3b9dfcb43f
- Converting the image to raw first takes around 2 seconds in a ramdisk, but using dd to image the disk speeds up imaging almost 2x by allowing use of direct IO and blocksizes. - We may need, in the future, to be able to configure the options passed to dd based on the hardware we're imaging onto. These options have been confirmed as better than qemu-img on most hardware.
41 lines
1.1 KiB
Bash
Executable File
41 lines
1.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# This should work with almost any image that uses MBR partitioning and doesn't already
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# have 3 or more partitions.
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set -e
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log() {
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echo "`basename $0`: $@"
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}
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usage() {
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[[ -z "$1" ]] || echo -e "USAGE ERROR: $@\n"
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echo "`basename $0`: IMAGEFILE DEVICE"
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echo " - This script images DEVICE with IMAGEFILE"
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exit 1
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}
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IMAGEFILE="$1"
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DEVICE="$2"
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[[ -f $IMAGEFILE ]] || usage "$IMAGEFILE (IMAGEFILE) is not a file"
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[[ -b $DEVICE ]] || usage "$DEVICE (DEVICE) is not a block device"
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# In production this will be replaced with secure erasing the drives
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# For now we need to ensure there aren't any old (GPT) partitions on the drive
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log "Erasing existing mbr from ${DEVICE}"
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dd if=/dev/zero of=$DEVICE bs=512 count=10
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## Doing two steps allows us to use dd, which allows us to tweak things like
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## blocksize and allows use of direct io
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# Converts image to raw
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log "Imaging $IMAGEFILE to RAW format"
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qemu-img convert -O raw $IMAGEFILE /tmp/image.raw
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# Write image onto device
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log "Imaging $DEVICE"
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dd if=/tmp/image.raw of=$DEVICE bs=64K oflag=direct
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log "${DEVICE} imaged successfully!"
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