$ git clone -n https://src.fedoraproject.org/rpms/botan2.git /var/lib/mock/f42-build-side-1-3511990-46060/root/chroot_tmpdir/scmroot/botan2
Cloning into '/var/lib/mock/f42-build-side-1-3511990-46060/root/chroot_tmpdir/scmroot/botan2'...
$ git fetch origin 62a97cb6e56a7a87e60a0927c5442159460e65ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/botan2
 * [new ref]         62a97cb6e56a7a87e60a0927c5442159460e65ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62a97cb Fix FTBFS with gcc-15 (rhbz#2339942)