$ git clone -n https://src.fedoraproject.org/rpms/txt2regex.git /var/lib/mock/f45-build-37542-715/root/chroot_tmpdir/scmroot/txt2regex
Cloning into '/var/lib/mock/f45-build-37542-715/root/chroot_tmpdir/scmroot/txt2regex'...
$ git fetch origin 18043b317f47877a9cd097e035dc505dd7000d8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/txt2regex
 * [new ref]         18043b317f47877a9cd097e035dc505dd7000d8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18043b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild