git-proxy updates.

This builds on top of the git-proxy mechanism Paul Collins did,
and updates its configuration mechanism.

 * GIT_PROXY_COMMAND environment variable is used as the
   catch-all fallback, as in the original.  This has not
   changed.

 * Renames proxy configuration variables to core.gitproxy; this
   has become a multi-value variable per list discussion, most
   notably from suggestion by Linus.

	[core]
	;# matches www.kernel.org as well
	gitproxy = netcatter for kernel.org
	gitproxy = netscatter for sample.xz
	gitproxy = none for mydomain.xz
	gitproxy = netcatter-default

   The values are command names, followed by an optional " for "
   and domainname; the first tail-match of the domainname
   determines which proxy command is used.  An entry without "
   for " matches any domain and can be used as the default.

   The command name "none" is special -- it tells the mechanism
   not to use any proxy command and use the native git://
   connection.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/connect.c b/connect.c
index be88ef0..a4d6d35 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -449,25 +449,63 @@ static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 #endif /* NO_IPV6 */
 
 static char *git_proxy_command = NULL;
+static const char *rhost_name = NULL;
+static int rhost_len;
 
 static int git_proxy_command_options(const char *var, const char *value)
 {
-       if (git_proxy_command == NULL) {
-               if (!strcmp(var, "git.proxycommand")) {
-                       git_proxy_command = xmalloc(strlen(value) + 1);
-                       strcpy(git_proxy_command, value);
+       if (!strcmp(var, "core.gitproxy")) {
+               if (git_proxy_command)
                        return 0;
+               /* [core]
+                * ;# matches www.kernel.org as well
+                * gitproxy = netcatter-1 for kernel.org
+                * gitproxy = netcatter-2 for sample.xz
+                * gitproxy = netcatter-default
+                */
+               const char *for_pos = strstr(value, " for ");
+               int matchlen = -1;
+               int hostlen;
+
+               if (!for_pos)
+                       /* matches everybody */
+                       matchlen = strlen(value);
+               else {
+                       hostlen = strlen(for_pos + 5);
+                       if (rhost_len < hostlen)
+                               matchlen = -1;
+                       else if (!strncmp(for_pos + 5,
+                                         rhost_name + rhost_len - hostlen,
+                                         hostlen) &&
+                                ((rhost_len == hostlen) ||
+                                 rhost_name[rhost_len - hostlen -1] == '.'))
+                               matchlen = for_pos - value;
+                       else
+                               matchlen = -1;
                }
+               if (0 <= matchlen) {
+                       /* core.gitproxy = none for kernel.org */
+                       if (matchlen == 4 && 
+                           !memcmp(value, "none", 4))
+                               matchlen = 0;
+                       git_proxy_command = xmalloc(matchlen + 1);
+                       memcpy(git_proxy_command, value, matchlen);
+                       git_proxy_command[matchlen] = 0;
+               }
+               return 0;
        }
 
        return git_default_config(var, value);
 }
 
-static int git_use_proxy(void)
+static int git_use_proxy(const char *host)
 {
+       rhost_name = host;
+       rhost_len = strlen(host);
        git_proxy_command = getenv("GIT_PROXY_COMMAND");
        git_config(git_proxy_command_options);
-       return git_proxy_command != NULL;
+       rhost_name = NULL;
+       return (git_proxy_command && *git_proxy_command);
 }
 
 static int git_proxy_connect(int fd[2], const char *prog, char *host, char *path)
@@ -561,7 +599,7 @@ int git_connect(int fd[2], char *url, const char *prog)
        }
 
        if (protocol == PROTO_GIT) {
-               if (git_use_proxy())
+               if (git_use_proxy(host))
                        return git_proxy_connect(fd, prog, host, path);
                return git_tcp_connect(fd, prog, host, path);
        }