Check downloaded archive with GPG.

Dockerfile

@@ -6,6 +6,7 @@ ADD         nginx_ssl.conf /root/
 ADD         nginx.conf /root/
 
 ENV         DEBIAN_FRONTEND noninteractive
+ENV         OWNCLOUD_VERSION 8.0.3
 RUN         dpkg-divert --local --rename --add /sbin/initctl && ln -sf /bin/true /sbin/initctl
 
 RUN         export LANG=C.UTF-8 ;\
@@ -15,7 +16,15 @@ RUN         export LANG=C.UTF-8 ;\
 RUN         apt-get update && \
             apt-get install -y php5-cli php5-gd php5-pgsql php5-sqlite php5-mysqlnd php5-curl php5-intl php5-mcrypt php5-ldap php5-gmp php5-apcu php5-imagick php5-fpm smbclient nginx wget
 
-ADD         https://download.owncloud.org/community/owncloud-8.0.3.tar.bz2 /tmp/oc.tar.bz2
+RUN         mkdir /tmp/gpg && \
+            chmod 700 /tmp/gpg
+## https://owncloud.org/owncloud.asc
+ADD         owncloud.asc /tmp/gpg/owncloud.asc
+ADD         https://download.owncloud.org/community/owncloud-$OWNCLOUD_VERSION.tar.bz2 /tmp/oc.tar.bz2
+ADD         https://download.owncloud.org/community/owncloud-$OWNCLOUD_VERSION.tar.bz2.asc /tmp/oc.tar.bz2.asc
+RUN         gpg --homedir /tmp/gpg --import /tmp/gpg/owncloud.asc && \
+            gpg --homedir /tmp/gpg --verify /tmp/oc.tar.bz2.asc && \
+            rm -r /tmp/oc.tar.bz2.asc /tmp/gpg
 RUN         mkdir -p /var/www/owncloud /owncloud /var/log/cron && \
             tar -C /var/www/ -xf /tmp/oc.tar.bz2 && \
             chown -R www-data:www-data /var/www/owncloud && \

Makefile

@@ -0,0 +1,8 @@
+.PHONY: verify-gpg-public-keys
+verify-gpg-public-keys: owncloud.asc
+
+## Always renew
+.PHONY: owncloud.asc
+owncloud.asc:
+	wget --output-document "$@" "https://owncloud.org/$@"
+	git diff --exit-code -- owncloud.asc && echo 'OK' || echo 'Not OK'

owncloud.asc

@@ -0,0 +1,52 @@
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+Version: GnuPG v2.0.19 (GNU/Linux)
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+=sX8A
+-----END PGP PUBLIC KEY BLOCK-----