$ git clone -n https://src.fedoraproject.org/rpms/rust-git-version-macro.git /var/lib/mock/f39-build-1521691-35855/root/chroot_tmpdir/scmroot/rust-git-version-macro
Cloning into '/var/lib/mock/f39-build-1521691-35855/root/chroot_tmpdir/scmroot/rust-git-version-macro'...
$ git fetch origin bd7a6bf7c7c0cc4ed8cff95c3499bc8851cdb4f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git-version-macro
 * [new ref]         bd7a6bf7c7c0cc4ed8cff95c3499bc8851cdb4f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd7a6bf Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild