$ git clone -n https://src.fedoraproject.org/rpms/ghc-stringbuilder.git /var/lib/mock/f45-build-10811-424/root/chroot_tmpdir/scmroot/ghc-stringbuilder
Cloning into '/var/lib/mock/f45-build-10811-424/root/chroot_tmpdir/scmroot/ghc-stringbuilder'...
$ git fetch origin 59a394dadcabd194146c2214b78686d65a06736a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-stringbuilder
 * [new ref]         59a394dadcabd194146c2214b78686d65a06736a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59a394d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild