$ git clone -n https://src.fedoraproject.org/rpms/ghc-HTTP.git /var/lib/mock/f38-build-side-42-init-devel-586246-26119/root/chroot_tmpdir/scmroot/ghc-HTTP
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-586246-26119/root/chroot_tmpdir/scmroot/ghc-HTTP'...
$ git fetch origin cf6ed1061891348f5e33fb2dc308ca122554f3ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-HTTP
 * [new ref]         cf6ed1061891348f5e33fb2dc308ca122554f3ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf6ed10 Convert to %autorelease and %autochangelog