ci: Refactor timelord action to use git-warp-time fallback

Updates the timelord action to fall back to git-warp-time when the cache
is completely empty, enabling timestamp restoration even on fresh builds.
Simplifies the interface by making inputs optional with sensible defaults
and adds Docker integration via buildkit-cache-dance.

.forgejo/actions/timelord/action.yml

@@ -1,46 +1,99 @@
 name: timelord
 description: |
-  Use timelord to set file timestamps
+  Use timelord to set file timestamps with git-warp-time fallback for cache misses
 inputs:
   key:
     description: |
       The key to use for caching the timelord data.
-      This should be unique to the repository and the runner.
-    required: true
-    default: timelord-v0
+    required: false
+    default: ''
   path:
     description: |
       The path to the directory to be timestamped.
-      This should be the root of the repository.
-    required: true
-    default: .
+    required: false
+    default: ''
+
+outputs:
+  database-path:
+    description: Path to timelord database
+    value: '${{ env.TIMELORD_CACHE_PATH }}'
 
 runs:
   using: composite
   steps:
-    - name: Cache timelord-cli installation
-      id: cache-timelord-bin
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/bin/timelord
-        key: timelord-cli-v3.0.1
-    - name: Install timelord-cli
-      uses: https://github.com/cargo-bins/cargo-binstall@main
-      if: steps.cache-timelord-bin.outputs.cache-hit != 'true'
-    - run: cargo binstall timelord-cli@3.0.1
+    - name: Set defaults
       shell: bash
-      if: steps.cache-timelord-bin.outputs.cache-hit != 'true'
+      run: |
+        echo "TIMELORD_KEY=${{ inputs.key || format('timelord-v1-{0}-{1}', github.repository, hashFiles('**/*.rs', '**/Cargo.toml', '**/Cargo.lock')) }}" >> $GITHUB_ENV
+        echo "TIMELORD_PATH=${{ inputs.path || '.' }}" >> $GITHUB_ENV
+        echo "TIMELORD_CACHE_PATH=$HOME/.cache/timelord" >> $GITHUB_ENV
 
-    - name: Load timelord files
-      uses: actions/cache/restore@v3
+    - name: Restore binary cache
+      id: binary-cache
+      uses: actions/cache/restore@v4
       with:
-        path: /timelord/
-        key: ${{ inputs.key }}
-    - name: Run timelord to set timestamps
+        path: /usr/share/rust/.cargo/bin
+        key: timelord-binaries-v1
+
+    - name: Check if binaries need installation
       shell: bash
-      run: timelord sync --source-dir ${{ inputs.path }} --cache-dir /timelord/
-    - name: Save timelord
-      uses: actions/cache/save@v3
+      id: check-binaries
+      run: |
+        NEED_INSTALL=false
+        if [ ! -e /usr/share/rust/.cargo/bin/timelord ]; then
+          echo "timelord-cli not found at /usr/share/rust/.cargo/bin/timelord, needs installation"
+          NEED_INSTALL=true
+        fi
+        if [ ! -e /usr/share/rust/.cargo/bin/git-warp-time ]; then
+          echo "git-warp-time not found at /usr/share/rust/.cargo/bin/git-warp-time, needs installation"
+          NEED_INSTALL=true
+        fi
+        echo "need-install=$NEED_INSTALL" >> $GITHUB_OUTPUT
+
+    - name: Install timelord-cli and git-warp-time
+      if: steps.check-binaries.outputs.need-install == 'true'
+      uses: https://github.com/taiki-e/install-action@v2
       with:
-        path: /timelord/
-        key: ${{ inputs.key }}
+        tool: git-warp-time,timelord-cli@3.0.1
+
+    - name: Save binary cache
+      if: steps.check-binaries.outputs.need-install == 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: /usr/share/rust/.cargo/bin
+        key: timelord-binaries-v1
+
+
+    - name: Restore timelord cache with fallbacks
+      id: timelord-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: ${{ env.TIMELORD_CACHE_PATH }}
+        key: ${{ env.TIMELORD_KEY }}
+        restore-keys: |
+          timelord-v1-${{ github.repository }}-
+
+    - name: Initialize timestamps on complete cache miss
+      if: steps.timelord-restore.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        echo "Complete timelord cache miss - running git-warp-time"
+        git fetch --unshallow
+        if [ "${{ env.TIMELORD_PATH }}" = "." ]; then
+          /usr/share/rust/.cargo/bin/git-warp-time --quiet
+        else
+          /usr/share/rust/.cargo/bin/git-warp-time --quiet ${{ env.TIMELORD_PATH }}
+        fi
+        echo "Git timestamps restored"
+
+    - name: Run timelord sync
+      shell: bash
+      run: |
+        mkdir -p ${{ env.TIMELORD_CACHE_PATH }}
+        /usr/share/rust/.cargo/bin/timelord sync --source-dir ${{ env.TIMELORD_PATH }} --cache-dir ${{ env.TIMELORD_CACHE_PATH }}
+
+    - name: Save updated timelord cache immediately
+      uses: actions/cache/save@v4
+      with:
+        path: ${{ env.TIMELORD_CACHE_PATH }}
+        key: ${{ env.TIMELORD_KEY }}

.forgejo/workflows/release-image.yml

@@ -150,10 +150,18 @@ jobs:
           echo "Commit timestamp: $timestamp"
 
       - uses: ./.forgejo/actions/timelord
-        if: ${{ env.BUILDKIT_ENDPOINT == '' }}
-        with:
-          key: timelord-v0
-          path: .
+        id: timelord
+
+      - name: Copy timelord cache to workspace
+        shell: bash
+        run: |
+          mkdir -p ./timelord
+          if [ -d "${{ steps.timelord.outputs.database-path }}" ]; then
+            cp -r "${{ steps.timelord.outputs.database-path }}"/* ./timelord/
+            echo "Copied timelord cache to workspace"
+          else
+            echo "No timelord cache to copy"
+          fi
 
       - name: Cache Rust registry
         if: ${{ env.BUILDKIT_ENDPOINT == '' }}
@@ -217,6 +225,7 @@ jobs:
             GIT_COMMIT_HASH_SHORT=${{ env.COMMIT_SHORT_SHA }}
             GIT_REMOTE_URL=${{github.event.repository.html_url }}
             GIT_REMOTE_COMMIT_URL=${{github.event.head_commit.url }}
+            CARGO_INCREMENTAL=${{ env.BUILDKIT_ENDPOINT != '' && '1' || '0' }}
           platforms: ${{ matrix.platform }}
           labels: ${{ steps.meta.outputs.labels }}
           annotations: ${{ steps.meta.outputs.annotations }}

docker/Dockerfile

@@ -60,6 +60,7 @@ RUN <<EOF
     curl --retry 5 -L --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/cargo-bins/cargo-binstall/main/install-from-binstall-release.sh | bash
     cargo binstall --no-confirm cargo-sbom --version $CARGO_SBOM_VERSION
     cargo binstall --no-confirm lddtree --version $LDDTREE_VERSION
+    cargo binstall --no-confirm timelord-cli@3.0.1
 EOF
 
 # Set up xx (cross-compilation scripts)
@@ -81,8 +82,9 @@ RUN rustc --version \
     && xx-cargo --setup-target-triple
 
 # Build binary
-# We disable incremental compilation to save disk space, as it only produces a minimal speedup for this case.
-RUN echo "CARGO_INCREMENTAL=0" >> /etc/environment
+# Configure incremental compilation based on build context
+ARG CARGO_INCREMENTAL=0
+RUN echo "CARGO_INCREMENTAL=${CARGO_INCREMENTAL}" >> /etc/environment
 
 # Configure pkg-config
 RUN <<EOF
@@ -133,6 +135,14 @@ FROM toolchain AS builder
 # Get source
 COPY . .
 
+# Restore timestamps from timelord cache if available
+RUN if [ -f /app/timelord/timelord.db ]; then \
+        echo "Restoring timestamps from timelord cache"; \
+        timelord sync --source-dir /app --cache-dir /app/timelord; \
+    else \
+        echo "No timelord cache found, timestamps will be build time"; \
+    fi
+
 ARG TARGETPLATFORM
 
 # Verify environment configuration