$ git clone -n https://src.fedoraproject.org/rpms/rust-asyncgit.git /var/lib/mock/f40-build-2482477-61635/root/chroot_tmpdir/scmroot/rust-asyncgit
Cloning into '/var/lib/mock/f40-build-2482477-61635/root/chroot_tmpdir/scmroot/rust-asyncgit'...
$ git fetch origin 1f3642ff4318bc5ccaa4f4298ae24b0592aff65f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-asyncgit
 * [new ref]         1f3642ff4318bc5ccaa4f4298ae24b0592aff65f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f3642f Bump git2 dependency from 0.17 to 0.18