$ git clone -n https://src.fedoraproject.org/rpms/electrum.git /var/lib/mock/f42-build-3408494-45145/root/chroot_tmpdir/scmroot/electrum
Cloning into '/var/lib/mock/f42-build-3408494-45145/root/chroot_tmpdir/scmroot/electrum'...
$ git fetch origin 5fa5617ef541ddcee54565c3b4105a711d0b2e4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/electrum
 * [new ref]         5fa5617ef541ddcee54565c3b4105a711d0b2e4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fa5617 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild