$ git clone -n https://src.fedoraproject.org/rpms/rust-compact_str.git /var/lib/mock/f38-build-side-42-init-devel-811817-28302/root/chroot_tmpdir/scmroot/rust-compact_str
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-811817-28302/root/chroot_tmpdir/scmroot/rust-compact_str'...
$ git fetch origin 25b4b8c9612a683405169b9fb1bbf714c9d82ff6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-compact_str
 * [new ref]         25b4b8c9612a683405169b9fb1bbf714c9d82ff6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25b4b8c Initial import (rhbz#2182542)