$ git clone -n https://src.fedoraproject.org/rpms/ghc-djinn-lib.git /var/lib/mock/f38-build-side-42-init-devel-895308-28550/root/chroot_tmpdir/scmroot/ghc-djinn-lib
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-895308-28550/root/chroot_tmpdir/scmroot/ghc-djinn-lib'...
$ git fetch origin f786b522c2c7b5a3cc2770e38bca063ca670c429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-djinn-lib
 * [new ref]         f786b522c2c7b5a3cc2770e38bca063ca670c429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f786b52 Convert to %autorelease and %autochangelog