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/* Copyright © 2003,2006-2008 Roger Leigh <rleigh@debian.org>
*
* schroot is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* schroot is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
*********************************************************************/
#include <config.h>
#include "sbuild-mntstream.h"
#include <cerrno>
#include <cstring>
using namespace sbuild;
namespace
{
typedef std::pair<mntstream::error_code,const char *> emap;
/**
* This is a list of the supported error codes. It's used to
* construct the real error codes map.
*/
emap init_errors[] =
{
// TRANSLATORS: %1% = mount file name
emap(mntstream::MNT_OPEN, N_("Failed to open mount file '%1%'")),
// TRANSLATORS: %1% = mount file name
emap(mntstream::MNT_READ, N_("Failed to read mount file '%1%'"))
};
}
template<>
error<mntstream::error_code>::map_type
error<mntstream::error_code>::error_strings
(init_errors,
init_errors + (sizeof(init_errors) / sizeof(init_errors[0])));
mntstream::mntentry::mntentry (struct mntent const& entry):
filesystem_name(entry.mnt_fsname),
directory(entry.mnt_dir),
type(entry.mnt_type),
options(entry.mnt_opts),
dump_frequency(entry.mnt_freq),
fsck_pass(entry.mnt_passno)
{
}
mntstream::mntstream(std::string const& file):
file(),
mntfile(0),
data(),
error_status(true),
eof_status(true)
{
open(file);
}
mntstream::~mntstream()
{
close();
}
void
mntstream::open(std::string const& file)
{
this->mntfile = setmntent(file.c_str(), "r");
if (this->mntfile == 0)
{
this->file.clear();
this->error_status = true;
this->eof_status = true;
throw error(file, MNT_OPEN, strerror(errno));
}
this->file = file;
this->error_status = false;
this->eof_status = false;
read();
}
void
mntstream::read(int quantity)
{
int i;
if (this->mntfile == 0)
return;
for (i = 0; i < quantity; ++i)
{
struct mntent* entry;
errno = 0;
entry = getmntent(mntfile);
if (entry == 0) // EOF or error
{
//std::cerr << "Mount file read error: ";
if (errno) // error
{
this->error_status = true;
throw error(this->file, MNT_READ, strerror(errno));
}
return;
}
mntentry newentry(*entry); // make a mntentry
this->data.push_back(newentry); // push onto the end of the list
}
}
void
mntstream::close()
{
if (this->mntfile)
endmntent(this->mntfile); // don't throw an exception on failure
// -- it could be called in the
// destructor
this->mntfile = 0;
this->data.clear(); // clear all data
this->file.clear();
this->error_status = true;
this->eof_status = true;
}
bool
mntstream::eof() const
{
return this->eof_status;
}
bool
mntstream::bad() const
{
return this->error_status;
}
mntstream::operator bool ()
{
return !(bad() || eof());
}
bool
mntstream::operator ! ()
{
return bad() || eof();
}
mntstream&
sbuild::operator >> (mntstream& stream,
mntstream::mntentry& entry)
{
stream.read(); // read a new entry
if (stream && !stream.data.empty()) // not at end of file or bad.
{
entry = stream.data.front(); // assign next mntentry to entry
stream.data.pop_front(); // remove the entry
}
else // blank the mntentry and set EOF status
{
entry = mntstream::mntentry();
stream.eof_status = true;
}
return stream;
}
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