$ git clone -n https://src.fedoraproject.org/rpms/rust-libgit2-sys0.14.git /var/lib/mock/f38-build-side-42-init-devel-1083121-29882/root/chroot_tmpdir/scmroot/rust-libgit2-sys0.14
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1083121-29882/root/chroot_tmpdir/scmroot/rust-libgit2-sys0.14'...
$ git fetch origin 1eff91fb9862416f085faf07569905e0cd8a0728:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libgit2-sys0.14
 * [new ref]         1eff91fb9862416f085faf07569905e0cd8a0728 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1eff91f Initial import (libgit2-sys 0.14 compat package)