auto updates

Add support to auto-update containers running in systemd units as
generated with `podman generate systemd --new`.

`podman auto-update` looks up containers with a specified
"io.containers.autoupdate" label (i.e., the auto-update policy).

If the label is present and set to "image", Podman reaches out to the
corresponding registry to check if the image has been updated.  We
consider an image to be updated if the digest in the local storage is
different than the one of the remote image.  If an image must be
updated, Podman pulls it down and restarts the container.  Note that the
restarting sequence relies on systemd.

At container-creation time, Podman looks up the "PODMAN_SYSTEMD_UNIT"
environment variables and stores it verbatim in the container's label.
This variable is now set by all systemd units generated by
`podman-generate-systemd` and is set to `%n` (i.e., the name of systemd
unit starting the container).  This data is then being used in the
auto-update sequence to instruct systemd (via DBUS) to restart the unit
and hence to restart the container.

Note that this implementation of auto-updates relies on systemd and
requires a fully-qualified image reference to be used to create the
container.  This enforcement is necessary to know which image to
actually check and pull.  If we used an image ID, we would not know
which image to check/pull anymore.

Fixes: #3575
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/hack/podman-commands.sh b/hack/podman-commands.sh
index 32f94fc7b..da4d446aa 100755
--- a/hack/podman-commands.sh
+++ b/hack/podman-commands.sh
@@ -38,6 +38,9 @@ function podman_man() {
 
         # Special case: there is no podman-help man page, nor need for such.
         echo "help"
+        # Auto-update differs from other commands as it's a single command, not
+        # a main and sub-command split by a dash.
+        echo "auto-update"
     elif [ "$@" = "podman-image-trust" ]; then
         # Special case: set and show aren't actually in a table in the man page
         echo set