build: try to cache source tarballs

.docker/build-linux.sh

@@ -44,12 +44,7 @@ cd "$HOME"
 rm -rf dwarfs dwarfs-*
 
 if [[ "$BUILD_FROM_TARBALL" == "1" ]]; then
-  # delete all but the latest tarball
-  ls -1 -r --sort=time /workspace/dwarfs-*.tar.zst | tail -n +2 | while read -r tarball; do
-    echo "deleting old tarball: $tarball"
-    rm -f "$tarball"
-  done
-  tar xf /workspace/dwarfs-*.tar.zst
+  tar xf "/artifacts/cache/dwarfs-source-${GITHUB_RUN_NUMBER}.tar.zst"
   ln -s dwarfs-* dwarfs
 else
   git config --global --add safe.directory /workspace
@@ -309,10 +304,6 @@ else
   elif [[ "-$BUILD_TYPE-" == *-source-* ]]; then
     $BUILD_TOOL package_source
     $BUILD_TOOL copy_source_artifacts
-    rm -rf /tmp-runner/artifacts
-    mkdir -p /tmp-runner/artifacts
-    cp source-artifacts.env /tmp-runner
-    cp dwarfs-*.tar.zst /tmp-runner/artifacts
   fi
 
   if [[ "-$BUILD_TYPE-" != *-[at]san-* ]] && \

.github/workflows/build.yml

@@ -136,17 +136,6 @@ jobs:
             --env GITHUB_RUN_ATTEMPT \
             dwarfs-linux-build-arch
 
-      - name: Prepare Artifact Upload
-        run: cat ${{ runner.temp }}/source-artifacts.env >> $GITHUB_ENV
-
-      - name: Upload Source Package
-        uses: actions/upload-artifact@v4
-        with:
-          name: dwarfs-source
-          path: ${{ runner.temp }}/artifacts/${{ env.source_tarball }}
-          if-no-files-found: error
-          compression-level: 0
-
   linux-src:
     needs: package-source
 
@@ -213,11 +202,6 @@ jobs:
           fetch-depth: '0'
           ref: ${{ github.ref }}
 
-      - name: Download Source Tarball
-        uses: actions/download-artifact@v4
-        with:
-          name: dwarfs-source
-
       - name: Build Docker Image
         run: |
           docker build \
@@ -235,6 +219,7 @@ jobs:
             --mount type=bind,source=${{ runner.temp }},target=/tmp-runner \
             --mount type=bind,source=/home/mhx/github-ccache,target=/ccache \
             --mount type=bind,source=/home/mhx/github-local,target=/local \
+            --mount type=bind,source=/mnt/opensource/artifacts/dwarfs,target=/artifacts \
             --env BUILD_FROM_TARBALL=1 \
             --env BUILD_TYPE=${{ matrix.build_type }} \
             --env BUILD_ARCH=${{ matrix.arch }} \

CMakeLists.txt

@@ -855,12 +855,14 @@ if(DEFINED ENV{GITHUB_REF_TYPE})
     set(PACKAGE_EXT ".tar.zst")
   endif()
 
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/source-artifacts.env"
-             "source_tarball=${CMAKE_PROJECT_NAME}-${PRJ_VERSION_FULL}${PACKAGE_EXT}\n")
+  set(SOURCE_TARBALL "${CMAKE_PROJECT_NAME}-${PRJ_VERSION_FULL}${PACKAGE_EXT}")
 
   add_custom_target(copy_source_artifacts
     COMMAND ${CMAKE_COMMAND} -E make_directory ${ARTIFACTS_FULL_PATH}
-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_PROJECT_NAME}-${PRJ_VERSION_FULL}${PACKAGE_EXT} ${ARTIFACTS_FULL_PATH}
+    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${SOURCE_TARBALL} ${ARTIFACTS_FULL_PATH}
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${DWARFS_ARTIFACTS_DIR}/cache
+    COMMAND ${CMAKE_COMMAND} -E create_symlink ../${ARTIFACTS_SUBDIR}/${SOURCE_TARBALL}
+                ${DWARFS_ARTIFACTS_DIR}/cache/dwarfs-source-$ENV{GITHUB_RUN_NUMBER}${PACKAGE_EXT}
   )
 
   if(STATIC_BUILD_DO_NOT_USE OR WIN32)