$ git clone -n https://src.fedoraproject.org/rpms/rust-async-signal.git /var/lib/mock/f39-test-2568369-62218/root/chroot_tmpdir/scmroot/rust-async-signal
Cloning into '/var/lib/mock/f39-test-2568369-62218/root/chroot_tmpdir/scmroot/rust-async-signal'...
$ git fetch origin b08cb48fdde640a97c77c7f82ff5c1ee6d1aceee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-signal
 * [new ref]         b08cb48fdde640a97c77c7f82ff5c1ee6d1aceee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b08cb48 Update to version 0.2.5; Fixes RHBZ#2246798