$ git clone -n https://src.fedoraproject.org/rpms/syncthing.git /var/lib/mock/f41-build-847700-164042/root/chroot_tmpdir/scmroot/syncthing
Cloning into '/var/lib/mock/f41-build-847700-164042/root/chroot_tmpdir/scmroot/syncthing'...
$ git fetch origin 2c25bc5d13d5924bf02d0d13e00b8f2bc7f61299:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/syncthing
 * [new ref]         2c25bc5d13d5924bf02d0d13e00b8f2bc7f61299 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c25bc5 Update to version 1.27.12; Fixes RHBZ#2303591