$ git clone -n https://src.fedoraproject.org/rpms/rust-gh-emoji.git /var/lib/mock/f45-build-41894-786/root/chroot_tmpdir/scmroot/rust-gh-emoji
Cloning into '/var/lib/mock/f45-build-41894-786/root/chroot_tmpdir/scmroot/rust-gh-emoji'...
$ git fetch origin fabdfc9052b27a71492ce269b5ee494c127cb1af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gh-emoji
 * [new ref]         fabdfc9052b27a71492ce269b5ee494c127cb1af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fabdfc9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild