$ git clone -n https://src.fedoraproject.org/rpms/perl-Plack-Test-ExternalServer.git /var/lib/mock/f40-build-2307627-57240/root/chroot_tmpdir/scmroot/perl-Plack-Test-ExternalServer
Cloning into '/var/lib/mock/f40-build-2307627-57240/root/chroot_tmpdir/scmroot/perl-Plack-Test-ExternalServer'...
$ git fetch origin 5d8bc64effa70e995b7546818e2b6505e2c4a8ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Plack-Test-ExternalServer
 * [new ref]         5d8bc64effa70e995b7546818e2b6505e2c4a8ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d8bc64 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild