README.md

@@ -13,8 +13,8 @@ Homesick is sorta like [rip](http://github.com/defunkt/rip), but for dotfiles. I
 
 We call a repository that is compatible with homesick to be a 'castle'. To act as a castle, a repository must be organized like so:
 
-* Contains a 'home' directory
-* 'home' contains any number of files and directories that begin with '.'
+- Contains a 'home' directory
+- 'home' contains any number of files and directories that begin with '.'
 
 To get started, install homesick first:
 
@@ -82,6 +82,35 @@ If you ever want to see what version of homesick you have type:
 
     homesick version|-v|--version
 
+## Docker Behavior Validation (Ruby vs Go)
+
+To preserve behavior while migrating from Ruby to Go, this repository includes a containerized behavior suite that runs Homesick commands in a clean environment and validates filesystem and git outcomes.
+
+The suite creates a dedicated git repository inside the container to act as a test castle fixture, then validates behavior for:
+
+- clone
+- link / unlink
+- track
+- list / show_path
+- status / diff
+- version
+
+Run against the current Ruby implementation:
+
+    ./script/run-behavior-suite-docker.sh
+
+Show full command output (including internal Homesick status lines) when needed:
+
+    ./script/run-behavior-suite-docker.sh --verbose
+
+This runner now builds an Alpine-based container and installs runtime dependencies with `apk`, so behavior validation is not tied to a Ruby base image.
+
+Run against a future Go binary (example path):
+
+    HOMESICK_CMD="/workspace/dist/homesick" ./script/run-behavior-suite-docker.sh
+
+The command under test is controlled with the `HOMESICK_CMD` environment variable. By running the same suite for both implementations, you can verify parity at the behavior level.
+
 ## .homesick_subdir
 
 `homesick link` basically makes symlink to only first depth in `castle/home`. If you want to link nested files/directories, please use .homesick_subdir.
@@ -164,17 +193,17 @@ and castle
 
 Homesick is tested on the following Ruby versions:
 
-* 2.2.6
-* 2.3.3
-* 2.4.0
+- 2.2.6
+- 2.3.3
+- 2.4.0
 
 ## Note on Patches/Pull Requests
 
-* Fork the project.
-* Make your feature addition or bug fix.
-* Add tests for it. This is important so I don't break it in a future version unintentionally.
-* Commit, do not mess with rakefile, version, or history.  (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
-* Send me a pull request. Bonus points for topic branches.
+- Fork the project.
+- Make your feature addition or bug fix.
+- Add tests for it. This is important so I don't break it in a future version unintentionally.
+- Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
+- Send me a pull request. Bonus points for topic branches.
 
 ## Need homesick without the ruby dependency?
 

docker/behavior/Dockerfile

@@ -0,0 +1,13 @@
+FROM alpine:3.21
+
+RUN apk add --no-cache \
+    bash \
+    ca-certificates \
+    git \
+    ruby \
+    ruby-thor
+
+WORKDIR /workspace
+COPY . /workspace
+
+ENTRYPOINT ["/workspace/test/behavior/behavior_suite.sh"]

script/run-behavior-suite-docker.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${HOMESICK_CMD:=ruby /workspace/bin/homesick}"
+behavior_verbose="${BEHAVIOR_VERBOSE:-0}"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -v|--verbose)
+      echo "Enabling verbose output for behavior suite"
+      behavior_verbose=1
+      ;;
+    *)
+      echo "Unknown argument: $1" >&2
+      echo "Usage: $0 [--verbose]" >&2
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd "$script_dir/.." && pwd)"
+
+run_docker_build() {
+  echo "Building Docker image for behavior suite..."
+  local build_log
+
+  if [[ "$behavior_verbose" == "1" ]]; then
+    docker-buildx build -f "$repo_root/docker/behavior/Dockerfile" -t homesick-behavior:latest "$repo_root"
+    return
+  fi
+
+  build_log="$(mktemp)"
+  if ! docker-buildx build -f "$repo_root/docker/behavior/Dockerfile" -t homesick-behavior:latest "$repo_root" >"$build_log" 2>&1; then
+    cat "$build_log" >&2
+    rm -f "$build_log"
+    exit 1
+  fi
+
+  rm -f "$build_log"
+}
+
+run_docker_build
+
+echo "Running behavior suite in Docker container..."
+docker run --rm \
+  -e HOMESICK_CMD="$HOMESICK_CMD" \
+  -e BEHAVIOR_VERBOSE="$behavior_verbose" \
+  homesick-behavior:latest

test/behavior/behavior_suite.sh

@@ -0,0 +1,193 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${HOMESICK_CMD:=ruby /workspace/bin/homesick}"
+: "${BEHAVIOR_VERBOSE:=0}"
+
+RUN_OUTPUT=""
+
+fail() {
+  echo "FAIL: $*" >&2
+  exit 1
+}
+
+pass() {
+  if [[ -t 1 ]]; then
+    printf '  \033[32mPassed\033[0m\n'
+  else
+    echo "  Passed"
+  fi
+}
+
+parse_args() {
+  while [[ $# -gt 0 ]]; do
+    case "$1" in
+      -v|--verbose)
+        BEHAVIOR_VERBOSE=1
+        ;;
+      *)
+        fail "unknown argument: $1"
+        ;;
+    esac
+    shift
+  done
+}
+
+run_git() {
+  if [[ "$BEHAVIOR_VERBOSE" == "1" ]]; then
+    git "$@"
+  else
+    git "$@" >/dev/null 2>&1
+  fi
+}
+
+assert_path_exists() {
+  local path="$1"
+  [[ -e "$path" ]] || fail "expected path to exist: $path"
+}
+
+assert_path_missing() {
+  local path="$1"
+  [[ ! -e "$path" ]] || fail "expected path to be missing: $path"
+}
+
+assert_symlink_target() {
+  local link_path="$1"
+  local expected_target="$2"
+  [[ -L "$link_path" ]] || fail "expected symlink: $link_path"
+  local actual_target
+  actual_target="$(readlink "$link_path")"
+  [[ "$actual_target" == "$expected_target" ]] || fail "expected symlink target '$expected_target' but got '$actual_target'"
+}
+
+run_homesick() {
+  local out_file
+  local output
+  out_file="$(mktemp)"
+  if ! bash -lc "$HOMESICK_CMD $*" >"$out_file" 2>&1; then
+    cat "$out_file" >&2
+    rm -f "$out_file"
+    fail "homesick command failed: $*"
+  fi
+
+  output="$(cat "$out_file")"
+  RUN_OUTPUT="$output"
+
+  if [[ "$BEHAVIOR_VERBOSE" == "1" && -n "$output" ]]; then
+    printf '%s\n' "$output"
+  fi
+
+  rm -f "$out_file"
+}
+
+setup_remote_castle() {
+  local remote_dir="$1"
+  local work_dir="$2"
+
+  mkdir -p "$remote_dir"
+  run_git init --bare "$remote_dir/base.git"
+
+  mkdir -p "$work_dir/base"
+  pushd "$work_dir/base" >/dev/null
+  run_git init
+  run_git config user.email "behavior@test.local"
+  run_git config user.name "Behavior Test"
+
+  mkdir -p home/.config/myapp
+  echo "set number" > home/.vimrc
+  echo "export PATH=\"$PATH:$HOME/bin\"" > home/.zshrc
+  echo "option=true" > home/.config/myapp/config.toml
+  printf '.config\n' > .homesick_subdir
+
+  run_git add .
+  run_git commit -m "initial castle"
+  run_git remote add origin "$remote_dir/base.git"
+  run_git push -u origin master
+  popd >/dev/null
+}
+
+setup_local_test_file() {
+  mkdir -p "$HOME/.local/bin"
+  echo "#!/usr/bin/env bash" > "$HOME/.local/bin/tool"
+  chmod +x "$HOME/.local/bin/tool"
+}
+
+run_suite() {
+  local tmp_root
+  tmp_root="$(mktemp -d)"
+  trap "rm -rf '$tmp_root'" EXIT
+
+  export HOME="$tmp_root/home"
+  mkdir -p "$HOME"
+
+  local remote_root="$tmp_root/remote"
+  local work_root="$tmp_root/work"
+
+  setup_remote_castle "$remote_root" "$work_root"
+
+  echo "[1/7] clone"
+  run_homesick "clone file://$remote_root/base.git parity-castle"
+  assert_path_exists "$HOME/.homesick/repos/parity-castle/.git"
+  assert_path_exists "$HOME/.homesick/repos/parity-castle/home/.vimrc"
+  pass
+
+  echo "[2/7] link"
+  run_homesick "link parity-castle"
+  assert_symlink_target "$HOME/.vimrc" "$HOME/.homesick/repos/parity-castle/home/.vimrc"
+  assert_symlink_target "$HOME/.zshrc" "$HOME/.homesick/repos/parity-castle/home/.zshrc"
+  assert_path_exists "$HOME/.config/myapp"
+  assert_symlink_target "$HOME/.config/myapp" "$HOME/.homesick/repos/parity-castle/home/.config/myapp"
+  pass
+
+  echo "[3/7] unlink"
+  run_homesick "unlink parity-castle"
+  assert_path_missing "$HOME/.vimrc"
+  assert_path_missing "$HOME/.zshrc"
+  assert_path_exists "$HOME/.config"
+  assert_path_missing "$HOME/.config/myapp"
+  pass
+
+  echo "[4/7] relink + track"
+  run_homesick "link parity-castle"
+  setup_local_test_file
+  run_homesick "track $HOME/.local/bin/tool parity-castle"
+  assert_symlink_target "$HOME/.local/bin/tool" "$HOME/.homesick/repos/parity-castle/home/.local/bin/tool"
+  assert_path_exists "$HOME/.homesick/repos/parity-castle/.homesick_subdir"
+  grep -q "^.local/bin$" "$HOME/.homesick/repos/parity-castle/.homesick_subdir" || fail "expected .homesick_subdir to contain .local/bin"
+  pass
+
+  echo "[5/7] list and show_path"
+  local list_output
+  run_homesick "list"
+  list_output="$RUN_OUTPUT"
+  [[ "$list_output" == *"parity-castle"* ]] || fail "expected list output to include parity-castle"
+  local show_path_output
+  run_homesick "show_path parity-castle"
+  show_path_output="$RUN_OUTPUT"
+  [[ "$show_path_output" == *"$HOME/.homesick/repos/parity-castle"* ]] || fail "expected show_path output to include parity-castle path"
+  pass
+
+  echo "[6/7] status and diff"
+  echo "change" >> "$HOME/.vimrc"
+  local status_output
+  run_homesick "status parity-castle"
+  status_output="$RUN_OUTPUT"
+  [[ "$status_output" == *"modified:"* ]] || fail "expected status output to include modified file"
+  local diff_output
+  run_homesick "diff parity-castle"
+  diff_output="$RUN_OUTPUT"
+  [[ "$diff_output" == *"diff --git"* ]] || fail "expected diff output to include git diff"
+  pass
+
+  echo "[7/7] version"
+  local version_output
+  run_homesick "version"
+  version_output="$RUN_OUTPUT"
+  [[ "$version_output" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || fail "expected semantic version output, got: $version_output"
+  pass
+
+  echo "PASS: behavior suite completed for command: $HOMESICK_CMD"
+}
+
+parse_args "$@"
+run_suite