[PATCH v4 07/12] 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                   | 22 +++++++++++++++++++
 .../sbuild-chroot/sbuild-chroot.inc           |  1 +
 3 files changed, 27 insertions(+)

diff --git a/meta/classes/dpkg.bbclass b/meta/classes/dpkg.bbclass
index 8647d077..e761078d 100644
--- a/meta/classes/dpkg.bbclass
+++ b/meta/classes/dpkg.bbclass
@@ -38,6 +38,10 @@ dpkg_runbuild() {
 
     schroot_create_configs
 
+    if [ ${USE_CCACHE} -eq 1 ]; then
+        schroot_configure_ccache
+    fi
+
     profiles=$(grep "DEB_BUILD_PROFILES" ${SBUILD_CONFIG} | tail -n1 | cut -d "'" -f 4)
     if [ ${ISAR_CROSS_COMPILE} -eq 1 ]; then
         profiles="${profiles} cross nocheck"
diff --git a/meta/classes/sbuild.bbclass b/meta/classes/sbuild.bbclass
index e4341a6f..c9676bdf 100644
--- a/meta/classes/sbuild.bbclass
+++ b/meta/classes/sbuild.bbclass
@@ -158,3 +158,25 @@ 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}
+
+        cat << END > ${CCACHE_DIR}/sbuild-setup
+#!/bin/sh
+export CCACHE_DIR=/ccache
+export PATH="/usr/lib/ccache:\$PATH"
+exec "\$@"
+END
+        chmod a+rx ${CCACHE_DIR}/sbuild-setup
+
+        echo "command-prefix=/ccache/sbuild-setup" >> "${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