diff options
Diffstat (limited to 'remote/modules/run-virt/data/opt/openslx/vmchooser/run-virt-includes/setup_image_access.inc')
| -rw-r--r-- | remote/modules/run-virt/data/opt/openslx/vmchooser/run-virt-includes/setup_image_access.inc | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/remote/modules/run-virt/data/opt/openslx/vmchooser/run-virt-includes/setup_image_access.inc b/remote/modules/run-virt/data/opt/openslx/vmchooser/run-virt-includes/setup_image_access.inc new file mode 100644 index 00000000..4240d9ca --- /dev/null +++ b/remote/modules/run-virt/data/opt/openslx/vmchooser/run-virt-includes/setup_image_access.inc @@ -0,0 +1,98 @@ +########################################################### +# Include: Setup dnbd for image access, nfs/cifs fallback # +########################################################### + +# This will currently make sure that the variable +# VM_DISKFILE_RO is set which will contain the +# absolute path to the disk image to use for the vm +# session. +# When using DNBD3 this will differ from SRC_IMG_ABSOLUTE, +# otherwise it will be identical. +# In the future DNBD3 (or something else) might provide +# a CoW layer so we don't need snapshots etc. anymore. +# This include should set VM_DISKFILE_RW in that case to +# indicate to the virt plugin that it doesn't need to +# handle creating a temporary CoW layer itself. + +writelog "Setting up disk access for virtualizer/emulator ..." + +# Try to use dnbd3 to access the image +unset VM_DISKFILE_RO +unset dnbd3_fuse_mount_point + +setup_dnbd3 () { + # Mount path for images mounted with dnbd3-fuse + dnbd3_fuse_mount_point="$TMPDIR/dnbd3fuse.mnt" + mkdir -p "${dnbd3_fuse_mount_point}" + # start dnbd3-fuse in subshell + local dnbd3_tmplog="$TMPDIR/dnbd3fuse.log" + local dnbd3_exitflag="$TMPDIR/dnbd3exit$RANDOM" + local TIMEOUT vm_revision + rm -f -- "$dnbd3_exitflag" + ( + dnbd3-fuse -f -o allow_other,max_readahead=262144 -h "$SLX_DNBD3_SERVERS" -i "${SRC_IMG_RELATIVE}" "${dnbd3_fuse_mount_point}" > "$dnbd3_tmplog" 2>&1 + RET=$? + touch "$dnbd3_exitflag" + if [ "$RET" != "0" ]; then + writelog "dnbd3-fuse stopped working (Exit code $RET)" + slxlog "virt-dnbd3-fuse" "dnbd3-fuse stopped/refused serving '${SRC_IMG_RELATIVE}' from '${SLX_DNBD3_SERVERS}' with error code: $RET" "${dnbd3_tmplog}" + fi + ) & + # give it a bit of time + usleep 250000 + # check if we have the image + for TIMEOUT in 0.5 1 1 OUT; do + if [ -r "${dnbd3_fuse_mount_point}/img" ]; then + vm_revision="$(grep -m 1 "^Revision:" "${dnbd3_fuse_mount_point}/status" | cut -d" " -f2)" + VM_DISKFILE_RO="${dnbd3_fuse_mount_point}/img" + writelog "DNBD3: $SRC_IMG_RELATIVE on $VM_DISKFILE_RO with rid $vm_revision" + break + fi + [ "$TIMEOUT" = "OUT" -o -e "$dnbd3_exitflag" ] && break + sleep "$TIMEOUT" + done + + if [ -z "$VM_DISKFILE_RO" ]; then + slxlog "virt-dnbd3" "No dnbd3 server for ${SRC_IMG_RELATIVE} found, trying NFS/CIFS..." "$dnbd3_tmplog" + writelog "No working dnbd3 server found :-(" + fi +} + +# See if we should setup dnbd3 image access at all +if ! which dnbd3-fuse; then + writelog "Can't use dnbd3 as dnbd3-fuse binary is not in PATH" +elif [ -z "$SRC_IMG_RELATIVE" ]; then + writelog "Can't use dnbd3 as SRC_IMG_RELATIVE is not set" +elif [ -z "$SLX_DNBD3_SERVERS" ] || [ "x$SLX_VM_DNBD3" != "xyes" ]; then + writelog "Can't use dnbd3 as no servers are given in config, or SLX_VM_DNBD3 is not set to yes" +else + setup_dnbd3 +fi + +# VM_DISKFILE_RO will be empty if dnbd3 is not used or failed to connect. +# Let's try to fall back to NFS/CIFS via file system +if [ -z "$VM_DISKFILE_RO" ]; then + # Maybe we're reading a dnbd3 directory with RIDs encoded into the filename - use latest one + rid_suffix=$(ls -1 "${SRC_IMG_ABSOLUTE}.r"* | grep -E -o '\.r[0-9]+$' | grep -o -E '[0-9]+$' | sort -n | tail -n 1) + if [ -n "$rid_suffix" ]; then + # found + VM_DISKFILE_RO="${SRC_IMG_ABSOLUTE}.r${rid_suffix}" + elif [ -e "$SRC_IMG_ABSOLUTE" ]; then + # try name we got from xml in the first place + VM_DISKFILE_RO="$SRC_IMG_ABSOLUTE" + fi +fi + +# Check if virtual machine container file exists +if [ -z "$VM_DISKFILE_RO" ] || ! [ -e "${VM_DISKFILE_RO}" ]; then + slxlog "virt-image-missing" "VM image $VM_DISKFILE_RO not found!" + writelog "Virtual machine image ${VM_DISKFILE_RO} not found!" + error_user "Das Image für die gewählte Virtuelle Maschine konnte nicht gefunden werden. +Versuchen Sie zunächst, den Computer komplett neu zu starten. Sollte das Problem bestehen bleiben, wenden Sie sich bitte an den Support." + cleanexit 1 +fi + +readonly VM_DISKFILE_RO + +writelog "Disk file to use: $VM_DISKFILE_RO" + |