[Qemu-devel] [PATCH RFC v4 3/4] docker: Support "QEMU_CHROOT" in dockerfiles

[Fam Zheng <famz@redhat.com>]

This allows a docker file to say "ENV QEMU_CHROOT /path/to/new/root" to
indicate that the test execution should be done in a chroot in the
container.

Bind mount dev,sys,proc into QEMU_CHROOT to make them avaiable for
testing scripts.

The SYS_ADMIN is a required capability for mount, add it to the
docker run command line.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 tests/docker/Makefile.include |  1 +
 tests/docker/run              | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index c5546ee..e9821ba 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -107,6 +107,7 @@ docker-run-%: docker-qemu-src
 		$(call quiet-command,\
 			$(SRC_PATH)/tests/docker/docker.py run $(if $V,,--rm) \
 				-t \
+				--cap-add SYS_ADMIN \
 				$(if $(DEBUG),-i,--net=none) \
 				-e TARGET_LIST=$(TARGET_LIST) \
 				-e EXTRA_CONFIGURE_OPTS=$(EXTRA_CONFIGURE_OPTS) \
diff --git a/tests/docker/run b/tests/docker/run
index 38ce789..4e80cc3 100755
--- a/tests/docker/run
+++ b/tests/docker/run
@@ -19,6 +19,18 @@ fi
 
 BASE="$(dirname $(realpath $0))"
 
+# cp files into the chroot and execute there
+if test -n "$QEMU_CHROOT"; then
+    mkdir -p $QEMU_CHROOT/$BASE
+    cp $BASE/* $QEMU_CHROOT/$BASE
+    QEMU_CHROOT_SAVE="$QEMU_CHROOT"
+    for bp in dev sys proc; do
+        mount --bind /$bp $QEMU_CHROOT/$bp
+    done
+    QEMU_CHROOT="" chroot $QEMU_CHROOT_SAVE $BASE/run "$@"
+    exit 0
+fi
+
 # Prepare the environment
 . /etc/profile || true
 export PATH=/usr/lib/ccache:$PATH
-- 
2.7.4