$ git clone -n https://src.fedoraproject.org/rpms/perl-Authen-PAM.git /var/lib/mock/f41-build-787163-13594/root/chroot_tmpdir/scmroot/perl-Authen-PAM
Cloning into '/var/lib/mock/f41-build-787163-13594/root/chroot_tmpdir/scmroot/perl-Authen-PAM'...
$ git fetch origin c36b4cc1f1a39623f293acd0b6bd3674f9644538:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Authen-PAM
 * [new ref]         c36b4cc1f1a39623f293acd0b6bd3674f9644538 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c36b4cc Eliminate use of obsolete %patchN syntax (#2283636)