[setup] add automatic setup for the developer environment

Summary:
Useful for hacking on infer, and when eg the default opam switch changes and
one has to remember which development packages to install all over again
(merlin, etc.).

Reviewed By: mbouaziz

Differential Revision: D5328701

fbshipit-source-id: 7b7694e

CONTRIBUTING.md

@@ -21,18 +21,12 @@ We welcome contributions via [pull requests on GitHub](https://github.com/facebo
 
 ### Development Dependencies
 
-You'll want to install a few more dependencies to comfortably hack on the infer codebase. Using
-opam:
+You'll want to install a few more dependencies to comfortably hack on the infer codebase. Simply
+run:
 ```sh
-opam install ocp-indent merlin tuareg
+make devsetup
 ```
 
-[Merlin](https://github.com/ocaml/merlin) provides OCaml and Reason support for several editors,
-including [Atom](https://atom.io/), [Emacs](https://www.gnu.org/software/emacs/), and
-[Vim](http://www.vim.org/).
-
-Run `opam user-setup install` to set up your terminal and editors to use this tooling.
-
 ### Tips and Tricks
 
 - Build the code: `make -j`.

Makefile

@@ -540,6 +540,58 @@ opam.lock: opam
 	$(QUIET)$(call silent_on_success,generating opam.lock,\
 	  $(OPAM) lock --pkg  $(INFER_PKG_OPAMLOCK) > opam.lock)
 
+OPAM_DEV_DEPS = ocp-indent merlin tuareg
+
+.PHONY: devsetup
+devsetup: Makefile.autoconf
+	$(QUIET)[ $(OPAM) != "no" ] || (echo 'No `opam` found, aborting setup.' >&2; exit 1)
+	$(QUIET)$(call silent_on_success,installing $(OPAM_DEV_DEPS),\
+	  OPAMSWITCH=$(OPAMSWITCH); $(OPAM) install --yes --no-checksum user-setup $(OPAM_DEV_DEPS))
+	$(QUIET)echo '$(TERM_INFO)*** Running `opam config setup -a`$(TERM_RESET)' >&2
+	$(QUIET)OPAMSWITCH=$(OPAMSWITCH); $(OPAM) config --yes setup -a
+	$(QUIET)echo '$(TERM_INFO)*** Running `opam user-setup`$(TERM_RESET)' >&2
+	$(QUIET)OPAMSWITCH=$(OPAMSWITCH); OPAMYES=1; $(OPAM) user-setup install
+# 	expand all occurrences of "~" in PATH and MANPATH
+	$(QUIET)infer_repo_is_in_path=$$(echo $${PATH//\~/$$HOME} | grep -q "$(ABSOLUTE_ROOT_DIR)"/infer/bin; echo $$?); \
+	infer_repo_is_in_manpath=$$(echo $${MANPATH//\~/$$HOME} | grep -q "$(ABSOLUTE_ROOT_DIR)"/infer/man; echo $$?); \
+	if [ "$$infer_repo_is_in_path" != "0" ] || [ "$$infer_repo_is_in_manpath" != "0" ]; then \
+	  shell_config_file="<could not auto-detect, please fill in yourself>"; \
+	  if [ $$(basename "$(ORIG_SHELL)") = "bash" ]; then \
+	    if [ "$(PLATFORM)" = "Linux" ]; then \
+	      shell_config_file="$$HOME"/.bashrc; \
+	    else \
+	      shell_config_file="$$HOME"/.bash_profile; \
+	    fi; \
+	  elif [ $$(basename "$(ORIG_SHELL)") = "zsh" ]; then \
+	    shell_config_file="$$HOME"/.zshrc; \
+	  fi; \
+	  echo >&2; \
+	  echo '$(TERM_INFO)*** NOTE: `infer` is not in your PATH or MANPATH. If you are hacking on infer, you may$(TERM_RESET)' >&2; \
+	  echo '$(TERM_INFO)*** NOTE: want to make infer executables and manuals available in your terminal. Type$(TERM_RESET)' >&2; \
+	  echo '$(TERM_INFO)*** NOTE: the following commands to configure the current terminal and record the$(TERM_RESET)' >&2; \
+	  printf '$(TERM_INFO)*** NOTE: changes in your shell configuration file (%s):$(TERM_RESET)\n' "$$shell_config_file">&2; \
+	  echo >&2; \
+	  if [ "$$infer_repo_is_in_path" != "0" ]; then \
+	    printf '$(TERM_INFO)  export PATH="%s/infer/bin":$$PATH$(TERM_RESET)\n' "$(ABSOLUTE_ROOT_DIR)" >&2; \
+	  fi; \
+	  if [ "$$infer_repo_is_in_manpath" != "0" ]; then \
+	    printf '$(TERM_INFO)  export MANPATH="%s/infer/man":$$MANPATH$(TERM_RESET)\n' "$(ABSOLUTE_ROOT_DIR)" >&2; \
+	  fi; \
+	  if [ "$$infer_repo_is_in_path" != "0" ]; then \
+	    printf "$(TERM_INFO)  echo 'export PATH=\"%s/infer/bin\":\$$PATH' >> \"$$shell_config_file\"\n" "$(ABSOLUTE_ROOT_DIR)" >&2; \
+	  fi; \
+	  if [ "$$infer_repo_is_in_manpath" != "0" ]; then \
+	    printf "$(TERM_INFO)  echo 'export MANPATH=\"%s/infer/man\":\$$MANPATH' >> \"$$shell_config_file\"\n" "$(ABSOLUTE_ROOT_DIR)" >&2; \
+	  fi; \
+	fi
+	$(QUIET)PATH=$(ORIG_SHELL_PATH); if [ "$$(ocamlc -where 2>/dev/null)" != "$$($(OCAMLC) -where)" ]; then \
+	  echo >&2; \
+	  echo '$(TERM_INFO)*** NOTE: The current shell is not set up for the right opam switch.$(TERM_RESET)' >&2; \
+	  echo '$(TERM_INFO)*** NOTE: Please run:$(TERM_RESET)' >&2; \
+	  echo >&2; \
+	  echo '$(TERM_INFO)  eval $$(opam config env)$(TERM_RESET)' >&2; \
+	fi
+
 # print any variable for Makefile debugging
 print-%:
 	$(QUIET)echo '$*=$($*)'

Makefile.config

@@ -5,8 +5,11 @@
 # LICENSE file in the root directory of this source tree. An additional grant
 # of patent rights can be found in the PATENTS file in the same directory.
 
+ORIG_SHELL = $(shell echo "$$SHELL")
 SHELL = bash
 
+ORIG_SHELL_PATH = $(shell printf "%s" "$$PATH")
+
 # Make infer crash a bit more often to detect issues in the way we call infer within this repo, eg,
 # using deprecated options.
 export INFER_STRICT_MODE=1

build-infer.sh

@@ -31,9 +31,9 @@ function usage() {
   echo
   echo " options:"
   echo "   -h,--help             show this message"
+  echo "   --no-opam-lock        do not use the opam.lock file and let opam resolve dependencies"
   echo "   --only-setup-opam     initialize opam, install the opam dependencies of infer, and exit"
   echo "   --opam-switch         specify the opam switch where to install infer (default: $INFER_OPAM_SWITCH_DEFAULT)"
-  echo "   --no-opam-lock        do not use the opam.lock file and let opam resolve dependencies"
   echo "   -y,--yes              automatically agree to everything"
   echo
   echo " examples:"
@@ -125,6 +125,14 @@ check_installed () {
   fi
 }
 
+opam_failed () {
+    command=$1
+    echo
+    echo "*** ERROR: $command failed" >&2
+    echo "*** ERROR: Try running `opam update` then try this script again" >&2
+    exit 1
+}
+
 setup_opam () {
     opam init --compiler=$OCAML_VERSION -j $NCPU --no-setup
     opam switch set -j $NCPU $INFER_OPAM_SWITCH --alias-of $OCAML_VERSION
@@ -168,17 +176,11 @@ install_opam_deps() {
 
 echo "initializing opam... " >&2
 check_installed opam
-setup_opam
+setup_opam || opam_failed 'opam setup'
 eval $(SHELL=bash opam config env --switch=$INFER_OPAM_SWITCH)
 echo >&2
 echo "installing infer dependencies; this can take up to 30 minutes... " >&2
-install_opam_deps || ( \
-  echo >&2; \
-  echo '*** Failed to install opam dependencies' >&2; \
-  echo '*** Updating opam then retrying' >&2; \
-  opam update && \
-  install_opam_deps \
-)
+install_opam_deps || opam_failed 'installing opam dependencies'
 
 if [ "$ONLY_SETUP_OPAM" = "yes" ]; then
   exit 0
@@ -241,3 +243,9 @@ make -j $NCPU all || (
   echo "    $0 $ORIG_ARGS" >&2
   echo >&2
   exit 1)
+
+echo
+echo "*** Success! Infer is now built in '$SCRIPT_PATH/infer/bin/'."
+echo '*** Install infer on your system with `make install`.'
+echo
+echo '*** If you plan to hack on infer, check out CONTRIBUTING.md to setup your dev environment.'

configure.ac

@@ -202,7 +202,8 @@ AS_IF([test "$OPAM" != "no"], [
   AC_MSG_CHECKING([current opam switch])
   OPAMSWITCH=$("$OPAM" switch show)
   AC_MSG_RESULT([$OPAMSWITCH])
-])
+], [OPAMSWITCH=no])
+AC_SUBST([OPAMSWITCH])
 
 if test "x$enable_java_analyzers" = "xyes"; then
   AC_CHECK_TOOL([JAVA], [java], [no])