When switching to a less privileged user id, VDR now sets the environment variables HOME, USER, LOGNAME and SHELL accordingly

CONTRIBUTORS

@@ -2790,6 +2790,8 @@ Manuel Reimer <Manuel.Reimer@gmx.de>
  seconds during replay
  for suggesting to synchronize system time to the transponder time using adjtime() in
  order to avoid discontinuities
+ for setting the environment variables HOME, USER, LOGNAME and SHELL accordingly
+ when switching to a less privileged user id
 
 Rene van den Braken <rene@vandenbraken.name>
  for reporting a bug in writing the PCR pid into the PMT in

HISTORY

@@ -7750,3 +7750,5 @@ Video Disk Recorder Revision History
 - Updated the introductory text of the vdr.1 man page.
 - Added a note to the INSTALL file regarding multiple disk setup becoming deprecated
   in a future version of VDR.
+- When switching to a less privileged user id, VDR now sets the environment variables
+  HOME, USER, LOGNAME and SHELL accordingly (thanks to Manuel Reimer).

vdr.c

@@ -22,7 +22,7 @@
  *
  * The project's page is at http://www.tvdr.de
  *
- * $Id: vdr.c 2.55 2013/03/12 13:27:40 kls Exp $
+ * $Id: vdr.c 2.56 2013/03/14 09:34:57 kls Exp $
  */
 
 #include <getopt.h>
@@ -87,7 +87,7 @@
 
 static int LastSignal = 0;
 
-static bool SetUser(const char *UserName, bool UserDump)//XXX name?
+static bool SetUser(const char *UserName, bool UserDump)
 {
   if (UserName) {
      struct passwd *user = getpwnam(UserName);
@@ -109,6 +109,10 @@ static bool SetUser(const char *UserName, bool UserDump)//XXX name?
         }
      if (UserDump && prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) < 0)
         fprintf(stderr, "vdr: warning - cannot set dumpable: %s\n", strerror(errno));
+     setenv("HOME", user->pw_dir, 1);
+     setenv("USER", user->pw_name, 1);
+     setenv("LOGNAME", user->pw_name, 1);
+     setenv("SHELL", user->pw_shell, 1);
      }
   return true;
 }