Adapt the depext docker CI tests for the nix backend

Author: RyanGibb

.github/scripts/depexts/generate-actions.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-#for target in alpine archlinux centos debian fedora gentoo opensuse oraclelinux ubuntu; do
+#for target in alpine archlinux centos debian fedora gentoo opensuse oraclelinux ubuntu nix; do
 target=$1
 dir=.github/actions/$target
 
@@ -102,6 +102,12 @@ RUN apt install -y $mainlibs $ocaml
 RUN apt install -y g++
 EOF
     ;;
+  nix)
+    cat >$dir/Dockerfile << EOF
+FROM nixos/nix
+RUN nix-channel --update
+RUN nix-env -i gnum4 git rsync patch bzip2 gnumake wget ocaml ocaml5.1.1-ocaml-compiler-libs unzip gcc diffutils patch getconf-glibc gnused
+EOF
 esac
 
 OCAML_INVARIANT="\"ocaml\" {>= \"4.09.0\"$OCAML_CONSTRAINT}"
@@ -121,12 +127,34 @@ RUN echo 'default-invariant: [ $OCAML_INVARIANT ]' > /opam/opamrc
 RUN /usr/bin/opam init --no-setup --disable-sandboxing --bare --config /opam/opamrc git+$OPAM_REPO#$OPAM_REPO_SHA
 RUN echo 'archive-mirrors: "https://opam.ocaml.org/cache"' >> \$OPAMROOT/config
 RUN /usr/bin/opam switch create this-opam --formula='$OCAML_INVARIANT'
+EOF
+
+# we can't `nix-env -i binutils`
+# https://github.com/NixOS/nix/issues/10587
+if [ $target == "nix" ]; then
+	cat >>$dir/Dockerfile << EOF
+RUN nix-shell -p binutils --run "/usr/bin/opam install opam-core opam-state opam-solver opam-repository opam-format opam-client --deps"
+EOF
+else
+	cat >>$dir/Dockerfile << EOF
 RUN /usr/bin/opam install opam-core opam-state opam-solver opam-repository opam-format opam-client --deps
+EOF
+fi
+
+cat >>$dir/Dockerfile << EOF
 RUN /usr/bin/opam clean -as --logs
 COPY entrypoint.sh /opam/entrypoint.sh
-ENTRYPOINT ["/opam/entrypoint.sh"]
 EOF
 
+if [ $target == "nix" ]; then
+	cat >>$dir/Dockerfile << EOF
+ENTRYPOINT ["nix-shell", "-p", "binutils", "--run", "/opam/entrypoint.sh"]
+EOF
+else
+	cat >>$dir/Dockerfile << EOF
+ENTRYPOINT ["/opam/entrypoint.sh"]
+EOF
+fi
 
 ### Generate the entrypoint
 cat >$dir/entrypoint.sh << EOF
@@ -142,10 +170,23 @@ cd /github/workspace
 #git clone https://github.com/ocaml/opam --single-branch --branch 2.2 --depth 1 local-opam
 #cd local-opam
 
-opam install . --deps
-eval \$(opam env)
+/usr/bin/opam install . --deps
+eval \$(/usr/bin/opam env)
 ./configure
 make
+
+EOF
+
+if [ $target == "nix" ]; then
+	cat >>$dir/entrypoint.sh << EOF
+./opam var --global os-family=nixos
+./opam var --global os-distribution=nixos
+
+EOF
+fi
+
+
+cat >>$dir/entrypoint.sh << EOF
 ./opam config report
 ./opam switch create confs --empty
 EOF

.github/workflows/depexts.yml

@@ -199,3 +199,21 @@ jobs:
     - name: depexts actions ubuntu
       uses: ./.github/actions/ubuntu
       id: depexts-ubuntu
+
+  depexts-nix:
+    needs: opam-cache
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: opam binary cache
+      uses: actions/cache@v3
+      with:
+        path: binary/opam
+        key: binary-${{ env.OPAMVERSION }}
+    - name: generate action
+      run: |
+        bash .github/scripts/depexts/generate-actions.sh nix
+    - name: depexts actions nix
+      uses: ./.github/actions/nix
+      id: depexts-nix

src/state/opamSwitchState.ml

@@ -201,7 +201,6 @@ let depexts_status_of_packages_raw
   in
   let syspkg_set = syspkg_set -- bypass in
   let ret =
-    Printf.printf "here\n\r";
     match OpamSysInteract.packages_status ?env global_config syspkg_set ~old_packages:old_syspkg_set with
     | avail, required, not_found ->
       let avail, not_found =