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c#linuxdockerasp.net-core.net-core
Mikeon
Mikeon

Reputation: 10749

How to Distinguish between mounted volume and image native directory in Docker

If I mount a volume in docker

docker run -v /folder1:/folder1 [imageid]

Is there a way in code to tell /folder1 is a mounted volume and not an image native folder?

Like 

new DirectoryInfo("/folder1")

Upvotes: 0

Views: 165

Answers (2)

Mikeon
Mikeon

Reputation: 10749

found in Microsoft's github repository:

https://github.com/aspnet/DataProtection/blob/master/src/Microsoft.AspNetCore.DataProtection/Internal/DockerUtils.cs

Upvotes: 0

menya
menya

Reputation: 1525

I am not familar with C#, but if you can access file under /proc, you can check file /proc/self/mountinfo.

If a dir is from image itself, it is mount as overlay.

If a dir is create at runtime, it is mount as proc | tmpfs | sysfs | devpts | mqueue | cgroup.

If we exclude these mount type, the rest of lines in /proc/self/mountinfo will be the volume you mount. In short, this command works in my situation: 

cat /proc/self/mountinfo | grep -v 'proc\|tmpfs\|sysfs\|devpts\|mqueue\|cgroup\|overlay'

Upvotes: 1

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