determinator/rules.rs
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// Copyright (c) The cargo-guppy Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Custom rules for the target determinator.
//!
//! By default, the target determinator follows a simple set of rules:
//! * Every changed path is matched to its nearest package, and that package is marked changed.
//! * Cargo builds are simulated against the old and new package graphs, and any packages with
//! different results are marked changed.
//! * The affected set is found through observing simulated Cargo builds and doing a reverse map.
//!
//! However, there is often a need to customize these rules, for example to:
//! * ignore certain files
//! * build everything if certain files or packages have changed
//! * add *virtual dependencies* that Cargo may not know about: if a package changes, also consider
//! certain other packages as changed.
//!
//! These custom behaviors can be specified through *determinator rules*.
//!
//! There are two sorts of determinator rules:
//! * **Path rules** match on changed paths, and are applied **in order**, before regular matches.
//! * **Package rules** match based on changed packages, and are applied as required until
//! exhausted (i.e. a fixpoint is reached).
//!
//! Determinator rules are a configuration file format and can be read from a TOML file.
//!
//! # Default path rules
//!
//! The determinator ships with a set of default path rules for common files such as `.gitignore`
//! and `Cargo.lock`. These rules are applied *after* custom rules, so custom rules matching the
//! same paths can override them.
//!
//! The default rules can be [viewed here](DeterminatorRules::DEFAULT_RULES_TOML).
//!
//! To disable default rules entirely, set at the top level:
//!
//! ```toml
//! use-default-rules = false
//! ```
//!
//! # Examples for path rules
//!
//! To ignore all files named `README.md` and `README.tpl`, and skip all further processing:
//!
//! ```toml
//! [[path-rule]]
//! # Globs are implemented using globset: https://docs.rs/globset/0.4
//! globs = ["**/README.md", "**/README.tpl"]
//! mark-changed = []
//! # "skip" is the default for post-rule, so it can be omitted.
//! post-rule = "skip"
//! ```
//!
//! To mark a package changed if a file in a different directory changes, but also continue to
//! use the standard algorithm to match paths to their nearest package:
//!
//! ```toml
//! [[path-rule]]
//! # Note that globs are relative to the root of the workspace.
//! globs = ["cargo-guppy/src/lib.rs"]
//! # Workspace packages are specified through their names.
//! mark-changed = ["cargo-compare"]
//! # "skip-rules" means that cargo-guppy/src/lib.rs will also match cargo-guppy.
//! post-rule = "skip-rules"
//! ```
//!
//! To build everything if a special file changes:
//!
//! ```toml
//! [[path-rule]]
//! name = "rust-toolchain"
//! mark-changed = "all"
//! ```
//!
//! To apply multiple rules to a file, say `CODE_OF_CONDUCT.md`:
//!
//! ```toml
//! [[path-rule]]
//! globs = ["CODE_OF_CONDUCT.md", "CONTRIBUTING.md"]
//! mark-changed = ["cargo-guppy"]
//! # "fallthrough" means further rules are applied as well.
//! post-rule = "fallthrough"
//!
//! [[path-rule]]
//! globs = ["CODE_OF_CONDUCT.md"]
//! mark-changed = ["guppy"]
//! ```
//!
//! # Examples for package rules
//!
//! To add a "virtual dependency" that Cargo may not know about:
//!
//! ```toml
//! [[package-rule]]
//! on-affected = ["fixtures"]
//! mark-changed = ["guppy-cmdlib"]
//! ```
//!
//! To build everything if a package changes.
//!
//! ```toml
//! [[package-rule]]
//! on-affected = ["guppy-benchmarks"]
//! mark-changed = "all"
//! ```
use crate::errors::RulesError;
use globset::{Glob, GlobSet, GlobSetBuilder};
use guppy::graph::{PackageGraph, PackageMetadata, PackageSet, Workspace};
use once_cell::sync::Lazy;
use serde::{Deserialize, Serialize};
use std::fmt;
/// Rules for the target determinator.
///
/// This forms a configuration file format that can be read from a TOML file.
///
/// For more about determinator rules, see [the module-level documentation](index.html).
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
pub struct DeterminatorRules {
/// Whether to use the default rules, as specified by `DEFAULT_RULES_TOML` and `default_rules`.
///
/// This is true by default.
#[serde(default = "default_true", rename = "use-default-rules")]
use_default_rules: bool,
/// A list of rules that each changed file path is matched against.
#[serde(default, rename = "path-rule")]
pub path_rules: Vec<PathRule>,
/// A list of rules that each affected package is matched against.
///
/// Sometimes, dependencies between workspace packages aren't expressed in Cargo.tomls. The
/// packages here act as "virtual dependencies" for the determinator.
#[serde(default, rename = "package-rule")]
pub package_rules: Vec<PackageRule>,
}
/// The `Default` impl is the set of custom rules used by the determinator if
/// [`set_rules`](crate::Determinator::set_rules) isn't called. It is an empty set of determinator
/// rules, with `use_default_rules` set to true. This means that if `set_rules` isn't
/// called, the only rules in effect are the default ones.
impl Default for DeterminatorRules {
fn default() -> Self {
Self {
use_default_rules: true,
path_rules: vec![],
package_rules: vec![],
}
}
}
#[inline]
fn default_true() -> bool {
true
}
/// A hack that lets the contents of default-rules.toml be included.
macro_rules! doc_comment {
($doc:expr, $($t:tt)*) => (
#[doc = $doc]
$($t)*
);
}
impl DeterminatorRules {
/// Deserializes determinator rules from the given TOML string.
pub fn parse(s: &str) -> Result<Self, toml::de::Error> {
toml::from_str(s)
}
doc_comment! {
concat!("\
Contains the default rules in a TOML file format.
The default rules included with this copy of the determinator are:
```toml
", include_str!("../default-rules.toml"), "\
```
The latest version of the default rules is available
[on GitHub](https://github.com/guppy-rs/guppy/blob/main/tools/determinator/default-rules.toml).
"),
pub const DEFAULT_RULES_TOML: &'static str = include_str!("../default-rules.toml");
}
/// Returns the default rules.
///
/// These rules are applied *after* any custom rules, so they can be overridden by custom rules.
pub fn default_rules() -> &'static DeterminatorRules {
static DEFAULT_RULES: Lazy<DeterminatorRules> = Lazy::new(|| {
DeterminatorRules::parse(DeterminatorRules::DEFAULT_RULES_TOML)
.expect("default rules should parse")
});
&DEFAULT_RULES
}
}
/// Path-based rules for the determinator.
///
/// These rules customize the behavior of the determinator based on changed paths.
///
/// # Examples
///
/// ```toml
/// [[path-rule]]
/// globs = ["**/README.md", "**/README.tpl"]
/// mark-changed = ["guppy"]
/// ```
///
/// For more examples, see [the module-level documentation](index.html).
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(deny_unknown_fields, rename_all = "kebab-case")]
pub struct PathRule {
/// The globs to match against.
///
/// A changed path matches a rule if it matches any of the globs on this list.
///
/// # Examples
///
/// In TOML format, this is specified as [`globset`](https://docs.rs/globset/0.4) globs:
///
/// ```toml
/// globs = ["foo", "**/bar/*.rs"]
/// ```
pub globs: Vec<String>,
/// The set of packages to mark as changed.
///
/// # Examples
///
/// In TOML format, this may be the string `"all"` to cause all packages to be marked changed:
///
/// ```toml
/// mark-changed = "all"
/// ```
///
/// Alternatively, `mark-changed` may be an array of workspace package names:
///
/// ```toml
/// mark-changed = ["guppy", "determinator"]
/// ```
#[serde(with = "mark_changed_impl")]
pub mark_changed: DeterminatorMarkChanged,
/// The operation to perform after applying the rule. Set to "skip" by default.
#[serde(default)]
pub post_rule: DeterminatorPostRule,
}
/// The operation to perform after applying the rule.
#[derive(Copy, Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(rename_all = "kebab-case")]
#[non_exhaustive]
#[derive(Default)]
pub enum DeterminatorPostRule {
/// Skip all further processing of this path.
///
/// This is the default.
///
/// # Examples
///
/// In TOML format, specified as the string `"skip"`:
///
/// ```toml
/// post-rule = "skip"
/// ```
#[default]
Skip,
/// Skip rule processing but continue attempting to match the changed path to the nearest
/// package name.
///
/// # Examples
///
/// In TOML format, specified as the string `"skip-rules"`:
///
/// ```toml
/// post-rule = "skip-rules"
/// ```
SkipRules,
/// Continue to apply further rules.
///
/// # Examples
///
/// In TOML format, specified as the string `"fallthrough"`:
///
/// ```toml
/// post-rule = "fallthrough"
/// ```
Fallthrough,
}
/// Package-based rules for the determinator.
///
/// These rules customize the behavior of the determinator based on affected packages, and can be
/// used to insert "virtual dependencies" that Cargo may not be aware of.
///
/// # Examples
///
/// ```toml
/// [[package-rules]]
/// on-affected = ["determinator"]
/// mark-changed = ["guppy"]
/// ```
///
/// For more examples, see [the module-level documentation](index.html).
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(deny_unknown_fields, rename_all = "kebab-case")]
pub struct PackageRule {
/// The package names to match against.
///
/// If any of the packages in this list is affected, the given packages will be marked changed.
///
/// # Examples
///
/// In TOML format, specified as an array of workspace package names:
///
/// ```toml
/// on-affected = ["target-spec", "guppy"]
/// ```
pub on_affected: Vec<String>,
/// The set of packages to mark as changed.
///
/// # Examples
///
/// In TOML format, this may be the string `"all"`:
///
/// ```toml
/// mark-changed = "all"
/// ```
///
/// or an array of workspace package names:
///
/// ```toml
/// mark-changed = ["guppy", "determinator"]
/// ```
#[serde(with = "mark_changed_impl")]
pub mark_changed: DeterminatorMarkChanged,
}
/// The set of packages to mark as changed.
///
/// # Examples
///
/// In TOML format, this may be the string `"all"` to cause all packages to be marked changed:
///
/// ```toml
/// mark-changed = "all"
/// ```
///
/// Alternatively, `mark-changed` may be an array of workspace package names:
///
/// ```toml
/// mark-changed = ["guppy", "determinator"]
/// ```
///
/// For more examples, see [the module-level documentation](index.html).
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(rename_all = "kebab-case", untagged)]
pub enum DeterminatorMarkChanged {
/// Mark the workspace packages with the given names as changed.
///
/// This may be empty:
///
/// ```toml
/// mark-changed = []
/// ```
Packages(Vec<String>),
/// Mark the entire tree as changed. Skip over all further processing and return the entire
/// workspace as affected.
///
/// This is most useful for global files that affect the environment.
All,
}
/// The result of matching a file path against a determinator.
///
/// Returned by `Determinator::match_path`.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum PathMatch {
/// The path matched a rule, causing everything to be rebuilt.
RuleMatchedAll,
/// The path matched a rule and ancestor-based matching was not followed.
///
/// This will not be returned if the matched rule caused ancestor-based matching to happen.
RuleMatched(RuleIndex),
/// The path was matched to a package through inspecting the parent directories of each path.
AncestorMatched,
/// The path wasn't matched to a rule or a nearby package, causing everything to be rebuilt.
NoMatches,
}
/// The index of a rule.
///
/// Used in `PathMatch` and while returning errors.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub enum RuleIndex {
/// The custom path rule at this index.
CustomPath(usize),
/// The default path rule at this index.
DefaultPath(usize),
/// The package rule at this index.
///
/// All package rules are custom: there are no default package rules.
Package(usize),
}
impl fmt::Display for RuleIndex {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
RuleIndex::CustomPath(index) => write!(f, "custom path rule {}", index),
RuleIndex::DefaultPath(index) => write!(f, "default path rule {}", index),
RuleIndex::Package(index) => write!(f, "package rule {}", index),
}
}
}
// ---
// Private types
// ---
/// Internal version of determinator rules.
#[derive(Clone, Debug)]
pub(crate) struct RulesImpl<'g> {
pub(crate) path_rules: Vec<PathRuleImpl<'g>>,
pub(crate) package_rules: Vec<PackageRuleImpl<'g>>,
}
impl<'g> RulesImpl<'g> {
pub(crate) fn new(
graph: &'g PackageGraph,
options: &DeterminatorRules,
) -> Result<Self, RulesError> {
let workspace = graph.workspace();
let custom_path_rules = options
.path_rules
.iter()
.enumerate()
.map(|(idx, rule)| (RuleIndex::CustomPath(idx), rule));
let default_path_rules = if options.use_default_rules {
let default_rules = DeterminatorRules::default_rules();
default_rules.path_rules.as_slice()
} else {
&[]
};
let default_path_rules = default_path_rules
.iter()
.enumerate()
.map(|(idx, rule)| (RuleIndex::DefaultPath(idx), rule));
// Default rules come after custom ones.
let path_rules = custom_path_rules
.chain(default_path_rules)
.map(
|(
rule_index,
PathRule {
globs,
mark_changed,
post_rule,
},
)| {
// Convert the globs to a globset.
let mut builder = GlobSetBuilder::new();
for glob in globs {
let glob = Glob::new(glob)
.map_err(|err| RulesError::glob_parse(rule_index, err))?;
builder.add(glob);
}
let glob_set = builder
.build()
.map_err(|err| RulesError::glob_parse(rule_index, err))?;
// Convert workspace paths to packages.
let mark_changed = MarkChangedImpl::new(&workspace, mark_changed)
.map_err(|err| RulesError::resolve_ref(rule_index, err))?;
Ok(PathRuleImpl {
rule_index,
glob_set,
mark_changed,
post_rule: *post_rule,
})
},
)
.collect::<Result<Vec<_>, _>>()?;
let package_rules = options
.package_rules
.iter()
.enumerate()
.map(
|(
rule_index,
PackageRule {
on_affected,
mark_changed,
},
)| {
let rule_index = RuleIndex::Package(rule_index);
let on_affected = graph
.resolve_workspace_names(on_affected)
.map_err(|err| RulesError::resolve_ref(rule_index, err))?;
let mark_changed = MarkChangedImpl::new(&workspace, mark_changed)
.map_err(|err| RulesError::resolve_ref(rule_index, err))?;
Ok(PackageRuleImpl {
on_affected,
mark_changed,
})
},
)
.collect::<Result<Vec<_>, _>>()?;
Ok(Self {
path_rules,
package_rules,
})
}
}
#[derive(Clone, Debug)]
pub(crate) struct PathRuleImpl<'g> {
pub(crate) rule_index: RuleIndex,
pub(crate) glob_set: GlobSet,
pub(crate) mark_changed: MarkChangedImpl<'g>,
pub(crate) post_rule: DeterminatorPostRule,
}
#[derive(Clone, Debug)]
pub(crate) struct PackageRuleImpl<'g> {
pub(crate) on_affected: PackageSet<'g>,
pub(crate) mark_changed: MarkChangedImpl<'g>,
}
#[derive(Clone, Debug)]
pub(crate) enum MarkChangedImpl<'g> {
All,
Packages(Vec<PackageMetadata<'g>>),
}
impl<'g> MarkChangedImpl<'g> {
fn new(
workspace: &Workspace<'g>,
mark_changed: &DeterminatorMarkChanged,
) -> Result<Self, guppy::Error> {
match mark_changed {
DeterminatorMarkChanged::Packages(names) => Ok(MarkChangedImpl::Packages(
workspace.members_by_names(names)?,
)),
DeterminatorMarkChanged::All => Ok(MarkChangedImpl::All),
}
}
}
mod mark_changed_impl {
use super::*;
use serde::{de::Error, Deserializer, Serializer};
pub fn serialize<S>(
mark_changed: &DeterminatorMarkChanged,
serializer: S,
) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match mark_changed {
DeterminatorMarkChanged::Packages(names) => names.serialize(serializer),
DeterminatorMarkChanged::All => "all".serialize(serializer),
}
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<DeterminatorMarkChanged, D::Error>
where
D: Deserializer<'de>,
{
let d = MarkChangedDeserialized::deserialize(deserializer)?;
match d {
MarkChangedDeserialized::String(s) => match s.as_str() {
"all" => Ok(DeterminatorMarkChanged::All),
other => Err(D::Error::custom(format!(
"unknown string for mark-changed: {}",
other,
))),
},
MarkChangedDeserialized::VecString(strings) => {
Ok(DeterminatorMarkChanged::Packages(strings))
}
}
}
#[derive(Deserialize)]
#[serde(untagged)]
enum MarkChangedDeserialized {
String(String),
VecString(Vec<String>),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse() {
let s = r#"[[path-rule]]
globs = ["all/*"]
mark-changed = "all"
post-rule = "fallthrough"
[[path-rule]]
globs = ["all/1/2/*"]
mark-changed = ["c"]
post-rule = "skip-rules"
[[path-rule]]
globs = ["none/**/test", "foo/bar"]
mark-changed = []
[[package-rule]]
on-affected = ["foo"]
mark-changed = ["wat"]
[[package-rule]]
on-affected = ["test1"]
mark-changed = "all"
"#;
let expected = DeterminatorRules {
use_default_rules: true,
path_rules: vec![
PathRule {
globs: vec!["all/*".to_owned()],
mark_changed: DeterminatorMarkChanged::All,
post_rule: DeterminatorPostRule::Fallthrough,
},
PathRule {
globs: vec!["all/1/2/*".to_owned()],
mark_changed: DeterminatorMarkChanged::Packages(vec!["c".to_owned()]),
post_rule: DeterminatorPostRule::SkipRules,
},
PathRule {
globs: vec!["none/**/test".to_owned(), "foo/bar".to_owned()],
mark_changed: DeterminatorMarkChanged::Packages(vec![]),
post_rule: DeterminatorPostRule::Skip,
},
],
package_rules: vec![
PackageRule {
on_affected: vec!["foo".to_string()],
mark_changed: DeterminatorMarkChanged::Packages(vec!["wat".to_string()]),
},
PackageRule {
on_affected: vec!["test1".to_string()],
mark_changed: DeterminatorMarkChanged::All,
},
],
};
assert_eq!(
DeterminatorRules::parse(s),
Ok(expected),
"parse() result matches"
);
}
#[test]
fn parse_empty() {
let expected = DeterminatorRules::default();
assert_eq!(
DeterminatorRules::parse(""),
Ok(expected),
"parse_empty() returns default"
);
}
#[test]
fn parse_bad() {
let bads = &[
// **************
// General errors
// **************
// unrecognized section
r#"[[foo]]
bar = "baz"
"#,
// unrecognized section
r#"[foo]
bar = "baz"
"#,
//
// **********
// Path rules
// **********
//
// unrecognized key
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = []
foo = "bar"
"#,
// globs is not a list
r#"[[path-rule]]
globs = "x"
mark-changed = []
"#,
// glob list doesn't have a string
r#"[[path-rule]]
globs = [123, "a/b"]
mark-changed = []
"#,
// rule totally missing
r#"[[path-rule]]
"#,
// globs missing
r#"[[path-rule]]
mark-changed = "all"
"#,
// mark-changed missing
r#"[[path-rule]]
globs = ["a/b"]
"#,
// mark-changed is an invalid string
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = "foo"
"#,
// mark-changed is not a string or list
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = 123
"#,
// mark-changed is not a list of strings
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = [123, "abc"]
"#,
// post-rule is invalid
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = []
post-rule = "abc"
"#,
// post-rule is not a string
r#"[[path-rule]]
globs = ["a/b"]
mark-changed = "all"
post-rule = []
"#,
//
// *************
// Package rules
// *************
//
// unrecognized key
r#"[[package-rule]]
on-affected = ["foo"]
mark-changed = []
foo = "bar"
"#,
// on-affected is not a list
r#"[[package-rule]]
on-affected = "foo"
mark-changed = []
"#,
// on-affected doesn't contain strings
r#"[[package-rule]]
on-affected = ["foo", 123]
mark-changed = []
"#,
// mark-changed is not a string or list
r#"[[package-rule]]
on-affected = ["foo"]
mark-changed = 123
"#,
// mark-changed is not a list of strings
r#"[[package-rule]]
on-affected = ["foo", 123]
mark-changed = ["bar", 456]
"#,
// mark-changed is an invalid string
r#"[[package-rule]]
on-affected = ["foo"]
mark-changed = "bar"
"#,
// on-affected is missing
r#"[[package-rule]]
mark-changed = "all"
"#,
// mark-changed is missing
r#"[[package-rule]]
on-affected = ["foo"]
"#,
];
for &bad in bads {
let res = DeterminatorRules::parse(bad);
if res.is_ok() {
panic!(
"parsing should have failed but succeeded:\n\
input = {}\n\
output: {:?}\n",
bad, res
);
}
}
}
}