1 files changed, 132 insertions, 0 deletions
diff --git a/displayconfig/displayconfig-hwprobe.py b/displayconfig/displayconfig-hwprobe.py
new file mode 100755
index 0000000..7ba5c69
--- /dev/null
+++ b/displayconfig/displayconfig-hwprobe.py
@@ -0,0 +1,132 @@
+#!/usr/bin/python
+###########################################################################
+# displayconfig-hwprobe.py - description                                  #
+# ------------------------------                                          #
+# begin     : Sun Jan 22 2006                                             #
+# copyright : (C) 2006 by Simon Edwards                                   #
+# email     : simon@simonzone.com                                         #
+#                                                                         #
+###########################################################################
+#                                                                         #
+#   This program is free software; you can redistribute it and/or modify  #
+#   it under the terms of the GNU General Public License as published by  #
+#   the Free Software Foundation; either version 2 of the License, or     #
+#   (at your option) any later version.                                   #
+#                                                                         #
+###########################################################################
+
+# This program should be run during boot time. It quickly examines the
+# graphics cards (read: PCI devices) in the computer and compares they to
+# the list in the file $hardware_info_filename. If the two lists differ
+# then the Debian package manager is automatically called to regenerate
+# /etc/X11/xorg.conf. This hopefully should mean that people can swap gfx
+# cards in and out and always have a system that will run Xorg. (even
+# though the config will be most likely be suboptimal. Suboptimal is better
+# than no X server).
+
+import ScanPCI
+import os
+import syslog
+import select
+
+hardware_info_filename = "/var/lib/guidance/guidance-gfxhardware-snapshot"
+data_file_dir = "/usr/share/apps/guidance/"
+
+def main():
+    # Scan the PCI bus.
+    pci_bus = ScanPCI.PCIBus(data_file_dir)
+    pci_bus.detect()
+
+    # Stuff our device info in to a string.
+    hardware_config = ""
+    for pci_device in pci_bus.devices:
+        if pci_device.isGfxCard():
+            hardware_config += "PCI:%i:%i:%i Vendor:%x Device:%x Subvendor:%x Subdevice:%x\n" % \
+                (pci_device.pci_bus, pci_device.pci_device, pci_device.pci_function,
+                pci_device.vendor, pci_device.device,
+                pci_device.subvendor, pci_device.subdevice)
+
+    # Read in the old gfx hardware info in.
+    previous_hardware = None
+    try:
+        fhandle = open(hardware_info_filename)
+        previous_hardware = fhandle.read()
+        fhandle.close()
+    except IOError:
+        previous_hardware = None
+
+    if previous_hardware is not None and previous_hardware!=hardware_config:
+        # Run dpkg and configure the new hardware.
+        syslog.syslog(syslog.LOG_INFO, "Graphics card hardware has changed. Reconfiguring xorg.conf using 'dpkg-reconfigure xserver-xorg'.")
+        cmd = ['dpkg-reconfigure','xserver-xorg']
+        environ = os.environ.copy()
+        environ['DEBIAN_FRONTEND'] = 'noninteractive'
+        #os.spawnvpe(os.P_WAIT, 'dpkg-reconfigure', cmd, environ)
+        result = ExecWithCapture('/usr/sbin/dpkg-reconfigure', cmd, 0, '/', 0,1, -1, environ)
+        for line in result.split('\n'):
+            syslog.syslog(syslog.LOG_INFO,"dpkg-reconfigure:"+line)
+
+        # [21:18] <Riddell> you are brave indeed
+        # [21:21] <Sime> I figured some kind of non-interactive "dpkg-reconfigure xorg" might be enough.
+        # [21:22] <Riddell> yep
+
+    if previous_hardware is None or previous_hardware!=hardware_config:
+        syslog.syslog(syslog.LOG_INFO, "Writing graphics card hardware list to "+hardware_info_filename)
+        # Write out the gfx hardware info
+        tmp_filename = hardware_info_filename + ".tmp"
+        fhandle = open(tmp_filename,'w')
+        fhandle.write(hardware_config)
+        fhandle.close()
+        os.rename(tmp_filename, hardware_info_filename)
+
+
+############################################################################
+def ExecWithCapture(command, argv, searchPath = 0, root = '/', stdin = 0,
+        catchfd = 1, closefd = -1, environ = None):
+
+    if not os.access(root + command, os.X_OK) and not searchPath:
+        raise RuntimeError, command + " can not be run"
+
+    (read, write) = os.pipe()
+    childpid = os.fork()
+    if (not childpid):
+        if (root and root != '/'): os.chroot(root)
+        os.dup2(write, catchfd)
+        os.close(write)
+        os.close(read)
+
+        if closefd != -1:
+            os.close(closefd)
+        if stdin:
+            os.dup2(stdin, 0)
+            os.close(stdin)
+
+        # Replace the environment
+        if environ is not None:
+            os.environ.clear()
+            os.environ.update(environ)
+
+        if searchPath:
+            os.execvp(command, argv)
+        else:
+            os.execv(command, argv)
+        sys.exit(1)
+    os.close(write)
+
+    rc = ""
+    s = "1"
+    while s:
+        select.select([read], [], [])
+        s = os.read(read, 1000)
+        rc = rc + s
+
+    os.close(read)
+
+    try:
+        os.waitpid(childpid, 0)
+    except OSError, (errno, msg):
+        print __name__, "waitpid:", msg
+
+    return rc
+
+main()