$ git clone -n https://src.fedoraproject.org/rpms/rust-arc-swap.git /var/lib/mock/f38-build-side-43-rust-devel-1415020-31454/root/chroot_tmpdir/scmroot/rust-arc-swap
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415020-31454/root/chroot_tmpdir/scmroot/rust-arc-swap'...
$ git fetch origin 0d52e3544ac0721ea3ced5c188cb988265b12223:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arc-swap
 * [new ref]         0d52e3544ac0721ea3ced5c188cb988265b12223 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d52e35 Update to version 1.6.0; Fixes RHBZ#2157190