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nixos/netdata: copy apps_groups.conf instead of symlink

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Currently, it is not possible to configure `apps.plugin` via NixOS
option `services.netdata.configDir."apps_groups.conf"`. This is because
`apps.plugin` explicitly does not follow symbolic links when reading its
configuration from apps_groups.conf[^ref].

This change will copy that file instead of symlinking to address this.

Fixes #255161

[^ref]: 3849e70f93/src/collectors/apps.plugin/apps_plugin.c (L679)
This commit is contained in:
Daniel Sampliner 2024-11-15 18:02:26 -05:00
parent 5e2c2958b3
commit a61e43e18e
2 changed files with 14 additions and 2 deletions
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2
nixos/modules/services/monitoring/netdata.nix
View file

@ -27,7 +27,7 @@ let
mkdir $out
${concatStringsSep "\n" (mapAttrsToList (path: file: ''
mkdir -p "$out/$(dirname ${path})"
ln -s "${file}" "$out/${path}"
${if path == "apps_groups.conf" then "cp" else "ln -s"} "${file}" "$out/${path}"
'') cfg.configDir)}
'';

14
nixos/tests/netdata.nix
View file

@ -14,6 +14,10 @@ import ./make-test-python.nix ({ pkgs, ...} : {
services.netdata = {
enable = true;
python.recommendedPythonPackages = true;
configDir."apps_groups.conf" = pkgs.writeText "apps_groups.conf" ''
netdata_test: netdata
'';
};
};
};
@ -33,12 +37,20 @@ import ./make-test-python.nix ({ pkgs, ...} : {
# check if netdata can read disk ops for root owned processes.
# if > 0, successful. verifies both netdata working and
# apps.plugin has elevated capabilities.
url = "http://localhost:19999/api/v1/data\?chart=user.root_disk_physical_io"
url = "http://localhost:19999/api/v1/data?chart=user.root_disk_physical_io"
filter = '[.data[range(10)][2]] | add | . < 0'
cmd = f"curl -s {url} | jq -e '{filter}'"
netdata.wait_until_succeeds(cmd)
# check if the control socket is available
netdata.succeed("sudo netdatacli ping")
# check that custom groups in apps_groups.conf are used.
# if > 0, successful. verifies that user-specified apps_group.conf
# is used.
url = "http://localhost:19999/api/v1/data?chart=app.netdata_test_cpu_utilization"
filter = '[.data[range(10)][2]] | add | . > 0'
cmd = f"curl -s {url} | jq -e '{filter}'"
netdata.wait_until_succeeds(cmd, timeout=30)
'';
})