move libudev based code into libapt cdrom.cc class

3 files changed, 117 insertions, 2 deletions

diff --git a/apt-pkg/cdrom.cc b/apt-pkg/cdrom.cc
index a31602dfa..087ee321c 100644
--- a/apt-pkg/cdrom.cc
+++ b/apt-pkg/cdrom.cc
@@ -16,7 +16,7 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <algorithm>
-
+#include <dlfcn.h>
 
 #include "indexcopy.h"
 
@@ -844,3 +844,82 @@ bool pkgCdrom::Add(pkgCdromStatus *log)
 
    return true;
 }
+
+
+pkgUdevCdromDevices::pkgUdevCdromDevices() 
+  : libudev_handle(NULL)
+{
+
+}
+
+bool
+pkgUdevCdromDevices::Dlopen()
+{
+   // see if we can get libudev
+   void *h = ::dlopen("libudev.so.0", RTLD_LAZY);
+   if(h == NULL)
+      return false;
+
+   // get the pointers to the udev structs
+   libudev_handle = h;
+   udev_new = (udev* (*)(void)) dlsym(h, "udev_new");
+   udev_enumerate_add_match_property = (int (*)(udev_enumerate*, const char*, const char*))dlsym(h, "udev_enumerate_add_match_property");
+   udev_enumerate_scan_devices = (int (*)(udev_enumerate*))dlsym(h, "udev_enumerate_scan_devices");
+   udev_enumerate_get_list_entry = (udev_list_entry* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_list_entry");
+   udev_device_new_from_syspath = (udev_device* (*)(udev*, const char*))dlsym(h, "udev_device_new_from_syspath");
+   udev_enumerate_get_udev = (udev* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_udev");
+   udev_list_entry_get_name = (const char* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_name");
+   udev_device_get_devnode = (const char* (*)(udev_device*))dlsym(h, "udev_device_get_devnode");
+   udev_enumerate_new = (udev_enumerate* (*)(udev*))dlsym(h, "udev_enumerate_new");
+   udev_list_entry_get_next = (udev_list_entry* (*)(udev_list_entry*))dlsym(h, "udev_list_entry_get_next");
+   udev_device_get_property_value = (const char* (*)(udev_device *, const char *))dlsym(h, "udev_device_get_property_value");
+
+   return true;
+}
+
+vector<CdromDevice>
+pkgUdevCdromDevices::Scan()
+{
+   vector<CdromDevice> cdrom_devices;
+   struct udev_enumerate *enumerate;
+   struct udev_list_entry *l, *devices;
+   struct udev *udev_ctx;
+
+   if(libudev_handle == NULL)
+      return cdrom_devices;
+
+   udev_ctx = udev_new();
+   enumerate = udev_enumerate_new (udev_ctx);
+   udev_enumerate_add_match_property(enumerate, "ID_CDROM", "1");
+
+   udev_enumerate_scan_devices (enumerate);
+   devices = udev_enumerate_get_list_entry (enumerate);
+   for (l = devices; l != NULL; l = udev_list_entry_get_next (l))
+   {
+      CdromDevice cdrom;
+      struct udev_device *udevice;
+      udevice = udev_device_new_from_syspath (udev_enumerate_get_udev (enumerate), udev_list_entry_get_name (l));
+      if (udevice == NULL)
+	 continue;
+      const char* devnode = udev_device_get_devnode(udevice);
+      const char* mountpath = udev_device_get_property_value(udevice, "FSTAB_DIR");
+
+      // fill in the struct
+      cdrom.DeviceName = string(devnode);
+      if (mountpath) {
+	 cdrom.MountPath = mountpath;
+	 cdrom.Mounted = true;
+      } else {
+	 cdrom.Mounted = false;
+	 cdrom.MountPath = "";
+      }
+      cdrom_devices.push_back(cdrom);
+   } 
+   return cdrom_devices;
+}
+
+
+pkgUdevCdromDevices::~pkgUdevCdromDevices()
+{ 
+   dlclose(libudev_handle);
+}
diff --git a/apt-pkg/cdrom.h b/apt-pkg/cdrom.h
index 68d61c098..13e7203f4 100644
--- a/apt-pkg/cdrom.h
+++ b/apt-pkg/cdrom.h
@@ -67,5 +67,41 @@ class pkgCdrom
 };
 
 
+// class that uses libudev to find cdrom devices dynamically
+struct CdromDevice
+{
+   string DeviceName;
+   bool Mounted;
+   string MountPath;
+};
+
+class pkgUdevCdromDevices
+{
+ protected:
+   // libudev dlopen stucture
+   void *libudev_handle;
+   struct udev* (*udev_new)(void);
+   int (*udev_enumerate_add_match_property)(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
+   int (*udev_enumerate_scan_devices)(struct udev_enumerate *udev_enumerate);
+   struct udev_list_entry* (*udev_enumerate_get_list_entry)(struct udev_enumerate *udev_enumerate);
+   struct udev_device* (*udev_device_new_from_syspath)(struct udev *udev, const char *syspath);
+   struct udev* (*udev_enumerate_get_udev)(struct udev_enumerate *udev_enumerate);
+   const char* (*udev_list_entry_get_name)(struct udev_list_entry *list_entry);
+   const char* (*udev_device_get_devnode)(struct udev_device *udev_device);
+   struct udev_enumerate *(*udev_enumerate_new) (struct udev *udev);
+   struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *list_entry);
+   const char* (*udev_device_get_property_value)(struct udev_device *udev_device, const char *key);
+   // end libudev dlopen
+   
+ public:
+   pkgUdevCdromDevices();
+   virtual ~pkgUdevCdromDevices();
+
+   // try to open 
+   bool Dlopen();
+   vector<CdromDevice> Scan();
+};
+
+
 
 #endif
diff --git a/apt-pkg/makefile b/apt-pkg/makefile
index 087f17740..387151baf 100644
--- a/apt-pkg/makefile
+++ b/apt-pkg/makefile
@@ -15,7 +15,7 @@ LIBRARY=apt-pkg
 LIBEXT=$(GLIBC_VER)$(LIBSTDCPP_VER)
 MAJOR=4.7
 MINOR=0
-SLIBS=$(PTHREADLIB) $(INTLLIBS) -lutil
+SLIBS=$(PTHREADLIB) $(INTLLIBS) -lutil -ldl
 APT_DOMAIN:=libapt-pkg$(MAJOR)
 
 # Source code for the contributed non-core things