cb62bae9b8
Qemu-nbd does not perform well with older versions of qemu due to the lack of writeback caching mode. It also only builds qcow2 images and there is a desire for raw image support. Finally, qemu-nbd makes it very difficult to build images concurrently due to the somewhat opaque nature of how it selects a /dev/nbd# device. losetup, on the other hand, makes this process very straight forward. Change-Id: I309fad8af4fd1e8d1720c17b65e1897a76d5e897 Co-Author: Clint Byrum <clint@fewbar.com>
46 lines
1.5 KiB
Bash
Executable file
46 lines
1.5 KiB
Bash
Executable file
#!/bin/bash
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set -e
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[ -n "$ARCH" ]
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[ -n "$TARGET_ROOT" ]
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if [ 'amd64' = "$ARCH" ] ; then
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ARCH="x86_64"
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fi
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IMG_PATH=~/.cache/image-create
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DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://mattdm.fedorapeople.org/cloud-images/}
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DIB_RELEASE=${DIB_RELEASE:-Fedora18}
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BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-Cloud-$ARCH-latest.raw.tar.xz}
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BASE_IMAGE_TAR=$DIB_RELEASE-Cloud-$ARCH-latest.tgz
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mkdir -p $IMG_PATH
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# TODO: don't cache forever.
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if [ ! -f $IMG_PATH/$BASE_IMAGE_FILE ] ; then
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echo "Fetching Base Image"
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wget $DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
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mv $IMG_PATH/$BASE_IMAGE_FILE.tmp $IMG_PATH/$BASE_IMAGE_FILE
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fi
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if [ ! -f $IMG_PATH/$BASE_IMAGE_TAR ] ; then
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echo "Repacking base image as tarball."
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WORKING=$(mktemp -d)
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EACTION="rm -r $WORKING"
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trap "$EACTION" EXIT
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echo "Working in $WORKING"
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tar -xJC $WORKING -f $IMG_PATH/$BASE_IMAGE_FILE
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LOOPDEV=$(sudo losetup --show -r -f $WORKING/*.raw)
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EACTION="sudo losetup -d $LOOPDEV;$EACTION"
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trap "$EACTION" EXIT
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sudo partprobe $LOOPDEV
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mkdir $WORKING/mnt
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sudo mount ${LOOPDEV}p2 $WORKING/mnt
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EACTION="sudo umount -f $WORKING/mnt;$EACTION"
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trap "$EACTION" EXIT
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# Chroot in so that we get the correct uid/gid
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sudo chroot $WORKING/mnt bin/tar -cz . > $WORKING/tmp.tar
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mv $WORKING/tmp.tar $IMG_PATH/$BASE_IMAGE_TAR
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fi
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# Extract the base image
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sudo tar -C $TARGET_ROOT -xzf $IMG_PATH/$BASE_IMAGE_TAR
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sudo rmdir $TARGET_ROOT/lost+found
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