$ git clone -n https://src.fedoraproject.org/rpms/libextractor.git /var/lib/mock/f41-build-815474-149534/root/chroot_tmpdir/scmroot/libextractor
Cloning into '/var/lib/mock/f41-build-815474-149534/root/chroot_tmpdir/scmroot/libextractor'...
$ git fetch origin fd7a593b7831e712f6791595d42f58bffe0c3f9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libextractor
 * [new ref]         fd7a593b7831e712f6791595d42f58bffe0c3f9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd7a593 Add missing gnu-keyring.gpg