[pkg-go] Bug#978650: podman: please provide a default container registry for looking up short image names

[Antonio Terceiro]

Package: podman
Version: 2.1.1+dfsg1-3
Severity: wishlist

When running stuff that was originally written for docker, image names
will usually be provided in their short form, i.e. debian:10,
fedora:rawhide. In the current state of the Debian packaging, those will
fail like this:

$ cat Containerfile
FROM debian
$ podman build -t foobar .
STEP 1: FROM debian
Error: error creating build container: (image name "debian" is a short name and no search registries are defined in /etc/containers/registries.conf): while pulling "debian" as "localhost/debian": Error initializing source docker://localhost/debian:latest: error pinging docker registry localhost: Get "https://localhost/v2/": dial tcp [::1]:443: connect: connection refused

On Fedora, on the other hand, this just works, because their
registries.conf provides by default a list of as few registries
registries where to look up unqualified image names:

[terceiro at fedora tmp]$ grep -v '^#' /etc/containers/registries.conf
unqualified-search-registries = ['registry.fedoraproject.org', 'registry.access.redhat.com', 'registry.centos.org', 'docker.io']

I don't think we want to include the fedora/redhat/centos registries,
but we should include at least the docker.io registry, which is the _de
facto_ standard in the container world at the moment. So can we please
provide something like the line below by default in
/etc/containers/registries.conf?

unqualified-search-registries = ['docker.io']

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'unstable'), (500, 'testing'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.9.0-5-amd64 (SMP w/4 CPU threads)
Locale: LANG=pt_BR.UTF-8, LC_CTYPE=pt_BR.UTF-8 (charmap=UTF-8), LANGUAGE=pt_BR:pt:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages podman depends on:
ii  conmon                           2.0.20-1
ii  containernetworking-plugins      0.8.7-1
ii  crun                             0.15.1+dfsg-1
ii  golang-github-containers-common  0.26.3+ds1-2
ii  init-system-helpers              1.60
ii  libc6                            2.31-6
ii  libdevmapper1.02.1               2:1.02.173-1
ii  libgpgme11                       1.14.0-1+b2
ii  libseccomp2                      2.5.1-1
ii  runc                             1.0.0~rc92+dfsg1-5

Versions of packages podman recommends:
ii  buildah         1.16.6+dfsg1-2
ii  catatonit       0.1.5-2
ii  fuse-overlayfs  1.2.0-1
ii  slirp4netns     1.0.1-1
ii  tini            0.19.0-1
ii  uidmap          1:4.8.1-1

Versions of packages podman suggests:
pn  containers-storage  <none>

-- no debconf information
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