1 files changed, 45 insertions, 0 deletions
diff --git a/debian/scripts/guess-crate-copyright b/debian/scripts/guess-crate-copyright
new file mode 100755
index 0000000..15f35f6
--- /dev/null
+++ b/debian/scripts/guess-crate-copyright
@@ -0,0 +1,45 @@
+#!/usr/bin/python3
+# Copyright: 2015-2017 The Debian Project
+# License: MIT or Apache-2.0
+#
+# Guess the copyright of a cargo crate by looking at its git history.
+
+import datetime
+import toml
+import os
+import subprocess
+import sys
+
+this_year = datetime.datetime.now().year
+crates = sys.argv[1:]
+get_initial_commit = len(crates) == 1
+
+for crate in crates:
+	with open(os.path.join(crate, "Cargo.toml")) as fp:
+		data = toml.load(fp)
+		repo = data["package"].get("repository", None)
+		if get_initial_commit and repo:
+			output = subprocess.check_output(
+				"""git clone -q --bare "%s" tmp.crate-copyright >&2 &&
+cd tmp.crate-copyright &&
+git log --format=%%cI --reverse | head -n1 | cut -b1-4 &&
+git log --format=%%cI           | head -n1 | cut -b1-4 &&
+cd .. &&
+rm -rf tmp.crate-copyright""" % repo, shell=True).decode("utf-8")
+			first_year, last_year = output.strip().split(maxsplit=2)
+		else:
+			first_year = "20XX"
+			last_year = this_year
+
+		authors = data["package"].get("authors", ["UNKNOWN AUTHORS"])
+
+		print("""Files: {0}
+Copyright: {1}
+License: {2}
+Comment: see {3}
+""".format(
+		os.path.join(crate, "*"),
+		"\n           ".join("%s-%s %s" % (first_year, last_year, a.replace(" <>", "")) for a in authors),
+		data["package"].get("license", "???").replace("/", " or "),
+		repo or "???"
+	))