Error when use docker cp. open : permission denied

[snowc0de]

Dear developers

I recently installed a Mediawiki app with this command

sudo docker run -d -p 12345:80 --name andrewiki mediawiki

That works perfectly but I loose my LocalSettings.php file (nessessary to change basic variables)
So I run this :
cd /home/gene/DBak/Andrew Bennett/
sudo docker cp andrewiki:/var/www/html/LocalSettings.php .
And there is the output :
open /home/gene/DBak/Andrew Bennett/LocalSettings.php: permission denied

I search elsewhere to find other issue like this one, but I didn't found anything pertinent. So I try :
sudo chown 777 daemon:daemon .
But nothing. The issue continue.

Please help me, if you find other way to have LocalSettings.php I will be very thanks.

Thanks in advance.

SudoBash

[mannharleen]

same issue. anyone has any thoughts.
This happens when the docker user is non root. and when we perform docker cp, we sudo and try to copy into /home/.

Btw, it works when we do sudo docker cp x:y/z /root/

A workaround is to redirect stdout to a file on host filesystem:
sudo docker cp x:y/z - > logback.xml

[edward-agarwala]

I also have the same problem when the user is not root and sudo docker cp container:path/to/copy dest also works for me.

[FranzHuebner]

Same issue as @edward-agarwala and @mannharleen -> Temp. workaround for anyone stumbling upon this, is to copy the file to /tmp/ and move it from there.

[cpuguy83]

Seems like a straight forward problem with permissions.
If your user doesn't have access to the directory then docker can't copy to it.

[FranzHuebner]

Hey @cpuguy83 I use copy in a dockerfile for the same folder and this works flawless. Nevertheless after executing the container and pulling the result with docker cp from bash, the error appears. Every command is done without root permissions.

[cpuguy83]

The issue is not the container but the location you are copying to on the client side.

[cpuguy83]

Closing since this doesn't really look like a docker issue.

[MohamadHFallah]

Use sudo, ex : sudo docker cp 0e543d3f05:/home/crossTest /home

[ambatigan]

But using the 'sudo' is making the files to be with the owner as 'root', which is not good...
What else can be done to have the copied file as with non root user only?

[sim31]

I use sudo to execute this command and still get this error.

[ra0e]

Same here. Even using sudo does not slove the problem

[kurema]

Same. sudo doesn't work. I can copy to /tmp but I can't see the result.
I found out that it's because I am using snap version.

$ which docker
/snap/bin/docker

In that case, copy it to /tmp and you will find it in /tmp/snap.docker/tmp.

[DanielYWoo]

this is NOT an issue of docker, this is an issue of snap. please report this problem to snap. @chopin2712