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https://github.com/fosslinux/live-bootstrap.git
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6c2144e50a
* Use -S32 -H64 --force to trick sfdisk into allowing MiB-aligned partitions on a drive that reports a CHS geometry * Explicitly create partition at sector 2097152 (=1GiB) * Force mkfs.ext4 to overwrite any existing filesystem it might find * Wait up to 2 minutes for the disk to become readable (especially USB drives often show up with a delay)
47 lines
1.4 KiB
Bash
Executable file
47 lines
1.4 KiB
Bash
Executable file
#!/bin/sh
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#
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# SPDX-FileCopyrightText: 2023 fosslinux <fosslinux@aussies.space>
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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set -e
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# mount might fail if /etc doesn't exist because of fstab and mtab
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mkdir -p /dev /etc
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mount -t devtmpfs none /dev &> /junk || true # no /dev/null yet
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rm /junk &> /dev/null || true
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timeout=120
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while ! dd if=/dev/${DISK} of=/dev/null bs=512 count=1; do
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sleep 1
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# shellcheck disable=SC2219
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let timeout--
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if [ "${timeout}" -le 0 ]; then
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echo "Timeout reached for disk to become accessible"
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false
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fi
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done
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# Create partition if it doesn't exist
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if [ $(($(stat -c "%Lr" "/dev/${DISK}") % 8)) -eq 0 ]; then
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echo "Creating partition table..."
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# Start at 1GiB, use -S32 -H64 to align to MiB rather than cylinder boundary
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echo "2097152;" | sfdisk -uS -S32 -H64 --force "/dev/${DISK}"
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fdisk -l "/dev/${DISK}"
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echo "Creating ext4 partition..."
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mkfs.ext4 -F -F "/dev/${DISK}1"
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DISK="${DISK}1"
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fi
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# Mount the partition, move everything into /external
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mkdir -p /newroot
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mount -t ext4 "/dev/${DISK}" /newroot
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mkdir -p /newroot/external
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mv /newroot/* /newroot/external/ 2>/dev/null || true # obviously errors trying to move external into itself
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# Switch root
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mkdir -p /rootonly
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# This doesn't recursively mount - that's why we're able to copy everything over
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mount --bind / /rootonly
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cp -ar /rootonly/* /newroot/
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umount /rootonly
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switch_root /newroot /init
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