run-ci: Fix cabal workflow

This should fix #11.

ci/cabal.project

 packages: .
+
+source-repository-package
+  type: git
+  location: https://github.com/bgamari/hackage-overlay-repo-tool
+  tag: 18eb61c830ad908d36d343f400a1588af6b9a03a

ci/default.nix

@@ -35,6 +35,7 @@ let
         bash curl gnutar findutils patch rsync openssl
         cabal-install ghc gcc binutils-unwrapped pwgen gnused
         hackage-repo-tool overlay-tool python3
+        git # cabal-install wants this to fetch source-repository-packages
       ];
     in
       runCommand "repo" {

run-ci

@@ -26,17 +26,33 @@ if [ -n "$EXTRA_HC_OPTS" ]; then
 fi
 
 mkdir -p run
-cd run
 
-echo "" > deps.cabal.project
+echo "" > run/deps.cabal.project
 if [ -n "$USE_NIX" ]; then
   # Generate native library dependency mapping
-  nix eval --raw -f ../. cabalDepsSrc >> deps.cabal.project
+  nix eval --raw -f ./. cabalDepsSrc >> run/deps.cabal.project
   run="nix run -f ../. -c head-hackage-ci"
 else
-  run="cabal new-run head-hackage-ci --"
+  run="head-hackage-ci"
+
+  # Sigh, this is an abysmal hack
+  bindir=$(realpath .)/run/bin
+  mkdir -p $bindir
+  PATH=$bindir:$PATH
+  cp build-repo.sh $bindir/build-repo.sh
+  if ! which tool; then
+    echo "Installing hackage-overlay-repo-tool..."
+    cabal new-install tool --installdir=$bindir
+  fi
+  if ! which hackage-repo-tool; then
+    echo "Installing hackage-repo-tool..."
+    cabal new-install hackage-repo-tool --installdir=$bindir
+  fi
+  cabal new-install head-hackage-ci --installdir=$bindir
 fi
 
+cd run
+rm -f cabal.project
 set -x
 $run \
   test-patches \