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nixpkgs/helpers/create-users-groups.sh

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cat "$2" | while true; do
read name || break
read gid
if ! curEnt=$(getent group "$name"); then
echo "creating group $name..."
groupadd --system \
"$name" \
${gid:+--gid $gid}
else
#echo "updating group $name..."
oldIFS="$IFS"; IFS=:; set -- $curEnt; IFS="$oldIFS"
prevGid=$3
if test -n "$gid" -a "$prevGid" != "$gid"; then
groupmod "$name" --gid $gid
fi
fi
done
cat "$1" | while true; do
read name || break
read description
read uid
read group
read extraGroups
read home
read shell
read createHome
if ! curEnt=$(getent passwd "$name"); then
echo "creating user $name..."
useradd --system \
"$name" \
--comment "$description" \
${uid:+--uid $uid} \
--gid "$group" \
--groups "$extraGroups" \
--home "$home" \
--shell "$shell" \
${createHome:+--create-home}
else
#echo "updating user $name..."
oldIFS="$IFS"; IFS=:; set -- $curEnt; IFS="$oldIFS"
prevUid=$3
prevHome=$6
# Don't change the UID if it's the same, otherwise usermod
# will complain.
if test "$prevUid" = "$uid"; then unset uid; fi
# Don't change the home directory if it's the same to prevent
# unnecessary warnings about logged in users.
if test "$prevHome" = "$home"; then unset home; fi
usermod \
"$name" \
--comment "$description" \
${uid:+--uid $uid} \
--gid "$group" \
--groups "$extraGroups" \
${home:+--home "$home"} \
--shell "$shell"
fi
done