Poor man's Bazel disk-cache age based eviction

README.md

Poor man's Bazel disk-cache age based eviction

Usage:

1. Edit BAZEL_BIN_PATH in the script to match your setup
2. Add build --disk_cache=~/.cache/bazel/disk_cache to your .bazelrc. Edit the path to your preferences and the variable value accordingly.
3. Edit the value of BAZEL_DISK_CACHE_MAX_AGE to match your preferences.

• Higher values means more cache hits over time
• Lower values means less disk-space and less cleanup time and CPU load

4. Finally source the scriupt from your shell profile

bazel_disk_cache_wrapper.sh

#!/usr/bin/env zsh

export BAZEL_BIN_PATH="$HOME/.local/bin/bazel"              # edit according to your system
export BAZEL_DISK_CACHE_DIR="$HOME/.cache/bazel/disk_cache" # ~/.bazelrc <- build --disk_cache=~/.cache/bazel/disk_cache
export BAZEL_DISK_CACHE_MAX_AGE="14d"                       # edit to your prefs

function bazel_with_disk_cache_guard() {
  ("$BAZEL_BIN_PATH" "$@")
  local rc="$?"

  (find "$BAZEL_DISK_CACHE_DIR" -type f -mtime +$BAZEL_DISK_CACHE_MAX_AGE -delete &)
  if [[ "$?" != "0" ]]; then
    echo "WARNING: [${funcstack[1]}] disk cache cleanup failed"
  fi

  return "$rc"
}

alias bazel='bazel_with_disk_cache_guard'