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https://github.com/Start9Labs/start-os.git
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9b14d714ca
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114 lines
3.0 KiB
Bash
Executable File
114 lines
3.0 KiB
Bash
Executable File
# Local filesystem mounting -*- shell-script -*-
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#
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# This script overrides local_mount_root() in /scripts/local
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# and mounts root as a read-only filesystem with a temporary (rw)
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# overlay filesystem.
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#
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. /scripts/local
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local_mount_root()
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{
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echo 'using startos initramfs module'
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local_top
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local_device_setup "${ROOT}" "root file system"
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ROOT="${DEV}"
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# Get the root filesystem type if not set
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if [ -z "${ROOTFSTYPE}" ]; then
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FSTYPE=$(get_fstype "${ROOT}")
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else
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FSTYPE=${ROOTFSTYPE}
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fi
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local_premount
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# CHANGES TO THE ORIGINAL FUNCTION BEGIN HERE
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# N.B. this code still lacks error checking
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modprobe ${FSTYPE}
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checkfs ${ROOT} root "${FSTYPE}"
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echo 'mounting startos'
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mkdir /startos
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ROOTFLAGS="$(echo "${ROOTFLAGS}" | sed 's/subvol=\(next\|current\)//' | sed 's/^-o *$//')"
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if [ "${FSTYPE}" != "unknown" ]; then
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mount -t ${FSTYPE} ${ROOTFLAGS} ${ROOT} /startos
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else
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mount ${ROOTFLAGS} ${ROOT} /startos
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fi
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if [ -d /startos/images ]; then
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if [ -h /startos/config/current.rootfs ] && [ -e /startos/config/current.rootfs ]; then
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image=$(readlink -f /startos/config/current.rootfs)
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else
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image="$(ls -t1 /startos/images/*.rootfs | head -n1)"
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fi
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if ! [ -f "$image" ]; then
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>&2 echo "image $image not available to boot"
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exit 1
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fi
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else
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if [ -f /startos/config/upgrade ] && [ -d /startos/next ]; then
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oldroot=/startos/next
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elif [ -d /startos/current ]; then
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oldroot=/startos/current
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elif [ -d /startos/prev ]; then
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oldroot=/startos/prev
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else
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>&2 echo no StartOS filesystem found
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exit 1
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fi
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mkdir -p /startos/config/overlay/etc
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mv $oldroot/etc/fstab /startos/config/overlay/etc/fstab
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mv $oldroot/etc/machine-id /startos/config/overlay/etc/machine-id
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mv $oldroot/etc/ssh /startos/config/overlay/etc/ssh
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mkdir -p /startos/images
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mv $oldroot /startos/images/legacy.rootfs
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rm -rf /startos/next /startos/current /startos/prev
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ln -rsf /startos/images/old.squashfs /startos/config/current.rootfs
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image=$(readlink -f /startos/config/current.rootfs)
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fi
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mkdir /lower /upper
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if [ -d "$image" ]; then
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mount -r --bind $image /lower
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elif [ -f "$image" ]; then
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modprobe squashfs
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mount -r $image /lower
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else
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>&2 echo "not a regular file or directory: $image"
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exit 1
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fi
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modprobe overlay || insmod "/lower/lib/modules/$(uname -r)/kernel/fs/overlayfs/overlay.ko"
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# Mount a tmpfs for the overlay in /upper
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mount -t tmpfs tmpfs /upper
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mkdir /upper/data /upper/work
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mkdir -p /startos/config/overlay
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# Mount the final overlay-root in $rootmnt
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mount -t overlay \
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-olowerdir=/startos/config/overlay:/lower,upperdir=/upper/data,workdir=/upper/work \
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overlay ${rootmnt}
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mkdir -p ${rootmnt}/media/startos/config
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mount --bind /startos/config ${rootmnt}/media/startos/config
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mkdir -p ${rootmnt}/media/startos/images
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mount --bind /startos/images ${rootmnt}/media/startos/images
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mkdir -p ${rootmnt}/media/startos/root
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mount -r --bind /startos ${rootmnt}/media/startos/root
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mkdir -p ${rootmnt}/media/startos/current
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mount -r --bind /lower ${rootmnt}/media/startos/current
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} |