$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-LibBuilder.git /var/lib/mock/f45-build-23421-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-LibBuilder
Cloning into '/var/lib/mock/f45-build-23421-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-LibBuilder'...
$ git fetch origin 08ebc34f65106671c916a5b3fe9a23d571d1189e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-LibBuilder
 * [new ref]         08ebc34f65106671c916a5b3fe9a23d571d1189e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08ebc34 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild