[PATCH v8 09/15] sbuild: Add ccache support

[Uladzimir Bely <ubely@ilbers.de>]

This adds ccache support for custom packages in the same manner
as it was done previously for buildchroot-based build, by using
USE_CCACHE variable in local.conf or per-recipe.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 meta/classes/dpkg.bbclass                     |  4 ++++
 meta/classes/sbuild.bbclass                   | 23 +++++++++++++++++++
 .../sbuild-chroot/sbuild-chroot.inc           |  1 +
 3 files changed, 28 insertions(+)

diff --git a/meta/classes/dpkg.bbclass b/meta/classes/dpkg.bbclass
index b3931850..2392d894 100644
--- a/meta/classes/dpkg.bbclass
+++ b/meta/classes/dpkg.bbclass
@@ -48,6 +48,10 @@ dpkg_runbuild() {
     deb_dir="/var/cache/apt/archives/"
     ext_deb_dir="/home/builder/${PN}/rootfs/${deb_dir}"
 
+    if [ ${USE_CCACHE} -eq 1 ]; then
+        schroot_configure_ccache
+    fi
+
     profiles="${@ isar_deb_build_profiles(d)}"
     if [ ! -z "$profiles" ]; then
         profiles=$(echo --profiles="$profiles" | sed -e 's/ \+/,/g')
diff --git a/meta/classes/sbuild.bbclass b/meta/classes/sbuild.bbclass
index cfd0acd5..63820793 100644
--- a/meta/classes/sbuild.bbclass
+++ b/meta/classes/sbuild.bbclass
@@ -157,3 +157,26 @@ schroot_run() {
     remove_mounts
     schroot_delete_configs
 }
+
+schroot_configure_ccache() {
+    sudo -s <<'EOSUDO'
+        set -e
+
+        sbuild_fstab="${SBUILD_CONF_DIR}/fstab"
+
+        install --group=sbuild --mode=2775 -d ${CCACHE_DIR}
+        fstab_ccachedir="${CCACHE_DIR} /ccache none rw,bind 0 0"
+        grep -qxF "${fstab_ccachedir}" ${sbuild_fstab} || echo "${fstab_ccachedir}" >> ${sbuild_fstab}
+
+        (flock 9
+        [ -w ${CCACHE_DIR}/sbuild-setup ] || cat << END > ${CCACHE_DIR}/sbuild-setup
+#!/bin/sh
+export PATH="\$PATH_PREPEND:\$PATH"
+exec "\$@"
+END
+        chmod a+rx ${CCACHE_DIR}/sbuild-setup
+        ) 9>"${CCACHE_DIR}/sbuild-setup.lock"
+
+        echo "command-prefix=/ccache/sbuild-setup" >> "${SCHROOT_CONF_FILE}"
+EOSUDO
+}
diff --git a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc
index 177a8a6d..74811e22 100644
--- a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc
+++ b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc
@@ -14,6 +14,7 @@ SBUILD_CHROOT_PREINSTALL_COMMON = " \
     fakeroot \
     build-essential \
     debhelper \
+    ccache \
 "
 
 SBUILD_CHROOT_PREINSTALL ?= " \
-- 
2.20.1