aed4799d6d
This patch adds support for squashfs as the root filesystem.
advantages:
- migrate from a existing -ext4 installation and back
with the sysupgrade utility
- existing partition layout will not be lost during switch
- slightly smaller image size as compared to the -ext4 image.
disadvantages:
- needs f2fs + tools. This is because fstools rootdisk.c decides based
on the partition size (currently root partitions > 100 MiB) f2fs is
used as the rootfs_data filesystem.
- rootfs_data is placed into the rootfs partition after the squashfs.
This makes it difficult for tools that expect a /dev/sda${X} device.
It also makes it difficult for data recovery tools as they might not
expect to find a embedded partition or will be slightly confused.
... or will not support f2fs.
For people with existing build configurations: make sure to include mkf2fs
and f2fsck packages into the image. Otherwise the new -squashfs image will
only boot from the ram-overlay.
Note:
All overlay data (configurations/all installed packages/...) will be
placed in inside the rootfs partition (i.e. /dev/sda2) just after the
squashfs image.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
27 lines
578 B
Bash
Executable file
27 lines
578 B
Bash
Executable file
#!/usr/bin/env bash
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set -x
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[ $# -eq 5 ] || {
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echo "SYNTAX: $0 <file> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
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exit 1
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}
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OUTPUT="$1"
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BOOTFS="$2"
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ROOTFS="$3"
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BOOTFSSIZE="$4"
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ROOTFSSIZE="$5"
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head=4
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sect=63
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set `ptgen -o $OUTPUT -h $head -s $sect -l 4096 -t 83 -p ${BOOTFSSIZE}M -t 83 -p ${ROOTFSSIZE}M`
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BOOTOFFSET="$(($1 / 512))"
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BOOTSIZE="$(($2 / 512))"
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ROOTFSOFFSET="$(($3 / 512))"
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ROOTFSSIZE="$(($4 / 512))"
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dd bs=512 if="$BOOTFS" of="$OUTPUT" seek="$BOOTOFFSET" conv=notrunc
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dd bs=512 if="$ROOTFS" of="$OUTPUT" seek="$ROOTFSOFFSET" conv=notrunc
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