Respect HOME environment variable if set

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

src/frontend/mosh-server.cc

@@ -776,17 +776,21 @@ static void print_motd( void )
 
 static void chdir_homedir( void )
 {
+  const char *home = getenv( "HOME" );
+  if ( home == NULL ) {
     struct passwd *pw = getpwuid( geteuid() );
     if ( pw == NULL ) {
       perror( "getpwuid" );
       return; /* non-fatal */
     }
+    home = pw->pw_dir;
+  }
 
-  if ( chdir( pw->pw_dir ) < 0 ) {
+  if ( chdir( home ) < 0 ) {
     perror( "chdir" );
   }
 
-  if ( setenv( "PWD", pw->pw_dir, 1 ) < 0 ) {
+  if ( setenv( "PWD", home, 1 ) < 0 ) {
     perror( "setenv" );
   }
 }