$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Procmail.git /var/lib/mock/f41-build-780120-13558/root/chroot_tmpdir/scmroot/perl-Mail-Procmail
Cloning into '/var/lib/mock/f41-build-780120-13558/root/chroot_tmpdir/scmroot/perl-Mail-Procmail'...
$ git fetch origin 590a3133de465d64afce05dbce4b22371cb2c4bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Procmail
 * [new ref]         590a3133de465d64afce05dbce4b22371cb2c4bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 590a313 Eliminate use of obsolete %patchN syntax (#2283636)