$ git clone -n https://src.fedoraproject.org/rpms/perl-Symbol-Get.git /var/lib/mock/f45-build-26379-617/root/chroot_tmpdir/scmroot/perl-Symbol-Get
Cloning into '/var/lib/mock/f45-build-26379-617/root/chroot_tmpdir/scmroot/perl-Symbol-Get'...
$ git fetch origin ee3c4ffe1f2a71c077f952a7412f342f468a5903:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Symbol-Get
 * [new ref]         ee3c4ffe1f2a71c077f952a7412f342f468a5903 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee3c4ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild