Adding environment variable CARGO_PKG_LICENSE

Fixes #8024

Author: kerkmann

src/cargo/core/compiler/compilation.rs

@@ -289,6 +289,10 @@ impl<'cfg> Compilation<'cfg> {
                 "CARGO_PKG_REPOSITORY",
                 metadata.repository.as_ref().unwrap_or(&String::new()),
             )
+            .env(
+                "CARGO_PKG_LICENSE",
+                metadata.license.as_ref().unwrap_or(&String::new()),
+            )
             .env("CARGO_PKG_AUTHORS", &pkg.authors().join(":"))
             .cwd(pkg.root());
         Ok(cmd)

src/doc/src/reference/environment-variables.md

@@ -184,6 +184,7 @@ let version = env!("CARGO_PKG_VERSION");
 * `CARGO_PKG_DESCRIPTION` — The description from the manifest of your package.
 * `CARGO_PKG_HOMEPAGE` — The home page from the manifest of your package.
 * `CARGO_PKG_REPOSITORY` — The repository from the manifest of your package.
+* `CARGO_PKG_LICENSE` — The license from the manifest of your package.
 * `OUT_DIR` — If the package has a build script, this is set to the folder where the build
               script should place its output. See below for more information.
               (Only set during compilation.)

tests/testsuite/build.rs

@@ -1230,6 +1230,7 @@ fn crate_env_vars() {
         homepage = "https://example.com"
         repository = "https://example.com/repo.git"
         authors = ["wycats@example.com"]
+        license = "MIT"
         "#,
         )
         .file(
@@ -1247,6 +1248,7 @@ fn crate_env_vars() {
             static PKG_NAME: &'static str = env!("CARGO_PKG_NAME");
             static HOMEPAGE: &'static str = env!("CARGO_PKG_HOMEPAGE");
             static REPOSITORY: &'static str = env!("CARGO_PKG_REPOSITORY");
+            static LICENSE: &'static str = env!("CARGO_PKG_LICENSE");
             static DESCRIPTION: &'static str = env!("CARGO_PKG_DESCRIPTION");
 
             fn main() {
@@ -1258,6 +1260,7 @@ fn crate_env_vars() {
                  assert_eq!("foo", PKG_NAME);
                  assert_eq!("https://example.com", HOMEPAGE);
                  assert_eq!("https://example.com/repo.git", REPOSITORY);
+                 assert_eq!("MIT", LICENSE);
                  assert_eq!("This is foo", DESCRIPTION);
                 let s = format!("{}.{}.{}-{}", VERSION_MAJOR,
                                 VERSION_MINOR, VERSION_PATCH, VERSION_PRE);