git-p4: Unset P4DIFF environment variable when using 'p4 -du diff'

diff --git a/builtin-tag.c b/builtin-tag.c
index 28c36fdcd1658968ff7c3e2f1d6ba6f364f99592..8dd959fe1c74507023f8e82c7f4682c1588ebac6 100644 (file)
--- a/builtin-tag.c
+++ b/builtin-tag.c
@@ -50,12 +50,15 @@ void launch_editor(const char *path, struct strbuf *buffer, const char *const *e
                size_t len = strlen(editor);
                int i = 0;
                const char *args[6];
+               struct strbuf arg0;
 
+               strbuf_init(&arg0, 0);
                if (strcspn(editor, "$ \t'") != len) {
                        /* there are specials */
+                       strbuf_addf(&arg0, "%s \"$@\"", editor);
                        args[i++] = "sh";
                        args[i++] = "-c";
-                       args[i++] = "$0 \"$@\"";
+                       args[i++] = arg0.buf;
                }
                args[i++] = editor;
                args[i++] = path;
@@ -63,6 +66,7 @@ void launch_editor(const char *path, struct strbuf *buffer, const char *const *e
 
                if (run_command_v_opt_cd_env(args, 0, NULL, env))
                        die("There was a problem with the editor %s.", editor);
+               strbuf_release(&arg0);
        }
 
        if (!buffer)