src/cargo/ops/cargo_pkgid.rs

   1 use ops;
   2 use core::{Source, PackageIdSpec};
   3 use sources::{PathSource};
   4 use util::{CargoResult, human, Config};
   5
   6 pub fn pkgid(manifest_path: &Path,
   7              spec: Option<&str>,
   8              config: &Config) -> CargoResult<PackageIdSpec> {
   9     let mut source = try!(PathSource::for_path(&manifest_path.dir_path(),
  10                                                config));
  11     try!(source.update());
  12     let package = try!(source.root_package());
  13
  14     let lockfile = package.root().join("Cargo.lock");
  15     let source_id = package.package_id().source_id();
  16     let resolve = match try!(ops::load_lockfile(&lockfile, source_id)) {
  17         Some(resolve) => resolve,
  18         None => return Err(human("A Cargo.lock must exist for this command"))
  19     };
  20
  21     let pkgid = match spec {
  22         Some(spec) => try!(resolve.query(spec)),
  23         None => package.package_id(),
  24     };
  25     Ok(PackageIdSpec::from_package_id(pkgid))
  26 }