nixpkgs/pkgs/os-specific/linux/systemd/0012-inherit-systemd-environment-when-calling-generators.patch

From a569dc0bdb43edb79e338c897f06de2dfa81cfc7 Mon Sep 17 00:00:00 2001
From: Andreas Rammhold <andreas@rammhold.de>
Date: Fri, 2 Nov 2018 21:15:42 +0100
Subject: [PATCH 12/18] inherit systemd environment when calling generators.

Systemd generators need access to the environment configured in
stage-2-init.sh since it schedules fsck and mkfs executions based on
being able to find an appropriate binary for the target filesystem.

With this commit I am altering the systemd behaviour since upstream
tries to gather environments with that they call
"environment-generators" and then seems to pass that on to all the other
executables that are being called from managers.
---
 src/core/manager.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/core/manager.c b/src/core/manager.c
index 1f1450b97c..26b9e41d78 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -4111,9 +4111,14 @@ static int manager_run_generators(Manager *m) {
         argv[4] = NULL;
 
         RUN_WITH_UMASK(0022)
-                (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, NULL, NULL,
-                                           (char**) argv, m->transient_environment, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
-
+                (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC,
+                                    // On NixOS we must propagate PATH to generators so they are
+                                    // able to find binaries such as `fsck.${fstype}` and
+                                    // `mkfs.${fstype}`. That is why the last argument of the
+                                    // function (envp) is set to NULL. This propagates systemd's
+                                    // environment (e.g. PATH) that was setup
+                                    // before calling systemd from stage-2-init.sh.
+                                    NULL, NULL, (char**) argv, /* NixOS: use inherited env */ NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
         r = 0;
 
 finish:
-- 
2.29.2