On Wed, Sep 03, 2025 at 03:38:04AM -0700, Karthik Nayak wrote:

Patrick Steinhardt [off-list ref] writes:

quoted

On Tue, Sep 02, 2025 at 10:34:25AM +0200, Karthik Nayak wrote:

quoted

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 24645c4653..9563abbe12 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c

@@ -1657,11 +1658,25 @@ static void ref_transaction_rejection_handler(const char *refname,
 {
 	struct ref_rejection_data *data = cb_data;

-	if (err == REF_TRANSACTION_ERROR_NAME_CONFLICT && !data->conflict_msg_shown) {
+	if (err == REF_TRANSACTION_ERROR_CREATE_EXISTS && ignore_case &&
+	    !data->case_sensitive_msg_shown) {
+		error(_("You're on a case-insensitive filesystem, and the remote you are\n"
+			"trying to fetch from has references that only differ in casing. It\n"
+			"is impossible to store such references with the 'files' backend. You\n"
+			"can either accept this as-is, in which case you won't be able to\n"
+			"store all remote references on disk. Or you can alternatively\n"
+			"migrate your repository to use the 'reftable' backend with the\n"
+			"following command:\n\n    git refs migrate --ref-format=reftable\n\n"
+			"Please keep in mind that not all implementations of Git support this\n"
+			"new format yet. So if you use tools other than Git to access this\n"
+			"repository it may not be an option to migrate to reftables.\n"));

This reads familiar :)

Which I failed to attribute to you, sorry for missing that, will add in
a 'Helped-by'.

No worries, I didn't mind it at all.

Patrick