/
docker.cpp
executable file
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docker.cpp
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <map>
#include <vector>
#include <stout/error.hpp>
#include <stout/foreach.hpp>
#include <stout/json.hpp>
#include <stout/lambda.hpp>
#include <stout/os.hpp>
#include <stout/path.hpp>
#include <stout/result.hpp>
#include <stout/strings.hpp>
#include <stout/stringify.hpp>
#include <stout/os/killtree.hpp>
#include <stout/os/read.hpp>
#include <stout/os/write.hpp>
#include <process/check.hpp>
#include <process/collect.hpp>
#include <process/io.hpp>
#include "common/status_utils.hpp"
#include "docker/docker.hpp"
#ifdef __linux__
#include "linux/cgroups.hpp"
#endif // __linux__
#include "slave/containerizer/mesos/isolators/cgroups/constants.hpp"
#include "slave/constants.hpp"
using namespace mesos;
using namespace mesos::internal::slave;
using namespace process;
using std::list;
using std::map;
using std::string;
using std::vector;
template <typename T>
static Future<T> failure(
const string& cmd,
int status,
const string& err)
{
return Failure(
"Failed to run '" + cmd + "': " + WSTRINGIFY(status) +
"; stderr='" + err + "'");
}
static Future<Nothing> _checkError(const string& cmd, const Subprocess& s)
{
Option<int> status = s.status().get();
if (status.isNone()) {
return Failure("No status found for '" + cmd + "'");
}
if (status.get() != 0) {
// TODO(tnachen): Consider returning stdout as well.
CHECK_SOME(s.err());
return io::read(s.err().get())
.then(lambda::bind(failure<Nothing>, cmd, status.get(), lambda::_1));
}
return Nothing();
}
// Returns a failure if no status or non-zero status returned from
// subprocess.
static Future<Nothing> checkError(const string& cmd, const Subprocess& s)
{
return s.status()
.then(lambda::bind(_checkError, cmd, s));
}
Try<Owned<Docker>> Docker::create(
const string& path,
const string& socket,
bool validate,
const Option<JSON::Object>& config)
{
if (!path::absolute(socket)) {
return Error("Invalid Docker socket path: " + socket);
}
Owned<Docker> docker(new Docker(path, socket, config));
if (!validate) {
return docker;
}
#ifdef __linux__
// Make sure that cgroups are mounted, and at least the 'cpu'
// subsystem is attached.
Result<string> hierarchy = cgroups::hierarchy("cpu");
if (hierarchy.isNone()) {
return Error("Failed to find a mounted cgroups hierarchy "
"for the 'cpu' subsystem; you probably need "
"to mount cgroups manually");
}
#endif // __linux__
Try<Nothing> validateVersion = docker->validateVersion(Version(1, 0, 0));
if (validateVersion.isError()) {
return Error(validateVersion.error());
}
return docker;
}
void commandDiscarded(const Subprocess& s, const string& cmd)
{
VLOG(1) << "'" << cmd << "' is being discarded";
os::killtree(s.pid(), SIGKILL);
}
Future<Version> Docker::version() const
{
string cmd = path + " -H " + socket + " --version";
Try<Subprocess> s = subprocess(
cmd,
Subprocess::PATH("/dev/null"),
Subprocess::PIPE(),
Subprocess::PIPE());
if (s.isError()) {
return Failure("Failed to create subprocess '" + cmd + "': " + s.error());
}
return s.get().status()
.then(lambda::bind(&Docker::_version, cmd, s.get()));
}
Future<Version> Docker::_version(const string& cmd, const Subprocess& s)
{
const Option<int>& status = s.status().get();
if (status.isNone() || status.get() != 0) {
string msg = "Failed to execute '" + cmd + "': ";
if (status.isSome()) {
msg += WSTRINGIFY(status.get());
} else {
msg += "unknown exit status";
}
return Failure(msg);
}
CHECK_SOME(s.out());
return io::read(s.out().get())
.then(lambda::bind(&Docker::__version, lambda::_1));
}
Future<Version> Docker::__version(const Future<string>& output)
{
vector<string> parts = strings::split(output.get(), ",");
if (!parts.empty()) {
vector<string> subParts = strings::split(parts.front(), " ");
if (!subParts.empty()) {
// Docker version output in Fedora 22 is "x.x.x.fc22" which does not match
// the Semantic Versioning specification(<major>[.<minor>[.<patch>]]). We
// remove the overflow components here before parsing the docker version
// output to a Version struct.
string versionString = subParts.back();
vector<string> components = strings::split(versionString, ".");
if (components.size() > 3) {
components.erase(components.begin() + 3, components.end());
}
versionString = strings::join(".", components);
Try<Version> version = Version::parse(versionString);
if (version.isError()) {
return Failure("Failed to parse docker version: " +
version.error());
}
return version;
}
}
return Failure("Unable to find docker version in output");
}
Try<Nothing> Docker::validateVersion(const Version& minVersion) const
{
// Validate the version (and that we can use Docker at all).
Future<Version> version = this->version();
if (!version.await(DOCKER_VERSION_WAIT_TIMEOUT)) {
return Error("Timed out getting docker version");
}
if (version.isFailed()) {
return Error("Failed to get docker version: " + version.failure());
}
if (version.get() < minVersion) {
string msg = "Insufficient version '" + stringify(version.get()) +
"' of Docker. Please upgrade to >=' " +
stringify(minVersion) + "'";
return Error(msg);
}
return Nothing();
}
// TODO(josephw): Parse this string with a protobuf.
Try<Docker::Container> Docker::Container::create(const string& output)
{
Try<JSON::Array> parse = JSON::parse<JSON::Array>(output);
if (parse.isError()) {
return Error("Failed to parse JSON: " + parse.error());
}
// TODO(benh): Handle the case where the short container ID was
// not sufficiently unique and 'array.values.size() > 1'.
JSON::Array array = parse.get();
if (array.values.size() != 1) {
return Error("Failed to find container");
}
CHECK(array.values.front().is<JSON::Object>());
JSON::Object json = array.values.front().as<JSON::Object>();
Result<JSON::String> idValue = json.find<JSON::String>("Id");
if (idValue.isNone()) {
return Error("Unable to find Id in container");
} else if (idValue.isError()) {
return Error("Error finding Id in container: " + idValue.error());
}
string id = idValue.get().value;
Result<JSON::String> nameValue = json.find<JSON::String>("Name");
if (nameValue.isNone()) {
return Error("Unable to find Name in container");
} else if (nameValue.isError()) {
return Error("Error finding Name in container: " + nameValue.error());
}
string name = nameValue.get().value;
Result<JSON::Object> stateValue = json.find<JSON::Object>("State");
if (stateValue.isNone()) {
return Error("Unable to find State in container");
} else if (stateValue.isError()) {
return Error("Error finding State in container: " + stateValue.error());
}
Result<JSON::Number> pidValue = stateValue.get().find<JSON::Number>("Pid");
if (pidValue.isNone()) {
return Error("Unable to find Pid in State");
} else if (pidValue.isError()) {
return Error("Error finding Pid in State: " + pidValue.error());
}
pid_t pid = pid_t(pidValue.get().as<int64_t>());
Option<pid_t> optionalPid;
if (pid != 0) {
optionalPid = pid;
}
Result<JSON::String> startedAtValue =
stateValue.get().find<JSON::String>("StartedAt");
if (startedAtValue.isNone()) {
return Error("Unable to find StartedAt in State");
} else if (startedAtValue.isError()) {
return Error("Error finding StartedAt in State: " + startedAtValue.error());
}
bool started = startedAtValue.get().value != "0001-01-01T00:00:00Z";
Option<string> ipAddress;
bool findDeprecatedIP = false;
Result<JSON::String> networkMode =
json.find<JSON::String>("HostConfig.NetworkMode");
if (!networkMode.isSome()) {
// We need to fail back to the old field as Docker added NetworkMode
// since Docker remote API 1.15.
VLOG(1) << "Unable to detect HostConfig.NetworkMode, "
<< "attempting deprecated IP field";
findDeprecatedIP = true;
} else {
// We currently rely on the fact that we always set --net when
// we shell out to docker run, and therefore the network mode
// matches what --net is. Without --net, the network mode would be set
// to 'default' and we won't be able to find the IP address as
// it will be in 'Networks.bridge' key.
string addressLocation = "NetworkSettings.Networks." +
networkMode->value + ".IPAddress";
Result<JSON::String> ipAddressValue =
json.find<JSON::String>(addressLocation);
if (!ipAddressValue.isSome()) {
// We also need to failback to the old field as the IP Address
// field location also changed since Docker remote API 1.20.
VLOG(1) << "Unable to detect IP Address at '" << addressLocation << "',"
<< " attempting deprecated field";
findDeprecatedIP = true;
} else if (!ipAddressValue->value.empty()) {
ipAddress = ipAddressValue->value;
}
}
if (findDeprecatedIP) {
Result<JSON::String> ipAddressValue =
json.find<JSON::String>("NetworkSettings.IPAddress");
if (ipAddressValue.isNone()) {
return Error("Unable to find NetworkSettings.IPAddress in container");
} else if (ipAddressValue.isError()) {
return Error(
"Error finding NetworkSettings.IPAddress in container: " +
ipAddressValue.error());
} else if (!ipAddressValue->value.empty()) {
ipAddress = ipAddressValue->value;
}
}
vector<Device> devices;
Result<JSON::Array> devicesArray =
json.find<JSON::Array>("HostConfig.Devices");
if (devicesArray.isError()) {
return Error("Failed to parse HostConfig.Devices: " + devicesArray.error());
}
if (devicesArray.isSome()) {
foreach (const JSON::Value& entry, devicesArray->values) {
if (!entry.is<JSON::Object>()) {
return Error("Malformed HostConfig.Devices"
" entry '" + stringify(entry) + "'");
}
JSON::Object object = entry.as<JSON::Object>();
Result<JSON::String> hostPath =
object.at<JSON::String>("PathOnHost");
Result<JSON::String> containerPath =
object.at<JSON::String>("PathInContainer");
Result<JSON::String> permissions =
object.at<JSON::String>("CgroupPermissions");
if (!hostPath.isSome() ||
!containerPath.isSome() ||
!permissions.isSome()) {
return Error("Malformed HostConfig.Devices entry"
" '" + stringify(object) + "'");
}
Device device;
device.hostPath = Path(hostPath->value);
device.containerPath = Path(containerPath->value);
device.access.read = strings::contains(permissions->value, "r");
device.access.write = strings::contains(permissions->value, "w");
device.access.mknod = strings::contains(permissions->value, "m");
devices.push_back(device);
}
}
return Container(output, id, name, optionalPid, started, ipAddress, devices);
}
Try<Docker::Image> Docker::Image::create(const JSON::Object& json)
{
Result<JSON::Value> entrypoint =
json.find<JSON::Value>("ContainerConfig.Entrypoint");
if (entrypoint.isError()) {
return Error("Failed to find 'ContainerConfig.Entrypoint': " +
entrypoint.error());
} else if (entrypoint.isNone()) {
return Error("Unable to find 'ContainerConfig.Entrypoint'");
}
Option<vector<string>> entrypointOption = None();
if (!entrypoint.get().is<JSON::Null>()) {
if (!entrypoint.get().is<JSON::Array>()) {
return Error("Unexpected type found for 'ContainerConfig.Entrypoint'");
}
const vector<JSON::Value>& values =
entrypoint.get().as<JSON::Array>().values;
if (values.size() != 0) {
vector<string> result;
foreach (const JSON::Value& value, values) {
if (!value.is<JSON::String>()) {
return Error("Expecting entrypoint value to be type string");
}
result.push_back(value.as<JSON::String>().value);
}
entrypointOption = result;
}
}
Result<JSON::Value> env =
json.find<JSON::Value>("ContainerConfig.Env");
if (env.isError()) {
return Error("Failed to find 'ContainerConfig.Env': " +
env.error());
} else if (env.isNone()) {
return Error("Unable to find 'ContainerConfig.Env'");
}
Option<map<string, string>> envOption = None();
if (!env.get().is<JSON::Null>()) {
if (!env.get().is<JSON::Array>()) {
return Error("Unexpected type found for 'ContainerConfig.Env'");
}
const vector<JSON::Value>& values = env.get().as<JSON::Array>().values;
if (values.size() != 0) {
map<string, string> result;
foreach (const JSON::Value& value, values) {
if (!value.is<JSON::String>()) {
return Error("Expecting environment value to be type string");
}
const vector<string> tokens =
strings::split(value.as<JSON::String>().value, "=", 2);
if (tokens.size() != 2) {
return Error("Unexpected Env format for 'ContainerConfig.Env'");
}
if (result.count(tokens[0]) > 0) {
return Error("Unexpected duplicate environment variables '"
+ tokens[0] + "'");
}
result[tokens[0]] = tokens[1];
}
envOption = result;
}
}
return Docker::Image(entrypointOption, envOption);
}
Future<Option<int>> Docker::run(
const ContainerInfo& containerInfo,
const CommandInfo& commandInfo,
const string& name,
const string& sandboxDirectory,
const string& mappedDirectory,
const Option<Resources>& resources,
const Option<map<string, string>>& env,
const Option<vector<Device>>& devices,
const process::Subprocess::IO& _stdout,
const process::Subprocess::IO& _stderr) const
{
if (!containerInfo.has_docker()) {
return Failure("No docker info found in container info");
}
const ContainerInfo::DockerInfo& dockerInfo = containerInfo.docker();
vector<string> argv;
argv.push_back(path);
argv.push_back("-H");
argv.push_back(socket);
argv.push_back("run");
if (dockerInfo.privileged()) {
argv.push_back("--privileged");
}
if (resources.isSome()) {
// TODO(yifan): Support other resources (e.g. disk).
Option<double> cpus = resources.get().cpus();
if (cpus.isSome()) {
uint64_t cpuShare =
std::max((uint64_t) (CPU_SHARES_PER_CPU * cpus.get()), MIN_CPU_SHARES);
argv.push_back("--cpu-shares");
argv.push_back(stringify(cpuShare));
}
Option<Bytes> mem = resources.get().mem();
if (mem.isSome()) {
Bytes memLimit = std::max(mem.get(), MIN_MEMORY);
argv.push_back("--memory");
argv.push_back(stringify(memLimit.bytes()));
}
}
string environmentVariables;
if (env.isSome()) {
foreachpair (const string& key, const string& value, env.get()) {
environmentVariables += key + "=" + value + "\n";
}
}
foreach (const Environment::Variable& variable,
commandInfo.environment().variables()) {
if (env.isSome() &&
env.get().find(variable.name()) != env.get().end()) {
// Skip to avoid duplicate environment variables.
continue;
}
environmentVariables += variable.name() + "=" + variable.value() + "\n";
}
environmentVariables += "MESOS_SANDBOX=" + mappedDirectory + "\n";
environmentVariables += "MESOS_CONTAINER_NAME=" + name + "\n";
Try<string> environmentFile_ = os::mktemp();
if (environmentFile_.isError()) {
return Failure("Failed to create temporary docker environment "
"file: " + environmentFile_.error());
}
const string& environmentFile = environmentFile_.get();
Try<int_fd> fd = os::open(
environmentFile,
O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR);
if (fd.isError()) {
return Failure(
"Failed to open file '" + environmentFile + "': " + fd.error());
}
Try<Nothing> write = os::write(fd.get(), environmentVariables);
os::close(fd.get());
if (write.isError()) {
return Failure(
"Failed to write docker environment file to '" + environmentFile +
"': " + write.error());
}
argv.push_back("--env-file");
argv.push_back(environmentFile);
Option<string> volumeDriver;
foreach (const Volume& volume, containerInfo.volumes()) {
// The 'container_path' can be either an absolute path or a
// relative path. If it is a relative path, it would be prefixed
// with the container sandbox directory.
string volumeConfig = path::absolute(volume.container_path())
? volume.container_path()
: path::join(mappedDirectory, volume.container_path());
// TODO(gyliu513): Set `host_path` as source.
if (volume.has_host_path()) {
// If both 'host_path' and 'container_path' are relative paths,
// return a failure because the user can just directly access the
// volume in the sandbox.
if (!path::absolute(volume.host_path()) &&
!path::absolute(volume.container_path())) {
return Failure(
"Both host_path '" + volume.host_path() + "' " +
"and container_path '" + volume.container_path() + "' " +
"of a volume are relative");
}
if (!path::absolute(volume.host_path()) &&
!dockerInfo.has_volume_driver()) {
// When volume driver is empty and host path is a relative path, mapping
// host path from the sandbox.
volumeConfig =
path::join(sandboxDirectory, volume.host_path()) + ":" + volumeConfig;
} else {
volumeConfig = volume.host_path() + ":" + volumeConfig;
}
switch (volume.mode()) {
case Volume::RW: volumeConfig += ":rw"; break;
case Volume::RO: volumeConfig += ":ro"; break;
default: return Failure("Unsupported volume mode");
}
} else if (volume.has_source()) {
if (volume.source().type() != Volume::Source::DOCKER_VOLUME) {
VLOG(1) << "Ignored volume type '" << volume.source().type()
<< "' for container '" << name << "' as only "
<< "'DOCKER_VOLUME' was supported by docker";
continue;
}
volumeConfig = volume.source().docker_volume().name() +
":" + volumeConfig;
if (volume.source().docker_volume().has_driver()) {
const string& currentDriver = volume.source().docker_volume().driver();
if (volumeDriver.isSome() &&
volumeDriver.get() != currentDriver) {
return Failure("Only one volume driver is supported");
}
volumeDriver = currentDriver;
}
switch (volume.mode()) {
case Volume::RW: volumeConfig += ":rw"; break;
case Volume::RO: volumeConfig += ":ro"; break;
default: return Failure("Unsupported volume mode");
}
} else {
return Failure("Host path or volume source is required");
}
argv.push_back("-v");
argv.push_back(volumeConfig);
}
// Mapping sandbox directory into the container mapped directory.
argv.push_back("-v");
argv.push_back(sandboxDirectory + ":" + mappedDirectory);
// TODO(gyliu513): Deprecate this after the release cycle of 1.0.
// It will be replaced by Volume.Source.DockerVolume.driver.
if (dockerInfo.has_volume_driver()) {
if (volumeDriver.isSome() &&
volumeDriver.get() != dockerInfo.volume_driver()) {
return Failure("Only one volume driver per task is supported");
}
volumeDriver = dockerInfo.volume_driver();
}
if (volumeDriver.isSome()) {
argv.push_back("--volume-driver=" + volumeDriver.get());
}
const string& image = dockerInfo.image();
argv.push_back("--net");
string network;
switch (dockerInfo.network()) {
case ContainerInfo::DockerInfo::HOST: network = "host"; break;
case ContainerInfo::DockerInfo::BRIDGE: network = "bridge"; break;
case ContainerInfo::DockerInfo::NONE: network = "none"; break;
case ContainerInfo::DockerInfo::USER: {
// User defined networks require docker version >= 1.9.0.
Try<Nothing> validateVer = validateVersion(Version(1, 9, 0));
if (validateVer.isError()) {
return Failure("User defined networks require Docker "
"version 1.9.0 or higher");
}
if (containerInfo.network_infos_size() == 0) {
return Failure("No network info found in container info");
}
if (containerInfo.network_infos_size() > 1) {
return Failure("Only a single network can be defined in Docker run");
}
const NetworkInfo& networkInfo = containerInfo.network_infos(0);
if(!networkInfo.has_name()){
return Failure("No network name found in network info");
}
network = networkInfo.name();
break;
}
default: return Failure("Unsupported Network mode: " +
stringify(dockerInfo.network()));
}
argv.push_back(network);
if (containerInfo.has_hostname()) {
if (network == "host") {
return Failure("Unable to set hostname with host network mode");
}
argv.push_back("--hostname");
argv.push_back(containerInfo.hostname());
}
foreach (const Parameter& parameter, dockerInfo.parameters()) {
argv.push_back("--" + parameter.key() + "=" + parameter.value());
}
if (dockerInfo.port_mappings().size() > 0) {
if (network == "host" || network == "none") {
return Failure("Port mappings are only supported for bridge and "
"user-defined networks");
}
if (!resources.isSome()) {
return Failure("Port mappings require resources");
}
Option<Value::Ranges> portRanges = resources.get().ports();
if (!portRanges.isSome()) {
return Failure("Port mappings require port resources");
}
foreach (const ContainerInfo::DockerInfo::PortMapping& mapping,
dockerInfo.port_mappings()) {
bool found = false;
foreach (const Value::Range& range, portRanges.get().range()) {
if (mapping.host_port() >= range.begin() &&
mapping.host_port() <= range.end()) {
found = true;
break;
}
}
if (!found) {
return Failure("Port [" + stringify(mapping.host_port()) + "] not " +
"included in resources");
}
string portMapping = stringify(mapping.host_port()) + ":" +
stringify(mapping.container_port());
if (mapping.has_protocol()) {
portMapping += "/" + strings::lower(mapping.protocol());
}
argv.push_back("-p");
argv.push_back(portMapping);
}
}
if (devices.isSome()) {
foreach (const Device& device, devices.get()) {
if (!device.hostPath.absolute()) {
return Failure("Device path '" + device.hostPath.string() + "'"
" is not an absolute path");
}
string permissions;
permissions += device.access.read ? "r" : "";
permissions += device.access.write ? "w" : "";
permissions += device.access.mknod ? "m" : "";
// Docker doesn't handle this case (it fails by saying
// that an absolute path is not being provided).
if (permissions.empty()) {
return Failure("At least one access required for --devices:"
" none specified for"
" '" + device.hostPath.string() + "'");
}
// Note that docker silently does not handle default devices
// passed in with restricted permissions (e.g. /dev/null), so
// we don't bother checking this case either.
argv.push_back("--device=" +
device.hostPath.string() + ":" +
device.containerPath.string() + ":" +
permissions);
}
}
if (commandInfo.shell()) {
// We override the entrypoint if shell is enabled because we
// assume the user intends to run the command within a shell
// and not the default entrypoint of the image. View MESOS-1770
// for more details.
argv.push_back("--entrypoint");
#ifdef __WINDOWS__
argv.push_back("cmd");
#else
argv.push_back("/bin/sh");
#endif // __WINDOWS__
}
argv.push_back("--name");
argv.push_back(name);
argv.push_back(image);
if (commandInfo.shell()) {
if (!commandInfo.has_value()) {
return Failure("Shell specified but no command value provided");
}
// The Docker CLI only supports a single word for overriding the
// entrypoint, so we must specify `-c` (or `/c` on Windows)
// for the other parts of the command.
#ifdef __WINDOWS__
argv.push_back("/c");
#else
argv.push_back("-c");
#endif // __WINDOWS__
argv.push_back(commandInfo.value());
} else {
if (commandInfo.has_value()) {
argv.push_back(commandInfo.value());
}
foreach (const string& argument, commandInfo.arguments()) {
argv.push_back(argument);
}
}
string cmd = strings::join(" ", argv);
LOG(INFO) << "Running " << cmd;
map<string, string> environment = os::environment();
// NOTE: This is non-relevant to pick up a docker config file,
// which is necessary for private registry.
environment["HOME"] = sandboxDirectory;
Try<Subprocess> s = subprocess(
path,
argv,
Subprocess::PATH("/dev/null"),
_stdout,
_stderr,
nullptr,
environment);
if (s.isError()) {
return Failure("Failed to create subprocess '" + cmd + "': " + s.error());
}
s->status()
.onDiscard(lambda::bind(&commandDiscarded, s.get(), cmd))
.onAny([environmentFile]() {
Try<Nothing> rm = os::rm(environmentFile);
if (rm.isError()) {
LOG(WARNING) << "Failed to remove temporary docker environment file "
<< "'" << environmentFile << "': " << rm.error();
}
});
// Ideally we could capture the stderr when docker itself fails,
// however due to the stderr redirection used here we cannot.
//
// TODO(bmahler): Determine a way to redirect stderr while still
// capturing the stderr when 'docker run' itself fails. E.g. we
// could use 'docker logs' in conjuction with a "detached" form
// of 'docker run' to isolate 'docker run' failure messages from
// the container stderr.
return s->status();
}
Future<Nothing> Docker::stop(
const string& containerName,
const Duration& timeout,
bool remove) const
{
int timeoutSecs = (int) timeout.secs();
if (timeoutSecs < 0) {
return Failure("A negative timeout cannot be applied to docker stop: " +
stringify(timeoutSecs));
}
string cmd = path + " -H " + socket + " stop -t " + stringify(timeoutSecs) +
" " + containerName;
VLOG(1) << "Running " << cmd;
Try<Subprocess> s = subprocess(
cmd,
Subprocess::PATH("/dev/null"),
Subprocess::PATH("/dev/null"),
Subprocess::PIPE());
if (s.isError()) {
return Failure("Failed to create subprocess '" + cmd + "': " + s.error());
}
return s.get().status()
.then(lambda::bind(
&Docker::_stop,
*this,
containerName,
cmd,
s.get(),
remove));
}
Future<Nothing> Docker::_stop(
const Docker& docker,
const string& containerName,
const string& cmd,
const Subprocess& s,
bool remove)
{
Option<int> status = s.status().get();
if (remove) {
bool force = !status.isSome() || status.get() != 0;
return docker.rm(containerName, force);
}
return checkError(cmd, s);
}
Future<Nothing> Docker::kill(
const string& containerName,
int signal) const
{
const string cmd =
path + " -H " + socket +
" kill --signal=" + stringify(signal) + " " + containerName;
VLOG(1) << "Running " << cmd;
Try<Subprocess> s = subprocess(
cmd,
Subprocess::PATH("/dev/null"),
Subprocess::PATH("/dev/null"),
Subprocess::PIPE());
if (s.isError()) {
return Failure("Failed to create subprocess '" + cmd + "': " + s.error());
}
return checkError(cmd, s.get());
}
Future<Nothing> Docker::rm(
const string& containerName,
bool force) const
{
// The `-v` flag removes Docker volumes that may be present.
const string cmd =
path + " -H " + socket +
(force ? " rm -f -v " : " rm -v ") + containerName;
VLOG(1) << "Running " << cmd;
Try<Subprocess> s = subprocess(
cmd,
Subprocess::PATH("/dev/null"),
Subprocess::PATH("/dev/null"),
Subprocess::PIPE());
if (s.isError()) {
return Failure("Failed to create subprocess '" + cmd + "': " + s.error());
}
return checkError(cmd, s.get());
}
Future<Docker::Container> Docker::inspect(
const string& containerName,
const Option<Duration>& retryInterval) const
{