$ git clone -n https://src.fedoraproject.org/rpms/ghc-pattern-arrows.git /var/lib/mock/f38-build-side-42-init-devel-913081-28703/root/chroot_tmpdir/scmroot/ghc-pattern-arrows
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-913081-28703/root/chroot_tmpdir/scmroot/ghc-pattern-arrows'...
$ git fetch origin 0a1998e48903870883531f0d8496a57d7b38fa1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pattern-arrows
 * [new ref]         0a1998e48903870883531f0d8496a57d7b38fa1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a1998e Convert to %autorelease and %autochangelog