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78 lines
3.1 KiB
Bash
78 lines
3.1 KiB
Bash
#!/usr/bin/env bash
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# mount_chroot <target>
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#
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# helper to reduce code duplication
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#
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mount_chroot() {
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local target
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target="$(realpath "$1")" # normalize, remove last slash if dir
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display_alert "mount_chroot" "$target" "debug"
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mount -t tmpfs tmpfs "${target}/tmp"
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mount -t proc chproc "${target}"/proc
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mount -t sysfs chsys "${target}"/sys
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mount -t devtmpfs chdev "${target}"/dev || mount --bind /dev "${target}"/dev
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mount -t devpts chpts "${target}"/dev/pts
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}
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# umount_chroot <target>
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#
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# helper to reduce code duplication
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#
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umount_chroot() {
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local target
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target="$(realpath "$1")" # normalize, remove last slash if dir
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display_alert "Unmounting" "$target" "info"
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while grep -Eq "${target}\/(dev|proc|sys|tmp)" /proc/mounts; do
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display_alert "Unmounting..." "target: ${target}" "debug"
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umount "${target}"/dev/pts || true
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umount --recursive "${target}"/dev || true
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umount "${target}"/proc || true
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umount "${target}"/sys || true
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umount "${target}"/tmp || true
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sync
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run_host_command_logged grep -E "'${target}/(dev|proc|sys|tmp)'" /proc/mounts "||" true
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done
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}
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# demented recursive version, for final umount. call: umount_chroot_recursive /some/dir "DESCRIPTION"
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function umount_chroot_recursive() {
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if [[ ! -d "${1}" ]]; then # only even try if target is a directory
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return 0
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fi
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local target description="${2:-"UNKNOWN"}"
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target="$(realpath "$1")/" # normalize, make sure to have slash as last element
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if [[ ! -d "${target}" ]]; then # only even try if target is a directory
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return 0 # success, nothing to do.
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elif [[ "${target}" == "/" ]]; then # make sure we're not trying to umount root itself.
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return 0
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fi
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display_alert "Unmounting recursively" "${description} - be patient" ""
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sync # sync. coalesce I/O. wait for writes to flush to disk. it might take a second.
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# First, try to umount some well-known dirs, in a certain order. for speed.
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local -a well_known_list=("dev/pts" "dev" "proc" "sys" "boot/efi" "boot/firmware" "boot" "tmp" ".")
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for well_known in "${well_known_list[@]}"; do
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umount --recursive "${target}${well_known}" &> /dev/null || true # ignore errors
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done
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# now try in a loop to unmount all that's still mounted under the target
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local -i tries=1 # the first try above
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mapfile -t current_mount_list < <(cut -d " " -f 2 "/proc/mounts" | grep "^${target}" || true) # don't let grep error out.
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while [[ ${#current_mount_list[@]} -gt 0 ]]; do
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if [[ $tries -gt 10 ]]; then
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display_alert "${#current_mount_list[@]} dirs still mounted after ${tries} tries:" "${current_mount_list[*]}" "wrn"
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fi
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cut -d " " -f 2 "/proc/mounts" | grep "^${target}" | xargs -n1 umount --recursive &> /dev/null || true # ignore errors
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sync # wait for fsync, then count again for next loop.
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mapfile -t current_mount_list < <(cut -d " " -f 2 "/proc/mounts" | grep "^${target}")
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tries=$((tries + 1))
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done
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# if more than one try..
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if [[ $tries -gt 1 ]]; then
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display_alert "Unmounted OK after ${tries} attempt(s)" "${description}" "info"
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fi
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return 0
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}
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