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https://github.com/garrytan/gstack.git
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Garry Tan
533fdca1f2
Four new on-demand skills using Claude Code's PreToolUse hooks: - /careful: warns before destructive commands (rm -rf, DROP TABLE, force-push, etc.) - /freeze: blocks file edits outside a specified directory - /guard: composes both into one command - /unfreeze: clears freeze boundary without ending session Pure bash hook scripts with Python fallback for JSON edge cases. Safe exceptions for build artifacts (node_modules, dist, .next, etc.). Hook fire telemetry logs pattern name only (never command content). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
113 lines
4.2 KiB
Bash
Executable File
113 lines
4.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# check-careful.sh — PreToolUse hook for /careful skill
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# Reads JSON from stdin, checks Bash command for destructive patterns.
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# Returns {"permissionDecision":"ask","message":"..."} to warn, or {} to allow.
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set -euo pipefail
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# Read stdin (JSON with tool_input)
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INPUT=$(cat)
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# Extract the "command" field value from tool_input
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# Try grep/sed first (handles 99% of cases), fall back to Python for escaped quotes
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CMD=$(printf '%s' "$INPUT" | grep -o '"command"[[:space:]]*:[[:space:]]*"[^"]*"' | head -1 | sed 's/.*:[[:space:]]*"//;s/"$//' || true)
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# Python fallback if grep returned empty (e.g., escaped quotes in command)
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if [ -z "$CMD" ]; then
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CMD=$(printf '%s' "$INPUT" | python3 -c 'import sys,json; print(json.loads(sys.stdin.read()).get("tool_input",{}).get("command",""))' 2>/dev/null || true)
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fi
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# If we still couldn't extract a command, allow
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if [ -z "$CMD" ]; then
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echo '{}'
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exit 0
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fi
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# Normalize: lowercase for case-insensitive SQL matching
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CMD_LOWER=$(printf '%s' "$CMD" | tr '[:upper:]' '[:lower:]')
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# --- Check for safe exceptions (rm -rf of build artifacts) ---
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if printf '%s' "$CMD" | grep -qE 'rm\s+(-[a-zA-Z]*r[a-zA-Z]*\s+|--recursive\s+)' 2>/dev/null; then
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SAFE_ONLY=true
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RM_ARGS=$(printf '%s' "$CMD" | sed -E 's/.*rm\s+(-[a-zA-Z]+\s+)*//;s/--recursive\s*//')
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for target in $RM_ARGS; do
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case "$target" in
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*/node_modules|node_modules|*/\.next|\.next|*/dist|dist|*/__pycache__|__pycache__|*/\.cache|\.cache|*/build|build|*/\.turbo|\.turbo|*/coverage|coverage)
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;; # safe target
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-*)
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;; # flag, skip
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*)
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SAFE_ONLY=false
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break
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;;
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esac
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done
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if [ "$SAFE_ONLY" = true ]; then
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echo '{}'
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exit 0
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fi
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fi
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# --- Destructive pattern checks ---
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WARN=""
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PATTERN=""
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# rm -rf / rm -r / rm --recursive
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if printf '%s' "$CMD" | grep -qE 'rm\s+(-[a-zA-Z]*r|--recursive)' 2>/dev/null; then
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WARN="Destructive: recursive delete (rm -r). This permanently removes files."
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PATTERN="rm_recursive"
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fi
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# DROP TABLE / DROP DATABASE
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if [ -z "$WARN" ] && printf '%s' "$CMD_LOWER" | grep -qE 'drop\s+(table|database)' 2>/dev/null; then
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WARN="Destructive: SQL DROP detected. This permanently deletes database objects."
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PATTERN="drop_table"
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fi
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# TRUNCATE
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if [ -z "$WARN" ] && printf '%s' "$CMD_LOWER" | grep -qE '\btruncate\b' 2>/dev/null; then
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WARN="Destructive: SQL TRUNCATE detected. This deletes all rows from a table."
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PATTERN="truncate"
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fi
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# git push --force / git push -f
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if [ -z "$WARN" ] && printf '%s' "$CMD" | grep -qE 'git\s+push\s+.*(-f\b|--force)' 2>/dev/null; then
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WARN="Destructive: git force-push rewrites remote history. Other contributors may lose work."
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PATTERN="git_force_push"
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fi
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# git reset --hard
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if [ -z "$WARN" ] && printf '%s' "$CMD" | grep -qE 'git\s+reset\s+--hard' 2>/dev/null; then
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WARN="Destructive: git reset --hard discards all uncommitted changes."
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PATTERN="git_reset_hard"
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fi
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# git checkout . / git restore .
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if [ -z "$WARN" ] && printf '%s' "$CMD" | grep -qE 'git\s+(checkout|restore)\s+\.' 2>/dev/null; then
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WARN="Destructive: discards all uncommitted changes in the working tree."
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PATTERN="git_discard"
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fi
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# kubectl delete
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if [ -z "$WARN" ] && printf '%s' "$CMD" | grep -qE 'kubectl\s+delete' 2>/dev/null; then
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WARN="Destructive: kubectl delete removes Kubernetes resources. May impact production."
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PATTERN="kubectl_delete"
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fi
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# docker rm -f / docker system prune
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if [ -z "$WARN" ] && printf '%s' "$CMD" | grep -qE 'docker\s+(rm\s+-f|system\s+prune)' 2>/dev/null; then
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WARN="Destructive: Docker force-remove or prune. May delete running containers or cached images."
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PATTERN="docker_destructive"
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fi
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# --- Output ---
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if [ -n "$WARN" ]; then
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# Log hook fire event (pattern name only, never command content)
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mkdir -p ~/.gstack/analytics 2>/dev/null || true
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echo '{"event":"hook_fire","skill":"careful","pattern":"'"$PATTERN"'","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null || echo "unknown")'"}' >> ~/.gstack/analytics/skill-usage.jsonl 2>/dev/null || true
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WARN_ESCAPED=$(printf '%s' "$WARN" | sed 's/"/\\"/g')
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printf '{"permissionDecision":"ask","message":"[careful] %s"}\n' "$WARN_ESCAPED"
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else
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echo '{}'
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fi
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