$ git clone -n https://src.fedoraproject.org/rpms/rust-blake2.git /var/lib/mock/f39-build-1501205-34826/root/chroot_tmpdir/scmroot/rust-blake2
Cloning into '/var/lib/mock/f39-build-1501205-34826/root/chroot_tmpdir/scmroot/rust-blake2'...
$ git fetch origin 39bcbe0b5cd882674fd46c2a33ea195946c2db41:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-blake2
 * [new ref]         39bcbe0b5cd882674fd46c2a33ea195946c2db41 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39bcbe0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild