$ git clone -n https://src.fedoraproject.org/rpms/rust-vec1.git /var/lib/mock/f42-build-3251839-41222/root/chroot_tmpdir/scmroot/rust-vec1
Cloning into '/var/lib/mock/f42-build-3251839-41222/root/chroot_tmpdir/scmroot/rust-vec1'...
$ git fetch origin 20206dd490c948fa561d63eb86aca7bb638e5b3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-vec1
 * [new ref]         20206dd490c948fa561d63eb86aca7bb638e5b3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20206dd Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild