$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk-portable.git /var/lib/mock/f39-build-1693437-41148/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable
Cloning into '/var/lib/mock/f39-build-1693437-41148/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable'...
$ git fetch origin 898c425bb61bb936be3117e39564691ac56b901f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk-portable
 * [new ref]         898c425bb61bb936be3117e39564691ac56b901f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 898c425 Returned misteriously disapeared line