Add BUILD_COMMIT to docker environment

BUILD_COMMIT not available directly from the repository, and may be useful for
later build steps.

docker_build_wrap.sh

@@ -2,9 +2,9 @@
 # Depends on:
 #   REPO_DIR
 #   PYTHON_VERSION
-#   BUILD_COMMIT
+#   BUILD_COMMIT (may be used by config.sh)
 #   UNICODE_WIDTH  (can be empty)
-#   BUILD_DEPENDS  (can be empty)
+#   BUILD_DEPENDS  (may be used by config.sh, can be empty)
 set -e
 
 # Unicode width, default 32
@@ -13,7 +13,7 @@ UNICODE_WIDTH=${UNICODE_WIDTH:-32}
 # Location of wheels, default "wheelhouse"
 WHEEL_SDIR=${WHEEL_SDIR:-wheelhouse}
 
-# Manylinux, openblas version, lex_ver, Python versions
+# Always pull in common and library builder utils
 MULTIBUILD_DIR=$(dirname "${BASH_SOURCE[0]}")
 # This next also sources common utils.
 source $MULTIBUILD_DIR/manylinux_utils.sh

travis_linux_steps.sh

@@ -36,6 +36,7 @@ function build_wheel {
     #     REPO_DIR  (or via input argument)
     #     PLAT (can be passed in as argument)
     #     MB_PYTHON_VERSION
+    #     BUILD_COMMIT
     #     UNICODE_WIDTH (optional)
     #     BUILD_DEPENDS (optional)
     #     MANYLINUX_URL (optional)
@@ -48,6 +49,7 @@ function build_wheel {
     docker run --rm \
         -e PYTHON_VERSION="$MB_PYTHON_VERSION" \
         -e UNICODE_WIDTH="$UNICODE_WIDTH" \
+        -e BUILD_COMMIT="$BUILD_COMMIT" \
         -e WHEEL_SDIR="$WHEEL_SDIR" \
         -e MANYLINUX_URL="$MANYLINUX_URL" \
         -e BUILD_DEPENDS="$BUILD_DEPENDS" \