From c561328ce17d0c94d073d41bf45d2422fdf57ce7 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@amazon.com>
Date: Aug 06 2024 05:03:34 +0000
Subject: Add an action to retrieve the SPDX license string from a crate


This is useful for a script I'm writing to collect all the bundled
crate licenses for centos-style vendored crates

Signed-off-by: Benjamin Herrenschmidt <benh@amazon.com>

---

diff --git a/cargo2rpm/__main__.py b/cargo2rpm/__main__.py
index 635eb31..9cbd9bb 100644
--- a/cargo2rpm/__main__.py
+++ b/cargo2rpm/__main__.py
@@ -170,6 +170,23 @@ def main():
                 break_the_build(str(exc))
                 exit(1)
 
+        case "license":
+            try:
+                metadata = Metadata.from_cargo(args.path)
+
+                if metadata.is_workspace():
+                    print("Cannot determine crate license from a cargo workspace.", file=sys.stderr)
+                    # exit code 1 will fail package scriptlets
+                    exit(1)
+
+                print(metadata.packages[0].license)
+                exit(0)
+
+            except subprocess.CalledProcessError as exc:
+                # catch the exception to ensure stdout and stderr are printed
+                print(pretty_called_process_error(exc), file=sys.stderr)
+                exit(1)
+
         case "parse-vendor-manifest":
             try:
                 action_parse_vendor_manifest(args)
diff --git a/cargo2rpm/cli.py b/cargo2rpm/cli.py
index 27bc057..b50a0a8 100644
--- a/cargo2rpm/cli.py
+++ b/cargo2rpm/cli.py
@@ -59,6 +59,9 @@ def get_args(args=None):
     )
     action_parse_vendor_manifest.set_defaults(action="parse-vendor-manifest")
 
+    action_license = action_parsers.add_parser("license", help="Print the license of the current crate.")
+    action_license.set_defaults(action="license")
+
     if args:
         return parser.parse_args(args)
     else:  # pragma nocover