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: v233.3~114
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=0abbcad2aa991459183cee29430c962d065f3a58;p=elogind.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/src/basic/proc-cmdline.c b/src/basic/proc-cmdline.c
index 281833f88..acdfec0a0 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