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fingerprint: add fingerprinting for CNI plugins presense and version
This PR adds a fingerprinter to set the attributes "cni.plugins" -> "true" or "false" if <cni_path> contains CNI plugins "cni.plugins.version" -> version of the CNI plugins if present
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```release-note:improvement | ||
fingerprint: Add fingerprinting for CNI containernetworking plugins | ||
``` |
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package fingerprint | ||
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import ( | ||
"context" | ||
"os" | ||
"os/exec" | ||
"path/filepath" | ||
"strings" | ||
"time" | ||
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"github.com/hashicorp/go-hclog" | ||
) | ||
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const ( | ||
defaultCNIPath = "/opt/cni/bin" | ||
) | ||
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// PluginsCNIFingerprint creates a fingerprint of the CNI plugins present on the | ||
// CNI plugin path specified for the Nomad client. | ||
type PluginsCNIFingerprint struct { | ||
StaticFingerprinter | ||
logger hclog.Logger | ||
lister func(string) ([]os.DirEntry, error) | ||
} | ||
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func NewPluginsCNIFingerprint(logger hclog.Logger) Fingerprint { | ||
return &PluginsCNIFingerprint{ | ||
logger: logger.Named("cni_plugins"), | ||
lister: os.ReadDir, | ||
} | ||
} | ||
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func (f *PluginsCNIFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error { | ||
cniPath := req.Config.CNIPath | ||
if cniPath == "" { | ||
cniPath = defaultCNIPath | ||
} | ||
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entries, err := f.lister(cniPath) | ||
switch { | ||
case err != nil: | ||
f.logger.Debug("failed to read CNI plugins directory", "cni_path", cniPath, "error", err) | ||
resp.Detected = false | ||
resp.AddAttribute("cni.plugins", "false") | ||
return nil | ||
case len(entries) == 0: | ||
f.logger.Debug("no CNI plugins found", "cni_path", cniPath) | ||
resp.Detected = true | ||
resp.AddAttribute("cni.plugins", "false") | ||
return nil | ||
} | ||
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bridgePath := filepath.Join(cniPath, "bridge") | ||
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second) | ||
defer cancel() | ||
cmd := exec.CommandContext(ctx, bridgePath, "--version") | ||
output, err := cmd.CombinedOutput() | ||
if err != nil { | ||
f.logger.Debug("failed to detect CNI plugins version", "error", err) | ||
resp.AddAttribute("cni.plugins", "false") | ||
return nil | ||
} | ||
tokens := strings.Fields(string(output)) | ||
version := tokens[len(tokens)-1] | ||
f.logger.Debug("detected CNI plugins", "version", version) | ||
resp.AddAttribute("cni.plugins", "true") | ||
resp.AddAttribute("cni.plugins.version", version) | ||
resp.Detected = true | ||
return nil | ||
} |
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package fingerprint | ||
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import ( | ||
"os" | ||
"testing" | ||
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"github.com/hashicorp/nomad/ci" | ||
"github.com/hashicorp/nomad/client/config" | ||
"github.com/hashicorp/nomad/helper/testlog" | ||
"github.com/shoenig/test/must" | ||
) | ||
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func TestPluginsCNIFingerprint_Fingerprint_present(t *testing.T) { | ||
ci.Parallel(t) | ||
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f := NewPluginsCNIFingerprint(testlog.HCLogger(t)) | ||
request := &FingerprintRequest{ | ||
Config: &config.Config{ | ||
CNIPath: "./test_fixtures/cni", | ||
}, | ||
} | ||
response := new(FingerprintResponse) | ||
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err := f.Fingerprint(request, response) | ||
must.NoError(t, err) | ||
must.True(t, response.Detected) | ||
must.Eq(t, "true", response.Attributes["cni.plugins"]) | ||
must.StrHasPrefix(t, "v1.0.2", response.Attributes["cni.plugins.version"]) | ||
} | ||
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func TestPluginsCNIFingerprint_Fingerprint_absent(t *testing.T) { | ||
ci.Parallel(t) | ||
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f := NewPluginsCNIFingerprint(testlog.HCLogger(t)) | ||
request := &FingerprintRequest{ | ||
Config: &config.Config{ | ||
CNIPath: "/does/not/exist", | ||
}, | ||
} | ||
response := new(FingerprintResponse) | ||
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err := f.Fingerprint(request, response) | ||
must.False(t, response.Detected) | ||
must.NoError(t, err) | ||
must.Eq(t, "false", response.Attributes["cni.plugins"]) | ||
} | ||
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func TestPluginsCNIFingerprint_Fingerprint_empty(t *testing.T) { | ||
ci.Parallel(t) | ||
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lister := func(string) ([]os.DirEntry, error) { | ||
return nil, nil | ||
} | ||
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f := NewPluginsCNIFingerprint(testlog.HCLogger(t)) | ||
f.(*PluginsCNIFingerprint).lister = lister | ||
request := &FingerprintRequest{ | ||
Config: new(config.Config), | ||
} | ||
response := new(FingerprintResponse) | ||
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err := f.Fingerprint(request, response) | ||
must.NoError(t, err) | ||
must.True(t, response.Detected) | ||
must.Eq(t, "false", response.Attributes["cni.plugins"]) | ||
} |
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#!/bin/sh | ||
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echo "CNI bridge plugin v1.0.2" |