[PATCH] clone: Warn if clone lacks LICENSE or COPYING file

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Warn cloners if there is no LICENSE* or COPYING* file that makes
the license clear.  This is a useful warning, because if there is
no license somewhere, then local copyright laws (which forbid many uses)
and terms of service apply - and the cloner may not be expecting that.
Many projects accidentally omit a license, so this is common enough to note.
For more info on the issue, feel free to see:
http://choosealicense.com/no-license/
http://www.wired.com/2013/07/github-licenses/
https://twitter.com/stephenrwalli/status/247597785069789184

Signed-off-by: David A. Wheeler <dwheeler@xxxxxxxxxxxx>
---
 builtin/clone.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/builtin/clone.c b/builtin/clone.c
index 9572467..9863b04 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -748,6 +748,41 @@ static void dissociate_from_references(void)
 		die_errno(_("cannot unlink temporary alternates file"));
 }
 
+static int starts_with_ignore_case(const char *str, const char *prefix)
+{
+	for (; ; str++, prefix++)
+		if (!*prefix)
+			return 1;
+		else if (tolower(*str) != tolower(*prefix))
+			return 0;
+}
+
+static int contains_license(void)
+{
+	DIR *dir = opendir("."); /* Examine current directory for license. */
+	struct dirent *e;
+	struct stat st;
+	int ret = 0;
+
+	if (!dir)
+		return 0;
+
+	while ((e = readdir(dir)) != NULL)
+		if (starts_with_ignore_case(e->d_name, "license") ||
+		    starts_with_ignore_case(e->d_name, "copyright")) {
+			if (stat(e->d_name, &st))
+				continue;
+			if (st.st_size > 1) {
+				ret = 1;
+				break;
+			}
+		}
+
+	closedir(dir);
+	return ret;
+}
+
+
 int cmd_clone(int argc, const char **argv, const char *prefix)
 {
 	int is_bundle = 0, is_local;
@@ -1016,6 +1051,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	junk_mode = JUNK_LEAVE_REPO;
 	err = checkout();
 
+	if (!option_no_checkout && !contains_license())
+		warning(_("Repository has no LICENSE or COPYING file with content."));
+
 	strbuf_release(&reflog_msg);
 	strbuf_release(&branch_top);
 	strbuf_release(&key);
-- 
2.1.4


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