$ git clone -n https://src.fedoraproject.org/rpms/avr-gcc.git /var/lib/mock/f41-build-3150587-40566/root/chroot_tmpdir/scmroot/avr-gcc
Cloning into '/var/lib/mock/f41-build-3150587-40566/root/chroot_tmpdir/scmroot/avr-gcc'...
$ git fetch origin 7fdda8f4ae5f9ee8b8510a17c3655acf4c44608d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/avr-gcc
 * [new ref]         7fdda8f4ae5f9ee8b8510a17c3655acf4c44608d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fdda8f updated to 14.2.0