$ git clone -n https://src.fedoraproject.org/rpms/perl-WebService-MusicBrainz.git /var/lib/mock/f45-build-27436-624/root/chroot_tmpdir/scmroot/perl-WebService-MusicBrainz
Cloning into '/var/lib/mock/f45-build-27436-624/root/chroot_tmpdir/scmroot/perl-WebService-MusicBrainz'...
$ git fetch origin 260488ebf8aafd6175473d42b9af694d29d64851:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WebService-MusicBrainz
 * [new ref]         260488ebf8aafd6175473d42b9af694d29d64851 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 260488e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild