systemd/sysusers.generate-pre.sh
Zbigniew Jędrzejewski-Szmek 7e62bd0762 sysusers.generate-pre.sh: properly escape quotes in description strings
... (rhbz#2104141)

In the first version, I wanted to use POSIX quotes with $''. But that required
'printf %q', which brings in a dependency on coreutils.

Following mcr0mmand's suggestion, ${foo@Q} is used instead, which should work
equivalently, and does not require anything new.

Tested with 'sysusers.generate-pre.sh /usr/lib/sysusers.d/*conf'. The output is
the same before and after, apart from the dovecot user with a quote.
2023-04-26 13:27:07 +02:00

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#!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: true; tab-width: 4; -*-
# This script turns sysuser.d files into scriptlets mandated by Fedora
# packaging guidelines. The general idea is to define users using the
# declarative syntax but to turn this into traditional scriptlets.
user() {
user="$1"
uid="$2"
desc="$3"
group="$4"
home="$5"
shell="$6"
[ "$desc" = '-' ] && desc=
{ [ "$home" = '-' ] || [ "$home" = '' ]; } && home=/
{ [ "$shell" = '-' ] || [ "$shell" = '' ]; } && shell=/usr/sbin/nologin
if [ "$uid" = '-' ] || [ "$uid" = '' ]; then
cat <<-EOF
getent passwd '$user' >/dev/null || \\
useradd -r -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
EOF
else
cat <<-EOF
if ! getent passwd ${user@Q} >/dev/null; then
if ! getent passwd ${uid@Q} >/dev/null; then
useradd -r -u ${uid@Q} -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
else
useradd -r -g ${group@Q} -d ${home@Q} -s ${shell@Q} -c ${desc@Q} ${user@Q} || :
fi
fi
EOF
fi
}
group() {
group="$1"
gid="$2"
if [ "$gid" = '-' ]; then
cat <<-EOF
getent group ${group@Q} >/dev/null || groupadd -r ${group@Q} || :
EOF
else
cat <<-EOF
getent group ${group@Q} >/dev/null || groupadd -f -g ${gid@Q} -r ${group@Q} || :
EOF
fi
}
usermod() {
user="$1"
group="$2"
cat <<-EOF
if getent group ${group@Q} >/dev/null; then
usermod -a -G ${group@Q} '$user' || :
fi
EOF
}
parse() {
while read -r line || [ -n "$line" ] ; do
{ [ "${line:0:1}" = '#' ] || [ "${line:0:1}" = ';' ]; } && continue
line="${line## *}"
[ -z "$line" ] && continue
eval "arr=( $line )"
case "${arr[0]}" in
('u')
if [[ "${arr[2]}" == *":"* ]]; then
user "${arr[1]}" "${arr[2]%:*}" "${arr[3]}" "${arr[2]#*:}" "${arr[4]}" "${arr[5]}"
else
group "${arr[1]}" "${arr[2]}"
user "${arr[1]}" "${arr[2]}" "${arr[3]}" "${arr[1]}" "${arr[4]}" "${arr[5]}"
fi
;;
('g')
group "${arr[1]}" "${arr[2]}"
;;
('m')
group "${arr[2]}" "-"
user "${arr[1]}" "-" "" "${arr[1]}" "" ""
usermod "${arr[1]}" "${arr[2]}"
;;
esac
done
}
for fn in "$@"; do
[ -e "$fn" ] || continue
echo "# generated from $(basename "$fn")"
parse <"$fn"
done