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System tests: new checkpoint tests
Includes a test for the stdout-goes-away bug (crun #756). Skip on Ubuntu due to a many-months-old kernel bug that keeps getting fixed and then un-fixed. Signed-off-by: Ed Santiago <santiago@redhat.com>
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Ed Santiago
175
test/system/520-checkpoint.bats
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175
test/system/520-checkpoint.bats
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#!/usr/bin/env bats -*- bats -*-
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#
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# test podman checkpoint. Similar in many ways to our pause tests.
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#
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load helpers
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CHECKED_ROOTLESS=
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function setup() {
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# FIXME: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1857257
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# TL;DR they keep fixing it then breaking it again. There's a test we
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# could run to see if it's fixed, but it's way too complicated. Since
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# integration tests also skip checkpoint tests on Ubuntu, do the same here.
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if grep -qiw ubuntu /etc/os-release; then
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skip "FIXME: checkpointing broken in Ubuntu 2004, 2104, 2110, ..."
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fi
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# None of these tests work rootless....
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if is_rootless; then
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# ...however, is that a genuine cast-in-stone limitation, or one
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# that can some day be fixed? If one day some PR removes that
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# restriction, fail loudly here, so the developer can enable tests.
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if [[ -n "$CHECKED_ROOTLESS" ]]; then
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run_podman '?' container checkpoint -l
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is "$output" "Error: checkpointing a container requires root" \
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"Confirming that rootless checkpoint doesn't work. If that changed, please reexamine this test file!"
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CHECKED_ROOTLESS=y
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fi
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skip "checkpoint does not work rootless"
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fi
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basic_setup
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}
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function teardown() {
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run_podman '?' volume rm myvol
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basic_teardown
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}
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@test "podman checkpoint - basic test" {
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run_podman run -d $IMAGE sh -c 'while :;do cat /proc/uptime; sleep 0.1;done'
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local cid="$output"
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# Wait for container to start emitting output
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wait_for_output '[1-9]\+' $cid
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# Checkpoint, and confirm via inspect
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run_podman container checkpoint $cid
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is "$output" "$cid" "podman container checkpoint"
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run_podman container inspect \
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--format '{{.State.Status}}:{{.State.Running}}:{{.State.Paused}}:{{.State.Checkpointed}}' $cid
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is "$output" "exited:false:false:true" "State. Status:Running:Pause:Checkpointed"
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# Plan A was to do something similar to 080-pause.bats: sleep for long
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# enough to cause a gap in the timestamps in the log. But checkpoint
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# doesn't seem to work like that: upon restore, even if we sleep a long
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# time, the newly-started container seems to pick back up close to
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# where it left off. (Maybe it's something about /proc/uptime?)
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# Anyway, scratch Plan A. Plan B is simply to make sure that the
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# restarted container spits something out.
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run_podman logs $cid
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local nlines_before="${#lines[*]}"
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# Restart immediately and confirm state
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run_podman container restore $cid
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is "$output" "$cid" "podman container restore"
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# Note that upon restore, .Checkpointed reverts to false (#12117)
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run_podman container inspect \
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--format '{{.State.Status}}:{{.State.Running}}:{{.State.Paused}}:{{.State.Checkpointed}}' $cid
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is "$output" "running:true:false:false" \
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"State. Status:Running:Pause:Checkpointed"
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# Pause briefly to let restarted container emit some output
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sleep 0.3
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# Get full logs, and make sure something changed
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run_podman logs $cid
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local nlines_after="${#lines[*]}"
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if [[ $nlines_after -eq $nlines_before ]]; then
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die "Container failed to output new lines after first restore"
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fi
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# Same thing again: test for https://github.com/containers/crun/issues/756
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# in which, after second checkpoint/restore, we lose logs
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run_podman container checkpoint $cid
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run_podman container logs $cid
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nlines_before="${#lines[*]}"
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run_podman container restore $cid
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# Give container time to write new output; then confirm that something
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# was emitted
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sleep 0.3
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run_podman container logs $cid
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nlines_after="${#lines[*]}"
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if [[ $nlines_after -eq $nlines_before ]]; then
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die "stdout went away after second restore (crun issue 756)"
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fi
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run_podman rm -t 0 -f $cid
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}
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@test "podman checkpoint --export, with volumes" {
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skip_if_remote "Test uses --root/--runroot, which are N/A over remote"
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# Create a root in tempdir. We will run a container here.
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local p_root=${PODMAN_TMPDIR}/testroot/root
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local p_runroot=${PODMAN_TMPDIR}/testroot/runroot
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mkdir -p $p_root $p_runroot
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# To avoid network pull, copy $IMAGE straight to temp root
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local p_opts="--root $p_root --runroot $p_runroot --events-backend file"
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run_podman save -o $PODMAN_TMPDIR/image.tar $IMAGE
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run_podman $p_opts load -i $PODMAN_TMPDIR/image.tar
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# Create a volume, find unused network port, and create a webserv container
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run_podman $p_opts volume create myvol
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local cname=c_$(random_string 10)
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local host_port=$(random_free_port)
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local server=http://127.0.0.1:$host_port
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run_podman $p_opts run -d --name $cname --volume myvol:/myvol \
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-p $host_port:80 \
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-w /myvol \
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$IMAGE sh -c "/bin/busybox-extras httpd -p 80;echo $cname >cname;echo READY;while :;do cat /proc/uptime >mydate.tmp;mv -f mydate.tmp mydate;sleep 0.1;done"
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local cid="$output"
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_PODMAN_TEST_OPTS="$p_opts" wait_for_ready $cid
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# Confirm that container responds
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run curl --max-time 3 -s $server/cname
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is "$output" "$cname" "curl $server/cname"
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run curl --max-time 3 -s $server/mydate
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local date_oldroot="$output"
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# Checkpoint...
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run_podman $p_opts container checkpoint \
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--ignore-rootfs \
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--export=$PODMAN_TMPDIR/$cname.tar.gz \
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$cname
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# ...confirm that port is now closed
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run curl --max-time 1 -s $server/mydate
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is "$status" "7" "cannot connect to port $host_port while container is down"
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# ...now restore it to our regular root
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run_podman container restore --import=$PODMAN_TMPDIR/$cname.tar.gz
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is "$output" "$cid"
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# Inspect (on regular root). Note that, unlike the basic test above,
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# .State.Checkpointed here is *false*.
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run_podman container inspect \
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--format '{{.State.Status}}:{{.State.Running}}:{{.State.Paused}}:{{.State.Checkpointed}}' $cname
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is "$output" "running:true:false:false" "State. Status:Running:Pause:Checkpointed"
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# Pause a moment to let the restarted container update the timestamp file
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sleep .3
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run curl --max-time 3 -s $server/mydate
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local date_newroot="$output"
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if [[ $date_newroot = $date_oldroot ]]; then
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die "Restored container did not update the timestamp file"
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fi
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run_podman exec $cid cat /myvol/cname
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is "$output" "$cname" "volume transferred fine"
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run_podman rm -t 0 -f $cid
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run_podman volume rm -f myvol
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}
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# FIXME: test --leave-running
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# vim: filetype=sh
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