diff options
Diffstat (limited to 'apt-pkg/contrib/cdromutl.cc')
| -rw-r--r-- | apt-pkg/contrib/cdromutl.cc | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc index 58dff94d..47eb3efc 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 1.1 1998/11/29 01:19:27 jgg Exp $ +// $Id: cdromutl.cc,v 1.2 1999/03/28 01:37:26 jgg Exp $ /* ###################################################################### CDROM Utilities - Some functions to manipulate CDROM mounts. @@ -23,6 +23,7 @@ #include <sys/vfs.h> #include <dirent.h> #include <fcntl.h> +#include <sys/stat.h> #include <unistd.h> #include <stdio.h> /*}}}*/ @@ -33,6 +34,24 @@ leave /etc/mtab inconsitant. We drop all messages this produces. */ bool UnmountCdrom(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 true; + int Child = fork(); if (Child < -1) return _error->Errno("fork","Failed to fork"); @@ -126,7 +145,9 @@ bool IdentCdrom(string CD,string &Res) if (D == 0) 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)) { @@ -147,8 +168,10 @@ bool IdentCdrom(string CD,string &Res) 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); + + // 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); Res = Hash.Result().Value(); |