$ git clone -n https://src.fedoraproject.org/rpms/rust-actix-rt.git /var/lib/mock/f45-build-39810-759/root/chroot_tmpdir/scmroot/rust-actix-rt
Cloning into '/var/lib/mock/f45-build-39810-759/root/chroot_tmpdir/scmroot/rust-actix-rt'...
$ git fetch origin d1619bc333d30287872d4d143a9ed7979f1bd1a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-actix-rt
 * [new ref]         d1619bc333d30287872d4d143a9ed7979f1bd1a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1619bc Update to version 2.12.0; Fixes RHBZ#2521159