// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: cdromutl.cc,v 1.1 1998/11/29 01:19:27 jgg Exp $
+// $Id: cdromutl.cc,v 1.12 2001/02/20 07:03:17 jgg Exp $
/* ######################################################################
CDROM Utilities - Some functions to manipulate CDROM mounts.
#include <apt-pkg/error.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/fileutl.h>
+#include <apt-pkg/configuration.h>
+#include <apti18n.h>
+
#include <sys/wait.h>
#include <sys/errno.h>
-#include <sys/vfs.h>
+#include <sys/statvfs.h>
#include <dirent.h>
#include <fcntl.h>
+#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
/*}}}*/
+// IsMounted - Returns true if the mount point is mounted /*{{{*/
+// ---------------------------------------------------------------------
+/* 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!)
+ 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());
+
+ 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)
{
- int Child = fork();
- if (Child < -1)
- return _error->Errno("fork","Failed to fork");
+ if (IsMounted(Path) == false)
+ 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] = "umount";
- Args[1] = Path.c_str();
- Args[2] = 0;
- execvp(Args[0],(char **)Args);
- exit(100);
+ 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);
+ }
}
// 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,"umount",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");
+ if (IsMounted(Path) == 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);
+ 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";
+ 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;
+ 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;
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
+ /* 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
+ some sort of wacked caching this might not be true.. */
char S[300];
for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
{
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);
};
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);
+ 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
+ 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;
}
/*}}}*/
projects / apt.git / blobdiff