$ git clone -n https://src.fedoraproject.org/rpms/trac.git /var/lib/mock/f45-build-55282-942/root/chroot_tmpdir/scmroot/trac
Cloning into '/var/lib/mock/f45-build-55282-942/root/chroot_tmpdir/scmroot/trac'...
$ git fetch origin 006a0e765bc2c08a67f4bc84d5e89b22e78b9ef8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trac
 * [new ref]         006a0e765bc2c08a67f4bc84d5e89b22e78b9ef8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 006a0e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild