home-manager-generation/activate

activate

#!/nix/store/i0ay05pqkbnvpfijm52mmlrp6kmkl80c-bash-4.4-p12/bin/bash

set -eu
set -o pipefail

cd $HOME

export PATH="/nix/store/i0ay05pqkbnvpfijm52mmlrp6kmkl80c-bash-4.4-p12/bin:/nix/store/qd55j183ym04y43aam889xkimq704rdx-coreutils-8.29/bin:/nix/store/18ak9x2mqr2inprnr4biad04n6pi4bc5-diffutils-3.6/bin:/nix/store/8x05myb28xqwixakpz0xhqyb8735kvy7-findutils-4.6.0/bin:/nix/store/rhbm7javg5n5zmhhld7qbi23n5qc0srf-gnugrep-3.1/bin:/nix/store/zgr9zbw7p8gihn9h0nj8ggkcplrd9g7f-gnused-4.4/bin:/nix/store/hk3s7q3486lkkipv291m7y498q6rj0pp-ncurses-6.0-20171125/bin:/nix/store/ggj0xvnkx0r22x21z4jnz16vq6k76wx0-nix-1.11.16/bin${PATH:+:}$PATH"

. /nix/store/nwyv4ajhvn210ppigg1g9z177g0g4ls4-color-echo.sh

function setupVars() {
    local profilesPath="/nix/var/nix/profiles/per-user/$USER"
    local gcPath="/nix/var/nix/gcroots/per-user/$USER"
    local greatestGenNum

    greatestGenNum=$( \
        find "$profilesPath" -name 'home-manager-*-link' \
            | sed 's/^.*-\([0-9]*\)-link$/\1/' \
            | sort -rn \
            | head -1)

    if [[ -n "$greatestGenNum" ]] ; then
        oldGenNum=$greatestGenNum
        newGenNum=$((oldGenNum + 1))
    else
        newGenNum=1
    fi

    if [[ -e "$gcPath/current-home" ]] ; then
        oldGenPath="$(readlink -e "$gcPath/current-home")"
    fi

    genProfilePath="$profilesPath/home-manager"
    newGenPath="/nix/store/35ifr39r4119si4a7mij5dl8vs571c7c-home-manager-generation";
    newGenProfilePath="$profilesPath/home-manager-$newGenNum-link"
    newGenGcPath="$gcPath/current-home"
}

setupVars

echo "Starting home manager activation"

if [[ -v VERBOSE ]]; then
    export VERBOSE_ECHO=echo
    export VERBOSE_ARG="--verbose"
else
    export VERBOSE_ECHO=true
    export VERBOSE_ARG=""
fi

if [[ -v DRY_RUN ]] ; then
    echo "This is a dry run"
    export DRY_RUN_CMD=echo
else
    $VERBOSE_ECHO "This is a live run"
    export DRY_RUN_CMD=""
fi

$VERBOSE_ECHO "Activation variables:"
if [[ -v oldGenNum ]] ; then
    $VERBOSE_ECHO "  oldGenNum=$oldGenNum"
    $VERBOSE_ECHO "  oldGenPath=$oldGenPath"
else
    $VERBOSE_ECHO "  oldGenNum undefined (first run?)"
    $VERBOSE_ECHO "  oldGenPath undefined (first run?)"
fi
$VERBOSE_ECHO "  newGenPath=$newGenPath"
$VERBOSE_ECHO "  newGenNum=$newGenNum"
$VERBOSE_ECHO "  newGenProfilePath=$newGenProfilePath"
$VERBOSE_ECHO "  newGenGcPath=$newGenGcPath"
$VERBOSE_ECHO "  genProfilePath=$genProfilePath"


noteEcho Activating checkLinkTargets
function checkNewGenCollision() {
  local newGenFiles
  newGenFiles="$(readlink -e "$newGenPath/home-files")"
  find "$newGenFiles" -type f -print0 -or -type l -print0 \
          | xargs -0 bash /nix/store/82x5wqxp7fiblr0h4kn1a288d4wqhd0x-check "$newGenFiles"
}

checkNewGenCollision || exit 1


noteEcho Activating writeBoundary


noteEcho Activating installPackages
if nix-env -q | grep '^home-manager-path$'; then
  nix-env -e home-manager-path
fi


noteEcho Activating linkGeneration
function linkNewGen() {
  echo "Creating home file links in $HOME"

  local newGenFiles
  newGenFiles="$(readlink -e "$newGenPath/home-files")"
  find "$newGenFiles" -type f -print0 -or -type l -print0 \
    | xargs -0 bash /nix/store/6cy75vf9p441gv614gdc654183dv0cgr-link "$newGenFiles"
}

function cleanOldGen() {
  if [[ ! -v oldGenPath ]] ; then
    return
  fi

  echo "Cleaning up orphan links from $HOME"

  local newGenFiles oldGenFiles
  newGenFiles="$(readlink -e "$newGenPath/home-files")"
  oldGenFiles="$(readlink -e "$oldGenPath/home-files")"

  # Apply the cleanup script on each leaf in the old
  # generation. The find command below will print the
  # relative path of the entry.
  find "$oldGenFiles" '(' -type f -or -type l ')' -printf '%P\0' \
    | xargs -0 bash /nix/store/4rbvm2brng1fz7qi11sha2890pp4lk36-cleanup "$newGenFiles"
}

cleanOldGen

if [[ ! -v oldGenPath || "$oldGenPath" != "$newGenPath" ]] ; then
  echo "Creating profile generation $newGenNum"
  $DRY_RUN_CMD ln -Tsf $VERBOSE_ARG "$newGenPath" "$newGenProfilePath"
  $DRY_RUN_CMD ln -Tsf $VERBOSE_ARG $(basename "$newGenProfilePath") "$genProfilePath"
  $DRY_RUN_CMD ln -Tsf $VERBOSE_ARG "$newGenPath" "$newGenGcPath"
else
  echo "No change so reusing latest profile generation $oldGenNum"
fi

linkNewGen


noteEcho Activating reloadSystemD
if who | grep -q '^leo '; then
  XDG_RUNTIME_DIR=${XDG_RUNTIME_DIR:-/run/user/$(id -u)} \
    function isStartable() {
  local service="$1"
  [[ $(/nix/store/kassxrnp9s64mxg98dm4hh1h0138cgnl-systemd-234/bin/systemctl --user show -p RefuseManualStart "$service") == *=no ]]
}

function isStoppable() {
  if [[ -v oldGenPath ]] ; then
    local service="$1"
    [[ $(/nix/store/kassxrnp9s64mxg98dm4hh1h0138cgnl-systemd-234/bin/systemctl --user show -p RefuseManualStop "$service") == *=no ]]
  fi
}

function systemdPostReload() {
  local workDir
  workDir="$(mktemp -d)"

  if [[ -v oldGenPath ]] ; then
    local oldUserServicePath="$oldGenPath/home-files/.config/systemd/user"
  fi

  local newUserServicePath="$newGenPath/home-files/.config/systemd/user"
  local oldServiceFiles="$workDir/old-files"
  local newServiceFiles="$workDir/new-files"
  local servicesDiffFile="$workDir/diff-files"

  if [[ ! (-v oldUserServicePath && -d "$oldUserServicePath") \
      && ! -d "$newUserServicePath" ]]; then
    return
  fi

  if [[ ! (-v oldUserServicePath && -d "$oldUserServicePath") ]]; then
    touch "$oldServiceFiles"
  else
    find "$oldUserServicePath" \
      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
      | sort \
      > "$oldServiceFiles"
  fi

  if [[ ! -d "$newUserServicePath" ]]; then
    touch "$newServiceFiles"
  else
    find "$newUserServicePath" \
      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
      | sort \
      > "$newServiceFiles"
  fi

  diff \
    --new-line-format='+%L' \
    --old-line-format='-%L' \
    --unchanged-line-format=' %L' \
    "$oldServiceFiles" "$newServiceFiles" \
    > $servicesDiffFile || true

  local -a maybeRestart=( $(grep '^ ' $servicesDiffFile | cut -c2-) )
  local -a maybeStop=( $(grep '^-' $servicesDiffFile | cut -c2-) )
  local -a maybeStart=( $(grep '^+' $servicesDiffFile | cut -c2-) )
  local -a toRestart=( )
  local -a toStop=( )
  local -a toStart=( )

  for f in ${maybeRestart[@]} ; do
    if isStoppable "$f" \
        && isStartable "$f" \
        && /nix/store/kassxrnp9s64mxg98dm4hh1h0138cgnl-systemd-234/bin/systemctl --quiet --user is-active "$f" \
        && ! cmp --quiet \
            "$oldUserServicePath/$f" \
            "$newUserServicePath/$f" ; then
      toRestart+=("$f")
    fi
  done

  for f in ${maybeStop[@]} ; do
    if isStoppable "$f" ; then
      toStop+=("$f")
    fi
  done

  for f in ${maybeStart[@]} ; do
    if isStartable "$f" ; then
      toStart+=("$f")
    fi
  done

  rm -r $workDir

  local sugg=""

  if [[ -n "${toRestart[@]}" ]] ; then
    sugg="${sugg}systemctl --user restart ${toRestart[@]}\n"
  fi

  if [[ -n "${toStop[@]}" ]] ; then
    sugg="${sugg}systemctl --user stop ${toStop[@]}\n"
  fi

  if [[ -n "${toStart[@]}" ]] ; then
    sugg="${sugg}systemctl --user start ${toStart[@]}\n"
  fi

  if [[ -n "$sugg" ]] ; then
    echo "Suggested commands:"
    echo -n -e "$sugg"
  fi
}

$DRY_RUN_CMD /nix/store/kassxrnp9s64mxg98dm4hh1h0138cgnl-systemd-234/bin/systemctl --user daemon-reload
systemdPostReload

else
  echo "User leo not logged in. Skipping."
fi