Put the list of package names in an environment, and output their
package names to the target file in the end.

Signed-off-by: Fam Zheng <f...@redhat.com>
Message-Id: <1474429768-25027-2-git-send-email-f...@redhat.com>
Reviewed-by: Daniel P. Berrange <berra...@redhat.com>
 tests/docker/dockerfiles/centos6.docker | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/docker/dockerfiles/centos6.docker 
index 8f4fe46..34e0d3b 100644
--- a/tests/docker/dockerfiles/centos6.docker
+++ b/tests/docker/dockerfiles/centos6.docker
@@ -1,6 +1,8 @@
 FROM centos:6
-RUN yum install -y \
+RUN yum install -y epel-release
+ENV PACKAGES libfdt-devel ccache \
     tar git make gcc g++ \
     zlib-devel glib2-devel SDL-devel pixman-devel \
-RUN yum install -y libfdt-devel ccache
+RUN yum install -y $PACKAGES
+RUN rpm -q $PACKAGES | sort > /packages.txt

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