47 lines
1.4 KiB
Bash
47 lines
1.4 KiB
Bash
#!/bin/sh
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set -euo pipefail
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UNIT_DIR="${1:-/tmp}"
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# For the heredoc below bash needs to create a file in $TMPDIR.
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# /tmp might not be mounted this early, but /run is.
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TMPDIR=/run
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for mnt in $(findmnt --fstab --options x-growpart.grow --output TARGET --noheadings); do
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dev="$(findmnt --fstab --target ${mnt} --evaluate --real --output SOURCE --noheadings)"
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mnt_esc="$(systemd-escape --path "${mnt}")"
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dev_esc="$(systemd-escape --path "${dev}")"
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# /dev/sda3 -> /dev/sda, /dev/nvme0n1p3 -> /dev/nvme0n1
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parent_dev="/dev/$(lsblk --nodeps -rno PKNAME "${dev}")"
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# Last number in the device name: /dev/nvme0n1p42 -> 42
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partnum="$(echo "${dev}" | sed 's/^.*[^0-9]\([0-9]\+\)$/\1/')"
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mkdir -p "${UNIT_DIR}/${mnt_esc}.mount.wants"
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cat > "${UNIT_DIR}/growpart@${dev_esc}.service" <<EOF
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[Unit]
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Description=Grow Partition Size of ${dev}
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DefaultDependencies=no
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BindsTo=${mnt_esc}.mount
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Conflicts=shutdown.target
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After=${mnt_esc}.mount
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Before=shutdown.target local-fs.target
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# Resize the partition before (possibly) resizing the file system
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Before=systemd-growfs@${mnt_esc}.service
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# growpart requires /tmp to operate
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Requires=tmp.mount
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After=tmp.mount
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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# Exit code 1 means "NOCHANGE"
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SuccessExitStatus=1
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ExecStart=/bin/sh -c "/usr/sbin/growpart ${parent_dev} ${partnum}"
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TimeoutSec=0
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EOF
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ln -sf "${UNIT_DIR}/growpart@${dev_esc}.service" "${UNIT_DIR}/${mnt_esc}.mount.wants/"
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done
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