$ git clone -n https://src.fedoraproject.org/rpms/rust-salsa20.git /var/lib/mock/f45-build-44679-816/root/chroot_tmpdir/scmroot/rust-salsa20
Cloning into '/var/lib/mock/f45-build-44679-816/root/chroot_tmpdir/scmroot/rust-salsa20'...
$ git fetch origin a9843a0164e2a89da10635433a44936aa7527950:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-salsa20
 * [new ref]         a9843a0164e2a89da10635433a44936aa7527950 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9843a0 Update to version 0.11.0; Fixes RHBZ#2453233