CDROM stuff from apt-cdrom

Author: jgg
Date: 1998-11-29 01:19:27 GMT
CDROM stuff from apt-cdrom

1 files changed, 157 insertions, 0 deletions

diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc
new file mode 100644
index 000000000..58dff94d2
--- /dev/null
+++ b/apt-pkg/contrib/cdromutl.cc
@@ -0,0 +1,157 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+// $Id: cdromutl.cc,v 1.1 1998/11/29 01:19:27 jgg Exp $
+/* ######################################################################
+   
+   CDROM Utilities - Some functions to manipulate CDROM mounts.
+   
+   These are here for the cdrom method and apt-cdrom.
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/cdromutl.h"
+#endif
+#include <apt-pkg/cdromutl.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/md5.h>
+#include <apt-pkg/fileutl.h>
+
+#include <sys/wait.h>
+#include <sys/errno.h>
+#include <sys/vfs.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+									/*}}}*/
+
+// UnmountCdrom - Unmount a cdrom					/*{{{*/
+// ---------------------------------------------------------------------
+/* Forking umount works much better than the umount syscall which can 
+   leave /etc/mtab inconsitant. We drop all messages this produces. */
+bool UnmountCdrom(string Path)
+{
+   int Child = fork();
+   if (Child < -1)
+      return _error->Errno("fork","Failed to fork");
+
+   // The child
+   if (Child == 0)
+   {
+      // Make all the fds /dev/null
+      for (int I = 0; I != 10; I++)
+	 close(I);
+      for (int I = 0; I != 3; I++)
+	 dup2(open("/dev/null",O_RDWR),I);
+
+      const char *Args[10];
+      Args[0] = "umount";
+      Args[1] = Path.c_str();
+      Args[2] = 0;
+      execvp(Args[0],(char **)Args);      
+      exit(100);
+   }
+
+   // Wait for mount
+   int Status = 0;
+   while (waitpid(Child,&Status,0) != Child)
+   {
+      if (errno == EINTR)
+	 continue;
+      return _error->Errno("waitpid","Couldn't wait for subprocess");
+   }
+   
+   // Check for an error code.
+   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+      return false;
+   return true;
+}
+									/*}}}*/
+// MountCdrom - Mount a cdrom						/*{{{*/
+// ---------------------------------------------------------------------
+/* We fork mount and drop all messages */
+bool MountCdrom(string Path)
+{
+   int Child = fork();
+   if (Child < -1)
+      return _error->Errno("fork","Failed to fork");
+
+   // The child
+   if (Child == 0)
+   {
+      // Make all the fds /dev/null
+      for (int I = 0; I != 10; I++)
+	 close(I);      
+      for (int I = 0; I != 3; I++)
+	 dup2(open("/dev/null",O_RDWR),I);
+      
+      const char *Args[10];
+      Args[0] = "mount";
+      Args[1] = Path.c_str();
+      Args[2] = 0;
+      execvp(Args[0],(char **)Args);      
+      exit(100);
+   }
+
+   // Wait for mount
+   int Status = 0;
+   while (waitpid(Child,&Status,0) != Child)
+   {
+      if (errno == EINTR)
+	 continue;
+      return _error->Errno("waitpid","Couldn't wait for subprocess");
+   }
+   
+   // Check for an error code.
+   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+      return false;
+   return true;
+}
+									/*}}}*/
+// IdentCdrom - Generate a unique string for this CD			/*{{{*/
+// ---------------------------------------------------------------------
+/* We convert everything we hash into a string, this prevents byte size/order
+   from effecting the outcome. */
+bool IdentCdrom(string CD,string &Res)
+{
+   MD5Summation Hash;
+
+   string StartDir = SafeGetCWD();
+   if (chdir(CD.c_str()) != 0)
+      return _error->Errno("chdir","Unable to change to %s",CD.c_str());
+   
+   DIR *D = opendir(".");
+   if (D == 0)
+      return _error->Errno("opendir","Unable to read %s",CD.c_str());
+      
+   // Run over the directory
+   char S[300];
+   for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
+   {
+      // Skip some files..
+      if (strcmp(Dir->d_name,".") == 0 ||
+	  strcmp(Dir->d_name,"..") == 0)
+	 continue;
+   
+      sprintf(S,"%lu",Dir->d_ino);
+      Hash.Add(S);
+      Hash.Add(Dir->d_name);
+   };
+   
+   chdir(StartDir.c_str());
+   closedir(D);
+   
+   // Some stats from the fsys
+   struct statfs Buf;
+   if (statfs(CD.c_str(),&Buf) != 0)
+      return _error->Errno("statfs","Failed to stat the cdrom");
+   
+   sprintf(S,"%u %u",Buf.f_blocks,Buf.f_bfree);
+   Hash.Add(S);
+   
+   Res = Hash.Result().Value();
+   return true;   
+}
+									/*}}}*/