Fabio Erculiani
11 years ago
parent
5a9dc6ae08
commit
9bc5b60794
@ -0,0 +1,257 @@
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#!/bin/sh
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. /etc/initrd.d/00-common.sh
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. /etc/initrd.d/00-splash.sh
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. /etc/initrd.d/00-zfs.sh
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_fstype_init() {
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local fstype="${1}"
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if [ "${fstype}" = "btrfs" ]; then
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# start BTRFS volume detection, if available
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[ -x /sbin/btrfs ] && /sbin/btrfs device scan
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elif [ -z "${fstype}" ]; then
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warn_msg "Unable to detect the filesystem type (empty variable)"
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fi
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}
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_rootdev_detect() {
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local got_good_root=0
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while [ "${got_good_root}" != "1" ]; do
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case "${REAL_ROOT}" in
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LABEL=*|UUID=*)
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local root_dev=$(find_real_device "${REAL_ROOT}")
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if [ -n "${root_dev}" ]; then
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REAL_ROOT="${root_dev}"
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good_msg "Detected root: ${REAL_ROOT}"
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else
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bad_msg "Unable to resolve root: ${REAL_ROOT}"
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got_good_root=0
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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;;
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ZFS*)
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# zfs_rootdev_init will tweak ${REAL_ROOT}
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zfs_rootdev_init
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if [ "${?}" = "0" ]; then
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got_good_root=1
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else
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got_good_root=0
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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;;
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esac
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if [ -z "${REAL_ROOT}" ]; then
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# No REAL_ROOT determined/specified.
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# Prompt user for root block device.
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prompt_user "REAL_ROOT" "root block device"
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got_good_root=0
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# Check for a block device or NFS
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elif [ -b "${REAL_ROOT}" ] || is_nfs; then
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got_good_root=1
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else
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bad_msg "${REAL_ROOT} is an invalid root device..."
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REAL_ROOT=""
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got_good_root=0
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fi
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done
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return 0
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}
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_rootdev_mount() {
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local mount_opts=ro
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local mount_fstype="${ROOTFSTYPE}"
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local fstype=$(get_device_fstype "${REAL_ROOT}")
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if is_zfs_fstype "${fstype}"; then
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mount_fstype=zfs
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mount_opts=$(zfs_get_real_root_mount_flags)
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fi
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good_msg "Detected fstype: ${fstype}"
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good_msg "Using mount fstype: ${mount_fstype}"
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_fstype_init "${fstype}"
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local mopts="${mount_opts}"
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[ -n "${REAL_ROOTFLAGS}" ] && \
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mopts="${mopts},${REAL_ROOTFLAGS}"
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good_msg "Using mount opts: -o ${mopts}"
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mount -t "${mount_fstype}" -o "${mopts}" \
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"${REAL_ROOT}" "${NEW_ROOT}" || return 1
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return 0
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}
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_get_mounts_list() {
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awk '
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/^[[:blank:]]*#/ { next }
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{ print $1 }
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' ${NEW_ROOT}/etc/initramfs.mounts
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}
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_get_mount_fstype() {
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[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
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awk -v fs="$1" '
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/^[[:blank:]]*#/ { next }
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$2 == fs { print $3 }
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' ${NEW_ROOT}/etc/fstab
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}
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_get_mount_options() {
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[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
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awk -v fs="$1" '
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/^[[:blank:]]*#/ { next }
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$2 == fs { print $4 }
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' ${NEW_ROOT}/etc/fstab
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}
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_get_mount_device() {
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[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
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awk -v fs="$1" '
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/^[[:blank:]]*#/ { next }
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$2 == fs { print $1 }
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' ${NEW_ROOT}/etc/fstab
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}
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# If the kernel is handed a mount option is does not recognize, it
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# WILL fail to mount. util-linux handles auto/noauto, but busybox
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# passes it straight to the kernel which then rejects the mount. To
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# make like a little easier, busybox mount does not care about
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# leading, trailing or duplicate commas.
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_strip_mount_options() {
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sed -r 's/(,|^)(no)?auto(,|$)/,/g'
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}
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real_root_init() {
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if [ -z "${REAL_ROOT}" ] && [ "${FAKE_ROOT}" != "/dev/ram0" ]; then
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REAL_ROOT="${FAKE_ROOT}"
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fi
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if [ -z "${REAL_INIT}" ] && [ "${FAKE_INIT}" != "/linuxrc" ]; then
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REAL_INIT="${FAKE_INIT}"
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fi
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if [ -z "${REAL_ROOTFLAGS}" ]; then
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REAL_ROOTFLAGS="${FAKE_ROOTFLAGS}"
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fi
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}
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# Read /etc/initramfs.mounts from ${NEW_ROOT} and mount the
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# listed filesystem mountpoints. For instance, /usr, which is
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# required by udev & systemd.
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ensure_initramfs_mounts() {
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local fslist=
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if [ -f "${NEW_ROOT}/etc/initramfs.mounts" ]; then
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fslist="$(_get_mounts_list)"
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else
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fslist="/usr"
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fi
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local dev= fstype= opts= mnt= cmd=
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for fs in ${fslist}; do
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mnt="${NEW_ROOT}${fs}"
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if mountpoint -q "${mnt}"; then
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good_msg "${fs} already mounted, skipping..."
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continue
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fi
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dev=$(_get_mount_device "${fs}")
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[ -z "${dev}" ] && continue
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# Resolve it like util-linux mount does
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[ -L "${dev}" ] && dev=$(readlink "${dev}")
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# In this case, it's probably part of the filesystem
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# and not a mountpoint
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[ -z "${dev}" ] && continue
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fstype=$(_get_mount_fstype "${fs}")
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if _get_mount_options "${fs}" | fgrep -q bind; then
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opts="bind"
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dev="${NEW_ROOT}${dev}"
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else
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# ro must be trailing, and the options will always
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# contain at least 'defaults'
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opts="$(_get_mount_options ${fs} | _strip_mount_options)"
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opts="${opts},ro"
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fi
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cmd="mount -t ${fstype} -o ${opts} ${dev} ${mnt}"
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good_msg "Mounting ${dev} as ${fs}: ${cmd}"
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if ! ${cmd}; then
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bad_msg "Unable to mount ${dev} for ${fs}"
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fi
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done
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}
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rootdev_init() {
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good_msg "Initializing root device..."
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while true; do
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if ! _rootdev_detect; then
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bad_msg "Could not mount specified ROOT, try again"
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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if is_livecd && ! is_nfs; then
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# CD already mounted; no further checks necessary
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break
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fi
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if [ "${LOOPTYPE}" = "sgimips" ]; then
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# sgimips mounts the livecd root partition directly
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# there is no isofs filesystem to worry about
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break
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fi
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good_msg "Mounting ${REAL_ROOT} as root..."
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# Try to mount the device as ${NEW_ROOT}
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local out=1
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if is_nfs; then
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find_nfs && out=0
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else
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_rootdev_mount && out=0
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fi
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if [ "${out}" != "0" ]; then
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bad_msg "Could not mount specified ROOT, try again"
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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# now that the root filesystem is mounted, before
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# checking the validity of ${NEW_ROOT} and ${REAL_INIT},
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# ensure that ${NEW_ROOT}/etc/initramfs.mounts entries
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# are mounted.
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ensure_initramfs_mounts
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# NFS does not need further checks here.
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is_nfs && break
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if [ ! -d "${NEW_ROOT}/dev" ]; then
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_msg="The filesystem ${REAL_ROOT},"
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_msg="${_msg} mounted at ${NEW_ROOT}"
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_msg="${_msg} does not contain /dev"
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_msg="${_msg}, init will likely fail..."
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bad_msg "${_msg}"
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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if [ ! -x "${NEW_ROOT}${REAL_INIT}" ]; then
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_msg="The filesystem ${REAL_ROOT},"
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_msg="${_msg} mounted at ${NEW_ROOT}"
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_msg="${_msg} does not contain a valid"
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_msg="${_msg} init=${REAL_INIT}"
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bad_msg "${_msg}"
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prompt_user "REAL_ROOT" "root block device"
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continue
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fi
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break
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done
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}
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