$ git clone -n https://src.fedoraproject.org/forks/imbearchild/rpms/avr-gcc.git /var/lib/mock/f39-build-2262234-54487/root/chroot_tmpdir/scmroot/avr-gcc
Cloning into '/var/lib/mock/f39-build-2262234-54487/root/chroot_tmpdir/scmroot/avr-gcc'...
$ git fetch origin 3a364b425f99feb5b71e92b0a017440407fe43da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/imbearchild/rpms/avr-gcc
 * [new ref]         3a364b425f99feb5b71e92b0a017440407fe43da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a364b4 Fix build on rv64