$ git clone -n https://src.fedoraproject.org/rpms/libsigsegv.git /var/lib/mock/f45-build-16986-494/root/chroot_tmpdir/scmroot/libsigsegv
Cloning into '/var/lib/mock/f45-build-16986-494/root/chroot_tmpdir/scmroot/libsigsegv'...
$ git fetch origin c6e5a82f3393931099f2db11ecffec10c3371d37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsigsegv
 * [new ref]         c6e5a82f3393931099f2db11ecffec10c3371d37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6e5a82 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild