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pre_install () {
# Check that the group and users don't already exist
if [[ -n $(cut -d: -f1 /etc/group | grep -w nixbld) ]]; then
echo "The nixbld group already exists. This install cannot proceed."
exit 1
fi
for i in {1..10}; do
if [[ -n $(cut -d: -f1 /etc/passwd | grep -w nixbld$i) ]]; then
echo "The nixbld$i user already exists. This install cannot proceed."
exit 1
fi
done
}
create_users () {
# Create a nixbld group.
groupadd -r nixbld
# Create 10 nixbld{i} users
for i in {1..10}; do
useradd -g nixbld -G nixbld -r -N -M -d /var/empty -s /sbin/nologin nixbld$i
done
}
delete_users() {
# Remove the users
for i in {1..10}; do
userdel nixbld$i
done
# Remove the group
groupdel nixbld
}
create_store() {
# Create nix folders and set permissions
mkdir -p /nix/store
chown root.nixbld /nix/store
chmod 1775 /nix/store
mkdir -p -m 1777 /nix/var/nix/gcroots/per-user
mkdir -p -m 1777 /nix/var/nix/profiles/per-user
}
restore_store() {
# Restore folder permissions
chmod 755 /nix/store
chown root.root /nix/store
}
init_channels() {
# Initialize default nix channel
echo "Initializing default nix channel"
source /etc/profile.d/nix.sh
nix-channel --update
}
daemon_info() {
echo "To start the nix daemon, execute one of the following:"
echo
echo " systemctl enable nix-daemon.socket # Sets the daemon to start on next boot"
echo " systemctl enable --now nix-daemon.socket # Starts now and on next boot too"
echo
echo "Also, if this is a new install, you need to start a new login shell or otherwise"
echo
echo " source /etc/profile.d/nix.sh"
echo " source /etc/profile.d/nix-daemon.sh"
echo
echo "Once your environment is set-up, you will need to add some channels. You can see how"
echo "to do that here:"
echo " https://nixos.org/nix/manual/#sec-channels"
}
post_install() {
create_users
create_store
init_channels
daemon_info
}
pre_upgrade() {
systemctl stop nix-daemon.socket
systemctl stop nix-daemon
}
post_upgrade() {
delete_users
create_users
create_store
daemon_info
}
pre_remove() {
restore_store
delete_users
}
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