// -*- 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 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 <sys/statvfs.h>
#include <dirent.h>
#include <fcntl.h>
+#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
+
+#include <apti18n.h>
/*}}}*/
+using std::string;
+
+// 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;
- // 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);
+
+ int Child = ExecFork();
- const char *Args[10];
- Args[0] = "umount";
- Args[1] = Path.c_str();
- Args[2] = 0;
- execvp(Args[0],(char **)Args);
- exit(100);
- }
+ // The child
+ if (Child == 0)
+ {
+ // Make all the fds /dev/null
+ for (int I = 0; I != 3; I++)
+ dup2(open("/dev/null",O_RDWR),I);
- // 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");
+ 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");
+ 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";
+ 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
+ /* 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);
};
- 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");
-
- 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
+ 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)
+{
+ char buf[255];
+ char *out[10];
+ int i=0;
+
+ // this is the order that mount uses as well
+ const char *mount[] = { "/etc/mtab",
+ "/proc/mount",
+ NULL };
+
+ for (i=0; mount[i] != NULL; i++) {
+ if (FileExists(mount[i])) {
+ FILE *f=fopen(mount[i], "r");
+ while ( fgets(buf, sizeof(buf), f) != NULL) {
+ if (strncmp(buf, devnode, strlen(devnode)) == 0) {
+ if(TokSplitString(' ', buf, out, 10))
+ {
+ fclose(f);
+ // unescape the \0XXX chars in the path
+ string mount_point = out[1];
+ return DeEscapeString(mount_point);
+ }
+ }
+ }
+ fclose(f);
+ }
+ }
+
+ return string();
+}
+ /*}}}*/
projects / apt.git / blobdiff