$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Compress-Brotli.git /var/lib/mock/f41-build-815966-149914/root/chroot_tmpdir/scmroot/perl-IO-Compress-Brotli
Cloning into '/var/lib/mock/f41-build-815966-149914/root/chroot_tmpdir/scmroot/perl-IO-Compress-Brotli'...
$ git fetch origin 7ead60a580b828f02155e9d7560563d21da6e0f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Compress-Brotli
 * [new ref]         7ead60a580b828f02155e9d7560563d21da6e0f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ead60a Perl 5.40 rebuild