ci_template: Use a host-mapped volume for the ccache directory

Use hardcoded path for the cache, so it will be shared by
all jobs of all gstreamer projects running on the same runner host. This
should increase the hit rate and decrease the worst case storage used.

Adaptation of https://gitlab.freedesktop.org/mesa/mesa/merge_requests/2818

See https://gitlab.freedesktop.org/freedesktop/freedesktop/issues/120

gitlab/ci_template.yml

@@ -95,12 +95,17 @@ gst indent:
   dependencies:
     - "manifest"
   variables:
-    CCACHE_BASEDIR: "${CI_PROJECT_DIR}"
-    CCACHE_DIR: "${CI_PROJECT_DIR}/ccache"
+    CCACHE_COMPILERCHECK: "content"
+    CCACHE_COMPRESS: "true"
+    CCACHE_BASEDIR: "/cache/gstreamer/gst-build"
+    CCACHE_DIR: "/cache/gstreamer/gst-build/ccache/"
+    # shared across everything really
+    CCACHE_MAXSIZE: "10G"
+
     MESON_ARGS: "${DEFAULT_MESON_ARGS} ${MESON_BUILDTYPE_ARGS} --werror"
 
   script:
-    - ccache -z
+    - ccache --show-stats
     - curl -o clone_manifest_ref.py https://gitlab.freedesktop.org/gstreamer/gst-ci/raw/${GST_UPSTREAM_BRANCH}/gitlab/clone_manifest_ref.py
     - chmod +x clone_manifest_ref.py
     - ./clone_manifest_ref.py --manifest manifest.xml --project gst-build --destination gst-build
@@ -110,7 +115,7 @@ gst indent:
     - ./git-update --no-interaction --manifest="${CI_PROJECT_DIR}/manifest.xml"
     - meson build/ $MESON_ARGS
     - ninja -C build/
-    - ccache -s
+    - ccache --show-stats
   after_script:
     - cd gst-build/
     # Clean the artifacts packages to avoid copying "useless" build products.
@@ -118,10 +123,6 @@ gst indent:
     # Clean the .git repos since we won't need them anymore
     - rm -rf subprojects/*/.git/
     - rm -rf build/subprojects/*/.git/
-  cache:
-    key: "${CI_JOB_NAME}"
-    paths:
-      - "${CCACHE_DIR}"
   except:
     variables:
       - $CI_PROJECT_NAME == "cerbero"
@@ -337,9 +338,13 @@ valgrind ges:
   dependencies:
     - "manifest"
   variables:
-    CCACHE_BASEDIR: "${CI_PROJECT_DIR}"
-    CCACHE_DIR: "${CI_PROJECT_DIR}/ccache"
-    CCACHE_MAXSIZE: "1.7G"
+    CCACHE_COMPILERCHECK: "content"
+    CCACHE_COMPRESS: "true"
+    CCACHE_BASEDIR: "/cache/gstreamer/cerbero/"
+    CCACHE_DIR: "/cache/gstreamer/cerbero/ccache/"
+    # shared across everything really
+    CCACHE_MAXSIZE: "50G"
+
     CERBERO_HOME: "cerbero-build"
     CERBERO_SOURCES: "cerbero-sources"
     CERBERO_DEPS: "cerbero-deps.tar.gz"
@@ -365,7 +370,7 @@ valgrind ges:
     - echo "local_sources = \"$(pwd)/${CERBERO_SOURCES}\"" >> localconf.cbc
     - ./cerbero-uninstalled --self-update manifest.xml
   script:
-    - test "x${HAVE_CCACHE}" = "xyes" && ccache -z
+    - test "x${HAVE_CCACHE}" = "xyes" && ccache --show-stats
     - $CERBERO $CERBERO_ARGS show-config
     - $CERBERO $CERBERO_ARGS fetch-bootstrap --build-tools-only
     - $CERBERO $CERBERO_ARGS fetch-package --deps gstreamer-1.0
@@ -385,7 +390,6 @@ valgrind ges:
   cache:
     key: "${CI_JOB_NAME}"
     paths:
-      - "${CCACHE_DIR}"
       - "${CERBERO_SOURCES}"
   artifacts:
     name: "${CI_JOB_NAME}_${CI_COMMIT_SHA}"