48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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//go:build linux
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package fingerprint
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import (
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"fmt"
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)
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const (
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cgroupAvailable = "available"
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)
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// Fingerprint tries to find a valid cgroup mount point and the version of cgroups
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// if a mount-point is present.
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func (f *CGroupFingerprint) Fingerprint(req *FingerprintRequest, resp *FingerprintResponse) error {
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mount, err := f.mountPointDetector.MountPoint()
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if err != nil {
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f.clearCGroupAttributes(resp)
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return fmt.Errorf("failed to discover cgroup mount point: %s", err)
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}
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// Check if a cgroup mount point was found.
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if mount == "" {
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f.clearCGroupAttributes(resp)
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if f.lastState == cgroupAvailable {
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f.logger.Warn("cgroups are now unavailable")
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}
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f.lastState = cgroupUnavailable
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return nil
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}
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// Check the version in use.
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version := f.versionDetector.CgroupVersion()
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resp.AddAttribute(cgroupMountPointAttribute, mount)
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resp.AddAttribute(cgroupVersionAttribute, version)
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resp.Detected = true
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if f.lastState == cgroupUnavailable {
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f.logger.Info("cgroups are available")
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}
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f.lastState = cgroupAvailable
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return nil
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}
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