$ git clone -n https://src.fedoraproject.org/rpms/rust-ucs2.git /var/lib/mock/f45-build-45834-828/root/chroot_tmpdir/scmroot/rust-ucs2
Cloning into '/var/lib/mock/f45-build-45834-828/root/chroot_tmpdir/scmroot/rust-ucs2'...
$ git fetch origin 1ec9a60f8e9adb5681b49450bd2cacc145730aa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ucs2
 * [new ref]         1ec9a60f8e9adb5681b49450bd2cacc145730aa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ec9a60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild