$ git clone -n https://src.fedoraproject.org/rpms/rust-schemars.git /var/lib/mock/f40-build-2288212-55773/root/chroot_tmpdir/scmroot/rust-schemars
Cloning into '/var/lib/mock/f40-build-2288212-55773/root/chroot_tmpdir/scmroot/rust-schemars'...
$ git fetch origin 7d64b9da0dcf8f6ea927fb7cb6c6573b16f64815:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-schemars
 * [new ref]         7d64b9da0dcf8f6ea927fb7cb6c6573b16f64815 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d64b9d Initial import (#2246014)