Add shared drive mounts inside /mnt

[marfillaster]

Expected behavior

PS C:\Users\me> bash
/mnt/c/Users/me$ touch test.txt
/mnt/c/Users/me$ [ -f "text.txt" ] &&  echo 1 || echo 0
1
/mnt/c/Users/me$ export DOCKER_HOST=tcp://127.0.0.1:2375
/mnt/c/Users/me$  docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Mon Mar 27 17:14:09 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.06.0-ce
 API version:  1.30 (minimum version 1.12)
 Go version:   go1.8.3
 Git commit:   02c1d87
 Built:        Fri Jun 23 21:51:55 2017
 OS/Arch:      linux/amd64
 Experimental: true

/mnt/c/Users/me$ docker run -rm -v$(pwd):/var/tmp -it ubuntu \
/bin/bash  [ -f "text.txt" ] &&  echo 1 || echo 0
1

Actual behavior

/mnt/c/Users/me$ docker run -rm -v$(pwd):/var/tmp -it ubuntu \
/bin/bash  -c '[ -f "/var/tmp/text.txt" ] &&  echo 1 || echo 0'
0

/mnt/c/Users/me$ docker run -rm -v./:/var/tmp -it ubuntu \
/bin/bash  -c '[ -f "/var/tmp/text.txt" ] &&  echo 1 || echo 0'
0

/mnt/c/Users/me$ docker run -rm -v$/mnt/c/Users/me:/var/tmp -it ubuntu \
/bin/bash  -c '[ -f "/var/tmp/text.txt" ] &&  echo 1 || echo 0'
0

/mnt/c/Users/me$ docker run -rm -v/c/Users/me:/var/tmp -it ubuntu \
/bin/bash  -c '[ -f "/var/tmp/text.txt" ] &&  echo 1 || echo 0'
1

As you can see, using pwd is not ideal. But if in moby /c is also available in /mnt/c, working with docker in wsl is going to be more fun.

[beiriannydd]

In the meantime you might like to install this in /usr/local/bin/docker and hash -r (assuming that /usr/local/bin is earlier in your path than /usr/bin, and docker is in /usr/bin which it is in my default wsl install). The other thing this shim does is add an extra leading / to non /mnt paths which seems to be necessary to properly have them interpreted as "from the linux VM"

#!/bin/bash
cmd=()
stripmount=0
for arg in "$@"; do
  if [ "$stripmount" -eq 1 ]; then
    new="${arg//\/mnt/}"
    if [ "$new" = "$arg" ]; then
      arg="/$arg"
    else
      arg="$new"
    fi
    stripmount=0
  fi
  case "$arg" in
    -v|-w)
        stripmount=1
        ;;
  esac
  cmd+=("$arg")
done
exec /usr/bin/docker "${cmd[@]}"

[marfillaster]

Insider build 17093 has introduced a way of mounting to a custom root directory.

[automount]
root = /host_mnt/

Using docker-ce 17.12.0-ce-win47 and the new wsl root, $(pwd -P) is now usable for -v mapping.

[docker-robott]

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