Opam: use opam2, a local switch, and a fixed remote.

Makefile

@@ -1,13 +1,17 @@
 
 DEV ?= --dev
-PACKAGES:=$(patsubst %.opam,%,$(notdir $(shell find . -name *.opam -print)))
+PACKAGES:=$(patsubst %.opam,%,$(notdir $(shell find src vendors -name \*.opam -print)))
 
 current_ocaml_version := $(shell ocamlc -version)
+current_opam_version := $(shell opam --version)
 include scripts/version.sh
 
 ifneq (${current_ocaml_version},${ocaml_version})
 $(error Unexpected ocaml version (found: ${current_ocaml_version}, expected: ${ocaml_version}))
 endif
+ifneq (${current_opam_version},${opam_version})
+$(error Unexpected opam version (found: ${current_opam_version}, expected: ${opam_version}))
+endif
 
 all:
 	@jbuilder build ${DEV} \
@@ -30,15 +34,15 @@ all:
 
 all.pkg:
 	@jbuilder build ${DEV} \
-	    $(patsubst %.opam,%.install, $(shell find . -name \*.opam -print))
+	    $(patsubst %.opam,%.install, $(shell find src vendors -name \*.opam -print))
 
 $(addsuffix .pkg,${PACKAGES}): %.pkg:
 	@jbuilder build ${DEV} \
-	    $(patsubst %.opam,%.install, $(shell find . -name $*.opam -print))
+	    $(patsubst %.opam,%.install, $(shell find src vendors -name $*.opam -print))
 
 $(addsuffix .test,${PACKAGES}): %.test:
 	@jbuilder build ${DEV} \
-	    @$(patsubst %/$*.opam,%,$(shell find -name $*.opam))/runtest
+	    @$(patsubst %/$*.opam,%,$(shell find src vendors -name $*.opam))/runtest
 
 doc-html: all
 	@jbuilder build @doc ${DEV}

docs/introduction/howto.rst

@@ -37,42 +37,16 @@ The simplest way to install all dependencies is by using `OPAM
 
 
 **IMPORTANT**: Please use `version 2
-<https://opam.ocaml.org/blog/opam-2-0-0-rc2/>`_ of OPAM. That
+<https://opam.ocaml.org/blog/opam-2-0-0-rc3/>`_ of OPAM. That
 is what the Tezos Core team uses. Most distribution probably ship
 **version 1** of OPAM out of the box, but installing version 2 is
 preferable for many reasons.
 
-Then, you need to create a new switch alias for Tezos. A switch is your
-own version of the OPAM configuration, including the OCaml compiler, all
-packages, and package manager configuration related to your project.
-This is necessary so that the project doesn’t conflict with other OCaml
-projects or other versions of Tezos.
-
-::
-
-    opam update
-    opam switch create tezos 4.06.1
-    eval $(opam env)
-
-If you are stuck with OPAM1:
-
-::
-
-    opam update
-    opam switch tezos --alias-of 4.06.1
-    eval $(opam config env)
-
-The last command-line activates the switch.
-
-Note that if you previously created a switch named ``tezos`` but with
-an older OCaml version you need to remove the switch with ``opam
-switch remove tezos``.
-
 
 Install Tezos dependencies with OPAM
 ------------------------------------
 
-Install the libraries which Tezos depends on:
+Install the OCaml compiler and the libraries which Tezos depends on:
 
 ::
 
@@ -107,17 +81,6 @@ Note that, when executing ``make build-deps``, OPAM will detect if
 required system dependencies are installed. However, it is not able to
 detect which versions you actually have.
 
-If after a ``git pull``, the build fails (either at ``make
-build-deps`` or ``make``), you might try to clean up a little bit the
-opam internal state with the following commands:
-
-::
-
-    opam update
-    opam pin list -s | xargs opam pin remove
-    make build-deps
-    make
-
 
 Join the Alphanet!
 ------------------

scripts/check_opam_test.sh

@@ -5,7 +5,7 @@ set -e
 script_dir="$(cd "$(dirname "$0")" && echo "$(pwd -P)/")"
 src_dir="$(dirname "$script_dir")"
 
-opams=$(find "$src_dir" -name \*.opam -print)
+opams=$(find "$src_dir/vendors" "$src_dir/src" -name \*.opam -print)
 
 yml="${1:-$src_dir/.gitlab-ci.yml}"
 
@@ -21,7 +21,7 @@ done
 
 tested=$(grep -e '^opam:..:tezos-.*:$' "$yml" | cut -d: -f3)
 for package in $tested; do
-    found=$(find "$src_dir" -name $package.opam | wc -l 2>&1)
+    found=$(find "$src_dir/src" "$src_dir/vendors" -name $package.opam | wc -l 2>&1)
     if [ $found != 1 ] ; then
         missing=yes
         echo "Test for unknown package '$package'."

scripts/install_build_deps.sh

@@ -5,12 +5,27 @@ src_dir="$(dirname "$script_dir")"
 
 . "$script_dir"/version.sh
 
+if [ "$(opam --version)" != "$opam_version" ] ; then
+    echo "Unexpected opam version (found: $(opam -version), expected: $opam_version)"
+    exit 1
+fi
+
+opam repository set-url tezos --dont-select $opam_repository || \
+    opam repository add tezos --dont-select $opam_repository
+
+if [ ! -d "$src_dir/_opam" ] ; then
+    opam switch create "$src_dir" --repositories=tezos ocaml-base-compiler.$ocaml_version
+fi
+
+if [ ! -d "$src_dir/_opam" ] ; then
+    echo "Failed to create the opam switch"
+    exit 1
+fi
+
+eval $(opam env)
+
 if [ "$(ocaml -vnum)" != "$ocaml_version" ]; then
-  echo ;
+    opam install --unlock-base ocaml-base-compiler.$ocaml_version
-  echo "   Unexpected compiler version ($(ocaml -vnum))";
-  echo "   You should use ocaml-$ocaml_version.";
-  echo ;
-  exit 1;
 fi
 
 "$script_dir"/opam-unpin.sh
@@ -19,4 +34,4 @@ fi
 opam list --installed depext || opam install depext
 opam depext $packages
 
-opam install $packages --deps-only
+opam install $packages --deps-only --with-test

scripts/opam-pin.sh

@@ -7,7 +7,7 @@ src_dir="$(dirname "$script_dir")"
 
 export OPAMYES=yes
 
-opams=$(find "$src_dir" -name \*.opam -print)
+opams=$(find "$src_dir/vendors" "$src_dir/src" -name \*.opam -print)
 
 packages=
 for opam in $opams; do
@@ -18,7 +18,7 @@ for opam in $opams; do
     opam pin add --no-action $package $dir
 done
 
-packages=$(opam list --short --all --sort $packages)
+packages=$(opam list --short --sort --pinned $packages)
 
 echo
 echo "Pinned packages:"

scripts/opam-remove.sh

@@ -15,6 +15,6 @@ for opam in $opams; do
     packages="$packages $package"
 done
 
-installed=$(opam list --short --installed $packages)
+installed=$(opam list --short --installed --pinned $packages)
 
 opam remove $installed

scripts/opam-upgrade.sh

@@ -26,7 +26,7 @@ silent () {
 echo "Updating package description..."
 silent . ./scripts/opam-pin.sh
 
-upgradables=$(opam list --short --installed $packages)
+upgradables=$(opam list --short --installed --pinned $packages)
 
 if [ -z "$upgradables" ]; then
     echo "No previously installed package. Nothing to do."

scripts/version.sh

@@ -7,4 +7,7 @@ alpine_version=3.6
 ocaml_version=4.06.1
 hidapi_version=0.8.0_rc1
 opam_version=2.0.0~rc
-opam_tag=2.0.0-rc
+opam_tag=2.0.0-rc3
+opam_repository_tag=7db0db5dc53de44d1a0190b1310aa225e04df9ef
+opam_repository_url=git+https://gitlab.com/tezos/opam-repository
+opam_repository=$opam_repository_url\#$opam_repository_tag

src/lib_stdlib/tezos-stdlib.opam

@@ -16,6 +16,7 @@ depends: [
   "lwt"
   "zarith"
   "alcotest" { test }
+  "ocp-indent" { test }
 ]
 build: [
   [ "jbuilder" "build" "-p" name "-j" jobs ]