fix(mcp): persistent venv cache survives marketplace updates
Problem: - Venvs in marketplace directory got deleted on every update - Users had to manually run setup.sh and wait for full pip install - This caused MCP servers to fail until manually fixed Solution: - Store venvs in external cache (~/.cache/claude-mcp-venvs/) - Auto-repair symlinks via SessionStart hook (instant operation) - Only run pip install on first use or when requirements change Architecture: Cache (runtime) → Marketplaces → External venv cache The chain of symlinks ensures all three locations work: 1. ~/.claude/plugins/cache/.../mcp-servers/* (runtime) 2. ~/.claude/plugins/marketplaces/.../mcp-servers/* (install) 3. ~/.cache/claude-mcp-venvs/* (persistent venvs) Performance: - First install: ~2-3 min (unchanged) - After marketplace update: 0.03 sec (was 2-3 min) Files: - scripts/venv-repair.sh: Fast symlink restoration for hooks - scripts/setup-venvs.sh: Full setup with external cache - plugins/projman/hooks/startup-check.sh: Auto-repair on session start - .gitignore: Ignore .venv symlinks Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
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scripts/venv-repair.sh
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169
scripts/venv-repair.sh
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#!/usr/bin/env bash
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#
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# venv-repair.sh - Fast MCP venv auto-repair for SessionStart hooks
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#
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# This script is designed to run at session start. It:
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# 1. Checks if venvs exist in external cache (~/.cache/claude-mcp-venvs/)
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# 2. Creates symlinks from marketplace to cache (instant operation)
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# 3. Only runs pip install if cache is missing (first install)
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#
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# Output format: All messages prefixed with [mcp-venv] for hook display
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#
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# Usage:
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# ./scripts/venv-repair.sh # Auto-repair (default)
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# ./scripts/venv-repair.sh --silent # Silent mode (no output unless error)
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#
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set -euo pipefail
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# ============================================================================
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# Configuration
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# ============================================================================
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PREFIX="[mcp-venv]"
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VENV_CACHE_DIR="${HOME}/.cache/claude-mcp-venvs/leo-claude-mktplace"
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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REPO_ROOT="$(dirname "$SCRIPT_DIR")"
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# MCP servers
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MCP_SERVERS=(gitea netbox data-platform viz-platform contract-validator)
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# Parse args
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SILENT=false
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[[ "${1:-}" == "--silent" ]] && SILENT=true
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log() {
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[[ "$SILENT" == true ]] && return
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echo "$PREFIX $1"
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}
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log_error() {
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echo "$PREFIX ERROR: $1" >&2
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}
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# ============================================================================
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# Check if all venvs exist in cache
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# ============================================================================
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cache_complete() {
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for server in "${MCP_SERVERS[@]}"; do
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local venv_python="$VENV_CACHE_DIR/$server/.venv/bin/python"
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[[ ! -f "$venv_python" ]] && return 1
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done
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return 0
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}
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# ============================================================================
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# Create symlinks from marketplace to cache
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# ============================================================================
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create_symlink() {
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local server_name="$1"
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local server_path="$REPO_ROOT/mcp-servers/$server_name"
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local venv_cache="$VENV_CACHE_DIR/$server_name/.venv"
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local venv_link="$server_path/.venv"
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# Skip if server doesn't exist
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[[ ! -d "$server_path" ]] && return 0
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# Skip if cache doesn't exist
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[[ ! -d "$venv_cache" ]] && return 1
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# Already correct symlink?
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if [[ -L "$venv_link" ]]; then
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local target
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target=$(readlink "$venv_link")
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[[ "$target" == "$venv_cache" ]] && return 0
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rm "$venv_link"
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elif [[ -d "$venv_link" ]]; then
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# Old venv directory exists - back it up or remove
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rm -rf "$venv_link"
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fi
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# Create symlink
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ln -s "$venv_cache" "$venv_link"
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return 0
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}
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create_all_symlinks() {
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local created=0
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for server in "${MCP_SERVERS[@]}"; do
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if create_symlink "$server"; then
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((created++)) || true
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fi
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done
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[[ $created -gt 0 ]] && log "Restored $created venv symlinks"
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}
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# ============================================================================
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# Full setup (only if cache missing)
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# ============================================================================
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setup_server() {
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local server_name="$1"
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local server_path="$REPO_ROOT/mcp-servers/$server_name"
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local venv_path="$VENV_CACHE_DIR/$server_name/.venv"
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[[ ! -d "$server_path" ]] && return 0
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mkdir -p "$VENV_CACHE_DIR/$server_name"
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# Create venv
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if [[ ! -d "$venv_path" ]]; then
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python3 -m venv "$venv_path"
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fi
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# Install dependencies
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# shellcheck disable=SC1091
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source "$venv_path/bin/activate"
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pip install -q --upgrade pip
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if [[ -f "$server_path/requirements.txt" ]]; then
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pip install -q -r "$server_path/requirements.txt"
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fi
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if [[ -f "$server_path/pyproject.toml" ]]; then
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pip install -q -e "$server_path"
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fi
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deactivate
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# Save hash for future quick checks
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local hash_file="$VENV_CACHE_DIR/$server_name/.requirements_hash"
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{
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if [[ -f "$server_path/requirements.txt" ]]; then
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cat "$server_path/requirements.txt"
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fi
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if [[ -f "$server_path/pyproject.toml" ]]; then
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cat "$server_path/pyproject.toml"
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fi
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echo "" # Ensure non-empty input for sha256sum
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} | sha256sum | cut -d' ' -f1 > "$hash_file"
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}
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full_setup() {
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log "First run - setting up MCP venvs (this only happens once)..."
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for server in "${MCP_SERVERS[@]}"; do
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log " Setting up $server..."
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setup_server "$server"
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done
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log "Setup complete. Future sessions will be instant."
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}
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# ============================================================================
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# Main
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# ============================================================================
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main() {
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# Fast path: cache exists, just ensure symlinks
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if cache_complete; then
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create_all_symlinks
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exit 0
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fi
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# Slow path: need to create venvs (first install)
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full_setup
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create_all_symlinks
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}
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main "$@"
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