116 lines
4.2 KiB
Bash
116 lines
4.2 KiB
Bash
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#!/usr/bin/env bash
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REAL_BASE_DIR=$( dirname $( realpath "$0" ) )
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# Wrapper for nixos-rebuild operations, which act remotely.
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# Gets the necessary configuration to do so.
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# Takes the following arguments supplied as environment variables.
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# HOST: The host as defined in nixosConfigurations and the
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# deployment_configuration.json.
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# OPERATION: The nixos-rebuild operation to execute. Can be one of:
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# switch, boot, test, reboot
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# All operations are as defined in the nixos-rebuild man page except
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# for reboot, which runs boot, but then also reboots the host.
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if [ -z $HOST ]; then
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$REAL_BASE_DIR/../helper/msg_error.sh "\
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Internal Error: No host given.
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A host needs to be provided via the HOST environment variable."
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exit 1
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fi
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if [ -z $OPERATION ]; then
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$REAL_BASE_DIR/../helper/msg_error.sh "\
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Internal Error: No operation given.
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An operation needs to be provided via the OPERATION environment variable."
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exit 1
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fi
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ACTUAL_OPERATION=""
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case $OPERATION in
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switch|boot|test)
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ACTUAL_OPERATION="$OPERATION"
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;;
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reboot)
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ACTUAL_OPERATION="boot"
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;;
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*)
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$REAL_BASE_DIR/../helper/msg_error.sh "\
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Internal Error: No valid operation given.
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The operation provided via the OPERTION environment variable needs to be one of:
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switch, boot, test, reboot."
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exit 1
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;;
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esac
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TARGET_HOSTNAME=""
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TARGET_USER=""
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TARGET_PORT=""
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DEPLOYMENT_CONFIGURATION_EXISTS=true
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if ! [ -f deployment_configuration.json ]; then
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$REAL_BASE_DIR/../helper/msg_warning.sh "\
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Warning: No deployment_configuration.json exists and therefore it can't be used to retrieve configuration values."
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DEPLOYMENT_CONFIGURATION_EXISTS=false
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fi
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if $DEPLOYMENT_CONFIGURATION_EXISTS && ! cat deployment_configuration.json | jq . >/dev/null 2>&1; then
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$REAL_BASE_DIR/../helper/msg_warning.sh "\
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Warning: jq can't parse the deployment_configuration.json and therefore it can't be used to retrieve configuration values."
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fi
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if $DEPLOYMENT_CONFIGURATION_EXISTS && CONFIG_TARGET_HOSTNAME="$(cat deployment_configuration.json | jq -re .hosts.\"$HOST\".targetHostname 2>/dev/null)"; then
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TARGET_HOSTNAME=$CONFIG_TARGET_HOSTNAME
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elif NIX_CONFIG_FQDN="$(nix eval --raw .\#nixosConfigurations.$HOST.config.networking.fqdn 2>/dev/null)"; then
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TARGET_HOSTNAME=$NIX_CONFIG_FQDN
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else
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$REAL_BASE_DIR/../helper/msg_error.sh "\
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Error: Couldn't determine target hostname for $HOST.
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You either need to set targetHostname for this host in the deployment_configuration.json or have an FQDN available in the NixOS configuration of this host, which then gets used for the target hostname."
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exit 1
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fi
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if $DEPLOYMENT_CONFIGURATION_EXISTS && CONFIG_TARGET_USER="$(cat deployment_configuration.json | jq -re .hosts.\"$HOST\".targetUser 2>/dev/null)"; then
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TARGET_USER=$CONFIG_TARGET_USER
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elif $DEPLOYMENT_CONFIGURATION_EXISTS && CONFIG_DEFAULT_TARGET_USER="$(cat deployment_configuration.json | jq -re '.default.targetUser' 2>/dev/null)"; then
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TARGET_USER=$CONFIG_DEFAULT_TARGET_USER
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fi
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if $DEPLOYMENT_CONFIGURATION_EXISTS && CONFIG_TARGET_PORT="$(cat deployment_configuration.json | jq -re .hosts.\"$HOST\".targetPort 2>/dev/null)"; then
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TARGET_PORT=$CONFIG_TARGET_PORT
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elif $DEPLOYMENT_CONFIGURATION_EXISTS && CONFIG_DEFAULT_TARGET_PORT="$(cat deployment_configuration.json | jq -re '.default.targetPort' 2>/dev/null)"; then
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TARGET_PORT=$CONFIG_DEFAULT_TARGET_PORT
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fi
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TARGET_HOST="$TARGET_HOSTNAME"
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if [ -n "$TARGET_USER" ]; then
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TARGET_HOST="$TARGET_USER@$TARGET_HOST"
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fi
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SSHOPTS=""
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if [ -n "$TARGET_PORT" ]; then
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SSHOPTS="-o Port=$TARGET_PORT"
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fi
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set -e
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if [ -n "$TARGET_PORT" ]; then
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$REAL_BASE_DIR/../helper/msg_info.sh "\
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Running nixos-rebuild $ACTUAL_OPERATION for $HOST on $TARGET_HOST:$TARGET_PORT..."
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else
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$REAL_BASE_DIR/../helper/msg_info.sh "\
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Running nixos-rebuild $ACTUAL_OPERATION for $HOST on $TARGET_HOST..."
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fi
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env NIX_SSHOPTS="$SSHOPTS" nixos-rebuild "$ACTUAL_OPERATION" --flake ".#$HOST" --target-host "$TARGET_HOST" --use-substitutes --use-remote-sudo
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if [ "$OPERATION" = "reboot" ]; then
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$REAL_BASE_DIR/../helper/msg_info.sh "\
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Rebooting $TARGET_HOSTNAME..."
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ssh $SSH_OPTS "$TARGET_HOST" sudo systemctl reboot
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fi
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