Docker mounted volume adds ;C to end of windows path when translating from linux style path

So with some extra digging I found these three threads, related to git-bash mucking up docker mount:

https://forums.docker.com/t/weird-error-under-git-bash-msys-solved/9210 https://github.com/moby/moby/issues/24029#issuecomment-250412919

When I look up mingw's documentation on the path conversion git-bash is using, I find this table of syntax: http://www.mingw.org/wiki/Posix_path_conversion

One of which outputs in the format: x;x;C:\MinGW\msys\1.0\x. Note the ;C in it. If git-bash is trying to be clever, stuffing up the syntax and outputting a path with this format, this would explain it.

Solution is to escape the path conversion, using by prefixing with /. So the working docker command to run docker from git-bash with present working directory:

docker run -it --rm -v /${PWD}:/wkDir $IMAGE_TAG yarn dev

Mounting the current directory into a Docker container in Windows 10 from Git Bash (MinGW) may fail due to a POSIX path conversion. Any path starting with / is converted to a valid Windows path.

touch test.txt
docker run --rm -v $(pwd):/data busybox ls -la /data/test.txt
# ls: C:/Git/data/test.txt: No such file or directory

Escape the POSIX paths by prefixing with /

To skip the path conversion, all POSIX paths have to be prefixed with the extra leading slash (/), including /$(pwd).

touch test.txt
docker run --rm -v /$(pwd):/data busybox ls -la //data/test.txt
# -rwxr-xr-x    1 root     root             0 Jun 22 23:45 //data/test.txt

In Git Bash the path //data/test.txt is not converted and in Linux shells // (leading double slash) is ignored and treated the same way as /.

Disable the path conversion

Disable the POSIX path conversion in Git Bash (MinGW) using MSYS_NO_PATHCONV environment variable.

The path conversion can be disabled at the command level:

touch test.txt
MSYS_NO_PATHCONV=1 docker run --rm -v $(pwd):/data busybox ls -la /data/test.txt
# -rwxr-xr-x    1 root     root             0 Jun 22 23:45 /data/test.txt

The path conversion can be disabled at the shell (or system) level:

export MSYS_NO_PATHCONV=1
touch test.txt
docker run --rm -v $(pwd):/data busybox ls -la /data/test.txt
# -rwxr-xr-x    1 root     root             0 Jun 22 23:45 /data/test.txt

For me the solution was simply to include a closing slash / at end of any paths.

E.g. instead of

/opt/apache-atlas-2.0.0/bin/atlas_start.py

...use

/opt/apache-atlas-2.0.0/bin/atlas_start.py/

Tags:

Docker

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