single quote escaping and json

The following Dockerfile fails to build:

FROM alpine
VOLUME ["/foo'bar"]
RUN ls

Result:

Step 1/3 : FROM alpine
 ---> 3fd9065eaf02
Step 2/3 : VOLUME ["/foo'bar"]
failed to process "/foo'bar": unexpected end of statement while looking for matching single-quote

This one works, but should produce a different result (i.e. it should create the directory foo\'bar instead of foo'bar):

FROM alpine
VOLUME ["/foo\\'bar"]
RUN ls

Result:

Step 1/3 : FROM alpine
 ---> 3fd9065eaf02
Step 2/3 : VOLUME ["/foo\\'bar"]
 ---> Running in 7067c0882c91
Removing intermediate container 7067c0882c91
 ---> ec5fda9a6b67
Step 3/3 : RUN ls
 ---> Running in 14ded6878716
bin
dev
etc
foo'bar
home
lib
media
mnt
proc
root
run
sbin
srv
sys
tmp
usr
var

Most probably the parser looks for single quotes before decoding the JSON array. The COPY and ADD instructions are affected too.

Start by reproducing the Dockerfile examples with JSON-array forms of VOLUME, then trace how the parser handles the affected VOLUME, COPY, and ADD instructions. Done means literal apostrophes build successfully, escaped apostrophes retain their distinct result, and regression coverage verifies both cases.