systemd/sysusers.generate-pre.sh

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#!/bin/bash
# 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="$6"
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[ "$desc" = '-' ] && desc=
{ [ "$home" = '-' ] || [ "$home" = '' ]; } && home=/
{ [ "$shell" = '-' ] || [ "$shell" = '' ]; } && shell=/sbin/nologin
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if [ "$uid" = '-' ] || [ "$uid" = '' ]; then
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cat <<EOF
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getent passwd '$user' >/dev/null || \\
useradd -r -g '$group' -d '$home' -s '$shell' -c '$desc' '$user'
EOF
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else
cat <<EOF
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if ! getent passwd '$user' >/dev/null ; then
if ! getent passwd '$uid' >/dev/null ; then
useradd -r -u '$uid' -g '$group' -d '$home' -s /sbin/nologin -c '$desc' '$user'
else
useradd -r -g '$group' -d '$home' -s /sbin/nologin -c '$desc' '$user'
fi
fi
EOF
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fi
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}
group() {
group="$1"
gid="$2"
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if [ "$gid" = '-' ]; then
cat <<-EOF
getent group '$group' >/dev/null || groupadd -r '$group'
EOF
else
cat <<-EOF
getent group '$group' >/dev/null || groupadd -f -g '$gid' -r '$group'
EOF
fi
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}
parse() {
while read -r line || [ -n "$line" ] ; do
{ [ "${line:0:1}" = '#' ] || [ "${line:0:1}" = ';' ]; } && continue
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line="${line## *}"
[ -z "$line" ] && continue
eval "arr=( $line )"
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case "${arr[0]}" in
('u')
group "${arr[1]}" "${arr[2]}"
user "${arr[1]}" "${arr[2]}" "${arr[3]}" "${arr[1]}" "${arr[4]}" "${arr[5]}"
# TODO: user:group support
;;
('g')
group "${arr[1]}" "${arr[2]}"
;;
('m')
group "${arr[2]}" "-"
user "${arr[1]}" "-" "" "${arr[2]}"
;;
esac
done
}
for fn in "$@"; do
[ -e "$fn" ] || continue
echo "# generated from $(basename "$fn")"
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parse <"$fn"
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done