$ git clone -n https://src.fedoraproject.org/rpms/rust-unic-ucd-common.git /var/lib/mock/f45-build-45901-829/root/chroot_tmpdir/scmroot/rust-unic-ucd-common
Cloning into '/var/lib/mock/f45-build-45901-829/root/chroot_tmpdir/scmroot/rust-unic-ucd-common'...
$ git fetch origin dbf5c82c59f225d6b7bf9e23f4b634bad71bf4c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unic-ucd-common
 * [new ref]         dbf5c82c59f225d6b7bf9e23f4b634bad71bf4c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbf5c82 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild