X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/4df0b629aca0431f88248ce2e17702ff42367ca1..a0e07f3ec885c12c733c12805391646c202f3f31:/apt-pkg/contrib/cdromutl.cc diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc index 47eb3efc2..9de795b60 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. @@ -10,29 +10,33 @@ ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ -#ifdef __GNUG__ -#pragma implementation "apt-pkg/cdromutl.h" -#endif +#include + #include #include #include #include +#include +#include #include -#include -#include +#include #include #include #include #include #include + +#include /*}}}*/ -// UnmountCdrom - Unmount a cdrom /*{{{*/ +// 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; @@ -47,103 +51,134 @@ bool UnmountCdrom(string Path) 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) +{ + if (IsMounted(Path) == 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); + + 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, we assume that the reader order will never change as the media is read-only. In theory if the kernel did @@ -155,26 +190,86 @@ 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) +{ + 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(); +} + /*}}}*/