$ git clone -n https://src.fedoraproject.org/rpms/rust-value-bag-serde1.git /var/lib/mock/f40-build-2656510-66915/root/chroot_tmpdir/scmroot/rust-value-bag-serde1
Cloning into '/var/lib/mock/f40-build-2656510-66915/root/chroot_tmpdir/scmroot/rust-value-bag-serde1'...
$ git fetch origin bf383e1a73ff0aabaca4dba435397a86e1569d23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-value-bag-serde1
 * [new ref]         bf383e1a73ff0aabaca4dba435397a86e1569d23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf383e1 Update to version 1.7.0; Fixes RHBZ#2256700