Remove BUNDLE_BIN and add GEM_HOME/bin back to PATH

See #208 (comment)
docker-library · May 21, 2018 · 928d3bc · 928d3bc
1 parent 395cce4
commit 928d3bc
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Showing 24 changed files with 104 additions and 96 deletions.
diff --git a/2.2/alpine3.4/Dockerfile b/2.2/alpine3.4/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.2/jessie/Dockerfile b/2.2/jessie/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.2/jessie/slim/Dockerfile b/2.2/jessie/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.3/alpine3.4/Dockerfile b/2.3/alpine3.4/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.3/jessie/Dockerfile b/2.3/jessie/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.3/jessie/slim/Dockerfile b/2.3/jessie/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.3/stretch/Dockerfile b/2.3/stretch/Dockerfile
@@ -68,12 +68,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.3/stretch/slim/Dockerfile b/2.3/stretch/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.4/alpine3.4/Dockerfile b/2.4/alpine3.4/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.4/alpine3.6/Dockerfile b/2.4/alpine3.6/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.4/alpine3.7/Dockerfile b/2.4/alpine3.7/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.4/jessie/Dockerfile b/2.4/jessie/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.4/jessie/slim/Dockerfile b/2.4/jessie/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.4/stretch/Dockerfile b/2.4/stretch/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.4/stretch/slim/Dockerfile b/2.4/stretch/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.5/alpine3.7/Dockerfile b/2.5/alpine3.7/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.5/stretch/Dockerfile b/2.5/stretch/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.5/stretch/slim/Dockerfile b/2.5/stretch/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.6-rc/alpine3.7/Dockerfile b/2.6-rc/alpine3.7/Dockerfile
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/2.6-rc/stretch/Dockerfile b/2.6-rc/stretch/Dockerfile
@@ -66,12 +66,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/2.6-rc/stretch/slim/Dockerfile b/2.6-rc/stretch/slim/Dockerfile
@@ -92,12 +92,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
@@ -101,12 +101,13 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" \
+	&& chmod 777 "$GEM_HOME"
+# (BUNDLE_PATH = GEM_HOME, no need to mkdir/chown both)
 
 CMD [ "irb" ]
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
@@ -68,12 +68,12 @@ RUN set -ex \
 # and don't create ".bundle" in all our apps
 ENV GEM_HOME /usr/local/bundle
 ENV BUNDLE_PATH="$GEM_HOME" \
-	BUNDLE_BIN="$GEM_HOME/bin" \
 	BUNDLE_SILENCE_ROOT_WARNING=1 \
 	BUNDLE_APP_CONFIG="$GEM_HOME"
 # path recommendation: https://github.com/bundler/bundler/pull/6469#issuecomment-383235438
-ENV PATH $BUNDLE_PATH/gems/bin:$PATH
-RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
-	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+ENV PATH $GEM_HOME/bin:$BUNDLE_PATH/gems/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin" \
+	&& chmod 777 "$GEM_HOME" "$GEM_HOME/bin" "$BUNDLE_PATH/gems/bin"
 
 CMD [ "irb" ]