$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.3-incoming-8902-27842/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.3-incoming-8902-27842/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 49f2f9e343144bb36e79b4108971878d117002c7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             49f2f9e343144bb36e79b4108971878d117002c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49f2f9e34 Backport ACPI NULL dereference fix