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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed 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.
#ifndef BAZEL_SRC_MAIN_CPP_STARTUP_OPTIONS_H_
#define BAZEL_SRC_MAIN_CPP_STARTUP_OPTIONS_H_
#if defined(__APPLE__)
#include <sys/qos.h>
#endif
#include <functional>
#include <map>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "src/main/cpp/util/exit_code.h"
#include "src/main/cpp/util/path.h"
namespace blaze {
class WorkspaceLayout;
// A startup flag tagged with its origin, either an rc file or the empty
// string for the ones specified in the command line.
// For instance, RcStartupFlag("somepath/.bazelrc", "--foo") is used to
// represent that the line "startup --foo" was found when parsing
// "somepath/.bazelrc".
struct RcStartupFlag {
const std::string source;
const std::string value;
RcStartupFlag(const std::string& source_arg,
const std::string& value_arg)
: source(source_arg), value(value_arg) {}
};
// This class defines the startup options accepted by all versions Bazel, and
// holds the parsed values. These options and their defaults must be kept in
// sync with those in
// src/main/java/com/google/devtools/build/lib/runtime/BlazeServerStartupOptions.java.
// The latter are (usually) purely decorative (they affect the help message,
// which displays the defaults). The actual defaults are defined
// in the constructor.
//
// Note that this class is not thread-safe.
//
// TODO(bazel-team): The encapsulation is not quite right -- there are some
// places in blaze.cc where some of these fields are explicitly modified. Their
// names also don't conform to the style guide.
class StartupOptions {
public:
virtual ~StartupOptions();
// Process an ordered list of RcStartupFlags using ProcessArg.
blaze_exit_code::ExitCode ProcessArgs(
const std::vector<RcStartupFlag>& rcstartup_flags,
std::string *error);
// Adds any other options needed to result.
//
// TODO(jmmv): Now that we support site-specific options via subclasses of
// StartupOptions, the "ExtraOptions" concept makes no sense; remove it.
virtual void AddExtraOptions(std::vector<std::string> *result) const;
// Once startup options have been parsed, warn the user if certain options
// might combine in surprising ways.
virtual void MaybeLogStartupOptionWarnings() const = 0;
// Returns the path to the JVM. This should be called after parsing
// the startup options.
virtual blaze_util::Path GetJvm() const;
// Returns the executable used to start the Blaze server, typically the given
// JVM.
virtual blaze_util::Path GetExe(const blaze_util::Path &jvm,
const std::string &jar_path) const;
// Adds JVM prefix flags to be set. These will be added before all other
// JVM flags.
virtual void AddJVMArgumentPrefix(const blaze_util::Path &javabase,
std::vector<std::string> *result) const;
// Adds JVM suffix flags. These will be added after all other JVM flags, and
// just before the Blaze server startup flags.
virtual void AddJVMArgumentSuffix(const blaze_util::Path &real_install_dir,
const std::string &jar_path,
std::vector<std::string> *result) const;
// Adds JVM tuning flags for Blaze.
//
// Returns the exit code after this operation. "error" will be set to a
// descriptive string for any value other than blaze_exit_code::SUCCESS.
blaze_exit_code::ExitCode AddJVMArguments(
const blaze_util::Path &server_javabase, std::vector<std::string> *result,
const std::vector<std::string> &user_options, std::string *error) const;
// Checks whether "arg" is a valid nullary option (e.g. "--master_bazelrc" or
// "--nomaster_bazelrc").
//
// Returns true, if "arg" looks like either a valid nullary option or a
// potentially valid unary option. In this case, "result" will be populated
// with true iff "arg" is definitely a valid nullary option.
//
// Returns false, if "arg" looks like an attempt to pass a value to nullary
// option (e.g. "--nullary_option=idontknowwhatimdoing"). In this case,
// "error" will be populated with a user-friendly error message.
//
// Therefore, callers of this function should look at the return value and
// then either look at "result" (on true) or "error" (on false).
bool MaybeCheckValidNullary(const std::string &arg, bool *result,
std::string *error) const;
// Checks whether the argument is a valid unary option.
// E.g. --blazerc=foo, --blazerc foo.
bool IsUnary(const std::string& arg) const;
std::string GetLowercaseProductName() const;
// The capitalized name of this binary.
const std::string product_name;
// If supplied, alternate location to write the blaze server's jvm's stdout.
// Otherwise a default path in the output base is used.
blaze_util::Path server_jvm_out;
// Blaze's output base. Everything is relative to this. See
// the BlazeDirectories Java class for details.
blaze_util::Path output_base;
// Installation base for a specific release installation.
std::string install_base;
// The toplevel directory containing Blaze's output. When Blaze is
// run by a test, we use TEST_TMPDIR, simplifying the correct
// hermetic invocation of Blaze from tests.
std::string output_root;
// Blaze's output_user_root. Used only for computing install_base and
// output_base.
std::string output_user_root;
// Override more finegrained rc file flags and ignore them all.
bool ignore_all_rc_files;
// Whether to put the execroot at $OUTPUT_BASE/$WORKSPACE_NAME (if false) or
// $OUTPUT_BASE/execroot/$WORKSPACE_NAME (if true).
bool deep_execroot;
// Block for the Blaze server lock. Otherwise,
// quit with non-0 exit code if lock can't
// be acquired immediately.
bool block_for_lock;
bool host_jvm_debug;
std::string host_jvm_profile;
std::vector<std::string> host_jvm_args;
bool batch;
// From the man page: "This policy is useful for workloads that are
// non-interactive, but do not want to lower their nice value, and for
// workloads that want a deterministic scheduling policy without
// interactivity causing extra preemptions (between the workload's tasks)."
bool batch_cpu_scheduling;
// If negative, don't mess with ionice. Otherwise, set a level from 0-7
// for best-effort scheduling. 0 is highest priority, 7 is lowest.
int io_nice_level;
int max_idle_secs;
bool shutdown_on_low_sys_mem;
bool oom_more_eagerly;
int oom_more_eagerly_threshold;
bool write_command_log;
// If true, Blaze will listen to OS-level file change notifications.
bool watchfs;
// Temporary flag for enabling EventBus exceptions to be fatal.
bool fatal_event_bus_exceptions;
// A string to string map specifying where each option comes from. If the
// value is empty, it was on the command line, if it is a string, it comes
// from a blazerc file, if a key is not present, it is the default.
std::map<std::string, std::string> option_sources;
// Returns the embedded JDK, or an empty string.
blaze_util::Path GetEmbeddedJavabase() const;
// The source of truth for the server javabase.
enum class JavabaseType {
UNKNOWN,
// An explicit --server_javabase startup option.
EXPLICIT,
// The embedded JDK.
EMBEDDED,
// The default system JVM.
SYSTEM
};
// Returns the server javabase and its source of truth. This should be called
// after parsing the --server_javabase option.
std::pair<blaze_util::Path, JavabaseType> GetServerJavabaseAndType() const;
// Returns the server javabase. This should be called after parsing the
// --server_javabase option.
blaze_util::Path GetServerJavabase() const;
// Returns the explicit value of the --server_javabase startup option or the
// empty string if it was not specified on the command line.
blaze_util::Path GetExplicitServerJavabase() const;
// Port to start up the gRPC command server on. If 0, let the kernel choose.
int command_port;
// Connection timeout for each gRPC connection attempt.
int connect_timeout_secs;
// Invocation policy proto, or an empty string.
std::string invocation_policy;
// Invocation policy can only be specified once.
bool have_invocation_policy_;
// Whether to output addition debugging information in the client.
bool client_debug;
// Value of the java.util.logging.FileHandler.formatter Java property.
std::string java_logging_formatter;
bool expand_configs_in_place;
// The hash function to use when computing file digests.
std::string digest_function;
bool idle_server_tasks;
// The startup options as received from the user and rc files, tagged with
// their origin. This is populated by ProcessArgs.
std::vector<RcStartupFlag> original_startup_options_;
#if defined(__APPLE__)
// The QoS class to apply to the Bazel server process.
qos_class_t macos_qos_class;
#endif
// Whether to raise the soft coredump limit to the hard one or not.
bool unlimit_coredumps;
// Whether the execution transition is enabled, or behaves like a host
// transition. This must be set before rule classes are constructed.
// See https://github.com/bazelbuild/bazel/issues/7935
bool incompatible_enable_execution_transition;
protected:
// Constructor for subclasses only so that site-specific extensions of this
// class can override the product name. The product_name must be the
// capitalized version of the name, as in "Bazel".
StartupOptions(const std::string &product_name,
const WorkspaceLayout *workspace_layout);
// Checks extra fields when processing arg.
//
// Returns the exit code after processing the argument. "error" will contain
// a descriptive string for any return value other than
// blaze_exit_code::SUCCESS.
//
// TODO(jmmv): Now that we support site-specific options via subclasses of
// StartupOptions, the "ExtraOptions" concept makes no sense; remove it.
virtual blaze_exit_code::ExitCode ProcessArgExtra(
const char *arg, const char *next_arg, const std::string &rcfile,
const char **value, bool *is_processed, std::string *error) = 0;
// Checks whether the given javabase contains a java executable and runtime.
// On success, returns blaze_exit_code::SUCCESS. On error, prints an error
// message and returns an appropriate exit code with which the client should
// terminate.
blaze_exit_code::ExitCode SanityCheckJavabase(
const blaze_util::Path &javabase,
StartupOptions::JavabaseType javabase_type) const;
// Returns the absolute path to the user's local JDK install, to be used as
// the default target javabase and as a fall-back host_javabase. This is not
// the embedded JDK.
virtual blaze_util::Path GetSystemJavabase() const;
// Adds JVM logging-related flags for Bazel.
//
// This is called by StartupOptions::AddJVMArguments and is a separate method
// so that subclasses of StartupOptions can override it.
virtual void AddJVMLoggingArguments(std::vector<std::string> *result) const;
// Adds JVM memory tuning flags for Bazel.
//
// This is called by StartupOptions::AddJVMArguments and is a separate method
// so that subclasses of StartupOptions can override it.
virtual blaze_exit_code::ExitCode AddJVMMemoryArguments(
const blaze_util::Path &server_javabase, std::vector<std::string> *result,
const std::vector<std::string> &user_options, std::string *error) const;
virtual std::string GetRcFileBaseName() const = 0;
void RegisterUnaryStartupFlag(const std::string& flag_name);
// Register a nullary startup flag.
// Both '--flag_name' and '--noflag_name' will be registered as valid nullary
// flags. 'value' is the pointer to the boolean that will receive the flag's
// value.
void RegisterNullaryStartupFlag(const std::string &flag_name, bool *value);
// Same as RegisterNullaryStartupFlag, but these flags are forbidden in
// .bazelrc files.
void RegisterNullaryStartupFlagNoRc(const std::string &flag_name,
bool *value);
typedef std::function<void(bool)> SpecialNullaryFlagHandler;
void RegisterSpecialNullaryStartupFlag(const std::string &flag_name,
SpecialNullaryFlagHandler handler);
// Override the flag name to use in the 'option_sources' map.
void OverrideOptionSourcesKey(const std::string &flag_name,
const std::string &new_name);
private:
// Prevent copying and moving the object to avoid invalidating pointers to
// members (in all_nullary_startup_flags_ for example).
StartupOptions() = delete;
StartupOptions(const StartupOptions&) = delete;
StartupOptions& operator=(const StartupOptions&) = delete;
StartupOptions(StartupOptions&&) = delete;
StartupOptions& operator=(StartupOptions&&) = delete;
// Parses a single argument, either from the command line or from the .blazerc
// "startup" options.
//
// rcfile should be an empty string if the option being parsed does not come
// from a blazerc.
//
// Sets "is_space_separated" true if arg is unary and uses the "--foo bar"
// style, so its value is in next_arg.
//
// Sets "is_space_separated" false if arg is either nullary
// (e.g. "--[no]batch") or is unary but uses the "--foo=bar" style.
//
// Returns the exit code after processing the argument. "error" will contain
// a descriptive string for any return value other than
// blaze_exit_code::SUCCESS.
blaze_exit_code::ExitCode ProcessArg(const std::string &arg,
const std::string &next_arg,
const std::string &rcfile,
bool *is_space_separated,
std::string *error);
// The server javabase as provided on the commandline.
blaze_util::Path explicit_server_javabase_;
// The default server javabase to be used and its source of truth (computed
// lazily). Not guarded by a mutex - StartupOptions is not thread-safe.
mutable std::pair<blaze_util::Path, JavabaseType> default_server_javabase_;
// Startup flags that don't expect a value, e.g. "master_bazelrc".
// Valid uses are "--master_bazelrc" are "--nomaster_bazelrc".
// Keys are positive and negative flag names (e.g. "--master_bazelrc" and
// "--nomaster_bazelrc"), values are pointers to the boolean to mutate.
std::unordered_map<std::string, bool *> all_nullary_startup_flags_;
// Subset of 'all_nullary_startup_flags_'.
// Contains positive and negative names (e.g. "--master_bazelrc" and
// "--nomaster_bazelrc") of flags that must not appear in .bazelrc files.
std::unordered_set<std::string> no_rc_nullary_startup_flags_;
// Subset of 'all_nullary_startup_flags_'.
// Contains positive and negative names (e.g. "--master_bazelrc" and
// "--nomaster_bazelrc") of flags that have a special handler.
// Can be used for tri-state flags where omitting the flag completely means
// leaving the tri-state as "auto".
std::unordered_map<std::string, SpecialNullaryFlagHandler>
special_nullary_startup_flags_;
// Startup flags that expect a value, e.g. "bazelrc".
// Valid uses are "--bazelrc=foo" and "--bazelrc foo".
// Keys are flag names (e.g. "--bazelrc"), values are pointers to the string
// to mutate.
std::unordered_set<std::string> valid_unary_startup_flags_;
// Startup flags that use an alternative key name in the 'option_sources' map.
// For example, "--[no]master_bazelrc" uses "blazerc" as the map key.
std::unordered_map<std::string, std::string> option_sources_key_override_;
};
} // namespace blaze
#endif // BAZEL_SRC_MAIN_CPP_STARTUP_OPTIONS_H_