$ git clone -n https://src.fedoraproject.org/rpms/perl-Module-Build-XSUtil.git /var/lib/mock/f45-build-24765-606/root/chroot_tmpdir/scmroot/perl-Module-Build-XSUtil
Cloning into '/var/lib/mock/f45-build-24765-606/root/chroot_tmpdir/scmroot/perl-Module-Build-XSUtil'...
$ git fetch origin 6e31c9de38d5db189f68a16e9f29d71f88f4d3c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Module-Build-XSUtil
 * [new ref]         6e31c9de38d5db189f68a16e9f29d71f88f4d3c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e31c9d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild