Add container preinstallimage support for Docker and Podman

Add --vm-use-container-preinstallimage option to enable using
preinstallimage as base container image during builds. Includes
configuration option OBS_WORKER_USE_CONTAINER_PREINSTALLIMAGE
and integration with worker startup scripts.

Author: mahdiyehmr

dist/obsworker

@@ -76,6 +76,9 @@ fi
 if [ -n "$OBS_WORKER_USE_MKFS_COPYIN" ]; then
     OBS_WORKER_USE_MKFS_COPYIN="--vm-use-mkfs-copyin"
 fi
+if [ -n "$OBS_WORKER_USE_CONTAINER_PREINSTALLIMAGE" ]; then
+    OBS_WORKER_USE_CONTAINER_PREINSTALLIMAGE="--vm-use-container-preinstallimage"
+fi
 
 if [ -n "$OBS_WORKER_SECURITY_LEVEL" ]; then
     OBS_WORKER_HOSTLABELS="OBS_WORKER_SECURITY_LEVEL_${OBS_WORKER_SECURITY_LEVEL} $OBS_WORKER_HOSTLABELS"
@@ -486,8 +489,8 @@ case "$1" in
             echo "screen -t $WORKERID nice -n $OBS_NICE ./bs_worker --hardstatus $vmopt $port $proto --root $R" \
                 "--statedir $workerdir/$I --id $WORKERID $REPO_PARAM $HUGETLBFS $HOSTLABELS" \
                 "$HOSTOWNER $OBS_JOBS $OBS_THREADS $OBS_TEST $OBS_WORKER_OPT $TMPFS $DEVICE $SWAP $MEMORY" \
-                "$OBS_CLEANUP_CHROOT $OBS_WIPE_AFTER_BUILD $OBS_WORKER_USE_MKFS_COPYIN $ARCH $EMULATOR" \
-                >> $screenrc
+                "$OBS_CLEANUP_CHROOT $OBS_WIPE_AFTER_BUILD $OBS_WORKER_USE_MKFS_COPYIN $OBS_WORKER_USE_CONTAINER_PREINSTALLIMAGE" \
+                "$ARCH $EMULATOR" >> $screenrc
             mkdir -p $workerdir/$I
         done
         detachflag=

dist/sysconfig.obs-server

@@ -297,6 +297,16 @@ OBS_VM_DISK_AUTOSETUP_MOUNT_OPTIONS=""
 #
 OBS_WORKER_USE_MKFS_COPYIN=""
 
+## Path:        Applications/OBS
+## Description: Enable using preinstallimage as container base image during build
+## Type:        ("yes" | "")
+## Default:     ""
+## Config:      OBS
+#
+# This is only possible for docker and podman containers
+#
+OBS_WORKER_USE_CONTAINER_PREINSTALLIMAGE=""
+
 ## Path:        Applications/OBS
 ## Description: Enable build in memory
 ## Type:        ("yes" | "")

src/backend/bs_worker

@@ -80,6 +80,7 @@ my $vm_initrd;
 my $vm_memory;
 my $vm_custom_option;
 my $vm_use_mkfs_copyin;
+my $use_container_preinstallimage;
 my $vm_enable_console;
 my $vm_worker_name;
 my $vm_worker_instance;
@@ -336,6 +337,8 @@ Usage: $0 [OPTION] --root <directory> --statedir <directory>
 
        --vm-network: enable network (kvm)
 
+       --vm-use-container-preinstallimage: use preinstallimage as container base image (docker|podman)
+
        --emulator-script <script>
                    : Define the emulator script 
 
@@ -547,6 +550,11 @@ while (@ARGV) {
     $vm_use_mkfs_copyin = 1;
     next;
   }
+  if ($ARGV[0] eq '--vm-use-container-preinstallimage') {
+    shift @ARGV;
+    $use_container_preinstallimage = 1;
+    next;
+  }
   if ($ARGV[0] eq '--vmdisk-rootsize') {
     shift @ARGV;
     $vmdisk_rootsize = shift @ARGV;
@@ -4117,6 +4125,7 @@ sub dobuild {
     push @args, '--root', $buildroot;
     push @args, '--vm-type', $vm;
     push @args, '--memory', $vm_memory if $vm_memory;
+    push @args, '--vm-use-container-preinstallimage' if ($vm eq 'docker' || $vm eq 'podman') && $use_container_preinstallimage;
   } else {
     print "VM-TYPE $vm not detected" if $vm;
     push @args, '--root', $buildroot;