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https://github.com/linuxkit/linuxkit.git
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56 lines
1.2 KiB
Bash
Executable File
56 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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set -e
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mkdir -p /tmp/image
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cd /tmp/image
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# input is a tarball of kernel and initrd.img on stdin
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# output is a compressed tarball of a raw disk image on stdout
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mkdir -p files
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cd files
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# extract. As guestfs base is currently Debian, no compression support
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# only if stdin is a tty, if so need files volume mounted...
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[ -t 0 ] || tar xf -
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INITRD="$(find . -name '*.img')"
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KERNEL="$(find . -name kernel -or -name bzImage)"
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CMDLINE="$*"
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[ "$KERNEL" = "./kernel" ] || mv "$KERNEL" kernel
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[ "$INITRD" = "./initrd.img" ] || mv "$INITRD" initrd.img
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# clean up subdirectories
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find . -mindepth 1 -maxdepth 1 -type d | xargs rm -rf
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# should be externally provided as GCP specific
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GCP_CONFIG="earlyprintk=ttyS0,115200 console=ttyS0,115200 vsyscall=emulate page_poison=1"
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CFG="DEFAULT linux
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LABEL linux
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KERNEL /kernel
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INITRD /initrd.img
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APPEND ${CMDLINE}
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"
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printf "$CFG" > syslinux.cfg
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cd ..
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tar cf files.tar -C files .
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virt-make-fs --size=1G --type=ext4 --partition files.tar disk.raw
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guestfish -a disk.raw -m /dev/sda1 <<EOF
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upload /usr/lib/SYSLINUX/mbr.bin /mbr.bin
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copy-file-to-device /mbr.bin /dev/sda size:440
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rm /mbr.bin
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extlinux /
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part-set-bootable /dev/sda 1 true
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EOF
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tar cf - disk.raw | gzip -9
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