tinyramfs/lib/common.sh
2022-03-21 07:28:22 +03:00

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# vim: set ft=sh:
# shellcheck shell=sh
#
# https://shellcheck.net/wiki/SC2154
# shellcheck disable=2154
print()
{
printf "%s %s\n" "${2:-">>"}" "$1"
}
panic()
{
print "${1:-unexpected error occurred}" '!>' >&2
if [ "$$" = 1 ]; then
sh
else
exit 1
fi
}
# TODO ensure correctness
copy_file()
(
file=$1; dest=$2
[ -e "${tmpdir}/${dest}" ] && return
while [ -h "$file" ]; do
mkdir -p "${tmpdir}/${file%/*}"
cp -P "$file" "${tmpdir}/${file}"
cd -P "${file%/*}" || exit
symlink=$(ls -ld "$file")
symlink=${symlink##* -> }
case $symlink in
/*) file=$symlink ;;
*) file="${PWD}/${symlink##*/}" ;;
esac
done
[ -h "${tmpdir}/${dest}" ] && dest=$file
mkdir -p "${tmpdir}/${dest%/*}"
cp "$file" "${tmpdir}/${dest}"
[ "$3" ] && chmod "$3" "${tmpdir}/${dest}"
# https://shellcheck.net/wiki/SC2015
# shellcheck disable=2015
[ "$4" ] && strip "${tmpdir}/${dest}" > /dev/null 2>&1 || :
)
copy_exec()
{
_bin=$(command -v "$1")
case $_bin in /*) ;;
'')
panic "unable to find command: $1"
;;
*)
# https://shellcheck.net/wiki/SC2086
# shellcheck disable=2086
{ IFS=:; set -- $PATH; unset IFS; }
for _dir; do
__bin="${_dir}/${_bin}"
[ -x "$__bin" ] && break
done
# https://shellcheck.net/wiki/SC2015
# shellcheck disable=2015
[ -x "$__bin" ] && _bin=$__bin || panic "unable to find command: $_bin"
;;
esac
copy_file "$_bin" "/bin/${_bin##*/}" 0755 1
# TODO copy libs to the directory of interpreter.
ldd "$_bin" 2> /dev/null |
while read -r _lib || [ "$_lib" ]; do
_lib=${_lib#* => }
_lib=${_lib% *}
[ -e "$_lib" ] && copy_file "$_lib" "$_lib" 0755 1
done
}
copy_kmod()
{
modprobe -S "$kernel" -D "$1" 2> /dev/null |
while read -r _ _mod || [ "$_mod" ]; do
case $_mod in /*) copy_file "$_mod" "$_mod" 0644; esac
done
}
# TODO allow full path to hook
copy_hook()
{
for _dir in ${local+./hook} /etc/tinyramfs/hook.d /lib/tinyramfs/hook.d; do
_hook="${_dir}/${1}/${1}"
[ -f "$_hook" ] && break
done
[ -f "$_hook" ] || panic "unable to find hook: $1"
for _ext in init init.late; do
[ -f "${_hook}.${_ext}" ] || continue
print "copying hook: ${1}.${_ext}"
copy_file "${_hook}.${_ext}" "/lib/tinyramfs/hook.d/${1}/${1}.${_ext}" 0644
done
print "evaluating hook: $1"
# https://shellcheck.net/wiki/SC1090
# shellcheck disable=1090
. "$_hook"
}
resolve_device()
{
device=$1; _count=${2:-30}
case ${device%%=*} in
UUID) device="/dev/disk/by-uuid/${device#*=}" ;;
LABEL) device="/dev/disk/by-label/${device#*=}" ;;
PARTUUID) device="/dev/disk/by-partuuid/${device#*=}" ;;
/dev/*) ;;
*) return ;;
esac
# Race condition may occur if device manager is not yet initialized device.
# To fix this, we simply waiting until device is available. If device
# didn't appear in specified time, we panic.
while :; do
if [ -b "$device" ]; then
return
elif [ "$((_count -= 1))" = 0 ]; then
break
else
sleep 1
fi
done
panic "failed to lookup partition: $device"
}