##// END OF EJS Templates
perf-tags: fix clear_cache_fnodes to actually clear that cache...
perf-tags: fix clear_cache_fnodes to actually clear that cache The function was not doing it what it advertise for a long time. So we fix it and we add a way for the perf extensions to detect broken version.

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main.rs
842 lines | 27.9 KiB | application/rls-services+xml | RustLexer
extern crate log;
use crate::error::CommandError;
use crate::ui::{local_to_utf8, Ui};
use clap::{command, Arg, ArgMatches};
use format_bytes::{format_bytes, join};
use hg::config::{Config, ConfigSource, PlainInfo};
use hg::repo::{Repo, RepoError};
use hg::utils::files::{get_bytes_from_os_str, get_path_from_bytes};
use hg::utils::SliceExt;
use hg::{exit_codes, requirements};
use std::borrow::Cow;
use std::collections::HashSet;
use std::ffi::OsString;
use std::os::unix::prelude::CommandExt;
use std::path::PathBuf;
use std::process::Command;
mod blackbox;
mod color;
mod error;
mod ui;
pub mod utils {
pub mod path_utils;
}
fn main_with_result(
argv: Vec<OsString>,
process_start_time: &blackbox::ProcessStartTime,
ui: &ui::Ui,
repo: Result<&Repo, &NoRepoInCwdError>,
config: &Config,
) -> Result<(), CommandError> {
check_unsupported(config, repo)?;
let app = command!()
.subcommand_required(true)
.arg(
Arg::new("repository")
.help("repository root directory")
.short('R')
.value_name("REPO")
// Both ok: `hg -R ./foo log` or `hg log -R ./foo`
.global(true),
)
.arg(
Arg::new("config")
.help("set/override config option (use 'section.name=value')")
.value_name("CONFIG")
.global(true)
.long("config")
// Ok: `--config section.key1=val --config section.key2=val2`
// Not ok: `--config section.key1=val section.key2=val2`
.action(clap::ArgAction::Append),
)
.arg(
Arg::new("cwd")
.help("change working directory")
.value_name("DIR")
.long("cwd")
.global(true),
)
.arg(
Arg::new("color")
.help("when to colorize (boolean, always, auto, never, or debug)")
.value_name("TYPE")
.long("color")
.global(true),
)
.version("0.0.1");
let app = add_subcommand_args(app);
let matches = app.try_get_matches_from(argv.iter())?;
let (subcommand_name, subcommand_args) =
matches.subcommand().expect("subcommand required");
// Mercurial allows users to define "defaults" for commands, fallback
// if a default is detected for the current command
let defaults = config.get_str(b"defaults", subcommand_name.as_bytes())?;
match defaults {
// Programmatic usage might set defaults to an empty string to unset
// it; allow that
None | Some("") => {}
Some(_) => {
let msg = "`defaults` config set";
return Err(CommandError::unsupported(msg));
}
}
for prefix in ["pre", "post", "fail"].iter() {
// Mercurial allows users to define generic hooks for commands,
// fallback if any are detected
let item = format!("{}-{}", prefix, subcommand_name);
let hook_for_command =
config.get_str_no_default(b"hooks", item.as_bytes())?;
if hook_for_command.is_some() {
let msg = format!("{}-{} hook defined", prefix, subcommand_name);
return Err(CommandError::unsupported(msg));
}
}
let run = subcommand_run_fn(subcommand_name)
.expect("unknown subcommand name from clap despite Command::subcommand_required");
let invocation = CliInvocation {
ui,
subcommand_args,
config,
repo,
};
if let Ok(repo) = repo {
// We don't support subrepos, fallback if the subrepos file is present
if repo.working_directory_vfs().join(".hgsub").exists() {
let msg = "subrepos (.hgsub is present)";
return Err(CommandError::unsupported(msg));
}
}
if config.is_extension_enabled(b"blackbox") {
let blackbox =
blackbox::Blackbox::new(&invocation, process_start_time)?;
blackbox.log_command_start(argv.iter());
let result = run(&invocation);
blackbox.log_command_end(
argv.iter(),
exit_code(
&result,
// TODO: show a warning or combine with original error if
// `get_bool` returns an error
config
.get_bool(b"ui", b"detailed-exit-code")
.unwrap_or(false),
),
);
result
} else {
run(&invocation)
}
}
fn rhg_main(argv: Vec<OsString>) -> ! {
// Run this first, before we find out if the blackbox extension is even
// enabled, in order to include everything in-between in the duration
// measurements. Reading config files can be slow if they’re on NFS.
let process_start_time = blackbox::ProcessStartTime::now();
env_logger::init();
// Make sure nothing in a future version of `rhg` sets the global
// threadpool before we can cap default threads. (This is also called
// in core because Python uses the same code path, we're adding a
// redundant check.)
hg::utils::cap_default_rayon_threads()
.expect("Rayon threadpool already initialized");
let early_args = EarlyArgs::parse(&argv);
let initial_current_dir = early_args.cwd.map(|cwd| {
let cwd = get_path_from_bytes(&cwd);
std::env::current_dir()
.and_then(|initial| {
std::env::set_current_dir(cwd)?;
Ok(initial)
})
.unwrap_or_else(|error| {
exit(
&argv,
&None,
&Ui::new_infallible(&Config::empty()),
OnUnsupported::Abort,
Err(CommandError::abort(format!(
"abort: {}: '{}'",
error,
cwd.display()
))),
false,
)
})
});
let mut non_repo_config =
Config::load_non_repo().unwrap_or_else(|error| {
// Normally this is decided based on config, but we don’t have that
// available. As of this writing config loading never returns an
// "unsupported" error but that is not enforced by the type system.
let on_unsupported = OnUnsupported::Abort;
exit(
&argv,
&initial_current_dir,
&Ui::new_infallible(&Config::empty()),
on_unsupported,
Err(error.into()),
false,
)
});
non_repo_config
.load_cli_args(early_args.config, early_args.color)
.unwrap_or_else(|error| {
exit(
&argv,
&initial_current_dir,
&Ui::new_infallible(&non_repo_config),
OnUnsupported::from_config(&non_repo_config),
Err(error.into()),
non_repo_config
.get_bool(b"ui", b"detailed-exit-code")
.unwrap_or(false),
)
});
if let Some(repo_path_bytes) = &early_args.repo {
lazy_static::lazy_static! {
static ref SCHEME_RE: regex::bytes::Regex =
// Same as `_matchscheme` in `mercurial/util.py`
regex::bytes::Regex::new("^[a-zA-Z0-9+.\\-]+:").unwrap();
}
if SCHEME_RE.is_match(repo_path_bytes) {
exit(
&argv,
&initial_current_dir,
&Ui::new_infallible(&non_repo_config),
OnUnsupported::from_config(&non_repo_config),
Err(CommandError::UnsupportedFeature {
message: format_bytes!(
b"URL-like --repository {}",
repo_path_bytes
),
}),
// TODO: show a warning or combine with original error if
// `get_bool` returns an error
non_repo_config
.get_bool(b"ui", b"detailed-exit-code")
.unwrap_or(false),
)
}
}
let repo_arg = early_args.repo.unwrap_or_default();
let repo_path: Option<PathBuf> = {
if repo_arg.is_empty() {
None
} else {
let local_config = {
if std::env::var_os("HGRCSKIPREPO").is_none() {
// TODO: handle errors from find_repo_root
if let Ok(current_dir_path) = Repo::find_repo_root() {
let config_files = vec![
ConfigSource::AbsPath(
current_dir_path.join(".hg/hgrc"),
),
ConfigSource::AbsPath(
current_dir_path.join(".hg/hgrc-not-shared"),
),
];
// TODO: handle errors from
// `load_from_explicit_sources`
Config::load_from_explicit_sources(config_files).ok()
} else {
None
}
} else {
None
}
};
let non_repo_config_val = {
let non_repo_val = non_repo_config.get(b"paths", &repo_arg);
match &non_repo_val {
Some(val) if !val.is_empty() => home::home_dir()
.unwrap_or_else(|| PathBuf::from("~"))
.join(get_path_from_bytes(val))
.canonicalize()
// TODO: handle error and make it similar to python
// implementation maybe?
.ok(),
_ => None,
}
};
let config_val = match &local_config {
None => non_repo_config_val,
Some(val) => {
let local_config_val = val.get(b"paths", &repo_arg);
match &local_config_val {
Some(val) if !val.is_empty() => {
// presence of a local_config assures that
// current_dir
// wont result in an Error
let canpath = hg::utils::current_dir()
.unwrap()
.join(get_path_from_bytes(val))
.canonicalize();
canpath.ok().or(non_repo_config_val)
}
_ => non_repo_config_val,
}
}
};
config_val
.or_else(|| Some(get_path_from_bytes(&repo_arg).to_path_buf()))
}
};
let simple_exit =
|ui: &Ui, config: &Config, result: Result<(), CommandError>| -> ! {
exit(
&argv,
&initial_current_dir,
ui,
OnUnsupported::from_config(config),
result,
// TODO: show a warning or combine with original error if
// `get_bool` returns an error
non_repo_config
.get_bool(b"ui", b"detailed-exit-code")
.unwrap_or(false),
)
};
let early_exit = |config: &Config, error: CommandError| -> ! {
simple_exit(&Ui::new_infallible(config), config, Err(error))
};
let repo_result = match Repo::find(&non_repo_config, repo_path.to_owned())
{
Ok(repo) => Ok(repo),
Err(RepoError::NotFound { at }) if repo_path.is_none() => {
// Not finding a repo is not fatal yet, if `-R` was not given
Err(NoRepoInCwdError { cwd: at })
}
Err(error) => early_exit(&non_repo_config, error.into()),
};
let config = if let Ok(repo) = &repo_result {
repo.config()
} else {
&non_repo_config
};
let mut config_cow = Cow::Borrowed(config);
config_cow.to_mut().apply_plain(PlainInfo::from_env());
if !ui::plain(Some("tweakdefaults"))
&& config_cow
.as_ref()
.get_bool(b"ui", b"tweakdefaults")
.unwrap_or_else(|error| early_exit(config, error.into()))
{
config_cow.to_mut().tweakdefaults()
};
let config = config_cow.as_ref();
let ui = Ui::new(config)
.unwrap_or_else(|error| early_exit(config, error.into()));
if let Ok(true) = config.get_bool(b"rhg", b"fallback-immediately") {
exit(
&argv,
&initial_current_dir,
&ui,
OnUnsupported::fallback(config),
Err(CommandError::unsupported(
"`rhg.fallback-immediately is true`",
)),
false,
)
}
let result = main_with_result(
argv.iter().map(|s| s.to_owned()).collect(),
&process_start_time,
&ui,
repo_result.as_ref(),
config,
);
simple_exit(&ui, config, result)
}
fn main() -> ! {
rhg_main(std::env::args_os().collect())
}
fn exit_code(
result: &Result<(), CommandError>,
use_detailed_exit_code: bool,
) -> i32 {
match result {
Ok(()) => exit_codes::OK,
Err(CommandError::Abort {
detailed_exit_code, ..
}) => {
if use_detailed_exit_code {
*detailed_exit_code
} else {
exit_codes::ABORT
}
}
Err(CommandError::Unsuccessful) => exit_codes::UNSUCCESSFUL,
// Exit with a specific code and no error message to let a potential
// wrapper script fallback to Python-based Mercurial.
Err(CommandError::UnsupportedFeature { .. }) => {
exit_codes::UNIMPLEMENTED
}
Err(CommandError::InvalidFallback { .. }) => {
exit_codes::INVALID_FALLBACK
}
}
}
fn exit(
original_args: &[OsString],
initial_current_dir: &Option<PathBuf>,
ui: &Ui,
mut on_unsupported: OnUnsupported,
result: Result<(), CommandError>,
use_detailed_exit_code: bool,
) -> ! {
if let (
OnUnsupported::Fallback { executable },
Err(CommandError::UnsupportedFeature { message }),
) = (&on_unsupported, &result)
{
let mut args = original_args.iter();
let executable = match executable {
None => {
exit_no_fallback(
ui,
OnUnsupported::Abort,
Err(CommandError::abort(
"abort: 'rhg.on-unsupported=fallback' without \
'rhg.fallback-executable' set.",
)),
false,
);
}
Some(executable) => executable,
};
let executable_path = get_path_from_bytes(executable);
let this_executable = args.next().expect("exepcted argv[0] to exist");
if executable_path == *this_executable {
// Avoid spawning infinitely many processes until resource
// exhaustion.
let _ = ui.write_stderr(&format_bytes!(
b"Blocking recursive fallback. The 'rhg.fallback-executable = {}' config \
points to `rhg` itself.\n",
executable
));
on_unsupported = OnUnsupported::Abort
} else {
log::debug!("falling back (see trace-level log)");
log::trace!("{}", local_to_utf8(message));
if let Err(err) = which::which(executable_path) {
exit_no_fallback(
ui,
OnUnsupported::Abort,
Err(CommandError::InvalidFallback {
path: executable.to_owned(),
err: err.to_string(),
}),
use_detailed_exit_code,
)
}
// `args` is now `argv[1..]` since we’ve already consumed
// `argv[0]`
let mut command = Command::new(executable_path);
command.args(args);
if let Some(initial) = initial_current_dir {
command.current_dir(initial);
}
// We don't use subprocess because proper signal handling is harder
// and we don't want to keep `rhg` around after a fallback anyway.
// For example, if `rhg` is run in the background and falls back to
// `hg` which, in turn, waits for a signal, we'll get stuck if
// we're doing plain subprocess.
//
// If `exec` returns, we can only assume our process is very broken
// (see its documentation), so only try to forward the error code
// when exiting.
let err = command.exec();
std::process::exit(
err.raw_os_error().unwrap_or(exit_codes::ABORT),
);
}
}
exit_no_fallback(ui, on_unsupported, result, use_detailed_exit_code)
}
fn exit_no_fallback(
ui: &Ui,
on_unsupported: OnUnsupported,
result: Result<(), CommandError>,
use_detailed_exit_code: bool,
) -> ! {
match &result {
Ok(_) => {}
Err(CommandError::Unsuccessful) => {}
Err(CommandError::Abort { message, hint, .. }) => {
// Ignore errors when writing to stderr, we’re already exiting
// with failure code so there’s not much more we can do.
if !message.is_empty() {
let _ = ui.write_stderr(&format_bytes!(b"{}\n", message));
}
if let Some(hint) = hint {
let _ = ui.write_stderr(&format_bytes!(b"({})\n", hint));
}
}
Err(CommandError::UnsupportedFeature { message }) => {
match on_unsupported {
OnUnsupported::Abort => {
let _ = ui.write_stderr(&format_bytes!(
b"unsupported feature: {}\n",
message
));
}
OnUnsupported::AbortSilent => {}
OnUnsupported::Fallback { .. } => unreachable!(),
}
}
Err(CommandError::InvalidFallback { path, err }) => {
let _ = ui.write_stderr(&format_bytes!(
b"abort: invalid fallback '{}': {}\n",
path,
err.as_bytes(),
));
}
}
std::process::exit(exit_code(&result, use_detailed_exit_code))
}
macro_rules! subcommands {
($( $command: ident )+) => {
mod commands {
$(
pub mod $command;
)+
}
fn add_subcommand_args(app: clap::Command) -> clap::Command {
app
$(
.subcommand(commands::$command::args())
)+
}
pub type RunFn = fn(&CliInvocation) -> Result<(), CommandError>;
fn subcommand_run_fn(name: &str) -> Option<RunFn> {
match name {
$(
stringify!($command) => Some(commands::$command::run),
)+
_ => None,
}
}
};
}
subcommands! {
cat
debugdata
debugrequirements
debugignorerhg
debugrhgsparse
files
root
config
status
}
pub struct CliInvocation<'a> {
ui: &'a Ui,
subcommand_args: &'a ArgMatches,
config: &'a Config,
/// References inside `Result` is a bit peculiar but allow
/// `invocation.repo?` to work out with `&CliInvocation` since this
/// `Result` type is `Copy`.
repo: Result<&'a Repo, &'a NoRepoInCwdError>,
}
struct NoRepoInCwdError {
cwd: PathBuf,
}
/// CLI arguments to be parsed "early" in order to be able to read
/// configuration before using Clap. Ideally we would also use Clap for this,
/// see <https://github.com/clap-rs/clap/discussions/2366>.
///
/// These arguments are still declared when we do use Clap later, so that Clap
/// does not return an error for their presence.
struct EarlyArgs {
/// Values of all `--config` arguments. (Possibly none)
config: Vec<Vec<u8>>,
/// Value of all the `--color` argument, if any.
color: Option<Vec<u8>>,
/// Value of the `-R` or `--repository` argument, if any.
repo: Option<Vec<u8>>,
/// Value of the `--cwd` argument, if any.
cwd: Option<Vec<u8>>,
}
impl EarlyArgs {
fn parse<'a>(args: impl IntoIterator<Item = &'a OsString>) -> Self {
let mut args = args.into_iter().map(get_bytes_from_os_str);
let mut config = Vec::new();
let mut color = None;
let mut repo = None;
let mut cwd = None;
// Use `while let` instead of `for` so that we can also call
// `args.next()` inside the loop.
while let Some(arg) = args.next() {
if arg == b"--config" {
if let Some(value) = args.next() {
config.push(value)
}
} else if let Some(value) = arg.drop_prefix(b"--config=") {
config.push(value.to_owned())
}
if arg == b"--color" {
if let Some(value) = args.next() {
color = Some(value)
}
} else if let Some(value) = arg.drop_prefix(b"--color=") {
color = Some(value.to_owned())
}
if arg == b"--cwd" {
if let Some(value) = args.next() {
cwd = Some(value)
}
} else if let Some(value) = arg.drop_prefix(b"--cwd=") {
cwd = Some(value.to_owned())
}
if arg == b"--repository" || arg == b"-R" {
if let Some(value) = args.next() {
repo = Some(value)
}
} else if let Some(value) = arg.drop_prefix(b"--repository=") {
repo = Some(value.to_owned())
} else if let Some(value) = arg.drop_prefix(b"-R") {
repo = Some(value.to_owned())
}
}
Self {
config,
color,
repo,
cwd,
}
}
}
/// What to do when encountering some unsupported feature.
///
/// See `HgError::UnsupportedFeature` and `CommandError::UnsupportedFeature`.
enum OnUnsupported {
/// Print an error message describing what feature is not supported,
/// and exit with code 252.
Abort,
/// Silently exit with code 252.
AbortSilent,
/// Try running a Python implementation
Fallback { executable: Option<Vec<u8>> },
}
impl OnUnsupported {
const DEFAULT: Self = OnUnsupported::Abort;
fn fallback_executable(config: &Config) -> Option<Vec<u8>> {
config
.get(b"rhg", b"fallback-executable")
.map(|x| x.to_owned())
}
fn fallback(config: &Config) -> Self {
OnUnsupported::Fallback {
executable: Self::fallback_executable(config),
}
}
fn from_config(config: &Config) -> Self {
match config
.get(b"rhg", b"on-unsupported")
.map(|value| value.to_ascii_lowercase())
.as_deref()
{
Some(b"abort") => OnUnsupported::Abort,
Some(b"abort-silent") => OnUnsupported::AbortSilent,
Some(b"fallback") => Self::fallback(config),
None => Self::DEFAULT,
Some(_) => {
// TODO: warn about unknown config value
Self::DEFAULT
}
}
}
}
/// The `*` extension is an edge-case for config sub-options that apply to all
/// extensions. For now, only `:required` exists, but that may change in the
/// future.
const SUPPORTED_EXTENSIONS: &[&[u8]] = &[
b"blackbox",
b"share",
b"sparse",
b"narrow",
b"*",
b"strip",
b"rebase",
];
fn check_extensions(config: &Config) -> Result<(), CommandError> {
if let Some(b"*") = config.get(b"rhg", b"ignored-extensions") {
// All extensions are to be ignored, nothing to do here
return Ok(());
}
let enabled: HashSet<&[u8]> = config
.iter_section(b"extensions")
.filter_map(|(extension, value)| {
if value == b"!" {
// Filter out disabled extensions
return None;
}
// Ignore extension suboptions. Only `required` exists for now.
// `rhg` either supports an extension or doesn't, so it doesn't
// make sense to consider the loading of an extension.
let actual_extension =
extension.split_2(b':').unwrap_or((extension, b"")).0;
Some(actual_extension)
})
.collect();
let mut unsupported = enabled;
for supported in SUPPORTED_EXTENSIONS {
unsupported.remove(supported);
}
if let Some(ignored_list) = config.get_list(b"rhg", b"ignored-extensions")
{
for ignored in ignored_list {
unsupported.remove(ignored.as_slice());
}
}
if unsupported.is_empty() {
Ok(())
} else {
let mut unsupported: Vec<_> = unsupported.into_iter().collect();
// Sort the extensions to get a stable output
unsupported.sort();
Err(CommandError::UnsupportedFeature {
message: format_bytes!(
b"extensions: {} (consider adding them to 'rhg.ignored-extensions' config)",
join(unsupported, b", ")
),
})
}
}
/// Array of tuples of (auto upgrade conf, feature conf, local requirement)
#[allow(clippy::type_complexity)]
const AUTO_UPGRADES: &[((&str, &str), (&str, &str), &str)] = &[
(
("format", "use-share-safe.automatic-upgrade-of-mismatching-repositories"),
("format", "use-share-safe"),
requirements::SHARESAFE_REQUIREMENT,
),
(
("format", "use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories"),
("format", "use-dirstate-tracked-hint"),
requirements::DIRSTATE_TRACKED_HINT_V1,
),
(
("format", "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories"),
("format", "use-dirstate-v2"),
requirements::DIRSTATE_V2_REQUIREMENT,
),
];
/// Mercurial allows users to automatically upgrade their repository.
/// `rhg` does not have the ability to upgrade yet, so fallback if an upgrade
/// is needed.
fn check_auto_upgrade(
config: &Config,
reqs: &HashSet<String>,
) -> Result<(), CommandError> {
for (upgrade_conf, feature_conf, local_req) in AUTO_UPGRADES.iter() {
let auto_upgrade = config
.get_bool(upgrade_conf.0.as_bytes(), upgrade_conf.1.as_bytes())?;
if auto_upgrade {
let want_it = config.get_bool(
feature_conf.0.as_bytes(),
feature_conf.1.as_bytes(),
)?;
let have_it = reqs.contains(*local_req);
let action = match (want_it, have_it) {
(true, false) => Some("upgrade"),
(false, true) => Some("downgrade"),
_ => None,
};
if let Some(action) = action {
let message = format!(
"automatic {} {}.{}",
action, upgrade_conf.0, upgrade_conf.1
);
return Err(CommandError::unsupported(message));
}
}
}
Ok(())
}
fn check_unsupported(
config: &Config,
repo: Result<&Repo, &NoRepoInCwdError>,
) -> Result<(), CommandError> {
check_extensions(config)?;
if std::env::var_os("HG_PENDING").is_some() {
// TODO: only if the value is `== repo.working_directory`?
// What about relative v.s. absolute paths?
Err(CommandError::unsupported("$HG_PENDING"))?
}
if let Ok(repo) = repo {
if repo.has_subrepos()? {
Err(CommandError::unsupported("sub-repositories"))?
}
check_auto_upgrade(config, repo.requirements())?;
}
if config.has_non_empty_section(b"encode") {
Err(CommandError::unsupported("[encode] config"))?
}
if config.has_non_empty_section(b"decode") {
Err(CommandError::unsupported("[decode] config"))?
}
Ok(())
}