$ git clone -n https://src.fedoraproject.org/rpms/perl-String-RewritePrefix.git /var/lib/mock/f45-build-26389-617/root/chroot_tmpdir/scmroot/perl-String-RewritePrefix
Cloning into '/var/lib/mock/f45-build-26389-617/root/chroot_tmpdir/scmroot/perl-String-RewritePrefix'...
$ git fetch origin a92e446e8ffb22ebcd0f39dadbd38dbd53aa4c65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-RewritePrefix
 * [new ref]         a92e446e8ffb22ebcd0f39dadbd38dbd53aa4c65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a92e446 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild