add GPSD_HOME environment variable support to gpsfake

check the environment variable GPSD_HOME to find gpsd on path specified
if not there check normal PATH env variable for gpsd
added note about GPSD_HOME in gpsfake.xml but might not be in correct location
changed regress-driver to use GPSD_HOME instead of adding current
directory to the PATH

3 files changed, 28 insertions, 12 deletions

diff --git a/gps/fake.py b/gps/fake.py
index d3e4bd0d..a9c37cf3 100644
--- a/gps/fake.py
+++ b/gps/fake.py
@@ -282,16 +282,27 @@ class DaemonInstance:
     def spawn(self, options, port, background=False, prefix=""):
         "Spawn a daemon instance."
         self.spawncmd = None
-        if not '/usr/sbin' in os.environ['PATH']:
-            os.environ['PATH']=os.environ['PATH'] + ":/usr/sbin"
-        for path in os.environ['PATH'].split(':'):
-            _spawncmd = "%s/gpsd" % path
-            if os.path.isfile(_spawncmd) and os.access(_spawncmd, os.X_OK):
-                self.spawncmd = _spawncmd
-                break
+
+	# Look for gpsd in GPSD_HOME env variable
+	if os.environ['GPSD_HOME'] :
+            for path in os.environ['GPSD_HOME'].split(':'):
+                _spawncmd = "%s/gpsd" % path
+                if os.path.isfile(_spawncmd) and os.access(_spawncmd, os.X_OK):
+                    self.spawncmd = _spawncmd
+                    break
+
+	# if we could not find it yet try PATH env variable for it
+	if not self.spawncmd:
+            if not '/usr/sbin' in os.environ['PATH']:
+                os.environ['PATH']=os.environ['PATH'] + ":/usr/sbin"
+            for path in os.environ['PATH'].split(':'):
+                _spawncmd = "%s/gpsd" % path
+                if os.path.isfile(_spawncmd) and os.access(_spawncmd, os.X_OK):
+                    self.spawncmd = _spawncmd
+                    break
 
         if not self.spawncmd:
-            raise DaemonError("Cannot execute gpsd: executable not found.")
+            raise DaemonError("Cannot execute gpsd: executable not found. Set GPSD_HOME env variable")
         # The -b option to suppress hanging on probe returns is needed to cope
         # with OpenBSD (and possibly other non-Linux systems) that don't support
         # anything we can use to implement the FakeGPS.read() method
diff --git a/gpsfake.xml b/gpsfake.xml
index cbeb8e95..17b6dd0a 100644
--- a/gpsfake.xml
+++ b/gpsfake.xml
@@ -160,6 +160,12 @@ be retrieved using <application>gpspipe</application>,
 <application>gpscat</application>, or
 <application>gpsmon</application> from the gpsd distribution, or any
 other application which is able to create a compatible output.</para>
+
+<para>If <application>gpsfake</application> exits with "Cannot execute
+gpsd: executable not found." the environment variable GPSD_HOME can be
+set to the path where gpsd can be found. (instead of adding that folder
+to the PATH envirnment variable</para>
+
 </refsect1>
 <refsect1 id='see_also'><title>SEE ALSO</title>
 <para>
diff --git a/regress-driver b/regress-driver
index 81c615ef..6cc040cc 100755
--- a/regress-driver
+++ b/regress-driver
@@ -8,12 +8,11 @@
 # Should return an empty blank string if tose are not present.
 starttime=`date +"%s" 2>/dev/null`
 
-# We need to have the build directory in $PATH to find the new gpsd
-# in case there is one in $PATH somewhere else in the system.
+# We need to have the build directory in $GPSD_HOME to find the new gpsd
 if [ "`dirname $0`" = "." ]; then
-    PATH=`pwd`:${PATH}
+    GPSD_HOME=`pwd`
 else
-    PATH=`dirname $0`:${PATH}
+    GPSD_HOME=`dirname $0`
 fi
 
 # Arrange to call a gpsfake in the source directory without fuss.