From 66cfed74c4a14d89c9c7078c7ce1c16d26af5d1e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Klaus=20K=C3=A4mpf?= <kkaempf@suse.de>
Date: Fri, 4 Apr 2014 22:03:29 +0200
Subject: [PATCH] Evaluate /proc/1/cmdline and check for systemd

Set 'systemd' class eventually.
---
 libenv/sysinfo.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/libenv/sysinfo.c b/libenv/sysinfo.c
index 901791220855..64ca0aa5a880 100644
--- a/libenv/sysinfo.c
+++ b/libenv/sysinfo.c
@@ -114,6 +114,7 @@ static time_t GetBootTimeFromUptimeCommand(time_t); // Last resort
 void CalculateDomainName(const char *nodename, const char *dnsname, char *fqname, char *uqname, char *domain);
 
 #ifdef __linux__
+static void Linux_Systemd(EvalContext *ctx);
 static int Linux_Os_Release(EvalContext *ctx);
 static int Linux_Fedora_Version(EvalContext *ctx);
 static int Linux_Redhat_Version(EvalContext *ctx);
@@ -929,14 +930,17 @@ static void OSClasses(EvalContext *ctx)
 #ifdef __linux__
     struct stat statbuf;
 
-/* Mandrake/Mandriva, Fedora and Oracle VM Server supply /etc/redhat-release, so
-   we test for those distributions first */
+    /* check for systemd init process */
+    Linux_Systemd(ctx);
 
     if (stat("/etc/os-release", &statbuf) != -1)
     {
         Linux_Os_Release(ctx);
     }
 
+/* Mandrake/Mandriva, Fedora and Oracle VM Server supply /etc/redhat-release, so
+   we test for those distributions first */
+
     if (stat("/etc/mandriva-release", &statbuf) != -1)
     {
         Linux_Mandriva_Version(ctx);
@@ -1220,6 +1224,50 @@ static void OSClasses(EvalContext *ctx)
 
 #ifdef __linux__
 
+static void Linux_Systemd(EvalContext *ctx)
+{
+    char proc1[CF_MAXVARSIZE];
+    struct stat statbuf;
+    char *slash;
+
+    if (!ReadLine("/proc/1/cmdline", proc1, sizeof(proc1)))
+    {
+        UnexpectedError("Failed to read /proc/1/cmdline");
+        return;
+    }
+
+    if (lstat(proc1, &statbuf) != 0)
+    {
+        UnexpectedError("Failed to stat %s", proc1);
+        return;
+    }
+    if (S_ISLNK(statbuf.st_mode))
+    {
+        int len;
+        len = readlink(proc1, proc1, sizeof(proc1));
+        if (len <= 0)
+        {
+            UnexpectedError("Failed to readlink %s", proc1);
+            return;
+        }
+        *(proc1 + len) = '\0';
+    }
+    Log(LOG_LEVEL_VERBOSE, "Init process: %s", proc1);
+    slash = strrchr(proc1, '/');
+    if (slash == NULL)
+    {
+        slash = proc1;
+    }
+    else
+    {
+        slash++;
+    }
+    if (strcmp(slash, "systemd") == 0)
+    {
+        EvalContextClassPutHard(ctx, slash, "inventory,attribute_name=none,source=agent");
+    }
+}
+
 static int Linux_Os_Release(EvalContext *ctx)
 {
 #define OS_REL_FILENAME "/etc/os-release"
-- 
1.8.4.5