$ git clone -n https://src.fedoraproject.org/rpms/libgit2_1.7.git /var/lib/mock/f41-build-850185-165157/root/chroot_tmpdir/scmroot/libgit2_1.7
Cloning into '/var/lib/mock/f41-build-850185-165157/root/chroot_tmpdir/scmroot/libgit2_1.7'...
$ git fetch origin 97db669415d3a9812eb9eae0ef19ef0276dcd445:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgit2_1.7
 * [new ref]         97db669415d3a9812eb9eae0ef19ef0276dcd445 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97db669 Initial import