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>
31 lines
1.1 KiB
Bash
Executable File
31 lines
1.1 KiB
Bash
Executable File
#!/bin/bash
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# These are useful, or at worst not harmful, for all images we build.
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set -e
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[ -n "$ARCH" ]
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[ -n "$TARGET_ROOT" ]
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shopt -s extglob
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IMG_PATH=~/.cache/image-create
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DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cloud-images.ubuntu.com/}
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DIB_RELEASE=${DIB_RELEASE:-quantal}
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BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
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SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/$DIB_RELEASE/current/SHA256SUMS}
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mkdir -p $IMG_PATH
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# TODO: don't cache -current 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 $SHA256SUMS -O $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
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wget $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
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pushd $IMG_PATH
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awk "/$BASE_IMAGE_FILE/ { print \$0 \".tmp\" }" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
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popd
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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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# Extract the base image
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sudo tar -C $TARGET_ROOT -xzf $IMG_PATH/$BASE_IMAGE_FILE
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sudo rmdir $TARGET_ROOT/lost+found
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