$ git clone -n https://src.fedoraproject.org/rpms/libgit2-glib.git /var/lib/mock/f41-build-855883-167429/root/chroot_tmpdir/scmroot/libgit2-glib
Cloning into '/var/lib/mock/f41-build-855883-167429/root/chroot_tmpdir/scmroot/libgit2-glib'...
$ git fetch origin a9821d37d308c1869c5bf785f672d09bfce6b673:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgit2-glib
 * [new ref]         a9821d37d308c1869c5bf785f672d09bfce6b673 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9821d3 Rebuild for libgit2 1.8.x