$ git clone -n https://src.fedoraproject.org/rpms/claws-mail.git /var/lib/mock/f41-build-813492-148684/root/chroot_tmpdir/scmroot/claws-mail
Cloning into '/var/lib/mock/f41-build-813492-148684/root/chroot_tmpdir/scmroot/claws-mail'...
$ git fetch origin 2797bc8be33e4f221716c7072ee150fd1e0ed963:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/claws-mail
 * [new ref]         2797bc8be33e4f221716c7072ee150fd1e0ed963 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2797bc8 Perl 5.40 rebuild