$ git clone -n https://src.fedoraproject.org/rpms/rust-asyncgit.git /var/lib/mock/f40-build-1538244-23931/root/chroot_tmpdir/scmroot/rust-asyncgit
Cloning into '/var/lib/mock/f40-build-1538244-23931/root/chroot_tmpdir/scmroot/rust-asyncgit'...
$ git fetch origin dffb7d94d7919d9412066e6dbe860077ec2d07a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-asyncgit
 * [new ref]         dffb7d94d7919d9412066e6dbe860077ec2d07a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dffb7d9 Update to version 0.26.3; Fixes RHBZ#2265321