From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 12 Dec 2016 12:42:06 +0000 (+0100)
Subject: util-lib: read $SYSTEMD_PROC_CMDLINE if set when looking for the kernel cmdline
X-Git-Tag: v233~237^2~29
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=2467cc55f139cf540dc1ed6da5f3774fcbab4475;p=thirdparty%2Fsystemd.git

util-lib: read $SYSTEMD_PROC_CMDLINE if set when looking for the kernel cmdline

if we want to parse the kernel command line, let's check the
$SYSTEMD_PROC_CMDLINE environment variable first. This is useful for debugging
purposes.
---

diff --git a/ENVIRONMENT.md b/ENVIRONMENT.md
index 4ace45751f7..1ad2addfeef 100644
--- 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
diff --git a/src/basic/proc-cmdline.c b/src/basic/proc-cmdline.c
index 8297a222b76..98c94ed5e26 100644
--- a/src/basic/proc-cmdline.c
+++ b/src/basic/proc-cmdline.c
@@ -34,8 +34,22 @@
 #include "virt.h"
 
 int proc_cmdline(char **ret) {
+        const char *e;
         assert(ret);
 
+        /* For testing purposes it is sometimes useful to be able to override what we consider /proc/cmdline to be */
+        e = secure_getenv("SYSTEMD_PROC_CMDLINE");
+        if (e) {
+                char *m;
+
+                m = strdup(e);
+                if (!m)
+                        return -ENOMEM;
+
+                *ret = m;
+                return 0;
+        }
+
         if (detect_container() > 0)
                 return get_process_cmdline(1, 0, false, ret);
         else