$ git clone -n https://src.fedoraproject.org/rpms/rust-titlecase.git /var/lib/mock/f42-build-side-1-3533355-46361/root/chroot_tmpdir/scmroot/rust-titlecase
Cloning into '/var/lib/mock/f42-build-side-1-3533355-46361/root/chroot_tmpdir/scmroot/rust-titlecase'...
$ git fetch origin 5949450c4f59edca417addb0e34086809748e797:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-titlecase
 * [new ref]         5949450c4f59edca417addb0e34086809748e797 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5949450 Update to version 3.5.0; Fixes RHBZ#2358259