$ git clone -n https://src.fedoraproject.org/rpms/ghc-blaze-textual.git /var/lib/mock/f39-build-1507453-35261/root/chroot_tmpdir/scmroot/ghc-blaze-textual
Cloning into '/var/lib/mock/f39-build-1507453-35261/root/chroot_tmpdir/scmroot/ghc-blaze-textual'...
$ git fetch origin 61ff54d482affa42d3010021290c4ca48a876b52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-blaze-textual
 * [new ref]         61ff54d482affa42d3010021290c4ca48a876b52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61ff54d https://hackage.haskell.org/package/blaze-textual-0.2.3.1/changelog