release.sh still needs to run from PEX

Change how we handle env var to not use PEX when first bootstrapping, then use it in the followup release.sh command.

.travis.yml

@@ -385,7 +385,7 @@ cargo_audit: &cargo_audit
 base_build_wheels: &base_build_wheels
   stage: *test
   env:
-    - &base_build_wheels_env RUN_PANTS_FROM_PEX=1 PREPARE_DEPLOY=1
+    - &base_build_wheels_env PREPARE_DEPLOY=1
 
 py27_linux_build_wheels_no_ucs: &py27_linux_build_wheels_no_ucs
   # Similar to the bootstrap shard, we build Linux wheels in a docker image to maximize
@@ -401,7 +401,6 @@ py27_linux_build_wheels_ucs2: &py27_linux_build_wheels_ucs2
   env:
     - *py27_linux_test_config_env
     - *base_build_wheels_env
-    - RUN_PANTS_FROM_PEX=0
     - CACHE_NAME=linuxwheelsbuild.ucs2
   script:
     - docker build --rm -t travis_ci_py27_ucs2
@@ -414,7 +413,7 @@ py27_linux_build_wheels_ucs2: &py27_linux_build_wheels_ucs2
       -v "${HOME}:/travis/home"
       -v "${TRAVIS_BUILD_DIR}:/travis/workdir"
       travis_ci_py27_ucs2:latest
-      sh -c "./build-support/bin/ci.sh -2b && ./build-support/bin/release.sh -n"
+      sh -c "RUN_PANTS_FROM_PEX=0 ./build-support/bin/ci.sh -2b && RUN_PANTS_FROM_PEX=1 ./build-support/bin/release.sh -n"
 
 py27_linux_build_wheels_ucs4: &py27_linux_build_wheels_ucs4
   <<: *py27_linux_build_wheels_no_ucs
@@ -461,7 +460,6 @@ py27_osx_build_wheels_ucs4: &py27_osx_build_wheels_ucs4
     - PATH="/usr/local/opt/openssl/bin:$PATH" LDFLAGS="-L/usr/local/opt/openssl/lib" CPPFLAGS="-I/usr/local/opt/openssl/include" PYENV_ROOT="${HOME}/.pyenv" PATH="${PYENV_ROOT}/shims:${PATH}"
 
     - PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs4
-    - RUN_PANTS_FROM_PEX=0
   before_install:
     - curl -L https://github.com/stedolan/jq/releases/download/jq-1.5/jq-osx-amd64 -o /usr/local/bin/jq
     - chmod 755 /usr/local/bin/jq
@@ -470,8 +468,8 @@ py27_osx_build_wheels_ucs4: &py27_osx_build_wheels_ucs4
     - ${PYENV_ROOT}/bin/pyenv install 2.7.13
     - ${PYENV_ROOT}/bin/pyenv global 2.7.13
   script:
-    - ./build-support/bin/ci.sh -2b
-    - ./build-support/bin/release.sh -n
+    - RUN_PANTS_FROM_PEX=0 ./build-support/bin/ci.sh -2b
+    - RUN_PANTS_FROM_PEX=1 ./build-support/bin/release.sh -n
 
 # -------------------------------------------------------------------------
 # Rust tests

build-support/travis/travis.yml.mustache

@@ -364,7 +364,7 @@ cargo_audit: &cargo_audit
 base_build_wheels: &base_build_wheels
   stage: *test
   env:
-    - &base_build_wheels_env RUN_PANTS_FROM_PEX=1 PREPARE_DEPLOY=1
+    - &base_build_wheels_env PREPARE_DEPLOY=1
 
 py27_linux_build_wheels_no_ucs: &py27_linux_build_wheels_no_ucs
   # Similar to the bootstrap shard, we build Linux wheels in a docker image to maximize
@@ -380,7 +380,6 @@ py27_linux_build_wheels_ucs2: &py27_linux_build_wheels_ucs2
   env:
     - *py27_linux_test_config_env
     - *base_build_wheels_env
-    - RUN_PANTS_FROM_PEX=0
     - CACHE_NAME=linuxwheelsbuild.ucs2
   script:
     - docker build --rm -t travis_ci_py27_ucs2
@@ -393,7 +392,7 @@ py27_linux_build_wheels_ucs2: &py27_linux_build_wheels_ucs2
       -v "${HOME}:/travis/home"
       -v "${TRAVIS_BUILD_DIR}:/travis/workdir"
       travis_ci_py27_ucs2:latest
-      sh -c "./build-support/bin/ci.sh -2b && ./build-support/bin/release.sh -n"
+      sh -c "RUN_PANTS_FROM_PEX=0 ./build-support/bin/ci.sh -2b && RUN_PANTS_FROM_PEX=1 ./build-support/bin/release.sh -n"
 
 py27_linux_build_wheels_ucs4: &py27_linux_build_wheels_ucs4
   <<: *py27_linux_build_wheels_no_ucs
@@ -439,15 +438,14 @@ py27_osx_build_wheels_ucs4: &py27_osx_build_wheels_ucs4
     - CACHE_NAME=osxwheelsbuild.ucs4
     - {{>env_osx_with_pyenv}}
     - PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs4
-    - RUN_PANTS_FROM_PEX=0
   before_install:
     {{>before_install_osx}}
     - git clone https://github.com/pyenv/pyenv ${PYENV_ROOT}
     - ${PYENV_ROOT}/bin/pyenv install 2.7.13
     - ${PYENV_ROOT}/bin/pyenv global 2.7.13
   script:
-    - ./build-support/bin/ci.sh -2b
-    - ./build-support/bin/release.sh -n
+    - RUN_PANTS_FROM_PEX=0 ./build-support/bin/ci.sh -2b
+    - RUN_PANTS_FROM_PEX=1 ./build-support/bin/release.sh -n
 
 # -------------------------------------------------------------------------
 # Rust tests