Dockerfile: COPY / ADD with space character in path (Windows)

In Windows 10 (cmd) I'm trying to copy a file from a subfolder containing a space character in its name.

First I tried to use quotation marks:
```
FROM jfloff/alpine-python:2.7
COPY "Folder 1/File.txt" "Dir 1"
```
Error message:

failed to process "\"Folder": unexpected end of statement while looking for matching double-quote
"JSON" format (skipped the first line):
```
COPY ["Folder 1/File.txt" "Dir 1"]
```
Error message:

failed to process "[\"Folder": unexpected end of statement while looking for matching double-quote
Trying to escape with a single backslash:
```
COPY "Folder\ 1/File.txt" "Dir\ 1"
```
Error message:

failed to process "\"Folder\\": unexpected end of statement while looking for matching double-quote
Trying to escape with a double backslash:
```
COPY "Folder\\ 1/File.txt" "Dir\\ 1"
```
Error message:

failed to process "\"Folder\\\\": unexpected end of statement while looking for matching double-quote
Also tried a suggestion to use %20 instead of space:
```
COPY ["Folder%201/File.txt" "Dir%201"]
```
Error message:

COPY failed: no source File
Escape character replacement:
```
# escape=`
COPY "Folder` 1/File.txt" "Dir 1"
```
Error message:

failed to process "\"Folder`": unexpected end of statement while looking for matching double-quote
The same, but without quotes:
```
#escape=`
COPY Folder` 1/File.txt Dir` 1
```
Error message:

COPY failed: stat /var/lib/docker/tmp/docker-builder082039614/Folder: no such file or directory
Method with packing / unpacking using a tar archive (I'm not happy with that idea).

It should be possible, shouldn't it?

Solution

Maybe you can use ARG to help you, like this:

Dockerfile:

FROM jfloff/alpine-python:2.7
ARG src="Folder 1/File.txt"
ARG target="Dir 1/"
COPY ${src} ${target}

BTW, a / has to be add at the end of Dir 1 if you treat really want to treat it as a folder.

And, JSON format is also ok, just you miss ,, it should be:

FROM jfloff/alpine-python:2.7
COPY ["Folder 1/File.txt", "Dir 1/"]

Update for your comments:

In official guide, it said:

When copying files or directories that contain special characters (such as [ and ]), you need to escape those paths following the Golang rules to prevent them from being treated as a matching pattern.

So, for your case, it should be:

FROM jfloff/alpine-python:2.7
ARG src="[[]Folder 1]/__SLIM_TEMPLATE.mm"
ARG target="[Folder 1]/"
COPY ${src} ${target}

Or:

FROM jfloff/alpine-python:2.7
COPY ["[[]Folder 1]/__SLIM_TEMPLATE.mm", "[Folder 1]/"]