$ git clone -n https://src.fedoraproject.org/rpms/rust-yansi.git /var/lib/mock/f40-build-1972001-25224/root/chroot_tmpdir/scmroot/rust-yansi
Cloning into '/var/lib/mock/f40-build-1972001-25224/root/chroot_tmpdir/scmroot/rust-yansi'...
$ git fetch origin f5c77ce68382b0d5435b8026f8483fa9094a179e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-yansi
 * [new ref]         f5c77ce68382b0d5435b8026f8483fa9094a179e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5c77ce Regenerate with rust2rpm v26