home-manager/modules/lib-bash/activation-init.sh

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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="@GENERATION_DIR@";
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"