$ git clone -n https://src.fedoraproject.org/rpms/rust-procs.git /var/lib/mock/f39-build-1934555-43117/root/chroot_tmpdir/scmroot/rust-procs
Cloning into '/var/lib/mock/f39-build-1934555-43117/root/chroot_tmpdir/scmroot/rust-procs'...
$ git fetch origin fbaae6aaa39060d09a15bf16d0a549ceb8063d53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-procs
 * [new ref]         fbaae6aaa39060d09a15bf16d0a549ceb8063d53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbaae6a Update to version 0.14.1; Fixes RHBZ#2242470