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// Copyright © 2011, 2014-17 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 "Backup.h"
#include "Volume.h"
#include "Host.h"
#include "Subprocess.h"
#include <cstdio>
#include <cstdarg>
#include <ostream>
Host::~Host() {
for(auto &v: volumes)
delete v.second;
}
void Host::select(bool sense) {
for(auto &v: volumes)
v.second->select(sense);
}
bool Host::selected() const {
for(auto &v: volumes)
if(v.second->selected())
return true;
return false;
}
bool Host::valid(const std::string &name) {
return name.size() > 0
&& name.at(0) != '-'
&& name.find_first_not_of(HOST_VALID) == std::string::npos;
}
void Host::addVolume(Volume *v) {
volumes[v->name] = v;
}
Volume *Host::findVolume(const std::string &volumeName) const {
auto it = volumes.find(volumeName);
return it != volumes.end() ? it->second : nullptr;
}
std::string Host::userAndHost() const {
return (user.size()
? user + "@" + hostname
: hostname);
}
std::string Host::sshPrefix() const {
std::string s = userAndHost();
return s == "localhost" ? "" : s + ":";
}
bool Host::available() const {
// localhost is always available
if(hostname == "localhost")
return true;
if(hostCheck.at(0) == "always-up")
return true;
if(hostCheck.at(0) == "ssh")
return invoke(nullptr, "true", (const char *)nullptr) == 0;
if(hostCheck.at(0) == "command") {
std::vector<std::string> args(hostCheck.begin() + 1, hostCheck.end());
args.push_back(hostname);
Subprocess sp(args);
return sp.runAndWait(Subprocess::THROW_ON_CRASH
|Subprocess::THROW_ON_SIGPIPE) == 0;
}
// Configuration parser should stop us getting here
throw std::logic_error("invalid host-check for " + name);
}
void Host::write(std::ostream &os, int step, bool verbose) const {
describe_type *d = verbose ? describe : nodescribe;
os << indent(step) << "host " << quote(name) << '\n';
step += 4;
ConfBase::write(os, step, verbose);
d(os, "", step);
d(os, "# Concurrency group", step);
d(os, "# group NAME", step);
if(group != name)
os << indent(step) << "group " << quote(group) << '\n';
d(os, "", step);
d(os, "# Hostname for SSH", step);
d(os, "# hostname NAME", step);
os << indent(step) << "hostname " << quote(hostname) << '\n';
d(os, "", step);
d(os, "# Username for SSH; default is not to supply a username", step);
d(os, "# user NAME", step);
if(user.size())
os << indent(step) << "user " << quote(user) << '\n';
d(os, "", step);
if(alwaysUp) {
d(os, "# Treat host being down as an error", step);
d(os, "# always-up true|false", step);
os << indent(step) << "always-up " << (alwaysUp ? "true" : "false") << '\n';
d(os, "", step);
}
d(os, "# Glob pattern for devices this host will be backed up to", step);
d(os, "# devices PATTERN", step);
if(devicePattern.size())
os << indent(step) << "devices " << quote(devicePattern) << '\n';
d(os, "", step);
d(os,
"# Priority for this host (higher priority = backed up earlier)",
step);
d(os, "# priority INTEGER", step);
os << indent(step) << "priority " << priority << '\n';
for(auto &v: volumes) {
os << '\n';
v.second->write(os, step, verbose);
}
}
int Host::invoke(std::string *capture,
const char *cmd, ...) const {
std::vector<std::string> args;
const char *arg;
va_list ap;
if(hostname != "localhost") {
args.push_back("ssh");
if(sshTimeout > 0) {
char buffer[64];
snprintf(buffer, sizeof buffer, "%d", sshTimeout);
args.push_back(std::string("-oConnectTimeout=") + buffer);
}
args.push_back(userAndHost());
}
args.push_back(cmd);
va_start(ap, cmd);
while((arg = va_arg(ap, const char *)))
args.push_back(arg);
va_end(ap);
Subprocess sp(args);
if(capture) {
sp.capture(1, capture);
return sp.runAndWait(Subprocess::THROW_ON_ERROR
|Subprocess::THROW_ON_CRASH);
} else {
sp.nullChildFD(1);
sp.nullChildFD(2);
return sp.runAndWait(Subprocess::THROW_ON_CRASH);
}
}
ConfBase *Host::getParent() const {
return parent;
}
std::string Host::what() const {
return "host";
}
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