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// Copyright 2026 VKrishna04
// SPDX-License-Identifier: Apache-2.0
// vcpkg adapter, for C and C++ projects in manifest mode.
//
// Opt-in, for the same reason as Cargo, Gradle, Maven and SwiftPM: `vcpkg_installed/`
// is not a downloaded dependency tree. vcpkg builds every port from source, so what is
// in there is headers and compiled libraries, and `vcpkg install` puts them back by
// compiling them again — Boost or Qt is an afternoon, not a download. The binary cache
// beside the vcpkg installation often turns that back into a copy, but nothing here can
// prove it holds an archive matching this project's triplet and ABI, so the adapter
// assumes the expensive answer and the engine holds it to `build_idle_days`.
//
// Manifest mode only, which is the mode that puts anything inside a repository at all:
// classic mode installs into one tree beside vcpkg itself, shared by every project on
// the machine. `devp caches` reports that one instead.
use super::{BloatDir, EnforcePolicy, PackageManager, dir_size};
use anyhow::{Result, anyhow};
use std::fs;
use std::path::Path;
/// vcpkg adapter. Opt-in; see the module comment.
pub struct Vcpkg;
impl PackageManager for Vcpkg {
fn name(&self) -> &'static str {
"vcpkg"
}
fn detect(&self, path: &Path) -> bool {
path.join("vcpkg.json").exists()
}
/// `vcpkg_installed/`, which vcpkg creates beside the manifest it read. `build/` next
/// to it belongs to CMake, and the name alone never says whose it is.
fn bloat_dirs(&self, path: &Path) -> Vec<BloatDir> {
let installed = path.join("vcpkg_installed");
if !installed.is_dir() {
return Vec::new();
}
vec![BloatDir {
name: "vcpkg_installed".to_string(),
path: installed.clone(),
size_bytes: dir_size(&installed),
shared_bytes: 0,
}]
}
/// The manifest is the proof, as it is for Maven and SwiftPM — with one extra
/// condition. `vcpkg.json` is also the file every *port* carries, and a port manifest
/// describes a package rather than an installation: nothing rebuilds a
/// `vcpkg_installed/` from it. What separates the two is a `dependencies` list, so
/// that is what is checked. A manifest declaring nothing to install cannot account
/// for the directory beside it either, which is the same refusal for a different
/// reason.
///
/// Running `vcpkg install --dry-run` here instead would need a registry checkout and
/// a network fetch in the middle of a delete pass, for no stronger answer than "the
/// file that rebuilds this is present and names dependencies".
fn enforce_lockfile(&self, path: &Path, _policy: EnforcePolicy) -> Result<()> {
let manifest = path.join("vcpkg.json");
let raw = fs::read_to_string(&manifest).map_err(|e| {
anyhow!(
"`vcpkg.json` could not be read ({e}) — nothing to rebuild `vcpkg_installed/` from."
)
})?;
let json: serde_json::Value = serde_json::from_str(&raw).map_err(|e| {
anyhow!(
"`vcpkg.json` is not valid JSON ({e}) — `vcpkg install` could not read it either."
)
})?;
let declares_dependencies = json
.get("dependencies")
.and_then(|d| d.as_array())
.is_some_and(|d| !d.is_empty());
if !declares_dependencies {
return Err(anyhow!(
"`vcpkg.json` declares no `dependencies` — refusing to treat \
`vcpkg_installed/` as rebuildable from it."
));
}
Ok(())
}
fn restore(&self, _path: &Path, _timeout: std::time::Duration) -> Result<()> {
println!("vcpkg vcpkg_installed/ will regenerate on the next `vcpkg install`");
Ok(())
}
fn lockfiles(&self) -> &'static [&'static str] {
&["vcpkg.json"]
}
fn opt_in(&self) -> bool {
true
}
}
#[cfg(test)]
mod tests {
use super::*;
use tempfile::tempdir;
fn manifest(dir: &Path, body: &str) {
fs::write(dir.join("vcpkg.json"), body).unwrap();
}
fn enforced(dir: &Path) -> Result<()> {
Vcpkg.enforce_lockfile(dir, EnforcePolicy::default())
}
#[test]
fn detects_on_the_manifest() {
let dir = tempdir().unwrap();
assert!(!Vcpkg.detect(dir.path()));
manifest(dir.path(), r#"{"dependencies":["fmt"]}"#);
assert!(Vcpkg.detect(dir.path()));
}
#[test]
fn claims_the_manifest_install_tree_and_nothing_else() {
// `build/` beside a vcpkg manifest is CMake's, and a directory named `build` is
// as often a hand-written one as a generated one. Claiming it on the name would
// be the guess this project does not make.
let dir = tempdir().unwrap();
fs::create_dir(dir.path().join("vcpkg_installed")).unwrap();
fs::create_dir(dir.path().join("build")).unwrap();
let names: Vec<String> = Vcpkg
.bloat_dirs(dir.path())
.into_iter()
.map(|b| b.name)
.collect();
assert_eq!(names, vec!["vcpkg_installed"]);
}
#[test]
fn a_port_manifest_is_not_an_installation() {
// Every vcpkg *port* carries a `vcpkg.json` too. It describes a package rather
// than an install root, so nothing rebuilds a `vcpkg_installed/` from it and a
// port directory that happens to hold one must not be pruned under it.
let dir = tempdir().unwrap();
manifest(dir.path(), r#"{"name":"fmt","version":"10.1.1"}"#);
assert!(enforced(dir.path()).is_err());
}
#[test]
fn a_missing_empty_or_unreadable_manifest_is_refused() {
let dir = tempdir().unwrap();
assert!(enforced(dir.path()).is_err(), "no manifest at all");
manifest(dir.path(), "{ not json");
assert!(enforced(dir.path()).is_err(), "unparseable manifest");
manifest(dir.path(), r#"{"dependencies":[]}"#);
assert!(
enforced(dir.path()).is_err(),
"an empty dependency list rebuilds nothing"
);
}
#[test]
fn a_manifest_with_dependencies_is_the_proof() {
let dir = tempdir().unwrap();
manifest(
dir.path(),
r#"{"dependencies":["fmt","zlib"],
"builtin-baseline":"3426db05b996481ca31e95fff3734cf23e0f51bc"}"#,
);
assert!(enforced(dir.path()).is_ok());
// The object form is what a dependency with features or a host requirement looks
// like, and it is commoner than the bare string in manifests that pull anything
// substantial.
manifest(
dir.path(),
r#"{"dependencies":[{"name":"boost-asio","features":["ssl"]}]}"#,
);
assert!(enforced(dir.path()).is_ok());
}
#[test]
fn vcpkg_is_opt_in() {
assert!(Vcpkg.opt_in());
}
}