Re: [PATCH v10 5/6] fsmonitor: check for compatability before communicating with fsmonitor

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On 9/20/22 4:33 PM, Eric DeCosta via GitGitGadget wrote:
From: Eric DeCosta <edecosta@xxxxxxxxxxxxx>

If fsmonitor is not in a compatible state, die with an appropriate error
messge.
[...]
diff --git a/fsmonitor-settings.c b/fsmonitor-settings.c
index 531a1b6f956..24480b9806d 100644
--- a/fsmonitor-settings.c
+++ b/fsmonitor-settings.c
[...]
+char *fsm_settings__get_incompatible_msg(struct repository *r,
  					 enum fsmonitor_reason reason)
  {
  	struct strbuf msg = STRBUF_INIT;
+	const char *socket_dir;
switch (reason) {
  	case FSMONITOR_REASON_UNTESTED:
@@ -281,9 +283,11 @@ char *fsm_settings__get_incompatible_msg(const struct repository *r,
  		goto done;
case FSMONITOR_REASON_NOSOCKETS:
+		socket_dir = dirname((char *)fsmonitor_ipc__get_path(r));
  		strbuf_addf(&msg,
-			    _("repository '%s' is incompatible with fsmonitor due to lack of Unix sockets"),
-			    r->worktree);
+			    _("socket directory '%s' is incompatible with fsmonitor due"),
+			    socket_dir);
+		strbuf_add(&msg, _(" to lack of Unix sockets support"), 32);
  		goto done;

I don't think we should split the error message between two
calls to strbuf_add().  I realize that this was probably done
because of line length concerns.  But this makes assumptions
on language word order during translations.

Instead, we can use C string literal joining before passing
it to the translation macro.  Something like:

	strbuf_addf(&msg,
		_("socket directory '%s' is incompatible with "
		  "fsmonitor due to lack of Unix sockets support"),
		socket_dir);

[...]
diff --git a/fsmonitor.c b/fsmonitor.c
index 57d6a483bee..43d580132fb 100644
--- a/fsmonitor.c
+++ b/fsmonitor.c
@@ -305,6 +305,10 @@ void refresh_fsmonitor(struct index_state *istate)
  	int is_trivial = 0;
  	struct repository *r = istate->repo ? istate->repo : the_repository;
  	enum fsmonitor_mode fsm_mode = fsm_settings__get_mode(r);
+	enum fsmonitor_reason reason = fsm_settings__get_reason(r);
+
+	if (reason > FSMONITOR_REASON_OK)
+		die("%s", fsm_settings__get_incompatible_msg(r, reason));

We don't want to call die() here.  Maybe just silently return
without doing anything or issue a warning() and return.  (But
I'm favoring a silent return here.)

From the clients' (`git status`, `git diff`, etc.) point of view,
they just want a speed-up, if possible, but we shouldn't kill them;
we should just let them do the normal scan that would have done
if the feature were turned off.

Jeff



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