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, 2 insertions, 1 deletions

diff --git a/pkg/spec/createconfig.go b/pkg/spec/createconfig.go
index 9b2255d61..12dfed8c3 100644
--- a/pkg/spec/createconfig.go
+++ b/pkg/spec/createconfig.go
@@ -144,6 +144,7 @@ type CreateConfig struct {
 	InitPath          string //init-path
 	Image             string
 	ImageID           string
+	RawImageName      string
 	BuiltinImgVolumes map[string]struct{} // volumes defined in the image config
 	ImageVolumeType   string              // how to handle the image volume, either bind, tmpfs, or ignore
 	Interactive       bool                //interactive
@@ -348,7 +349,7 @@ func (c *CreateConfig) getContainerCreateOptions(runtime *libpod.Runtime, pod *l
 	options = append(options, nsOpts...)
 
 	// Gather up the options for NewContainer which consist of With... funcs
-	options = append(options, libpod.WithRootFSFromImage(c.ImageID, c.Image))
+	options = append(options, libpod.WithRootFSFromImage(c.ImageID, c.Image, c.RawImageName))
 	options = append(options, libpod.WithConmonPidFile(c.ConmonPidFile))
 	options = append(options, libpod.WithLabels(c.Labels))
 	options = append(options, libpod.WithShmSize(c.Resources.ShmSize))