Remove direct dependency on google/cadvisor

third_party/forked/cadvisor/AUTHORS

@@ -0,0 +1,9 @@
+# This is the official list of cAdvisor authors for copyright purposes.
+
+# Names should be added to this file as
+#     Name or Organization <email address>
+# The email address is not required for organizations.
+
+# Please keep the list sorted.
+
+Google Inc.

third_party/forked/cadvisor/LICENSE

@@ -0,0 +1,190 @@
+   Copyright 2014 The cAdvisor Authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS

third_party/forked/cadvisor/README.md

@@ -0,0 +1 @@
+Forked from https://github.com/google/cadvisor/blob/8016f8ba96e74fb2001b121e0145dc2d0fe056e3/utils/tail/tail.go to support simple file tailing.

third_party/forked/cadvisor/tail/tail.go

@@ -0,0 +1,162 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package tail implements "tail -F" functionality following rotated logs
+package tail
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"k8s.io/klog"
+	inotify "k8s.io/utils/inotify"
+)
+
+type Tail struct {
+	reader     *bufio.Reader
+	readerErr  error
+	readerLock sync.RWMutex
+	filename   string
+	file       *os.File
+	stop       chan bool
+	watcher    *inotify.Watcher
+}
+
+const (
+	defaultRetryInterval = 100 * time.Millisecond
+	maxRetryInterval     = 30 * time.Second
+)
+
+// NewTail starts opens the given file and watches it for deletion/rotation
+func NewTail(filename string) (*Tail, error) {
+	t, err := newTail(filename)
+	if err != nil {
+		return nil, err
+	}
+	go t.watchLoop()
+	return t, nil
+}
+
+// newTail creates a Tail object.
+func newTail(filename string) (*Tail, error) {
+	t := &Tail{
+		filename: filename,
+	}
+	var err error
+	t.stop = make(chan bool)
+	t.watcher, err = inotify.NewWatcher()
+	if err != nil {
+		return nil, fmt.Errorf("inotify init failed on %s: %v", t.filename, err)
+	}
+	// Initialize readerErr as io.EOF, so that the reader can work properly
+	// during initialization.
+	t.readerErr = io.EOF
+	return t, nil
+}
+
+// Read implements the io.Reader interface for Tail
+func (t *Tail) Read(p []byte) (int, error) {
+	t.readerLock.RLock()
+	defer t.readerLock.RUnlock()
+	if t.readerErr != nil {
+		return 0, t.readerErr
+	}
+	return t.reader.Read(p)
+}
+
+var _ io.ReadCloser = &Tail{}
+
+// Close stops watching and closes the file
+func (t *Tail) Close() error {
+	close(t.stop)
+	return nil
+}
+
+func (t *Tail) attemptOpen() error {
+	t.readerLock.Lock()
+	defer t.readerLock.Unlock()
+	t.readerErr = nil
+	attempt := 0
+	var lastErr error
+	for interval := defaultRetryInterval; ; interval *= 2 {
+		attempt++
+		klog.V(4).Infof("Opening %s (attempt %d)", t.filename, attempt)
+		var err error
+		t.file, err = os.Open(t.filename)
+		if err == nil {
+			// TODO: not interested in old events?
+			// t.file.Seek(0, os.SEEK_END)
+			t.reader = bufio.NewReader(t.file)
+			return nil
+		}
+		lastErr = err
+		klog.V(4).Infof("open log file %s error: %v", t.filename, err)
+
+		if interval >= maxRetryInterval {
+			break
+		}
+		select {
+		case <-time.After(interval):
+		case <-t.stop:
+			t.readerErr = io.EOF
+			return fmt.Errorf("watch was cancelled")
+		}
+	}
+	err := fmt.Errorf("can't open log file %s: %v", t.filename, lastErr)
+	t.readerErr = err
+	return err
+}
+
+func (t *Tail) watchLoop() {
+	for {
+		err := t.watchFile()
+		if err != nil {
+			klog.Errorf("Tail failed on %s: %v", t.filename, err)
+			break
+		}
+	}
+}
+
+func (t *Tail) watchFile() error {
+	err := t.attemptOpen()
+	if err != nil {
+		return err
+	}
+	defer t.file.Close()
+
+	watchDir := filepath.Dir(t.filename)
+	err = t.watcher.AddWatch(watchDir, inotify.InMovedFrom|inotify.InDelete)
+	if err != nil {
+		return fmt.Errorf("Failed to add watch to directory %s: %v", watchDir, err)
+	}
+	defer t.watcher.RemoveWatch(watchDir)
+
+	for {
+		select {
+		case event := <-t.watcher.Event:
+			eventPath := filepath.Clean(event.Name) // Directory events have an extra '/'
+			if eventPath == t.filename {
+				klog.V(4).Infof("Log file %s moved/deleted", t.filename)
+				return nil
+			}
+		case <-t.stop:
+			return fmt.Errorf("watch was cancelled")
+		}
+	}
+}