$ git clone -n https://src.fedoraproject.org/rpms/rust-build-fs-tree.git /var/lib/mock/f40-build-2061290-49167/root/chroot_tmpdir/scmroot/rust-build-fs-tree
Cloning into '/var/lib/mock/f40-build-2061290-49167/root/chroot_tmpdir/scmroot/rust-build-fs-tree'...
$ git fetch origin e9da238e67b0c7fc9b3166566dcf221d0318bf19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-build-fs-tree
 * [new ref]         e9da238e67b0c7fc9b3166566dcf221d0318bf19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e9da238 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild