Allow '+', '-' and '.' in remote helper names

According to relevant RFCs, in addition to alphanumerics, the following
characters are valid in URL scheme parts: '+', '-' and '.', but
currently only alphanumerics are allowed in remote helper names.

Allow those three characters in remote helper names (both 'foo://' and
'foo::' syntax).

Signed-off-by: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/transport.c b/transport.c
index 3846aacb476b552cefddd8774b9a055e353b6ebc..d3ec44985994df66fc7e1eeb401b289055dd0f19 100644 (file)
--- a/transport.c
+++ b/transport.c
@@ -872,6 +872,21 @@ static int is_file(const char *url)
        return S_ISREG(buf.st_mode);
 }
 
+static int isurlschemechar(int first_flag, int ch)
+{
+       /*
+        * The set of valid URL schemes, as per STD66 (RFC3986) is
+        * '[A-Za-z][A-Za-z0-9+.-]*'. But use sightly looser check
+        * of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
+        * of check used '[A-Za-z0-9]+' so not to break any remote
+        * helpers.
+        */
+       int alphanumeric, special;
+       alphanumeric = ch > 0 && isalnum(ch);
+       special = ch == '+' || ch == '-' || ch == '.';
+       return alphanumeric || (!first_flag && special);
+}
+
 static int is_url(const char *url)
 {
        const char *url2, *first_slash;
@@ -896,7 +911,7 @@ static int is_url(const char *url)
         */
        url2 = url;
        while (url2 < first_slash - 1) {
-               if (!isalnum((unsigned char)*url2))
+               if (!isurlschemechar(url2 == url, (unsigned char)*url2))
                        return 0;
                url2++;
        }
@@ -929,7 +944,7 @@ struct transport *transport_get(struct remote *remote, const char *url)
        if (url) {
                const char *p = url;
 
-               while (isalnum(*p))
+               while (isurlschemechar(p == url, *p))
                        p++;
                if (!prefixcmp(p, "::"))
                        helper = xstrndup(url, p - url);