$ git clone -n https://src.fedoraproject.org/rpms/claws-mail.git /var/lib/mock/f42-build-3354892-45022/root/chroot_tmpdir/scmroot/claws-mail
Cloning into '/var/lib/mock/f42-build-3354892-45022/root/chroot_tmpdir/scmroot/claws-mail'...
$ git fetch origin b009eafea8ff1cdd063549ce1b5dddb8b0a7639e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/claws-mail
 * [new ref]         b009eafea8ff1cdd063549ce1b5dddb8b0a7639e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b009eaf Update to 4.3.1. Add BR pkgconfig(ayatana-appindicator3-0.1)