$ git clone -n https://src.fedoraproject.org/rpms/decibels.git /var/lib/mock/f42-build-3426908-45199/root/chroot_tmpdir/scmroot/decibels
Cloning into '/var/lib/mock/f42-build-3426908-45199/root/chroot_tmpdir/scmroot/decibels'...
$ git fetch origin 05000c66fbfa7e9fe2479596cbabb6609b1cf37d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/decibels
 * [new ref]         05000c66fbfa7e9fe2479596cbabb6609b1cf37d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05000c6 Update to 48.0