102 lines
3.2 KiB
Bash
Executable file
102 lines
3.2 KiB
Bash
Executable file
#!/bin/sh
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# This is a reimplementation of the systemd binfmt.d code to register
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# misc binary formats with the kernel.
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#
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# See the binfmt.d manpage as well:
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# http://0pointer.de/public/systemd-man/binfmt.d.html
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# This script should match the manpage as of 2015/03/31
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# Copyright (c) 2015 The OpenRC Authors.
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# See the Authors file at the top-level directory of this distribution and
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# https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
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#
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# This file is part of OpenRC. It is subject to the license terms in
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# the LICENSE file found in the top-level directory of this
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# distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
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# This file may not be copied, modified, propagated, or distributed
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# except according to the terms contained in the LICENSE file.
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apply_file() {
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[ $# -lt 1 ] && return 0
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FILE="$1"
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LINENUM=0
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### FILE FORMAT ###
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# See https://www.kernel.org/doc/Documentation/binfmt_misc.txt
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while read -r line; do
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LINENUM=$(( LINENUM+1 ))
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case $line in
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\#*) continue ;;
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\;*) continue ;;
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'') continue ;;
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esac
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reg=${line#*:}
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[ -e "$binfmt_fs/${reg%%:*}" ] && printf "%d" -1 > "$binfmt_fs/${reg%%:*}"
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printf "%s" "${line}" > "$binfmt_fs"/register
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rc=$?
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if [ $rc -ne 0 ]; then
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printf "binfmt: invalid entry on line %d of \`%s'\n" "$LINENUM" "$FILE" >&2
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error=1
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fi
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done < "$FILE"
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return "$rc"
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}
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readonly binfmt_fs="/proc/sys/fs/binfmt_misc"
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# Mount binfmt if it isn't mounted alraedy
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mountpoint -q $binfmt_fs || mount -t binfmt_misc binfmt $binfmt_fs
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[ -e "$binfmt_fs"/register ] || exit 0
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error=0
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if [ $# -gt 0 ]; then
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while [ $# -gt 0 ]; do
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apply_file "$1"
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shift
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done
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else
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# The hardcoding of these paths is intentional; we are following the
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# systemd spec.
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binfmt_dirs='/usr/lib/binfmt.d /run/binfmt.d /etc/binfmt.d'
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binfmt_basenames=''
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binfmt_d=''
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# Build a list of sorted unique basenames
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# directories declared later in the binfmt_d list will override earlier
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# directories, on a per file basename basis.
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# `/run/binfmt.d/foo.conf' supersedes `/usr/lib/binfmt.d/foo.conf'.
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# `/run/binfmt.d/foo.conf' will always be read after `/etc/binfmt.d/bar.conf'
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for d in ${binfmt_dirs}; do
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if [ -d "$d" ]; then
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for f in "${d}"/*.conf; do
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case "${f##*/}" in
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systemd.conf|systemd-*.conf) continue;;
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esac
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[ -e "$f" ] && binfmt_basenames="${binfmt_basenames} ${f##*/}"
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done
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fi
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done
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binfmt_basenames="$(printf "%s\n" "${binfmt_basenames}" | sort -u )"
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for b in $binfmt_basenames; do
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real_f=''
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for d in $binfmt_dirs; do
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f=${d}/${b}
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[ -e "${f}" ] && real_f=$f
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done
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[ -e "${real_f}" ] && binfmt_d="${binfmt_d} ${real_f}"
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done
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# loop through the gathered fragments, sorted globally by filename.
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# `/run/binfmt.d/foo.conf' will always be read after `/etc/binfmt.d/bar.conf'
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for FILE in $binfmt_d; do
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apply_file "$FILE"
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done
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fi
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exit $error
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# vim: set ts=2 sw=2 sts=2 noet ft=sh:
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