$ git clone -n https://src.fedoraproject.org/rpms/libextractor.git /var/lib/mock/f45-build-16150-483/root/chroot_tmpdir/scmroot/libextractor
Cloning into '/var/lib/mock/f45-build-16150-483/root/chroot_tmpdir/scmroot/libextractor'...
$ git fetch origin b5ca0d7e72ea144730240ddb08e10abc770d0ae8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libextractor
 * [new ref]         b5ca0d7e72ea144730240ddb08e10abc770d0ae8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5ca0d7 1.19