man: Document Domains for Router Advertisement network configuration

[thirdparty/systemd.git] / ENVIRONMENT.md

diff --git a/ENVIRONMENT.md b/ENVIRONMENT.md
index 4ace45751f710d97ae357da426de7af038d717bb..e542d4ec6fda3bd4f07b3e1cdb81992e83e75aa0 100644 (file)
--- a/ENVIRONMENT.md
+++ b/ENVIRONMENT.md
@@ -21,6 +21,11 @@ All tools:
 * `$SD_EVENT_PROFILE_DELAYS=1` — if set, the sd-event event loop implementation
   will print latency information at runtime.
 
+* `$SYSTEMD_PROC_CMDLINE` — if set, may contain a string that is used as kernel
+  command line instead of the actual one readable from /proc/cmdline. This is
+  useful for debugging, in order to test generators and other code against
+  specific kernel command lines.
+
 systemctl:
 
 * `$SYSTEMCTL_FORCE_BUS=1` — if set, do not connect to PID1's private D-Bus
@@ -54,3 +59,8 @@ systemd-logind:
 * `$SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1` — if set, report that
   hibernation is available even if the swap devices do not provide enough room
   for it.
+
+installed systemd tests:
+
+* `$SYSTEMD_TEST_DATA` — override the location of test data. This is useful if
+  a test executable is moved to an arbitrary location.