$ git clone -n https://src.fedoraproject.org/rpms/rust-dirs.git /var/lib/mock/f38-build-side-42-init-devel-1130564-30311/root/chroot_tmpdir/scmroot/rust-dirs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1130564-30311/root/chroot_tmpdir/scmroot/rust-dirs'...
$ git fetch origin 2591b8fd741a607246dbcba2229e12d42678b15f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dirs
 * [new ref]         2591b8fd741a607246dbcba2229e12d42678b15f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2591b8f Update to version 5.0.1; Fixes RHBZ#2179647