$ git clone -n https://src.fedoraproject.org/rpms/libsecp256k1.git /var/lib/mock/f45-build-16934-493/root/chroot_tmpdir/scmroot/libsecp256k1
Cloning into '/var/lib/mock/f45-build-16934-493/root/chroot_tmpdir/scmroot/libsecp256k1'...
$ git fetch origin ae0adaafc9264b38aa686f1ab8cf539357f435d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsecp256k1
 * [new ref]         ae0adaafc9264b38aa686f1ab8cf539357f435d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae0adaa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild