$ git clone -n https://src.fedoraproject.org/rpms/perl-Boulder.git /var/lib/mock/f39-build-1433766-31887/root/chroot_tmpdir/scmroot/perl-Boulder
Cloning into '/var/lib/mock/f39-build-1433766-31887/root/chroot_tmpdir/scmroot/perl-Boulder'...
$ git fetch origin e56b2bdb1bae916309c08937213e6dd3437b39f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Boulder
 * [new ref]         e56b2bdb1bae916309c08937213e6dd3437b39f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e56b2bd Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild