X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/4df0b629aca0431f88248ce2e17702ff42367ca1..59194959326dbf114a5c894e4279c04844b4a793:/apt-pkg/contrib/cdromutl.cc

diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc
index 47eb3efc2..936e377fb 100644
--- a/apt-pkg/contrib/cdromutl.cc
+++ b/apt-pkg/contrib/cdromutl.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description								/*{{{*/
-// $Id: cdromutl.cc,v 1.2 1999/03/28 01:37:26 jgg Exp $
+// $Id: cdromutl.cc,v 1.12 2001/02/20 07:03:17 jgg Exp $
 /* ######################################################################
    
    CDROM Utilities - Some functions to manipulate CDROM mounts.
@@ -10,140 +10,199 @@
    ##################################################################### */
 									/*}}}*/
 // Include Files							/*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/cdromutl.h"
-#endif
+#include<config.h>
+
 #include <apt-pkg/cdromutl.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/md5.h>
 #include <apt-pkg/fileutl.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/strutl.h>
 
-#include <sys/wait.h>
-#include <sys/errno.h>
-#include <sys/vfs.h>
+#include <stdlib.h>
+#include <string.h>
+#include <iostream>
+#include <string>
+#include <vector>
+#include <sys/statvfs.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <stdio.h>
+
+#include <apti18n.h>
 									/*}}}*/
 
-// UnmountCdrom - Unmount a cdrom					/*{{{*/
+using std::string;
+
+// IsMounted - Returns true if the mount point is mounted		/*{{{*/
 // ---------------------------------------------------------------------
-/* 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)
+/* This is a simple algorithm that should always work, we stat the mount point
+   and the '..' file in the mount point and see if they are on the same device.
+   By definition if they are the same then it is not mounted. This should 
+   account for symlinked mount points as well. */
+bool IsMounted(string &Path)
 {
    if (Path.empty() == true)
       return false;
-   
+
    // Need that trailing slash for directories
    if (Path[Path.length() - 1] != '/')
       Path += '/';
-   
-   /* First we check if the path is actualy mounted, we do this by
-      stating the path and the previous directory (carefull of links!)
+
+   // if the path has a ".disk" directory we treat it as mounted
+   // this way even extracted copies of disks are recognized
+   if (DirectoryExists(Path + ".disk/") == true)
+      return true;
+
+   /* First we check if the path is actually mounted, we do this by
+      stating the path and the previous directory (careful of links!)
       and comparing their device fields. */
    struct stat Buf,Buf2;
    if (stat(Path.c_str(),&Buf) != 0 || 
        stat((Path + "../").c_str(),&Buf2) != 0)
-      return _error->Errno("stat","Unable to stat the mount point %s",Path.c_str());
+      return _error->Errno("stat",_("Unable to stat the mount point %s"),Path.c_str());
 
    if (Buf.st_dev == Buf2.st_dev)
+      return false;
+   return true;
+}
+									/*}}}*/
+// 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)
+{
+   // do not generate errors, even if the mountpoint does not exist
+   // the mountpoint might be auto-created by the mount command
+   // and a non-existing mountpoint is surely not mounted
+   _error->PushToStack();
+   bool const mounted = IsMounted(Path);
+   _error->RevertToStack();
+   if (mounted == false)
       return true;
-   
-   int Child = fork();
-   if (Child < -1)
-      return _error->Errno("fork","Failed to fork");
 
-   // The child
-   if (Child == 0)
+   for (int i=0;i<3;i++)
    {
-      // 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);
-   }
+   
+      int Child = ExecFork();
 
-   // 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");
+      // The child
+      if (Child == 0)
+      {
+	 // Make all the fds /dev/null
+	 int const null_fd = open("/dev/null",O_RDWR);
+	 for (int I = 0; I != 3; ++I)
+	    dup2(null_fd, I);
+
+	 if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true)
+	 {
+	    if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0)
+	       _exit(100);
+	    _exit(0);	 	 
+	 }
+	 else
+	 {
+	    const char *Args[10];
+	    Args[0] = "umount";
+	    Args[1] = Path.c_str();
+	    Args[2] = 0;
+	    execvp(Args[0],(char **)Args);      
+	    _exit(100);
+	 }      
+      }
+
+      // if it can not be umounted, give it a bit more time
+      // this can happen when auto-mount magic or fs/cdrom prober attack
+      if (ExecWait(Child,"umount",true) == true)
+	 return true;
+      sleep(1);
    }
-   
-   // Check for an error code.
-   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
-      return false;
-   return true;
+
+   return false;
 }
 									/*}}}*/
 // MountCdrom - Mount a cdrom						/*{{{*/
 // ---------------------------------------------------------------------
 /* We fork mount and drop all messages */
-bool MountCdrom(string Path)
+bool MountCdrom(string Path, string DeviceName)
 {
-   int Child = fork();
-   if (Child < -1)
-      return _error->Errno("fork","Failed to fork");
+   // do not generate errors, even if the mountpoint does not exist
+   // the mountpoint might be auto-created by the mount command
+   _error->PushToStack();
+   bool const mounted = IsMounted(Path);
+   _error->RevertToStack();
+   if (mounted == true)
+      return true;
+
+   int Child = ExecFork();
 
    // 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);
+      int const null_fd = open("/dev/null",O_RDWR);
+      for (int I = 0; I != 3; ++I)
+	 dup2(null_fd, I);
+
+      if (_config->Exists("Acquire::cdrom::"+Path+"::Mount") == true)
+      {
+	 if (system(_config->Find("Acquire::cdrom::"+Path+"::Mount").c_str()) != 0)
+	    _exit(100);
+	 _exit(0);	 
+      }
+      else
+      {
+	 const char *Args[10];
+	 Args[0] = "mount";
+	 if (DeviceName == "") 
+	 {
+	    Args[1] = Path.c_str();
+	    Args[2] = 0;
+	 } else {
+	    Args[1] = DeviceName.c_str();
+	    Args[2] = Path.c_str();
+	    Args[3] = 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;
+   return ExecWait(Child,"mount",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)
+bool IdentCdrom(string CD,string &Res,unsigned int Version)
 {
    MD5Summation Hash;
+   bool writable_media = false;
+
+   // if we are on a writable medium (like a usb-stick) that is just
+   // used like a cdrom don't use "." as it will constantly change,
+   // use .disk instead
+   if (access(CD.c_str(), W_OK) == 0 && DirectoryExists(CD+string("/.disk"))) 
+   {
+      writable_media = true;
+      CD = CD.append("/.disk");
+      if (_config->FindB("Debug::aptcdrom",false) == true)
+         std::clog << "Found writable cdrom, using alternative path: " << CD
+                   << std::endl;
+   }
 
    string StartDir = SafeGetCWD();
    if (chdir(CD.c_str()) != 0)
-      return _error->Errno("chdir","Unable to change to %s",CD.c_str());
+      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());
+      return _error->Errno("opendir",_("Unable to read %s"),CD.c_str());
       
    /* Run over the directory, we assume that the reader order will never
       change as the media is read-only. In theory if the kernel did
@@ -155,26 +214,83 @@ bool IdentCdrom(string CD,string &Res)
       if (strcmp(Dir->d_name,".") == 0 ||
 	  strcmp(Dir->d_name,"..") == 0)
 	 continue;
-   
-      sprintf(S,"%lu",Dir->d_ino);
+
+      if (Version <= 1)
+      {
+	 sprintf(S,"%lu",(unsigned long)Dir->d_ino);
+      }
+      else
+      {
+	 struct stat Buf;
+	 if (stat(Dir->d_name,&Buf) != 0)
+	    continue;
+	 sprintf(S,"%lu",(unsigned long)Buf.st_mtime);
+      }
+      
       Hash.Add(S);
       Hash.Add(Dir->d_name);
    };
    
-   chdir(StartDir.c_str());
+   if (chdir(StartDir.c_str()) != 0) {
+      _error->Errno("chdir",_("Unable to change to %s"),StartDir.c_str());
+      closedir(D);
+      return false;
+   }
    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");
-
-   // We use a kilobyte block size to advoid overflow
-   sprintf(S,"%u %u",Buf.f_blocks*(Buf.f_bsize/1024),
-	   Buf.f_bfree*(Buf.f_bsize/1024));
-   Hash.Add(S);
+   if (_config->FindB("Debug::identcdrom",false) == false)
+   {
+      struct statvfs Buf;
+      if (statvfs(CD.c_str(),&Buf) != 0)
+	 return _error->Errno("statfs",_("Failed to stat the cdrom"));
+
+      // We use a kilobyte block size to advoid overflow
+      if (writable_media)
+      {
+         sprintf(S,"%lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)));
+      } else {
+         sprintf(S,"%lu %lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)),
+                 (long)(Buf.f_bfree*(Buf.f_bsize/1024)));
+      }
+      Hash.Add(S);
+      sprintf(S,"-%u",Version);
+   }
+   else
+      sprintf(S,"-%u.debug",Version);
    
-   Res = Hash.Result().Value();
+   Res = Hash.Result().Value() + S;
    return true;   
 }
 									/*}}}*/
+// FindMountPointForDevice - Find mountpoint for the given device	/*{{{*/
+string FindMountPointForDevice(const char *devnode)
+{
+   // this is the order that mount uses as well
+   std::vector<std::string> const mounts = _config->FindVector("Dir::state::MountPoints", "/etc/mtab,/proc/mount");
+
+   for (std::vector<std::string>::const_iterator m = mounts.begin(); m != mounts.end(); ++m)
+      if (FileExists(*m) == true)
+      {
+	 char * line = NULL;
+	 size_t line_len = 0;
+	 FILE * f = fopen(m->c_str(), "r");
+	 while(getline(&line, &line_len, f) != -1)
+	 {
+	    char * out[] = { NULL, NULL, NULL };
+	    TokSplitString(' ', line, out, 3);
+	    if (out[2] != NULL || out[1] == NULL || out[0] == NULL)
+	       continue;
+	    if (strcmp(out[0], devnode) != 0)
+	       continue;
+	    fclose(f);
+	    // unescape the \0XXX chars in the path
+	    string mount_point = out[1];
+	    return DeEscapeString(mount_point);
+	 }
+	 fclose(f);
+      }
+
+   return string();
+}
+									/*}}}*/