docker: Lookup from /proc/self/cgroup too

Refs https://github.com/moby/moby/issues/18355

(cherry picked from commit 57f0c3cc6a7e631f644d67f05b002c6004bb6601)

diff --git a/tests/docker/Makefile.am b/tests/docker/Makefile.am
index e2a95d8..401f372 100644 (file)
--- a/tests/docker/Makefile.am
+++ b/tests/docker/Makefile.am
@@ -24,6 +24,7 @@ EXTRA_DIST = \
        .dockerenv \
        .dockerinit \
        proc/cpuinfo \
+       proc/self/cgroup \
        proc/self/status \
        sbin/dmidecode \
        sbin/uname \

diff --git a/tests/docker/proc/self/cgroup b/tests/docker/proc/self/cgroup
new file mode 100644 (file)
index 0000000..5547637
--- /dev/null
+++ b/tests/docker/proc/self/cgroup
@@ -0,0 +1,13 @@
+12:devices:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+11:blkio:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+10:perf_event:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+9:pids:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+8:cpuset:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+7:rdma:/
+6:hugetlb:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+5:net_cls,net_prio:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+4:memory:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+3:freezer:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+2:cpu,cpuacct:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+1:name=systemd:/docker/2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae
+0::/system.slice/containerd.service

diff --git a/virt-what.in b/virt-what.in
index 900a05d..6330fd0 100644 (file)
--- a/virt-what.in
+++ b/virt-what.in
@@ -349,7 +349,8 @@ if ! "$skip_lkvm"; then
 fi
 
 # Check for Docker.
-if [ -f "${root}/.dockerenv" ] || [ -f "${root}/.dockerinit" ]; then
+if [ -f "${root}/.dockerenv" ] || [ -f "${root}/.dockerinit" ] || \
+   grep -qF /docker/ "${root}/proc/self/cgroup" 2>/dev/null; then
     echo docker
 fi