$ git clone -n https://src.fedoraproject.org/rpms/perl-Authen-PAM.git /var/lib/mock/f45-build-21826-588/root/chroot_tmpdir/scmroot/perl-Authen-PAM
Cloning into '/var/lib/mock/f45-build-21826-588/root/chroot_tmpdir/scmroot/perl-Authen-PAM'...
$ git fetch origin 1b8f40a6fb8d3c638f59ab9d255efa9725691161:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Authen-PAM
 * [new ref]         1b8f40a6fb8d3c638f59ab9d255efa9725691161 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b8f40a Perl 5.44 rebuild