From 1bb82afcf6389667d33ebace93e3fbc74e6d1ddb Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sun, 15 Mar 2015 14:24:58 +0100
Subject: [PATCH] Add tests for bug #101

---
 pipe/pipe.go                           | 41 ++++++++++++++++++++++----
 testsuite/test-backup-missing-file.sh  | 16 ----------
 testsuite/test-backup-missing-file1.sh | 16 ++++++++++
 testsuite/test-backup-missing-file2.sh | 16 ++++++++++
 4 files changed, 68 insertions(+), 21 deletions(-)
 delete mode 100755 testsuite/test-backup-missing-file.sh
 create mode 100755 testsuite/test-backup-missing-file1.sh
 create mode 100755 testsuite/test-backup-missing-file2.sh

diff --git a/pipe/pipe.go b/pipe/pipe.go
index 4ff380d3e..b301af60d 100644
--- a/pipe/pipe.go
+++ b/pipe/pipe.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"path"
 	"path/filepath"
 	"sort"
 
@@ -82,13 +83,13 @@ func isFile(fi os.FileInfo) bool {
 
 var errCancelled = errors.New("walk cancelled")
 
-func walk(basedir, path string, done chan struct{}, jobs chan<- Job, res chan<- Result) error {
-	info, err := os.Lstat(path)
+func walk(basedir, dir string, done chan struct{}, jobs chan<- Job, res chan<- Result) error {
+	info, err := os.Lstat(dir)
 	if err != nil {
 		return err
 	}
 
-	relpath, _ := filepath.Rel(basedir, path)
+	relpath, _ := filepath.Rel(basedir, dir)
 
 	if !info.IsDir() {
 		select {
@@ -99,15 +100,29 @@ func walk(basedir, path string, done chan struct{}, jobs chan<- Job, res chan<-
 		return nil
 	}
 
-	names, err := readDirNames(path)
+	names, err := readDirNames(dir)
 	if err != nil {
 		return err
 	}
 
+	// Insert breakpoint to allow testing behaviour with vanishing files
+	// between Readdir() and lstat()
+	debug.BreakIf("pipe.walk1", func() bool {
+		match, err := path.Match(os.Getenv("DEBUG_BREAK_PIPE"), relpath)
+		if err != nil {
+			panic(err)
+		}
+		if match {
+			debug.Log("break", "break pattern matches for %v\n", relpath)
+		}
+
+		return match
+	})
+
 	entries := make([]<-chan Result, 0, len(names))
 
 	for _, name := range names {
-		subpath := filepath.Join(path, name)
+		subpath := filepath.Join(dir, name)
 
 		ch := make(chan Result, 1)
 		entries = append(entries, ch)
@@ -122,6 +137,22 @@ func walk(basedir, path string, done chan struct{}, jobs chan<- Job, res chan<-
 			continue
 		}
 
+		// Insert breakpoint to allow testing behaviour with vanishing files
+		// between walk and open
+		debug.BreakIf("pipe.walk2", func() bool {
+			p := filepath.Join(relpath, name)
+
+			match, err := path.Match(os.Getenv("DEBUG_BREAK_PIPE"), p)
+			if err != nil {
+				panic(err)
+			}
+			if match {
+				debug.Log("break", "break pattern matches for %v\n", p)
+			}
+
+			return match
+		})
+
 		if isDir(fi) {
 			err = walk(basedir, subpath, done, jobs, ch)
 			if err != nil {
diff --git a/testsuite/test-backup-missing-file.sh b/testsuite/test-backup-missing-file.sh
deleted file mode 100755
index 996669fdf..000000000
--- a/testsuite/test-backup-missing-file.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-set -em
-
-# setup restic
-prepare
-run restic init
-
-# start backup, break before saving files
-DEBUG_BREAK=Archiver.Snapshot run restic.debug backup "${BASE}/fake-data" && debug "done"
-
-# remove file
-rm -f "${BASE}/fake-data/0/0/9/37"
-
-# resume backup
-fg
-
-cleanup
diff --git a/testsuite/test-backup-missing-file1.sh b/testsuite/test-backup-missing-file1.sh
new file mode 100755
index 000000000..87a2dc26c
--- /dev/null
+++ b/testsuite/test-backup-missing-file1.sh
@@ -0,0 +1,16 @@
+set -em
+
+# setup restic
+prepare
+run restic init
+
+# start backup, break between readdir and lstat
+DEBUG_BREAK=pipe.walk1 DEBUG_BREAK_PIPE="fake-data/0/0/9" run restic.debug backup "${BASE}/fake-data" && debug "done"
+
+# remove file
+rm -f "${BASE}/fake-data/0/0/9/37"
+
+# resume backup
+fg
+
+cleanup
diff --git a/testsuite/test-backup-missing-file2.sh b/testsuite/test-backup-missing-file2.sh
new file mode 100755
index 000000000..c93d84b06
--- /dev/null
+++ b/testsuite/test-backup-missing-file2.sh
@@ -0,0 +1,16 @@
+set -em
+
+# setup restic
+prepare
+run restic init
+
+# start backup, break between walk and save
+DEBUG_BREAK=pipe.walk2 DEBUG_BREAK_PIPE="fake-data/0/0/9/37" run restic.debug backup "${BASE}/fake-data" && debug "done"
+
+# remove file
+rm -f "${BASE}/fake-data/0/0/9/37"
+
+# resume backup
+fg
+
+cleanup