Run cgroup v2 tests using UML

.github/workflows/rust.yml

@@ -62,7 +62,6 @@ jobs:
       matrix:
         os:
           - "ubuntu-20.04"
-          - "macos-latest"
         rust-target:
           - "x86_64-unknown-linux-musl"
         cgroups:
@@ -80,7 +79,7 @@ jobs:
       - name: Test
         run: |
           bash ci/linux.sh
-        timeout-minutes: 10
+        timeout-minutes: 20
         env:
           CI_TARGET: ${{ matrix.rust-target }}
           CI_CGROUPS: ${{ matrix.cgroups }}

ci/linux.sh

@@ -6,44 +6,17 @@ echo "Operating system: $CI_OS"
 
 echo "this is hack, ignore this file" >> ./stracez-dummy 
 
-if [[ $CI_OS == "ubuntu-20.04" ]]; then
-  if [[ $CI_CGROUPS == "cgroup-v2" ]]; then
-    echo "Skipping: cgroup v2 runs in macos"
-    exit 0
-  fi
-fi 
-if [[ $CI_OS == "macos-latest" ]]; then
-  if [[ $CI_CGROUPS == "cgroup-v1" ]]; then
-    echo "Skipping: cgroup v1 does not need virtualization"
-    exit 0
-  fi
-fi
-
 echo "::group::Preparing"
 
 if [[ $CI_CGROUPS == "cgroup-v2" ]] && [ -z "${CI_VM+set}" ]; then
   echo "::group::Preparing virtual machine"
-  vagrant --version
-cat > Vagrantfile <<EOF
-Vagrant.configure("2") do |config|
-  config.vm.box = "fedora/32-cloud-base"
-
-  config.vm.provider "virtualbox" do |vb|
-    vb.memory = "700"
-  end
-end
-EOF
-  top -l 1
-  cat Vagrantfile
-  sudo vagrant up
-  echo "::group::Installing packages"
-  sudo vagrant ssh --command "sudo dnf install -y strace zip"
-  echo "::group::Entering VM"
-  sudo vagrant ssh --command "bash -c 'cd /vagrant && CI_OS=$CI_OS CI_CGROUPS=$CI_CGROUPS CI_TARGET=$CI_TARGET CI_VM=1 bash ci/linux.sh'" 
-  echo "Host: pulling logs from VM"
-  sudo vagrant ssh --command "cat /vagrant/logs.zip | base64" | base64 --decode > logs.zip
+  sudo apt install sshpass strace
+  wget http://ftp.debian.org/debian/pool/main/s/slirp/slirp_1.0.17-8_amd64.deb -O slirp.deb && sudo dpkg -i slirp.deb
+  ( cd uml-ci; ./main.sh; )
+  #sudo sshpass -p user ssh -p 2224 user@127.0.0.1 "cat /vagrant/logs.zip | base64" | base64 --decode > logs.zip # WTF??
+  sudo sshpass -p user ssh -p 2224 user@127.0.0.1 sudo poweroff || true
   rm stracez-dummy
-  unzip logs.zip
+  #unzip logs.zip
   sleep 10
   echo "Current directory after VM finish"
   ls .
@@ -63,5 +36,5 @@ sudo --preserve-env ./tests/$CI_TARGET/minion-tests --trace
 echo "::group::Finalize"
 echo "Current directory after running tests"
 ls .
-echo "Collecting logs to archive"
-zip logs.zip strace*
+#echo "Collecting logs to archive"
+#zip logs.zip strace*

uml-ci/main.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -e
+
+wget -q https://download.fedoraproject.org/pub/fedora/linux/releases/33/Cloud/x86_64/images/Fedora-Cloud-Base-33-1.2.x86_64.raw.xz -O img.xz
+unxz img.xz
+wget -q https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.93.tar.xz
+tar -xJf linux-5.4.93.tar.xz
+(
+cd linux-5.4.93
+export ARCH=um
+make defconfig
+bash
+cat >> .config << EOF
+CONFIG_CGROUP_PIDS=y
+CONFIG_MEMCG=y
+CONFIG_MEMCG_SWAP=y
+CONFIG_MEMCG_SWAP_ENABLED=y
+CONFIG_USER_NS=y
+CONFIG_PID_NS=y
+EOF
+make -j3
+)
+linux-5.4.93/linux mem=4096M ubda=img rootfstype=hostfs init="$PWD"/uml-setup.sh
+linux-5.4.93/linux mem=4096M ubda=img root=/dev/ubda1 rootfstype=ext4 hostfs=.. eth0=slirp,,./uml-slirp.sh &
+./uml-ssh.sh

uml-ci/payload.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+sudo dnf install -y strace zip
+export CI_OS=fedora
+export CI_CGROUPS=cgroup-v2
+export CI_TARGET=x86_64-unknown-linux-musl
+export CI_VM=1
+bash ci/linux.sh

uml-ci/uml-setup.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+mkdir /dev/mnt
+mount /dev/ubda1 /dev/mnt
+sed -i 's/.*PermitRootLogin.*/PermitRootLogin yes/' /dev/mnt/etc/ssh/sshd_config
+echo >> /dev/mnt/usr/lib/systemd/system/rc-local.service
+echo '[Install]' >> /dev/mnt/usr/lib/systemd/system/rc-local.service
+echo 'WantedBy=multi-user.target' >> /dev/mnt/usr/lib/systemd/system/rc-local.service
+sed -i 's/After=.*/After=sshd.service/' /dev/mnt/usr/lib/systemd/system/rc-local.service
+chroot /dev/mnt systemctl enable rc-local
+echo '#!/bin/bash
+
+echo root:root | chpasswd
+ifconfig eth0 10.0.2.15 netmask 255.255.255.0
+route add default dev eth0
+echo nameserver 10.0.2.3 > /etc/resolv.conf
+ifconfig -a > /dev/console
+route > /dev/console
+exit 0
+' > /dev/mnt/etc/rc.d/rc.local
+chmod +x /dev/mnt/etc/rc.d/rc.local
+umount /dev/mnt
+sync
+poweroff -f

uml-ci/uml-slirp.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec slirp-fullbolt 'host addr 10.0.2.2' 'redir tcp 2224 10.0.2.15:22'

uml-ci/uml-ssh.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# wait for vm startup
+while ! echo incompatible | nc 127.0.0.1 2224; do sleep 1; done
+
+set -e
+
+sleep 10
+sshpass -p root ssh -v -o 'StrictHostKeyChecking no' -p 2224 root@127.0.0.1 'sed -i '"'"'s/.*wheel.*/#\0/'"'"' /etc/sudoers; sed -i '"'"'s/#*\(.*wheel.*NOPASSWD.*\)/\1/'"'"' /etc/sudoers; adduser -g wheel --uid '"$(id -u)"' user; echo user:user | chpasswd'
+sshpass -p user ssh -v -o 'StrictHostKeyChecking no' -p 2224 user@127.0.0.1 'sudo mount -t hostfs hostfs ~; cd; exec uml-ci/payload.sh'