future-install-scripts/common

# generated from util-linux source: libmount/src/utils.c
declare -A pseudofs_types=([anon_inodefs]=1
                           [autofs]=1
                           [bdev]=1
                           [bpf]=1
                           [binfmt_misc]=1
                           [cgroup]=1
                           [cgroup2]=1
                           [configfs]=1
                           [cpuset]=1
                           [debugfs]=1
                           [devfs]=1
                           [devpts]=1
                           [devtmpfs]=1
                           [dlmfs]=1
                           [efivarfs]=1
                           [fuse.gvfs-fuse-daemon]=1
                           [fusectl]=1
                           [hugetlbfs]=1
                           [mqueue]=1
                           [nfsd]=1
                           [none]=1
                           [pipefs]=1
                           [proc]=1
                           [pstore]=1
                           [ramfs]=1
                           [rootfs]=1
                           [rpc_pipefs]=1
                           [securityfs]=1
                           [sockfs]=1
                           [spufs]=1
                           [sysfs]=1
                           [tmpfs]=1)

# generated from: pkgfile -vbr '/fsck\..+' | awk -F. '{ print $NF }' | sort
declare -A fsck_types=([cramfs]=1
                       [exfat]=1
                       [ext2]=1
                       [ext3]=1
                       [ext4]=1
                       [ext4dev]=1
                       [f2fs]=1
                       [jfs]=1
                       [minix]=1
                       [msdos]=1
                       [reiserfs]=1
                       [vfat]=1
                       [xfs]=1)

out() { printf "$1 $2\n" "${@:3}"; }
error() { out "==> ERROR:" "$@"; } >&2
warning() { out "==> WARNING:" "$@"; } >&2
msg() { out "==>" "$@"; }
msg2() { out "  ->" "$@";}
die() { error "$@"; exit 1; }

ignore_error() {
  "$@" 2>/dev/null
  return 0
}

in_array() {
  local i
  for i in "${@:2}"; do
    [[ $1 = "$i" ]] && return 0
  done
  return 1
}

chroot_add_mount() {
  mount "$@" && CHROOT_ACTIVE_MOUNTS=("$2" "${CHROOT_ACTIVE_MOUNTS[@]}")
}

chroot_maybe_add_mount() {
  local cond=$1; shift
  if eval "$cond"; then
    chroot_add_mount "$@"
  fi
}

chroot_setup() {
  CHROOT_ACTIVE_MOUNTS=()
  [[ $(trap -p EXIT) ]] && die '(BUG): attempting to overwrite existing EXIT trap'
  trap 'chroot_teardown' EXIT

  chroot_add_mount proc "$1/proc" -t proc -o nosuid,noexec,nodev &&
  chroot_add_mount sys "$1/sys" -t sysfs -o nosuid,noexec,nodev,ro &&
  ignore_error chroot_maybe_add_mount "[[ -d '$1/sys/firmware/efi/efivars' ]]" \
      efivarfs "$1/sys/firmware/efi/efivars" -t efivarfs -o nosuid,noexec,nodev &&
  chroot_add_mount udev "$1/dev" -t devtmpfs -o mode=0755,nosuid &&
  chroot_add_mount devpts "$1/dev/pts" -t devpts -o mode=0620,gid=5,nosuid,noexec &&
  chroot_add_mount shm "$1/dev/shm" -t tmpfs -o mode=1777,nosuid,nodev &&
  chroot_add_mount run "$1/run" -t tmpfs -o nosuid,nodev,mode=0755 &&
  chroot_add_mount tmp "$1/tmp" -t tmpfs -o mode=1777,strictatime,nodev,nosuid
}

chroot_teardown() {
  if (( ${#CHROOT_ACTIVE_MOUNTS[@]} )); then
    umount "${CHROOT_ACTIVE_MOUNTS[@]}"
  fi
  unset CHROOT_ACTIVE_MOUNTS
}

chroot_add_mount_lazy() {
  mount "$@" && CHROOT_ACTIVE_LAZY=("$2" "${CHROOT_ACTIVE_LAZY[@]}")
}

chroot_bind_device() {
  touch "$2" && CHROOT_ACTIVE_FILES=("$2" "${CHROOT_ACTIVE_FILES[@]}")
  chroot_add_mount $1 "$2" --bind
}

chroot_add_link() {
  ln -sf "$1" "$2" && CHROOT_ACTIVE_FILES=("$2" "${CHROOT_ACTIVE_FILES[@]}")
}

unshare_setup() {
  CHROOT_ACTIVE_MOUNTS=()
  CHROOT_ACTIVE_LAZY=()
  CHROOT_ACTIVE_FILES=()
  [[ $(trap -p EXIT) ]] && die '(BUG): attempting to overwrite existing EXIT trap'
  trap 'unshare_teardown' EXIT

  chroot_add_mount_lazy "$1" "$1" --bind &&
  chroot_add_mount proc "$1/proc" -t proc -o nosuid,noexec,nodev &&
  chroot_add_mount_lazy /sys "$1/sys" --rbind &&
  chroot_add_link "$1/proc/self/fd" "$1/dev/fd" &&
  chroot_add_link "$1/proc/self/fd/0" "$1/dev/stdin" &&
  chroot_add_link "$1/proc/self/fd/1" "$1/dev/stdout" &&
  chroot_add_link "$1/proc/self/fd/2" "$1/dev/stderr" &&
  chroot_bind_device /dev/full "$1/dev/full" &&
  chroot_bind_device /dev/null "$1/dev/null" &&
  chroot_bind_device /dev/random "$1/dev/random" &&
  chroot_bind_device /dev/tty "$1/dev/tty" &&
  chroot_bind_device /dev/urandom "$1/dev/urandom" &&
  chroot_bind_device /dev/zero "$1/dev/zero" &&
  chroot_add_mount run "$1/run" -t tmpfs -o nosuid,nodev,mode=0755 &&
  chroot_add_mount tmp "$1/tmp" -t tmpfs -o mode=1777,strictatime,nodev,nosuid
}

unshare_teardown() {
  chroot_teardown

  if (( ${#CHROOT_ACTIVE_LAZY[@]} )); then
    umount --lazy "${CHROOT_ACTIVE_LAZY[@]}"
  fi
  unset CHROOT_ACTIVE_LAZY

  if (( ${#CHROOT_ACTIVE_FILES[@]} )); then
    rm "${CHROOT_ACTIVE_FILES[@]}"
  fi
  unset CHROOT_ACTIVE_FILES
}

root_unshare="unshare --fork --pid"
user_unshare="$root_unshare --mount --map-auto --map-root-user --setuid 0 --setgid 0"

# This outputs code for declaring all variables to stdout. For example, if
# FOO=BAR, then running
#     declare -p FOO
# will result in the output
#     declare -- FOO="bar"
# This function may be used to re-declare all currently used variables and
# functions in a new shell.
declare_all() {
  # Remove read-only variables to avoid warnings. Unfortunately, declare +r -p
  # doesn't work like it looks like it should (declaring only read-write
  # variables). However, declare -rp will print out read-only variables, which
  # we can then use to remove those definitions.
  declare -p | grep -Fvf <(declare -rp)
  # Then declare functions
  declare -pf
}

try_cast() (
  _=$(( $1#$2 ))
) 2>/dev/null

valid_number_of_base() {
  local base=$1 len=${#2} i=

  for (( i = 0; i < len; i++ )); do
    try_cast "$base" "${2:i:1}" || return 1
  done

  return 0
}

mangle() {
  local i= chr= out=
  local {a..f}= {A..F}=

  for (( i = 0; i < ${#1}; i++ )); do
    chr=${1:i:1}
    case $chr in
      [[:space:]\\])
        printf -v chr '%03o' "'$chr"
        out+=\\
        ;;
    esac
    out+=$chr
  done

  printf '%s' "$out"
}

unmangle() {
  local i= chr= out= len=$(( ${#1} - 4 ))
  local {a..f}= {A..F}=

  for (( i = 0; i < len; i++ )); do
    chr=${1:i:1}
    case $chr in
      \\)
        if valid_number_of_base 8 "${1:i+1:3}" ||
            valid_number_of_base 16 "${1:i+1:3}"; then
          printf -v chr '%b' "${1:i:4}"
          (( i += 3 ))
        fi
        ;;
    esac
    out+=$chr
  done

  printf '%s' "$out${1:i}"
}

optstring_match_option() {
  local candidate pat patterns

  IFS=, read -ra patterns <<<"$1"
  for pat in "${patterns[@]}"; do
    if [[ $pat = *=* ]]; then
      # "key=val" will only ever match "key=val"
      candidate=$2
    else
      # "key" will match "key", but also "key=anyval"
      candidate=${2%%=*}
    fi

    [[ $pat = "$candidate" ]] && return 0
  done

  return 1
}

optstring_remove_option() {
  local o options_ remove=$2 IFS=,

  read -ra options_ <<<"${!1}"

  for o in "${!options_[@]}"; do
    optstring_match_option "$remove" "${options_[o]}" && unset 'options_[o]'
  done

  declare -g "$1=${options_[*]}"
}

optstring_normalize() {
  local o options_ norm IFS=,

  read -ra options_ <<<"${!1}"

  # remove empty fields
  for o in "${options_[@]}"; do
    [[ $o ]] && norm+=("$o")
  done

  # avoid empty strings, reset to "defaults"
  declare -g "$1=${norm[*]:-defaults}"
}

optstring_append_option() {
  if ! optstring_has_option "$1" "$2"; then
    declare -g "$1=${!1},$2"
  fi

  optstring_normalize "$1"
}

optstring_prepend_option() {
  local options_=$1

  if ! optstring_has_option "$1" "$2"; then
    declare -g "$1=$2,${!1}"
  fi

  optstring_normalize "$1"
}

optstring_get_option() {
  local opts o

  IFS=, read -ra opts <<<"${!1}"
  for o in "${opts[@]}"; do
    if optstring_match_option "$2" "$o"; then
      declare -g "$o"
      return 0
    fi
  done

  return 1
}

optstring_has_option() {
  local "${2%%=*}"

  optstring_get_option "$1" "$2"
}

dm_name_for_devnode() {
  read dm_name <"/sys/class/block/${1#/dev/}/dm/name"
  if [[ $dm_name ]]; then
    printf '/dev/mapper/%s' "$dm_name"
  else
    # don't leave the caller hanging, just print the original name
    # along with the failure.
    error 'Failed to resolve device mapper name for: %s' "$1"
  fi
}

fstype_is_pseudofs() {
  (( pseudofs_types["$1"] ))
}

fstype_has_fsck() {
  (( fsck_types["$1"] ))
}