[PULL 12/40] tests/docker: use explicit docker.io registry

["Alex Bennée" <alex.bennee@linaro.org>]

From: Daniel P. Berrangé <berrange@redhat.com>

It is good practice to use an explicit registry for referencing the base
image. This is because some distros will inject their own registries
into the search path. For example registry.fedoraproject.org comes ahead
of docker.io. Using an explicit registry avoids wasting time querying
multiple registries for images that they won't have.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210623142245.307776-5-berrange@redhat.com>
Message-Id: <20210709143005.1554-13-alex.bennee@linaro.org>

diff --git a/tests/docker/dockerfiles/centos8.docker b/tests/docker/dockerfiles/centos8.docker
index 03e0440e03..8f810810f3 100644
--- a/tests/docker/dockerfiles/centos8.docker
+++ b/tests/docker/dockerfiles/centos8.docker
@@ -1,4 +1,4 @@
-FROM centos:8.3.2011
+FROM docker.io/centos:8
 
 RUN dnf -y update
 ENV PACKAGES \
diff --git a/tests/docker/dockerfiles/debian-xtensa-cross.docker b/tests/docker/dockerfiles/debian-xtensa-cross.docker
index ba4148299c..2f11b3b7bc 100644
--- a/tests/docker/dockerfiles/debian-xtensa-cross.docker
+++ b/tests/docker/dockerfiles/debian-xtensa-cross.docker
@@ -5,7 +5,7 @@
 # using a prebuilt toolchains for Xtensa cores from:
 # https://github.com/foss-xtensa/toolchain/releases
 #
-FROM debian:stretch-slim
+FROM docker.io/library/debian:stretch-slim
 
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata && \
diff --git a/tests/docker/dockerfiles/debian10.docker b/tests/docker/dockerfiles/debian10.docker
index 4ffe47671e..a27b88df55 100644
--- a/tests/docker/dockerfiles/debian10.docker
+++ b/tests/docker/dockerfiles/debian10.docker
@@ -7,7 +7,7 @@
 # On its own you can't build much but the docker-foo-cross targets
 # build on top of the base debian image.
 #
-FROM debian:buster-slim
+FROM docker.io/library/debian:buster-slim
 
 # Duplicate deb line as deb-src
 RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
diff --git a/tests/docker/dockerfiles/debian11.docker b/tests/docker/dockerfiles/debian11.docker
index 5adfd62d55..febf884f8f 100644
--- a/tests/docker/dockerfiles/debian11.docker
+++ b/tests/docker/dockerfiles/debian11.docker
@@ -8,7 +8,7 @@
 # On its own you can't build much but the docker-foo-cross targets
 # build on top of the base debian image.
 #
-FROM debian:bullseye-slim
+FROM docker.io/library/debian:bullseye-slim
 
 # Duplicate deb line as deb-src
 RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
diff --git a/tests/docker/dockerfiles/ubuntu.docker b/tests/docker/dockerfiles/ubuntu.docker
index 100cfa76e3..e0ff425c01 100644
--- a/tests/docker/dockerfiles/ubuntu.docker
+++ b/tests/docker/dockerfiles/ubuntu.docker
@@ -9,7 +9,7 @@
 # system won't pick up that it has changed.
 #
 
-FROM ubuntu:20.04
+FROM docker.io/library/ubuntu:20.04
 ENV PACKAGES \
     ccache \
     clang \
diff --git a/tests/docker/dockerfiles/ubuntu1804.docker b/tests/docker/dockerfiles/ubuntu1804.docker
index 86114be23a..adcdef8244 100644
--- a/tests/docker/dockerfiles/ubuntu1804.docker
+++ b/tests/docker/dockerfiles/ubuntu1804.docker
@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM docker.io/library/ubuntu:18.04
 ENV PACKAGES \
     ccache \
     clang \
diff --git a/tests/docker/dockerfiles/ubuntu2004.docker b/tests/docker/dockerfiles/ubuntu2004.docker
index b33ed139d9..78755bc2e3 100644
--- a/tests/docker/dockerfiles/ubuntu2004.docker
+++ b/tests/docker/dockerfiles/ubuntu2004.docker
@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM docker.io/library/ubuntu:20.04
 ENV PACKAGES flex bison \
     bsdmainutils \
     ccache \
-- 
2.20.1