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authorValentin Rothberg <rothberg@redhat.com>2020-03-10 08:32:19 +0100
committerValentin Rothberg <rothberg@redhat.com>2020-03-17 17:18:56 +0100
commitf4e873c4e10502dd0a7fb14cc2fd87b12760a318 (patch)
tree13f9cb9c6ec95ef9522f0b8ee7cf590d2ed4ec7c /hack
parenta255d7986a1e6795d448979f7662464be4558324 (diff)
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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>
Diffstat (limited to 'hack')
-rwxr-xr-xhack/man-page-checker12
-rwxr-xr-xhack/podman-commands.sh3
2 files changed, 15 insertions, 0 deletions
diff --git a/hack/man-page-checker b/hack/man-page-checker
index 99d280539..528ff800a 100755
--- a/hack/man-page-checker
+++ b/hack/man-page-checker
@@ -49,6 +49,12 @@ for md in $(ls -1 *-*.1.md | grep -v remote);do
# podman.1.md has a two-column table; podman-*.1.md all have three.
parent=$(echo $md | sed -e 's/^\(.*\)-.*$/\1.1.md/')
+ if [[ $parent =~ "podman-auto" ]]; then
+ # podman-auto-update.1.md is special cased as it's structure differs
+ # from that of other man pages where main and sub-commands split by
+ # dashes.
+ parent="podman.1.md"
+ fi
x=3
if expr -- "$parent" : ".*-" >/dev/null; then
x=4
@@ -90,6 +96,12 @@ for md in *.1.md;do
# Get the command name, and confirm that it matches the md file name.
cmd=$(echo "$synopsis" | sed -e 's/\(.*\)\*\*.*/\1/' | tr -d \*)
md_nodash=$(basename "$md" .1.md | tr '-' ' ')
+ if [[ $md_nodash = 'podman auto update' ]]; then
+ # podman-auto-update.1.md is special cased as it's structure differs
+ # from that of other man pages where main and sub-commands split by
+ # dashes.
+ md_nodash='podman auto-update'
+ fi
if [ "$cmd" != "$md_nodash" -a "$cmd" != "podman-remote" ]; then
echo
printf "Inconsistent program name in SYNOPSIS in %s:\n" $md
diff --git a/hack/podman-commands.sh b/hack/podman-commands.sh
index 32f94fc7b..da4d446aa 100755
--- a/hack/podman-commands.sh
+++ b/hack/podman-commands.sh
@@ -38,6 +38,9 @@ function podman_man() {
# Special case: there is no podman-help man page, nor need for such.
echo "help"
+ # Auto-update differs from other commands as it's a single command, not
+ # a main and sub-command split by a dash.
+ echo "auto-update"
elif [ "$@" = "podman-image-trust" ]; then
# Special case: set and show aren't actually in a table in the man page
echo set