[RFC 06/12] rootfs: rework sstate caching of rootfs artifact

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

We ensure that the sstate artifact is always generated for the correct
rootfs directory by using the ROOTFSDIR variable instead of the
assumption that it is in "rootfs". Further, we avoid file permission
cleanup by using stdout to pass the artifact from the privileged space
to the caller.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta/classes-recipe/rootfs.bbclass | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/meta/classes-recipe/rootfs.bbclass b/meta/classes-recipe/rootfs.bbclass
index b64a5bde..c9b0a6d1 100644
--- a/meta/classes-recipe/rootfs.bbclass
+++ b/meta/classes-recipe/rootfs.bbclass
@@ -663,11 +663,12 @@ rootfs_install_sstate_prepare() {
     # tar --one-file-system will cross bind-mounts to the same filesystem,
     # so we use some mount magic to prevent that
     mkdir -p ${WORKDIR}/mnt/rootfs
-    run_privileged mount -o bind,private '${WORKDIR}/rootfs' '${WORKDIR}/mnt/rootfs' -o ro
-    lopts="--one-file-system --exclude=var/cache/apt/archives"
-    run_privileged tar -C ${WORKDIR}/mnt -cpSf rootfs.tar $lopts ${SSTATE_TAR_ATTR_FLAGS} rootfs
-    run_privileged umount ${WORKDIR}/mnt/rootfs
-    run_privileged chown $(id -u):$(id -g) rootfs.tar
+    run_privileged_here <<'EOF' 3> rootfs.tar
+        mount -o bind,private '${ROOTFSDIR}' '${WORKDIR}/mnt/rootfs' -o ro
+        lopts="--one-file-system --exclude=var/cache/apt/archives"
+        tar -C ${WORKDIR}/mnt/rootfs -cpS $lopts ${SSTATE_TAR_ATTR_FLAGS} . >&3
+        umount -q ${WORKDIR}/mnt/rootfs
+EOF
 }
 do_rootfs_install_sstate_prepare[lockfiles] = "${REPO_ISAR_DIR}/isar.lock"
 
@@ -676,7 +677,8 @@ rootfs_install_sstate_finalize() {
     # - after building the rootfs, the tar won't be there, but we also don't need to unpack
     # - after restoring from cache, there will be a tar which we unpack and then delete
     if [ -f rootfs.tar ]; then
-        run_privileged tar -C ${WORKDIR} -xpf rootfs.tar ${SSTATE_TAR_ATTR_FLAGS}
+        mkdir -p ${ROOTFSDIR}
+        run_privileged tar -C ${ROOTFSDIR} -xp ${SSTATE_TAR_ATTR_FLAGS} < rootfs.tar
         rm rootfs.tar
     fi
 }
-- 
2.51.0

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