System tests for podman-update

The e2e tests are incomplete, because they're just too hard
for any human to read/maintain. This defines tests in a
table, so they're easily reviewed and updated. This makes
it very easy to see which options are actually tested and
which are not, under root/rootless cgroups v1/v2.

Signed-off-by: Ed Santiago <santiago@redhat.com>

test/system/280-update.bats

@@ -0,0 +1,130 @@
+#!/usr/bin/env bats   -*- bats -*-
+#
+# Tests for podman update
+#
+
+load helpers
+
+LOOPDEVICE=
+
+function teardown() {
+    if [[ -n "$LOOPDEVICE" ]]; then
+        losetup -d $LOOPDEVICE
+        LOOPDEVICE=
+    fi
+    basic_teardown
+}
+
+
+@test "podman update - test all options" {
+
+    local cgv=1
+    if is_cgroupsv2; then
+        cgv=2;
+    fi
+
+    # Need a block device for blkio-weight-device testing
+    local pass_loop_device=
+    if ! is_rootless; then
+        if is_cgroupsv2; then
+            lofile=${PODMAN_TMPDIR}/disk.img
+            fallocate -l 1k  ${lofile}
+            LOOPDEVICE=$(losetup --show -f $lofile)
+            pass_loop_device="--device $LOOPDEVICE"
+
+            # Get maj:min (tr needed because losetup seems to use %2d)
+            lomajmin=$(losetup -l --noheadings --output MAJ:MIN $LOOPDEVICE | tr -d ' ')
+        fi
+    fi
+
+    # Shortcuts to make the table narrower
+    local -a gig=(0 1073741824 2147483648 3221225472)
+    local devicemax="1:5 rbps=10485760 wbps=31457280 riops=2000 wiops=4000"
+    local mm=memory/memory
+
+    # Format:
+    #   --<option> = <value>  | rootless? | check: cgroups v1            | check: cgroups v2
+    #
+    # Requires very wide window to read. Sorry.
+    #
+    # FIXMEs:
+    #  cpu-rt-period  (cgv1 only, on cpu/cpu.rt_period_us) works on RHEL8 but not on Ubuntu
+    #  cpu-rt-runtime (cgv1 only, on cpu/cpu.rt_runtime_us) fails: error setting cgroup config for procHooks ...
+    tests="
+cpu-shares          =            512 | - | cpu/cpu.shares       = 512              | cpu.weight      = 20
+cpus                =              5 | - | cpu/cpu.cfs_quota_us = 500000           | cpu.max         = 500000 100000
+cpuset-cpus         =              0 | - | cpuset/cpuset.cpus   = 0                | cpuset.cpus     = 0
+cpuset-mems         =              0 | - | cpuset/cpuset.mems   = 0                | cpuset.mems     = 0
+
+memory              =             1G | 2 | $mm.limit_in_bytes       = ${gig[1]}    | memory.max      = ${gig[1]}
+memory-swap         =             3G | 2 | $mm.memsw.limit_in_bytes = ${gig[3]}    | memory.swap.max = ${gig[2]}
+memory-reservation  =           400M | 2 | $mm.soft_limit_in_bytes  = 419430400    | memory.low      = 419430400
+
+blkio-weight        =            321 | - | -                                       | io.bfq.weight   = default 321 $lomajmin 98
+blkio-weight-device = $LOOPDEVICE:98 | - | -                                       | io.bfq.weight   = default 321 $lomajmin 98
+
+device-read-bps     = /dev/zero:10mb | - | -                                       | io.max          = $devicemax
+device-read-iops    = /dev/zero:2000 | - | -                                       | io.max          = $devicemax
+device-write-bps    = /dev/zero:30mb | - | -                                       | io.max          = $devicemax
+device-write-iops   = /dev/zero:4000 | - | -                                       | io.max          = $devicemax
+"
+
+    # Run a container
+    run_podman run ${pass_loop_device} -d $IMAGE sleep infinity
+    cid="$output"
+
+    # Pass 1: read the table above, gather up the options applicable
+    # to this test environment (root/rootless, cgroups v1/v2)
+    local -a opts
+    local -A check
+    while read opt works_rootless cgv1 cgv2; do
+        if is_rootless; then
+            local skipping="skipping --$opt : does not work rootless"
+            if [[ $works_rootless = '-' ]]; then
+                echo "[ $skipping ]"
+                continue
+            fi
+            if [[ ! $works_rootless =~ $cgv ]]; then
+                echo "[ $skipping on cgroups v$cgv ]"
+                continue
+            fi
+        fi
+
+        tuple=$cgv1
+        if is_cgroupsv2; then
+            tuple=$cgv2
+        fi
+        if [[ $tuple = '-' ]]; then
+            echo "[ skipping --$opt : N/A on cgroups v$cgv ]"
+            continue
+        fi
+
+        # OK: setting is applicable. Preserve it. (First removing whitespace)
+        opt=${opt// /}
+        opts+=("--$opt")
+        check["--$opt"]=$tuple
+    done < <(parse_table "$tests")
+
+    # Now do the update in one fell swoop
+    run_podman update "${opts[@]}" $cid
+
+    # ...and check one by one
+    for opt in "${opts[@]}"; do
+        read path op expect <<<"${check[$opt]}"
+        run_podman exec $cid cat /sys/fs/cgroup/$path
+
+        # Magic echo of unquoted-output converts newlines to spaces;
+        # important for otherwise multiline blkio file.
+        updated="$(echo $output)"
+        assert "$updated" $op "$expect" "$opt ($path)"
+    done
+
+    # Clean up
+    run_podman rm -f -t0 $cid
+    if [[ -n "$LOOPDEVICE" ]]; then
+        losetup -d $LOOPDEVICE
+        LOOPDEVICE=
+    fi
+}
+
+# vim: filetype=sh