From dc227b579d71f92e24717dac09bbe3846d5a6597 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Sat, 25 Apr 2020 12:24:13 -0400
Subject: [PATCH] home-manager: respect NIX_STATE_DIR

This allows to install home-manager on a system without root access.

PR #1196
---
 home-manager/home-manager           | 12 +++++++-----
 modules/lib-bash/activation-init.sh |  5 +++--
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/home-manager/home-manager b/home-manager/home-manager
index 84daffe0..6903c7bf 100644
--- a/home-manager/home-manager
+++ b/home-manager/home-manager
@@ -221,7 +221,7 @@ function doListGens() {
         color="always"
     fi
 
-    pushd "/nix/var/nix/profiles/per-user/$USER" > /dev/null
+    pushd "$NIX_STATE_DIR/profiles/per-user/$USER" > /dev/null
     # shellcheck disable=2012
     ls --color=$color -gG --time-style=long-iso --sort time home-manager-*-link \
         | cut -d' ' -f 4- \
@@ -234,7 +234,7 @@ function doListGens() {
 function doRmGenerations() {
     setVerboseAndDryRun
 
-    pushd "/nix/var/nix/profiles/per-user/$USER" > /dev/null
+    pushd "$NIX_STATE_DIR/profiles/per-user/$USER" > /dev/null
 
     for generationId in "$@"; do
         local linkName="home-manager-$generationId-link"
@@ -254,11 +254,11 @@ function doRmGenerations() {
 
 function doRmAllGenerations() {
     $DRY_RUN_CMD rm $VERBOSE_ARG \
-        "/nix/var/nix/profiles/per-user/$USER/home-manager"*
+        "$NIX_STATE_DIR/profiles/per-user/$USER/home-manager"*
 }
 
 function doExpireGenerations() {
-    local profileDir="/nix/var/nix/profiles/per-user/$USER"
+    local profileDir="$NIX_STATE_DIR/profiles/per-user/$USER"
 
     local generations
     generations="$( \
@@ -372,7 +372,7 @@ function doUninstall() {
             $DRY_RUN_CMD rm $VERBOSE_ARG -r \
                 "${XDG_DATA_HOME:-$HOME/.local/share}/home-manager"
             $DRY_RUN_CMD rm $VERBOSE_ARG \
-                "/nix/var/nix/gcroots/per-user/$USER/current-home"
+                "$NIX_STATE_DIR/gcroots/per-user/$USER/current-home"
             ;;
         *)
             echo "Yay!"
@@ -454,6 +454,8 @@ function doHelp() {
     echo "  uninstall    Remove Home Manager"
 }
 
+readonly NIX_STATE_DIR="${NIX_STATE_DIR:-/nix/var/nix}"
+
 EXTRA_NIX_PATH=()
 HOME_MANAGER_CONFIG_ATTRIBUTE=""
 PASSTHROUGH_OPTS=()
diff --git a/modules/lib-bash/activation-init.sh b/modules/lib-bash/activation-init.sh
index ecf1f550..f95008ee 100755
--- a/modules/lib-bash/activation-init.sh
+++ b/modules/lib-bash/activation-init.sh
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 
 function setupVars() {
-    local profilesPath="/nix/var/nix/profiles/per-user/$USER"
-    local gcPath="/nix/var/nix/gcroots/per-user/$USER"
+    local nixStateDir="${NIX_STATE_DIR:-/nix/var/nix}"
+    local profilesPath="$nixStateDir/profiles/per-user/$USER"
+    local gcPath="$nixStateDir/gcroots/per-user/$USER"
 
     genProfilePath="$profilesPath/home-manager"
     newGenPath="@GENERATION_DIR@";