$ git clone -n https://src.fedoraproject.org/rpms/perl-File-BOM.git /var/lib/mock/f45-build-23457-597/root/chroot_tmpdir/scmroot/perl-File-BOM
Cloning into '/var/lib/mock/f45-build-23457-597/root/chroot_tmpdir/scmroot/perl-File-BOM'...
$ git fetch origin 7fdcfc22859cc998801ee0b3d19c6534f458000b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-BOM
 * [new ref]         7fdcfc22859cc998801ee0b3d19c6534f458000b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fdcfc2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild