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|
#!/bin/sh
# shellcheck disable=SC3043
set -e
# Does what add-shell/remove-shell does, with the sync extras from
# update-shells, but does not add the link targets, only the lines
# listed; more safety checking; no regex escape issue; in contrast
# to the debianutils ones, it honours the admin’s choice disabling
# lines by commenting them, as in prefixing a single hash sign.
mogrifyshells() {
local basefile="$DPKG_ROOT/etc/shells"
local tmpa="$basefile.tmp"
local tmpb="$basefile.tmp2"
local rc=0 x mode='' oshf=$-
set +e
case $basefile in
(/*)
;;
(*)
echo >&2 "E: mogrifyshells: invalid DPKG_ROOT: $DPKG_ROOT"
exit 1 ;;
esac
(
set -o noclobber
cat "$basefile" >"$tmpa"
) || {
cat >&2 <<-EOF
E: add-shell/remove-shell is currently running or was previously interrupted
I: Please examine ${tmpa} to see if it should be moved onto ${basefile}
EOF
exit 1
}
for x in "$@"; do
case $x in
(+) mode=+; continue ;;
(-) mode=-; continue ;;
esac
case $mode in
(+)
grep -F -x -q -e "$x" -e "#$x" "$tmpa"
rc=$?
case $rc in
(0)
;;
(1)
printf '%s\n' "$x" >>"$tmpa"
;;
(*)
echo >&2 "E: mogrifyshells: grep error $rc"
rm -f "$tmpa"
exit 1 ;;
esac
;;
(-)
grep -F -x -v -e "$x" -e "#$x" "$tmpa" >"$tmpb"
rc=$?
case $rc in
(0|1)
;;
(*)
echo >&2 "E: mogrifyshells: grep error $rc"
rm -f "$tmpa" "$tmpb"
exit 1 ;;
esac
mv "$tmpb" "$tmpa" || {
echo >&2 "E: mogrifyshells: mv error"
rm -f "$tmpa" "$tmpb"
exit 1
}
;;
(*)
echo >&2 'E: mogrifyshells: no mode given'
rm -f "$tmpa"
exit 1
;;
esac
done
rc=0
chmod --reference="$basefile" "$tmpa" || {
x=$(stat -c %a "$basefile") || rc=1
chmod "0$x" "$tmpa" || rc=1
}
chown --reference="$basefile" "$tmpa" || {
x=$(stat -c %u:%g "$basefile") || rc=1
chown -- "$x" "$tmpa" || rc=1
}
sync -d -- "$tmpa" || rc=1
test 0 = "$rc" || {
echo >&2 'E: mogrifyshells: error during chmod/chown/fdatasync'
rm -f "$tmpa"
exit 1
}
mv -Z "$tmpa" "$basefile" || mv "$tmpa" "$basefile" || {
echo >&2 "E: mogrifyshells: error during mv back; $tmpa left"
exit 1 # but keep temporary
}
sync "$basefile" "${basefile%/*}" || {
echo >&2 "W: mogrifyshells: error during final sync"
# and pray
}
case $oshf in
(*e*) set -e ;;
esac
return 0
}
# This maintainer script can be called the following ways:
#
# * new-postinst "configure" [$most_recently_configured_version]
# The package is unpacked; all dependencies are unpacked and, when there
# are no circular dependencies, configured.
#
# * old-postinst "abort-upgrade" $new_version
# * old-postinst "abort-remove"
# * conflictors-postinst "abort-remove" "in-favour" $new_package
# $new_version
# * deconfigureds-postinst "abort-deconfigure" "in-favour"
# $failed_install_package $fip_version # new-package
# ["removing" $conflicting_package $cp_version] # old-package
# The package is unpacked; all dependencies are at least Half-Installed,
# previously been configured, and not removed. In some error situations,
# dependencies may not be even fully unpacked.
#
# * postinst "triggered" "${triggers[*]}"
# For trigger-only calls, i.e. if "configure" is not called.
#
# * new-postinst "reconfigure" [$most_recently_configured_version](?)
# Treat this as just like "configure" for a future extension by debconf.
case $1 in
(configure|reconfigure)
update-alternatives --install /bin/ksh ksh /bin/mksh 12 \
--slave /usr/share/man/man1/ksh.1.gz ksh.1.gz \
/usr/share/man/man1/mksh.1.gz \
--slave /bin/rksh rksh /bin/mksh \
--slave /usr/share/man/man1/rksh.1.gz rksh.1.gz \
/usr/share/man/man1/mksh.1.gz
update-alternatives --install /bin/ksh ksh /bin/mksh-static 11 \
--slave /usr/share/man/man1/ksh.1.gz ksh.1.gz \
/usr/share/man/man1/mksh-static.1.gz \
--slave /bin/rksh rksh /bin/mksh-static \
--slave /usr/share/man/man1/rksh.1.gz rksh.1.gz \
/usr/share/man/man1/mksh-static.1.gz
# create compatibility symlink if necessary
test -e /usr/bin/ksh || test -h /usr/bin/ksh || \
ln -s /bin/ksh /usr/bin/ksh
# also add nōn-canonical pathnames under /usr/bin/
um=+ # broken filesystem, unsupported by dpkg
# add us to /etc/shells and clean up old add-shell-caused damage
# shellcheck disable=SC2046
mogrifyshells + /bin/mksh /bin/mksh-static \
$um /usr/bin/mksh /usr/bin/mksh-static \
- $(for x in \
/usr/lib/klibc/bin \
/usr/lib/diet/bin \
/usr/lib/*-linux-musl*/bin \
; do echo "$x/mksh" "$x/mksh-static"; done)
;;
(abort-upgrade|abort-remove|abort-deconfigure)
;;
(triggered)
;;
(*)
echo >&2 "E: postinst called with unknown subcommand '$1'"
exit 1
;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
#DEBHELPER#
exit 0
|
