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// Copyright © 2011-13, 2015-18 Richard Kettlewell.
//
// This program 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.
//
// This program 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 "Conf.h"
#include "Store.h"
#include "Device.h"
#include "Errors.h"
#include "IO.h"
#include "Utils.h"
#include "DeviceAccess.h"
#include <cerrno>
#include <sys/types.h>
#include <sys/stat.h>
// Identify the device on this store, if any
void Store::identify() {
IO *f = nullptr;
try {
struct stat sb;
if(device)
return; // already identified
if(stat(path.c_str(), &sb) < 0)
throw BadStore("store '" + path + "' does not exist");
if(mounted) {
const std::string parent_path = path + "/..";
struct stat parent_sb;
if(stat(parent_path.c_str(), &parent_sb) < 0)
throw FatalStoreError("cannot stat '" + parent_path);
if(sb.st_dev == parent_sb.st_dev)
throw UnavailableStore("store '" + path + "' is not mounted");
}
// Make sure backup devices are mounted
preDeviceAccess();
// Read the device name
f = new IO();
f->open(path + PATH_SEP + "device-id", "r");
std::string deviceName;
if(!f->readline(deviceName))
throw BadStore("store '" + path + "' has a malformed device-id");
// See if it exists
auto devices_iterator = config.devices.find(deviceName);
if(devices_iterator == config.devices.end())
throw BadStore("store '" + path
+ "' has unknown device-id '" + deviceName + "'");
Device *foundDevice = devices_iterator->second;
// Duplicates are bad, sufficiently so that we don't treat it as
// just an unsuitable store; something is seriously wrong and it
// needs immediate attention.
if(foundDevice->store)
throw FatalStoreError("store '" + path
+ "' has duplicate device-id '" + deviceName
+ "', also found on store '" + foundDevice->store->path
+ "'");
if(!config.publicStores) {
// Verify permissions
if(sb.st_uid)
throw BadStore("store '" + path + "' not owned by root");
if(sb.st_mode & 077)
throw BadStore("store '" + path + "' is not private");
}
device = foundDevice;
device->store = this;
// On success, leave a file open on the store to stop it being unmounted
// while we it's a potential destination for backups; but close it before
// unmounting.
closeOnUnmount(f);
} catch(IOError &e) {
// Re-throw with the appropriate error type
if(e.errno_value == ENOENT)
throw UnavailableStore(e.what());
else
throw BadStore(e.what());
} catch(...) {
delete f;
throw;
}
}
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