Junio C Hamano <gitster@xxxxxxxxx> 于2021年3月23日周二 下午2:19写道：
>
> Christian Couder <christian.couder@xxxxxxxxx> writes:
>
> > If you want nothing to happen when $ARG isn't set, you can change the
> > config option to something like:
> >
> > $ git config trailer.sign.command "NAME='\$ARG'; test -n \"\$NAME\" &&
> > git log --author=\"\$NAME\" -1 --format='format:%aN <%aE>' || true"
> >
> > (This is because it looks like $ARG is replaced only once with the
> > actual value, which is perhaps a bug. Otherwise something like the
> > following might work:
>
> I do not know the origin of that code in trailers.c but it feels
> quite confused and error prone to use textual replacement with
> strbuf_replace(). Why doesn't the code, which knows it will use
> shell to execute the command line given by the end user in the
> configuration, to just export ARG as an environment variable and
> be done with it? It would also avoid quoting problem etc.
>
Maybe like this?
-#define TRAILER_ARG_STRING "$ARG"
-
static const char *git_generated_prefixes[] = {
"Signed-off-by: ",
"(cherry picked from commit ",
@@ -222,13 +220,17 @@ static char *apply_command(const char *command,
const char *arg)
struct strbuf buf = STRBUF_INIT;
struct child_process cp = CHILD_PROCESS_INIT;
char *result;
+ const char *const *var;
strbuf_addstr(&cmd, command);
- if (arg)
- strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
+ for (var = local_repo_env; *var; var++)
+ strvec_push(&cp.env_array, *var);
+ if (arg) {
+ strvec_pushf(&cp.env_array, "ARG=%s", arg);
+ }
strvec_push(&cp.args, cmd.buf);
- cp.env = local_repo_env;
+
cp.no_stdin = 1;
cp.use_shell = 1;
