86 lines
2.2 KiB
Bash
86 lines
2.2 KiB
Bash
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#!@SHELL@
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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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# Copyright (c) 2015 William Hubbs <w.d.hubbs@gmail.com>
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# Released under the 2-clause BSD license.
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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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#
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apply_file() {
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[ $# -lt 1 ] && return 0
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FILE="$1"
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LINENUM=0
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### FILE FORMAT ###
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# See https://www.kernel.org/doc/Documentation/binfmt_misc.txt
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while read line; do
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LINENUM=$(( LINENUM+1 ))
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case $line in
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\#*) continue ;;
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\;*) continue ;;
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esac
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echo "${line}" > /proc/sys/fs/binfmt_misc/register
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rc=$?
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if [ $rc -ne 0 ]; then
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printf "binfmt: invalid entry on line %d of \`%s'\n" \
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"$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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[ -e /proc/sys/fs/binfmt_misc/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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[ -d $d ] && 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}\n${f##*/}"
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done # for f in ${d}
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done # for d in ${binfmt_dirs}
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binfmt_basenames="$(printf "${binfmt_basenames}\n" | 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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