$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-compress.git /var/lib/mock/f42-build-3403671-45135/root/chroot_tmpdir/scmroot/apache-commons-compress
Cloning into '/var/lib/mock/f42-build-3403671-45135/root/chroot_tmpdir/scmroot/apache-commons-compress'...
$ git fetch origin 591442ea15ca34e7da44b0f2657a7e7c519b6627:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-compress
 * [new ref]         591442ea15ca34e7da44b0f2657a7e7c519b6627 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 591442e Remove javadoc subpackage