Merge pull request #20321 from containers/renovate/github.com-nxadm-tail-1.x

fix(deps): update module github.com/nxadm/tail to v1.4.11

vendor/github.com/nxadm/tail/.cirrus.yml

@@ -0,0 +1,8 @@
+task:
+  name: FreeBSD
+  freebsd_instance:
+      image_family: freebsd-12-2
+  install_script: pkg install -y go
+  script: |
+    go build
+    go test -v -race -timeout 2m ./...

vendor/github.com/nxadm/tail/.gitignore

@@ -1,3 +1,2 @@
 .idea/
-.test/
-examples/_*
+examples/_*

vendor/github.com/nxadm/tail/CHANGES.md

@@ -1,7 +1,15 @@
+# Version v1.4.11
+* Bump fsnotify to v1.6.0. Should fix some issues.
+
+# Version v1.4.9
+* Bump fsnotify to v1.5.1 fixes issue #28, hpcloud/tail#90.
+* PR #27: "Add timeout to tests"by @kokes++. Also timeout on FreeBSD.
+* PR #29: "Use temp directory for tests, instead of relative" by @ches++.
+
 # Version v1.4.7-v1.4.8
 * Documentation updates.
 * Small linter cleanups.
-* Added example in test. 
+* Added example in test.
 
 # Version v1.4.6
 

vendor/github.com/nxadm/tail/CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# Contributing
+Comments (at Discussions), Issues and PRs are always welcome. In the case of issues,
+code examples make it easier to reproduce the problem. In the case of PRs add tests
+if applicable so we make sure nothing breaks for people using the library on different
+OSes.

vendor/github.com/nxadm/tail/README.md

@@ -1,12 +1,13 @@
-![ci](https://github.com/nxadm/tail/workflows/ci/badge.svg)[![Go Reference](https://pkg.go.dev/badge/github.com/nxadm/tail.svg)](https://pkg.go.dev/github.com/nxadm/tail)
-
+[![Go Reference](https://pkg.go.dev/badge/github.com/nxadm/tail.svg)](https://pkg.go.dev/github.com/nxadm/tail#section-documentation)
+![ci](https://github.com/nxadm/tail/workflows/ci/badge.svg)
+[![FreeBSD](https://api.cirrus-ci.com/github/nxadm/tail.svg)](https://cirrus-ci.com/github/nxadm/tail)
 # tail functionality in Go
 
 nxadm/tail provides a Go library that emulates the features of the BSD `tail`
 program. The library comes with full support for truncation/move detection as
 it is designed to work with log rotation tools. The library works on all
-operating systems supported by Go, including POSIX systems like Linux and
-*BSD, and MS Windows. Go 1.9 is the oldest compiler release supported.
+operating systems supported by Go, including POSIX systems like Linux, *BSD,
+MacOS, and MS Windows. Go 1.12 is the oldest compiler release supported.
 
 A simple example:
 
@@ -24,7 +25,7 @@ for line := range t.Lines {
 }
 ```
 
-See [API documentation](https://pkg.go.dev/github.com/nxadm/tail).
+See [API documentation](https://pkg.go.dev/github.com/nxadm/tail#section-documentation).
 
 ## Installing
 
@@ -41,4 +42,4 @@ nxadm/tail continues the development by keeping up to date with the Go toolchain
 and fixing bugs.
 
 ## Examples
-Examples, e.g. used to debug an issue, are kept in the [examples directory](/examples).
+Examples, e.g. used to debug an issue, are kept in the [examples directory](/examples).

vendor/github.com/nxadm/tail/tail.go

@@ -77,8 +77,9 @@ type Config struct {
 	Pipe      bool      // The file is a named pipe (mkfifo)
 
 	// Generic IO
-	Follow      bool // Continue looking for new lines (tail -f)
-	MaxLineSize int  // If non-zero, split longer lines into multiple lines
+	Follow        bool // Continue looking for new lines (tail -f)
+	MaxLineSize   int  // If non-zero, split longer lines into multiple lines
+	CompleteLines bool // Only return complete lines (that end with "\n" or EOF when Follow is false)
 
 	// Optionally, use a ratelimiter (e.g. created by the ratelimiter/NewLeakyBucket function)
 	RateLimiter *ratelimiter.LeakyBucket
@@ -97,6 +98,8 @@ type Tail struct {
 	reader  *bufio.Reader
 	lineNum int
 
+	lineBuf *strings.Builder
+
 	watcher watch.FileWatcher
 	changes *watch.FileChanges
 
@@ -128,6 +131,10 @@ func TailFile(filename string, config Config) (*Tail, error) {
 		Config:   config,
 	}
 
+	if config.CompleteLines {
+		t.lineBuf = new(strings.Builder)
+	}
+
 	// when Logger was not specified in config, use default logger
 	if t.Logger == nil {
 		t.Logger = DefaultLogger
@@ -202,6 +209,9 @@ func (tail *Tail) closeFile() {
 }
 
 func (tail *Tail) reopen() error {
+	if tail.lineBuf != nil {
+		tail.lineBuf.Reset()
+	}
 	tail.closeFile()
 	tail.lineNum = 0
 	for {
@@ -229,16 +239,32 @@ func (tail *Tail) readLine() (string, error) {
 	tail.lk.Lock()
 	line, err := tail.reader.ReadString('\n')
 	tail.lk.Unlock()
-	if err != nil {
+
+	newlineEnding := strings.HasSuffix(line, "\n")
+	line = strings.TrimRight(line, "\n")
+
+	// if we don't have to handle incomplete lines, we can return the line as-is
+	if !tail.Config.CompleteLines {
 		// Note ReadString "returns the data read before the error" in
 		// case of an error, including EOF, so we return it as is. The
 		// caller is expected to process it if err is EOF.
 		return line, err
 	}
 
-	line = strings.TrimRight(line, "\n")
+	if _, err := tail.lineBuf.WriteString(line); err != nil {
+		return line, err
+	}
 
-	return line, err
+	if newlineEnding {
+		line = tail.lineBuf.String()
+		tail.lineBuf.Reset()
+		return line, nil
+	} else {
+		if tail.Config.Follow {
+			line = ""
+		}
+		return line, io.EOF
+	}
 }
 
 func (tail *Tail) tailFileSync() {