credential.c: store "wwwauth[]" values in credential_read()

Teach git-credential to read "wwwauth[]" value(s) when parsing the
output of a credential helper.

These extra headers are not needed for Git's own HTTP support to use the
feature internally, but the feature would not be available for a
scripted caller (say, git-remote-mediawiki providing the header in the
same way).

As a bonus, this also makes it easier to use wwwauth[] in synthetic
credential inputs in our test suite.

Co-authored-by: Jeff King <[email protected]>
Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: 2 people

credential.c

@@ -238,6 +238,8 @@ int credential_read(struct credential *c, FILE *fp)
 		} else if (!strcmp(key, "path")) {
 			free(c->path);
 			c->path = xstrdup(value);
+		} else if (!strcmp(key, "wwwauth[]")) {
+			strvec_push(&c->wwwauth_headers, value);
 		} else if (!strcmp(key, "password_expiry_utc")) {
 			errno = 0;
 			c->password_expiry_utc = parse_timestamp(value, NULL, 10);