Adds support for opting out of telemetry via the DO_NOT_TRACK envirnment variable

[prologic]

Summary

As per title

• Fixes #7366
• Fixes #7401
• Fixes #7404

Component Name

area/packing

Additional Information

• Depends on #7847

[squash-labs]

Manage this branch in Squash

Test this branch here: https://prologicdo-not-track-zlmmf.squash.io

[ilyam8]

@prologic it is better to have code formatting changes in a separate PR or at least in a separate commit

[prologic]

@prologic it is better to have code formatting changes in a separate PR or at least in a separate commit

Yes I agree; Please review #7847 first; I can rebase on top of that. I'll have to remember to do this before I touch anything -- vim-autoformat is pretty magical ;)

[knatsakis]

I am approving but what about the shellcheck warnings?

Oh, I suppose those are fixed by #7847?

[prologic]

I am approving but what about the shellcheck warnings?

Oh, I suppose those are fixed by #7847?

Yes :D -- I created the PR to clean / fix what I was touching after the fact. Sorry about that! Once #7847 is merged I"ll rebase this!

Also FYI but the form if [ x"$foo" = x"bar" ]; then is actually the correct way to handle the edge-case where $foo can be blank. See this post: https://stackoverflow.com/questions/3093472/why-x-used-in-xvar-xvalue

I think this has a lot to do with some badly written Shells and the fact that on most systems [ and ] are actually separate programs/binaries you can find in /bin normally.

[prologic]

Rebased now #7847 is merged.

[prologic]

Tested that this works as expected:

/netdata # find / -type f -name '.opt-out-from-anonymous-statistics'
/etc/netdata/.opt-out-from-anonymous-statistics
/netdata # grep XXX /var/log/netdata/*
/var/log/netdata/error.log:2020-01-29 00:16:09: netdata INFO  : MAIN : XXX: anonymous statistics disabled