tests/docker: use explicit docker.io registry

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>

7 files changed, 7 insertions, 7 deletions

diff --git a/tests/docker/dockerfiles/centos8.docker b/tests/docker/dockerfiles/centos8.docker
index 03e0440..8f81081 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 ba41482..2f11b3b 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 4ffe476..a27b88d 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 5adfd62..febf884 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 100cfa7..e0ff425 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 86114be..adcdef8 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 b33ed13..78755bc 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 \