$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-PkgConfig.git /var/lib/mock/f45-build-23425-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-PkgConfig
Cloning into '/var/lib/mock/f45-build-23425-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-PkgConfig'...
$ git fetch origin 5e42ed5da6aeb0691eb947a4c69703229dda6fa0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-PkgConfig
 * [new ref]         5e42ed5da6aeb0691eb947a4c69703229dda6fa0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e42ed5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild