$ git clone -n https://src.fedoraproject.org/rpms/rust-jwalk.git /var/lib/mock/f45-build-42744-796/root/chroot_tmpdir/scmroot/rust-jwalk
Cloning into '/var/lib/mock/f45-build-42744-796/root/chroot_tmpdir/scmroot/rust-jwalk'...
$ git fetch origin 5f13c108d666f7f824a503f63dc2a355ce8aa89c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-jwalk
 * [new ref]         5f13c108d666f7f824a503f63dc2a355ce8aa89c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f13c10 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild