nix-processmgmt/tools/s6-rc/nixproc-s6-rc-switch.in

#!/bin/bash
set -e
shopt -s nullglob

showUsage()
{
    me="$(basename "$0")"

    cat <<EOF
Usage: $me [OPTION] PATH
  or: $me --undeploy [OPTION]
  or: $me --rollback [OPTION]
  or: $me --switch-generation NUM [OPTION]
  or: $me --list-generations [OPTION]
  or: $me --delete-generations NUM [OPTION]
  or: $me --delete-all-generations NUM [OPTION]

This command repopulates a folder with systemd configuration files and updates
the configuration so that obsolete services will be stoppped and new services
will be started.

Options:
      --undeploy        Undeploys all previously deployed processes
      --rollback        Rolls back to the previous deployment
      --switch-generation=NUM
                        Switches to a previous deployment generation
      --list-generations
                        Lists all profile generations of the current deployment
      --delete-generations=NUM
                        Deletes the specified generations. The number can
                        correspond to generation numbers, days (d postfix) or
                        'old'.
      --delete-all-generations
                        Deletes all profile generations. This is useful when a
                        deployment has been discarded
  -p, --profile=NAME    Name of the Nix profile that stores the sysvinit scripts
                        (defaults to: processes)
      --state-dir       Changes the directory in which the state of the
                        processes are stored
      --runtime-dir     Changes the directory in which the PID files are stored
      --log-dir         Changes the directory in which the log files are stored
      --tmp-dir         Changes the directory in which temp files are stored
      --cache-dir       Changes the directory in which cache files are stored
      --spool-dir       Changes the directory in which spool files are stored
      --lock-dir        Changes the directory in which lock files are stored
      --lib-dir         Changes the directory in which state files are stored
      --force-disable-user-change
                        Forces to not create users, groups or change user
                        permissions
      --show-trace      Shows a trace of the output
      --extra-params=PARAMS
                        A string with an attribute set in the Nix expression
                        language propagating extra parameters to the input models
  -h, --help            Shows the usage of this command

Environment:
  NIX_STATE_DIR         Overrides the location of the Nix state directory
  NIXPROC_PROCESSES     Path to a processes model
  NIXPROC_STATE_DIR     Changes the directory in which the state of the
                        processes is stored
  NIXPROC_RUNTIME_DIR   Changes the directory in which the PID files are stored
  NIXPROC_LOG_DIR       Changes the directory in which log files are stored
  NIXPROC_TMP_DIR       Changes the directory in which temp files are stored
  NIXPROC_CACHE_DIR     Changes the directory in which cache files are stored
  NIXPROC_SPOOL_DIR     Changes the directory in which spool files are stored
  NIXPROC_LOCK_DIR      Changes the directory in which lock files are stored
  NIXPROC_LIB_DIR       Changes the directory in which state files are stored
  NIXPROC_FORCE_DISABLE_USER_CHANGE
                        Forces to not create users, groups or change user
                        permissions
EOF
}

# Parse valid argument options

PARAMS=`@getopt@ -n $0 -o p:o:h -l undeploy,rollback,switch-generation:,list-generations,delete-generations:,delete-all-generations,profile:,state-dir:,runtime-dir:,log-dir:,tmp-dir:,cache-dir:,spool-dir:,lock-dir:,lib-dir:,force-disable-user-change,show-trace,extra-params:,help -- "$@"`

if [ $? != 0 ]
then
    showUsage
    exit 1
fi

# Evaluate valid options

eval set -- "$PARAMS"

while [ "$1" != "--" ]
do
    case "$1" in
        --undeploy)
            undeploy=1
            ;;
        --rollback)
            operation="switchGenerations"
            ;;
        --switch-to-generation)
            operation="switchGenerations"
            generationId=$2
            ;;
        --list-generations)
            operation="listGenerations"
            ;;
        --delete-generations)
            operation="deleteGenerations"
            generations="$2"
            ;;
        --delete-all-generations)
            operation="deleteAllGenerations"
            ;;
        -p|--profile)
            profile="$2"
            profileArg="-p $2"
            ;;
        -o|--old-profile)
            oldProfilePath="$2"
            oldProfileArg="-o $2"
            ;;
        --state-dir)
            stateDirArg="--state-dir $2"
            ;;
        --runtime-dir)
            runtimeDirArg="--runtime-dir $2"
            ;;
        --log-dir)
            logDirArg="--log-dir $2"
            ;;
        --tmp-dir)
            tmpDirArg="--tmp-dir $2"
            ;;
        --cache-dir)
            cacheDirArg="--cache-dir $2"
            ;;
        --spool-dir)
            spoolDirArg="--spool-dir $2"
            ;;
        --lock-dir)
            lockDirArg="--lock-dir $2"
            ;;
        --lib-dir)
            libDirArg="--lib-dir $2"
            ;;
        --force-disable-user-change)
            forceDisableUserChangeArg="--force-disable-user-change"
            ;;
        --show-trace)
            showTraceArg="--show-trace"
            ;;
        --extra-params)
            extraParamsArg=("--extra-params" "$2")
            ;;
        -h|--help)
            showUsage
            exit 0
            ;;
    esac

    shift
done

shift

# Validate the given options

source @commonchecks@

checkProcessesFile "$1"
checkNixStateDir
checkProfile
composeProfileBaseDir

# Execute deployment operation

deploy()
{
    nixproc-s6-rc-deploy $profileArg $stateDirArg $runtimeDirArg $logDirArg $tmpDirArg $cacheDirArg $spoolDirArg $lockDirArg $libDirArg $forceDisableUserChange $profilePath
}

executeDeploymentOperation s6-rc