tty workaround (side benefit: cleaner RUN scripts)

Dockerfile

@@ -34,7 +34,9 @@ RUN export DEBIAN_FRONTEND=noninteractive \
     && dpkg-reconfigure locales \
     && update-locale LANG=${__LANG} LANGUAGE=${__LANGUAGE} LC_ALL=${__LC_ALL} \
     && unset DEBIAN_FRONTEND \
-    && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/* \
+    && mkdir -p /usr/share/terminfo/d \
+    && ln -s /lib/terminfo/d/dumb /usr/share/terminfo/d/dumb
 ENV LANG=${__LANG}
 SHELL ["/bin/sh", "-c"]
 
@@ -93,6 +95,7 @@ ARG NPM_VERSION
 ARG NVM_VERSION
 SHELL ["/bin/bash", "-c"]
 RUN adduser --disabled-password --shell /bin/bash --gecos "" embark \
+    && usermod -a -G tty embark \
     && mkdir -p /dapp \
     && chown embark:embark /dapp \
     && curl -fsSLO --compressed "https://bootstrap.pypa.io/get-pip.py" \

README.md

@@ -261,7 +261,7 @@ echo $1
 # a comment
 echo $2
 echo $3
-eval echo \\\$\$3
+eval echo \$$3
 # another comment
 ```
 Invoke with:

env/docker-entrypoint.sh

@@ -3,4 +3,5 @@
 export BASH_ENV=/home/embark/.bash_env
 
 chmod a+w /dev/std*
+chmod g+r /dev/pts/0
 exec su-exec embark user-entrypoint.sh "$@"

run.sh

@@ -141,17 +141,21 @@ run_embark () {
         fi
 
         local run_script=$(< "$EMBARK_DOCKER_RUN")
-# do not add indentation to lines below
-        run_script="exec bash -s ${cmd[@]} << 'SCRIPT'
-td=\$(mktemp -d)
-cat << 'RUN' > \$td/run_script
-$run_script
-RUN
-chmod +x \$td/run_script
-exec \$td/run_script \$@
-SCRIPT
-"
-# do not add indentation to lines above
+        # do not alter indentation, tabs in lines below
+        run_script=$(cat <<- RUN_SCRIPT
+	exec bash -${i_flag}s \$(tty) ${cmd[@]} << 'SCRIPT'
+	__tty=\$1
+	shift
+	td=\$(mktemp -d)
+	cat << 'RUN' > \$td/run_script
+	$run_script
+	RUN
+	chmod +x \$td/run_script
+	exec \$td/run_script \$@ < \$__tty
+	SCRIPT
+	RUN_SCRIPT
+        )
+        # do not alter indentation, tabs in lines above
         cmd=( "bash" "-${i_flag}c" "$run_script" )
     fi