Handle http.* config variables pointing to files gracefully on Windows

On Windows, we would like to be able to have a default http.sslCAinfo
that points to an MSys path (i.e. relative to the installation root of
Git).  As Git is a MinGW program, it has to handle the conversion
of the MSys path into a MinGW32 path itself.

Since system_path() considers paths starting with '/' as absolute, we
have to convince it to make a Windows path by stripping the leading
slash.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

http.c

@@ -8,6 +8,7 @@
 #include "credential.h"
 #include "version.h"
 #include "pkt-line.h"
+#include "exec_cmd.h"
 
 int active_requests;
 int http_is_verbose;
@@ -147,24 +148,36 @@ static void process_curl_messages(void)
 }
 #endif
 
+static int git_config_path(const char **result,
+		const char *var, const char *value)
+{
+	if (git_config_string(result, var, value))
+		return 1;
+#ifdef __MINGW32__
+	if (**result == '/')
+		*result = system_path((*result) + 1);
+#endif
+	return 0;
+}
+
 static int http_options(const char *var, const char *value, void *cb)
 {
 	if (!strcmp("http.sslverify", var)) {
 		curl_ssl_verify = git_config_bool(var, value);
 		return 0;
 	}
 	if (!strcmp("http.sslcert", var))
-		return git_config_string(&ssl_cert, var, value);
+		return git_config_path(&ssl_cert, var, value);
 #if LIBCURL_VERSION_NUM >= 0x070903
 	if (!strcmp("http.sslkey", var))
-		return git_config_string(&ssl_key, var, value);
+		return git_config_path(&ssl_key, var, value);
 #endif
 #if LIBCURL_VERSION_NUM >= 0x070908
 	if (!strcmp("http.sslcapath", var))
-		return git_config_string(&ssl_capath, var, value);
+		return git_config_path(&ssl_capath, var, value);
 #endif
 	if (!strcmp("http.sslcainfo", var))
-		return git_config_string(&ssl_cainfo, var, value);
+		return git_config_path(&ssl_cainfo, var, value);
 	if (!strcmp("http.sslcertpasswordprotected", var)) {
 		ssl_cert_password_required = git_config_bool(var, value);
 		return 0;