GSTACK_DIR="$(cd "$(dirname "$0")/.." && pwd)"
# cd outputs: /path/to/gstack
# pwd outputs: /path/to/gstack
# GSTACK_DIR = "/path/to/gstack\n/path/to/gstack" (two lines!)

This corrupts VERSION_FILE, CACHE_FILE, and every other path derived from GSTACK_DIR.

Specific impact on gstack-update-check: VERSION_FILE becomes a two-line string, [ -f "$VERSION_FILE" ] fails, LOCAL stays empty, script exits at line 68 (if [ -z "$LOCAL" ]; then exit 0; fi). Result: upgrade check always reports "up to date" regardless of actual version.

Affected scripts (18 total)

All scripts in bin/ that use the $(cd "$(dirname "$0")/.." && pwd) pattern:

• gstack-update-check (most impactful - blocks all upgrade detection)
• gstack-telemetry-log, gstack-telemetry-sync
• gstack-community-dashboard, gstack-uninstall
• gstack-timeline-log, gstack-timeline-read
• gstack-specialist-stats, gstack-review-log, gstack-review-read
• gstack-platform-detect, gstack-repo-mode, gstack-relink
• gstack-learnings-log, gstack-learnings-search
• gstack-extension, dev-setup, dev-teardown

Reproduction

export CDPATH='.:/Users/me:/Users/me/Workspaces'
~/.claude/skills/gstack/bin/gstack-update-check --force
# No output - silently exits, never checks remote VERSION

Fix

Redirect cd stdout to /dev/null in all path resolution patterns:

# Before (broken with CDPATH)
GSTACK_DIR="$(cd "$(dirname "$0")/.." && pwd)"

# After (works with any CDPATH)
GSTACK_DIR="$(cd "$(dirname "$0")/.." >/dev/null && pwd)"

Or use CDPATH= to suppress:

GSTACK_DIR="$(CDPATH= cd "$(dirname "$0")/.." && pwd)"

Environment

• gstack v0.15.9.0 (also affects v0.11.10.0 and likely all versions)
• macOS 14 (Darwin 24.6.0), bash 5.x
• CDPATH set via zoxide (eval "$(zoxide init bash)" adds alias cd=z)
• Also reproducible with manual CDPATH export

Workaround

Users can unset CDPATH before running gstack, but since gstack-update-check runs automatically in skill preambles, there is no practical workaround without patching the scripts.