$ git clone -n https://src.fedoraproject.org/rpms/rust-libgit2-sys0.13.git /var/lib/mock/f38-build-side-42-init-devel-1392109-30890/root/chroot_tmpdir/scmroot/rust-libgit2-sys0.13
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1392109-30890/root/chroot_tmpdir/scmroot/rust-libgit2-sys0.13'...
$ git fetch origin 106cb42da568cfa2b4e823dee4d3b834c6f6b5df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libgit2-sys0.13
 * [new ref]         106cb42da568cfa2b4e823dee4d3b834c6f6b5df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 106cb42 Initial import (libgit2-sys 0.13 compat package)