$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Data-Accessor.git /var/lib/mock/f45-build-22376-591/root/chroot_tmpdir/scmroot/perl-Class-Data-Accessor
Cloning into '/var/lib/mock/f45-build-22376-591/root/chroot_tmpdir/scmroot/perl-Class-Data-Accessor'...
$ git fetch origin b1e4ec5a8eaeac9f5410f944cb0f88bdea421e07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Data-Accessor
 * [new ref]         b1e4ec5a8eaeac9f5410f944cb0f88bdea421e07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1e4ec5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild