bisync: deglobalize to fix concurrent runs via rc - fixes #8675

Before this change, bisync used some global variables, which could cause errors if running multiple concurrent bisync runs through the rc. (Running normally from the command line was not affected.) This change deglobalizes those variables so that multiple bisync runs can be safely run at once, from the same rclone instance.
2025-12-11 22:14:05 +01:00 · 2025-07-11 12:11:16 -04:00
parent cc20d93f47
commit 9073d17313
13 changed files with 255 additions and 235 deletions
--- a/cmd/bisync/bisync_test.go
+++ b/cmd/bisync/bisync_test.go
@@ -176,6 +176,7 @@ var (
 	// Flag -refresh-times helps with Dropbox tests failing with message
 	// "src and dst identical but can't set mod time without deleting and re-uploading"
 	argRefreshTimes = flag.Bool("refresh-times", false, "Force refreshing the target modtime, useful for Dropbox (default: false)")
+	ignoreLogs      = flag.Bool("ignore-logs", false, "skip comparing log lines but still compare listings")
 )

 // bisyncTest keeps all test data in a single place
@@ -264,6 +265,25 @@ func TestBisyncRemoteRemote(t *testing.T) {
 	testBisync(t, remote, remote)
 }

+// make sure rc can cope with running concurrent jobs
+func TestBisyncConcurrent(t *testing.T) {
+	oldArgTestCase := argTestCase
+	*argTestCase = "basic"
+	*ignoreLogs = true // not useful to compare logs here because both runs will be logging at once
+	t.Cleanup(func() {
+		argTestCase = oldArgTestCase
+		*ignoreLogs = false
+	})
+
+	t.Run("test1", testParallel)
+	t.Run("test2", testParallel)
+}
+
+func testParallel(t *testing.T) {
+	t.Parallel()
+	TestBisyncRemoteRemote(t)
+}
+
 // TestBisync is a test engine for bisync test cases.
 func testBisync(t *testing.T, path1, path2 string) {
 	ctx := context.Background()
@@ -1441,6 +1461,9 @@ func (b *bisyncTest) compareResults() int {
 		resultText := b.mangleResult(b.workDir, file, false)

 		if fileType(file) == "log" {
+			if *ignoreLogs {
+				continue
+			}
 			// save mangled logs so difference is easier on eyes
 			goldenFile := filepath.Join(b.logDir, "mangled.golden.log")
 			resultFile := filepath.Join(b.logDir, "mangled.result.log")
--- a/cmd/bisync/checkfn.go
+++ b/cmd/bisync/checkfn.go
@@ -16,15 +16,17 @@ import (
 	"github.com/rclone/rclone/fs/operations"
 )

-var hashType hash.Type
-var fsrc, fdst fs.Fs
-var fcrypt *crypt.Fs
+type bisyncCheck = struct {
+	hashType   hash.Type
+	fsrc, fdst fs.Fs
+	fcrypt     *crypt.Fs
+}

 // WhichCheck determines which CheckFn we should use based on the Fs types
 // It is more robust and accurate than Check because
 // it will fallback to CryptCheck or DownloadCheck instead of --size-only!
 // it returns the *operations.CheckOpt with the CheckFn set.
-func WhichCheck(ctx context.Context, opt *operations.CheckOpt) *operations.CheckOpt {
+func (b *bisyncRun) WhichCheck(ctx context.Context, opt *operations.CheckOpt) *operations.CheckOpt {
 	ci := fs.GetConfig(ctx)
 	common := opt.Fsrc.Hashes().Overlap(opt.Fdst.Hashes())

@@ -40,32 +42,32 @@ func WhichCheck(ctx context.Context, opt *operations.CheckOpt) *operations.Check

 	if (srcIsCrypt && dstIsCrypt) || (!srcIsCrypt && dstIsCrypt) {
 		// if both are crypt or only dst is crypt
-		hashType = FdstCrypt.UnWrap().Hashes().GetOne()
-		if hashType != hash.None {
+		b.check.hashType = FdstCrypt.UnWrap().Hashes().GetOne()
+		if b.check.hashType != hash.None {
 			// use cryptcheck
-			fsrc = opt.Fsrc
-			fdst = opt.Fdst
-			fcrypt = FdstCrypt
-			fs.Infof(fdst, "Crypt detected! Using cryptcheck instead of check. (Use --size-only or --ignore-checksum to disable)")
-			opt.Check = CryptCheckFn
+			b.check.fsrc = opt.Fsrc
+			b.check.fdst = opt.Fdst
+			b.check.fcrypt = FdstCrypt
+			fs.Infof(b.check.fdst, "Crypt detected! Using cryptcheck instead of check. (Use --size-only or --ignore-checksum to disable)")
+			opt.Check = b.CryptCheckFn
 			return opt
 		}
 	} else if srcIsCrypt && !dstIsCrypt {
 		// if only src is crypt
-		hashType = FsrcCrypt.UnWrap().Hashes().GetOne()
-		if hashType != hash.None {
+		b.check.hashType = FsrcCrypt.UnWrap().Hashes().GetOne()
+		if b.check.hashType != hash.None {
 			// use reverse cryptcheck
-			fsrc = opt.Fdst
-			fdst = opt.Fsrc
-			fcrypt = FsrcCrypt
-			fs.Infof(fdst, "Crypt detected! Using cryptcheck instead of check. (Use --size-only or --ignore-checksum to disable)")
-			opt.Check = ReverseCryptCheckFn
+			b.check.fsrc = opt.Fdst
+			b.check.fdst = opt.Fsrc
+			b.check.fcrypt = FsrcCrypt
+			fs.Infof(b.check.fdst, "Crypt detected! Using cryptcheck instead of check. (Use --size-only or --ignore-checksum to disable)")
+			opt.Check = b.ReverseCryptCheckFn
 			return opt
 		}
 	}

 	// if we've gotten this far, neither check or cryptcheck will work, so use --download
-	fs.Infof(fdst, "Can't compare hashes, so using check --download for safety. (Use --size-only or --ignore-checksum to disable)")
+	fs.Infof(b.check.fdst, "Can't compare hashes, so using check --download for safety. (Use --size-only or --ignore-checksum to disable)")
 	opt.Check = DownloadCheckFn
 	return opt
 }
@@ -88,17 +90,17 @@ func CheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool,
 }

 // CryptCheckFn is a slightly modified version of CryptCheck
-func CryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
+func (b *bisyncRun) CryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
 	cryptDst := dst.(*crypt.Object)
 	underlyingDst := cryptDst.UnWrap()
-	underlyingHash, err := underlyingDst.Hash(ctx, hashType)
+	underlyingHash, err := underlyingDst.Hash(ctx, b.check.hashType)
 	if err != nil {
 		return true, false, fmt.Errorf("error reading hash from underlying %v: %w", underlyingDst, err)
 	}
 	if underlyingHash == "" {
 		return false, true, nil
 	}
-	cryptHash, err := fcrypt.ComputeHash(ctx, cryptDst, src, hashType)
+	cryptHash, err := b.check.fcrypt.ComputeHash(ctx, cryptDst, src, b.check.hashType)
 	if err != nil {
 		return true, false, fmt.Errorf("error computing hash: %w", err)
 	}
@@ -106,10 +108,10 @@ func CryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash
 		return false, true, nil
 	}
 	if cryptHash != underlyingHash {
-		err = fmt.Errorf("hashes differ (%s:%s) %q vs (%s:%s) %q", fdst.Name(), fdst.Root(), cryptHash, fsrc.Name(), fsrc.Root(), underlyingHash)
+		err = fmt.Errorf("hashes differ (%s:%s) %q vs (%s:%s) %q", b.check.fdst.Name(), b.check.fdst.Root(), cryptHash, b.check.fsrc.Name(), b.check.fsrc.Root(), underlyingHash)
 		fs.Debugf(src, "%s", err.Error())
 		// using same error msg as CheckFn so integration tests match
-		err = fmt.Errorf("%v differ", hashType)
+		err = fmt.Errorf("%v differ", b.check.hashType)
 		fs.Errorf(src, "%s", err.Error())
 		return true, false, nil
 	}
@@ -118,8 +120,8 @@ func CryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash

 // ReverseCryptCheckFn is like CryptCheckFn except src and dst are switched
 // result: src is crypt, dst is non-crypt
-func ReverseCryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
-	return CryptCheckFn(ctx, src, dst)
+func (b *bisyncRun) ReverseCryptCheckFn(ctx context.Context, dst, src fs.Object) (differ bool, noHash bool, err error) {
+	return b.CryptCheckFn(ctx, src, dst)
 }

 // DownloadCheckFn is a slightly modified version of Check with --download
@@ -137,7 +139,7 @@ func (b *bisyncRun) checkconflicts(ctxCheck context.Context, filterCheck *filter
 	if filterCheck.HaveFilesFrom() {
 		fs.Debugf(nil, "There are potential conflicts to check.")

-		opt, close, checkopterr := check.GetCheckOpt(b.fs1, b.fs2)
+		opt, close, checkopterr := check.GetCheckOpt(fs1, fs2)
 		if checkopterr != nil {
 			b.critical = true
 			b.retryable = true
@@ -148,7 +150,7 @@ func (b *bisyncRun) checkconflicts(ctxCheck context.Context, filterCheck *filter

 		opt.Match = new(bytes.Buffer)

-		opt = WhichCheck(ctxCheck, opt)
+		opt = b.WhichCheck(ctxCheck, opt)

 		fs.Infof(nil, "Checking potential conflicts...")
 		check := operations.CheckFn(ctxCheck, opt)
@@ -173,14 +175,14 @@ func (b *bisyncRun) checkconflicts(ctxCheck context.Context, filterCheck *filter

 // WhichEqual is similar to WhichCheck, but checks a single object.
 // Returns true if the objects are equal, false if they differ or if we don't know
-func WhichEqual(ctx context.Context, src, dst fs.Object, Fsrc, Fdst fs.Fs) bool {
+func (b *bisyncRun) WhichEqual(ctx context.Context, src, dst fs.Object, Fsrc, Fdst fs.Fs) bool {
 	opt, close, checkopterr := check.GetCheckOpt(Fsrc, Fdst)
 	if checkopterr != nil {
 		fs.Debugf(nil, "GetCheckOpt error: %v", checkopterr)
 	}
 	defer close()

-	opt = WhichCheck(ctx, opt)
+	opt = b.WhichCheck(ctx, opt)
 	differ, noHash, err := opt.Check(ctx, dst, src)
 	if err != nil {
 		fs.Errorf(src, "failed to check: %v", err)
@@ -217,7 +219,7 @@ func (b *bisyncRun) EqualFn(ctx context.Context) context.Context {
 		equal, skipHash = timeSizeEqualFn()
 		if equal && !skipHash {
 			whichHashType := func(f fs.Info) hash.Type {
-				ht := getHashType(f.Name())
+				ht := b.getHashType(f.Name())
 				if ht == hash.None && b.opt.Compare.SlowHashSyncOnly && !b.opt.Resync {
 					ht = f.Hashes().GetOne()
 				}
@@ -225,9 +227,9 @@ func (b *bisyncRun) EqualFn(ctx context.Context) context.Context {
 			}
 			srcHash, _ := src.Hash(ctx, whichHashType(src.Fs()))
 			dstHash, _ := dst.Hash(ctx, whichHashType(dst.Fs()))
-			srcHash, _ = tryDownloadHash(ctx, src, srcHash)
-			dstHash, _ = tryDownloadHash(ctx, dst, dstHash)
-			equal = !hashDiffers(srcHash, dstHash, whichHashType(src.Fs()), whichHashType(dst.Fs()), src.Size(), dst.Size())
+			srcHash, _ = b.tryDownloadHash(ctx, src, srcHash)
+			dstHash, _ = b.tryDownloadHash(ctx, dst, dstHash)
+			equal = !b.hashDiffers(srcHash, dstHash, whichHashType(src.Fs()), whichHashType(dst.Fs()), src.Size(), dst.Size())
 		}
 		if equal {
 			logger(ctx, operations.Match, src, dst, nil)
--- a/cmd/bisync/cmd.go
+++ b/cmd/bisync/cmd.go
@@ -115,6 +115,7 @@ func (x *CheckSyncMode) Type() string {
 }

 // Opt keeps command line options
+// internal functions should use b.opt instead
 var Opt Options

 func init() {
--- a/cmd/bisync/compare.go
+++ b/cmd/bisync/compare.go
@@ -28,7 +28,7 @@ type CompareOpt = struct {
 	DownloadHash     bool
 }

-func (b *bisyncRun) setCompareDefaults(ctx context.Context) error {
+func (b *bisyncRun) setCompareDefaults(ctx context.Context) (err error) {
 	ci := fs.GetConfig(ctx)

 	// defaults
@@ -120,25 +120,25 @@ func sizeDiffers(a, b int64) bool {

 // returns true if the hashes are definitely different.
 // returns false if equal, or if either is unknown.
-func hashDiffers(a, b string, ht1, ht2 hash.Type, size1, size2 int64) bool {
-	if a == "" || b == "" {
+func (b *bisyncRun) hashDiffers(stringA, stringB string, ht1, ht2 hash.Type, size1, size2 int64) bool {
+	if stringA == "" || stringB == "" {
 		if ht1 != hash.None && ht2 != hash.None && !(size1 <= 0 || size2 <= 0) {
-			fs.Logf(nil, Color(terminal.YellowFg, "WARNING: hash unexpectedly blank despite Fs support (%s, %s) (you may need to --resync!)"), a, b)
+			fs.Logf(nil, Color(terminal.YellowFg, "WARNING: hash unexpectedly blank despite Fs support (%s, %s) (you may need to --resync!)"), stringA, stringB)
 		}
 		return false
 	}
 	if ht1 != ht2 {
-		if !(downloadHash && ((ht1 == hash.MD5 && ht2 == hash.None) || (ht1 == hash.None && ht2 == hash.MD5))) {
+		if !(b.downloadHashOpt.downloadHash && ((ht1 == hash.MD5 && ht2 == hash.None) || (ht1 == hash.None && ht2 == hash.MD5))) {
 			fs.Infof(nil, Color(terminal.YellowFg, "WARNING: Can't compare hashes of different types (%s, %s)"), ht1.String(), ht2.String())
 			return false
 		}
 	}
-	return a != b
+	return stringA != stringB
 }

 // chooses hash type, giving priority to types both sides have in common
 func (b *bisyncRun) setHashType(ci *fs.ConfigInfo) {
-	downloadHash = b.opt.Compare.DownloadHash
+	b.downloadHashOpt.downloadHash = b.opt.Compare.DownloadHash
 	if b.opt.Compare.NoSlowHash && b.opt.Compare.SlowHashDetected {
 		fs.Infof(nil, "Not checking for common hash as at least one slow hash detected.")
 	} else {
@@ -268,13 +268,15 @@ func (b *bisyncRun) setFromCompareFlag(ctx context.Context) error {
 	return nil
 }

-// downloadHash is true if we should attempt to compute hash by downloading when otherwise unavailable
-var downloadHash bool
-var downloadHashWarn mutex.Once
-var firstDownloadHash mutex.Once
+// b.downloadHashOpt.downloadHash is true if we should attempt to compute hash by downloading when otherwise unavailable
+type downloadHashOpt struct {
+	downloadHash      bool
+	downloadHashWarn  mutex.Once
+	firstDownloadHash mutex.Once
+}

-func tryDownloadHash(ctx context.Context, o fs.DirEntry, hashVal string) (string, error) {
-	if hashVal != "" || !downloadHash {
+func (b *bisyncRun) tryDownloadHash(ctx context.Context, o fs.DirEntry, hashVal string) (string, error) {
+	if hashVal != "" || !b.downloadHashOpt.downloadHash {
 		return hashVal, nil
 	}
 	obj, ok := o.(fs.Object)
@@ -283,14 +285,14 @@ func tryDownloadHash(ctx context.Context, o fs.DirEntry, hashVal string) (string
 		return hashVal, fs.ErrorObjectNotFound
 	}
 	if o.Size() < 0 {
-		downloadHashWarn.Do(func() {
+		b.downloadHashOpt.downloadHashWarn.Do(func() {
 			fs.Log(o, Color(terminal.YellowFg, "Skipping hash download as checksum not reliable with files of unknown length."))
 		})
 		fs.Debugf(o, "Skipping hash download as checksum not reliable with files of unknown length.")
 		return hashVal, hash.ErrUnsupported
 	}

-	firstDownloadHash.Do(func() {
+	b.downloadHashOpt.firstDownloadHash.Do(func() {
 		fs.Infoc(obj.Fs().Name(), Color(terminal.Dim, "Downloading hashes..."))
 	})
 	tr := accounting.Stats(ctx).NewCheckingTransfer(o, "computing hash with --download-hash")
--- a/cmd/bisync/deltas.go
+++ b/cmd/bisync/deltas.go
@@ -219,7 +219,7 @@ func (b *bisyncRun) findDeltas(fctx context.Context, f fs.Fs, oldListing string,
 				}
 			}
 			if b.opt.Compare.Checksum {
-				if hashDiffers(old.getHash(file), now.getHash(file), old.hash, now.hash, old.getSize(file), now.getSize(file)) {
+				if b.hashDiffers(old.getHash(file), now.getHash(file), old.hash, now.hash, old.getSize(file), now.getSize(file)) {
 					fs.Debugf(file, "(old: %v current: %v)", old.getHash(file), now.getHash(file))
 					whatchanged = append(whatchanged, Color(terminal.MagentaFg, "hash"))
 					d |= deltaHash
@@ -346,7 +346,7 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (result
 			if d2.is(deltaOther) {
 				// if size or hash differ, skip this, as we already know they're not equal
 				if (b.opt.Compare.Size && sizeDiffers(ds1.size[file], ds2.size[file2])) ||
-					(b.opt.Compare.Checksum && hashDiffers(ds1.hash[file], ds2.hash[file2], b.opt.Compare.HashType1, b.opt.Compare.HashType2, ds1.size[file], ds2.size[file2])) {
+					(b.opt.Compare.Checksum && b.hashDiffers(ds1.hash[file], ds2.hash[file2], b.opt.Compare.HashType1, b.opt.Compare.HashType2, ds1.size[file], ds2.size[file2])) {
 					fs.Debugf(file, "skipping equality check as size/hash definitely differ")
 				} else {
 					checkit := func(filename string) {
@@ -393,10 +393,10 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (result
 				// if files are identical, leave them alone instead of renaming
 				if (dirs1.has(file) || dirs1.has(alias)) && (dirs2.has(file) || dirs2.has(alias)) {
 					fs.Infof(nil, "This is a directory, not a file. Skipping equality check and will not rename: %s", file)
-					ls1.getPut(file, skippedDirs1)
-					ls2.getPut(file, skippedDirs2)
+					b.march.ls1.getPut(file, skippedDirs1)
+					b.march.ls2.getPut(file, skippedDirs2)
 					b.debugFn(file, func() {
-						b.debug(file, fmt.Sprintf("deltas dir: %s, ls1 has name?: %v, ls2 has name?: %v", file, ls1.has(b.DebugName), ls2.has(b.DebugName)))
+						b.debug(file, fmt.Sprintf("deltas dir: %s, ls1 has name?: %v, b.march.ls2 has name?: %v", file, b.march.ls1.has(b.DebugName), b.march.ls2.has(b.DebugName)))
 					})
 				} else {
 					equal := matches.Has(file)
@@ -409,16 +409,16 @@ func (b *bisyncRun) applyDeltas(ctx context.Context, ds1, ds2 *deltaSet) (result
 							// the Path1 version is deemed "correct" in this scenario
 							fs.Infof(alias, "Files are equal but will copy anyway to fix case to %s", file)
 							copy1to2.Add(file)
-						} else if b.opt.Compare.Modtime && timeDiffers(ctx, ls1.getTime(ls1.getTryAlias(file, alias)), ls2.getTime(ls2.getTryAlias(file, alias)), b.fs1, b.fs2) {
+						} else if b.opt.Compare.Modtime && timeDiffers(ctx, b.march.ls1.getTime(b.march.ls1.getTryAlias(file, alias)), b.march.ls2.getTime(b.march.ls2.getTryAlias(file, alias)), b.fs1, b.fs2) {
 							fs.Infof(file, "Files are equal but will copy anyway to update modtime (will not rename)")
-							if ls1.getTime(ls1.getTryAlias(file, alias)).Before(ls2.getTime(ls2.getTryAlias(file, alias))) {
+							if b.march.ls1.getTime(b.march.ls1.getTryAlias(file, alias)).Before(b.march.ls2.getTime(b.march.ls2.getTryAlias(file, alias))) {
 								// Path2 is newer
 								b.indent("Path2", p1, "Queue copy to Path1")
-								copy2to1.Add(ls2.getTryAlias(file, alias))
+								copy2to1.Add(b.march.ls2.getTryAlias(file, alias))
 							} else {
 								// Path1 is newer
 								b.indent("Path1", p2, "Queue copy to Path2")
-								copy1to2.Add(ls1.getTryAlias(file, alias))
+								copy1to2.Add(b.march.ls1.getTryAlias(file, alias))
 							}
 						} else {
 							fs.Infof(nil, "Files are equal! Skipping: %s", file)
@@ -590,10 +590,10 @@ func (b *bisyncRun) updateAliases(ctx context.Context, ds1, ds2 *deltaSet) {
 	fullMap1 := map[string]string{} // [transformedname]originalname
 	fullMap2 := map[string]string{} // [transformedname]originalname

-	for _, name := range ls1.list {
+	for _, name := range b.march.ls1.list {
 		fullMap1[transform(name)] = name
 	}
-	for _, name := range ls2.list {
+	for _, name := range b.march.ls2.list {
 		fullMap2[transform(name)] = name
 	}

--- a/cmd/bisync/listing.go
+++ b/cmd/bisync/listing.go
@@ -202,8 +202,8 @@ func (b *bisyncRun) fileInfoEqual(file1, file2 string, ls1, ls2 *fileList) bool
 			equal = false
 		}
 	}
-	if b.opt.Compare.Checksum && !ignoreListingChecksum {
-		if hashDiffers(ls1.getHash(file1), ls2.getHash(file2), b.opt.Compare.HashType1, b.opt.Compare.HashType2, ls1.getSize(file1), ls2.getSize(file2)) {
+	if b.opt.Compare.Checksum && !b.queueOpt.ignoreListingChecksum {
+		if b.hashDiffers(ls1.getHash(file1), ls2.getHash(file2), b.opt.Compare.HashType1, b.opt.Compare.HashType2, ls1.getSize(file1), ls2.getSize(file2)) {
 			b.indent("ERROR", file1, fmt.Sprintf("Checksum not equal in listing. Path1: %v, Path2: %v", ls1.getHash(file1), ls2.getHash(file2)))
 			equal = false
 		}
@@ -745,7 +745,7 @@ func (b *bisyncRun) recheck(ctxRecheck context.Context, src, dst fs.Fs, srcList,
 			if hashType != hash.None {
 				hashVal, _ = obj.Hash(ctxRecheck, hashType)
 			}
-			hashVal, _ = tryDownloadHash(ctxRecheck, obj, hashVal)
+			hashVal, _ = b.tryDownloadHash(ctxRecheck, obj, hashVal)
 		}
 		var modtime time.Time
 		if b.opt.Compare.Modtime {
@@ -759,7 +759,7 @@ func (b *bisyncRun) recheck(ctxRecheck context.Context, src, dst fs.Fs, srcList,
 		for _, dstObj := range dstObjs {
 			if srcObj.Remote() == dstObj.Remote() || srcObj.Remote() == b.aliases.Alias(dstObj.Remote()) {
 				// note: unlike Equal(), WhichEqual() does not update the modtime in dest if sums match but modtimes don't.
-				if b.opt.DryRun || WhichEqual(ctxRecheck, srcObj, dstObj, src, dst) {
+				if b.opt.DryRun || b.WhichEqual(ctxRecheck, srcObj, dstObj, src, dst) {
 					putObj(srcObj, srcList)
 					putObj(dstObj, dstList)
 					resolved = append(resolved, srcObj.Remote())
@@ -773,7 +773,7 @@ func (b *bisyncRun) recheck(ctxRecheck context.Context, src, dst fs.Fs, srcList,
 		// skip and error during --resync, as rollback is not possible
 		if !slices.Contains(resolved, srcObj.Remote()) && !b.opt.DryRun {
 			if b.opt.Resync {
-				err = errors.New("no dstObj match or files not equal")
+				err := errors.New("no dstObj match or files not equal")
 				b.handleErr(srcObj, "Unable to rollback during --resync", err, true, false)
 			} else {
 				toRollback = append(toRollback, srcObj.Remote())
--- a/cmd/bisync/lockfile.go
+++ b/cmd/bisync/lockfile.go
@@ -16,16 +16,17 @@ import (

 const basicallyforever = fs.Duration(200 * 365 * 24 * time.Hour)

-var stopRenewal func()
-
-var data = struct {
+type lockFileOpt struct {
+	stopRenewal func()
+	data        struct {
 		Session     string
 		PID         string
 		TimeRenewed time.Time
 		TimeExpires time.Time
-}{}
+	}
+}

-func (b *bisyncRun) setLockFile() error {
+func (b *bisyncRun) setLockFile() (err error) {
 	b.lockFile = ""
 	b.setLockFileExpiration()
 	if !b.opt.DryRun {
@@ -45,24 +46,23 @@ func (b *bisyncRun) setLockFile() error {
 		}
 		fs.Debugf(nil, "Lock file created: %s", b.lockFile)
 		b.renewLockFile()
-		stopRenewal = b.startLockRenewal()
+		b.lockFileOpt.stopRenewal = b.startLockRenewal()
 	}
 	return nil
 }

-func (b *bisyncRun) removeLockFile() {
+func (b *bisyncRun) removeLockFile() (err error) {
 	if b.lockFile != "" {
-		stopRenewal()
-		errUnlock := os.Remove(b.lockFile)
-		if errUnlock == nil {
+		b.lockFileOpt.stopRenewal()
+		err = os.Remove(b.lockFile)
+		if err == nil {
 			fs.Debugf(nil, "Lock file removed: %s", b.lockFile)
-		} else if err == nil {
-			err = errUnlock
 		} else {
-			fs.Errorf(nil, "cannot remove lockfile %s: %v", b.lockFile, errUnlock)
+			fs.Errorf(nil, "cannot remove lockfile %s: %v", b.lockFile, err)
 		}
 		b.lockFile = "" // block removing it again
 	}
+	return err
 }

 func (b *bisyncRun) setLockFileExpiration() {
@@ -77,18 +77,18 @@ func (b *bisyncRun) setLockFileExpiration() {
 func (b *bisyncRun) renewLockFile() {
 	if b.lockFile != "" && bilib.FileExists(b.lockFile) {

-		data.Session = b.basePath
-		data.PID = strconv.Itoa(os.Getpid())
-		data.TimeRenewed = time.Now()
-		data.TimeExpires = time.Now().Add(time.Duration(b.opt.MaxLock))
+		b.lockFileOpt.data.Session = b.basePath
+		b.lockFileOpt.data.PID = strconv.Itoa(os.Getpid())
+		b.lockFileOpt.data.TimeRenewed = time.Now()
+		b.lockFileOpt.data.TimeExpires = time.Now().Add(time.Duration(b.opt.MaxLock))

 		// save data file
 		df, err := os.Create(b.lockFile)
 		b.handleErr(b.lockFile, "error renewing lock file", err, true, true)
-		b.handleErr(b.lockFile, "error encoding JSON to lock file", json.NewEncoder(df).Encode(data), true, true)
+		b.handleErr(b.lockFile, "error encoding JSON to lock file", json.NewEncoder(df).Encode(b.lockFileOpt.data), true, true)
 		b.handleErr(b.lockFile, "error closing lock file", df.Close(), true, true)
 		if b.opt.MaxLock < basicallyforever {
-			fs.Infof(nil, Color(terminal.HiBlueFg, "lock file renewed for %v. New expiration: %v"), b.opt.MaxLock, data.TimeExpires)
+			fs.Infof(nil, Color(terminal.HiBlueFg, "lock file renewed for %v. New expiration: %v"), b.opt.MaxLock, b.lockFileOpt.data.TimeExpires)
 		}
 	}
 }
@@ -99,7 +99,7 @@ func (b *bisyncRun) lockFileIsExpired() bool {
 		b.handleErr(b.lockFile, "error reading lock file", err, true, true)
 		dec := json.NewDecoder(rdf)
 		for {
-			if err := dec.Decode(&data); err != nil {
+			if err := dec.Decode(&b.lockFileOpt.data); err != nil {
 				if err != io.EOF {
 					fs.Errorf(b.lockFile, "err: %v", err)
 				}
@@ -107,14 +107,14 @@ func (b *bisyncRun) lockFileIsExpired() bool {
 			}
 		}
 		b.handleErr(b.lockFile, "error closing file", rdf.Close(), true, true)
-		if !data.TimeExpires.IsZero() && data.TimeExpires.Before(time.Now()) {
-			fs.Infof(b.lockFile, Color(terminal.GreenFg, "Lock file found, but it expired at %v. Will delete it and proceed."), data.TimeExpires)
+		if !b.lockFileOpt.data.TimeExpires.IsZero() && b.lockFileOpt.data.TimeExpires.Before(time.Now()) {
+			fs.Infof(b.lockFile, Color(terminal.GreenFg, "Lock file found, but it expired at %v. Will delete it and proceed."), b.lockFileOpt.data.TimeExpires)
 			markFailed(b.listing1) // listing is untrusted so force revert to prior (if --recover) or create new ones (if --resync)
 			markFailed(b.listing2)
 			return true
 		}
-		fs.Infof(b.lockFile, Color(terminal.RedFg, "Valid lock file found. Expires at %v. (%v from now)"), data.TimeExpires, time.Since(data.TimeExpires).Abs().Round(time.Second))
-		prettyprint(data, "Lockfile info", fs.LogLevelInfo)
+		fs.Infof(b.lockFile, Color(terminal.RedFg, "Valid lock file found. Expires at %v. (%v from now)"), b.lockFileOpt.data.TimeExpires, time.Since(b.lockFileOpt.data.TimeExpires).Abs().Round(time.Second))
+		prettyprint(b.lockFileOpt.data, "Lockfile info", fs.LogLevelInfo)
 	}
 	return false
 }
--- a/cmd/bisync/march.go
+++ b/cmd/bisync/march.go
@@ -12,18 +12,20 @@ import (
 	"github.com/rclone/rclone/fs/march"
 )

-var ls1 = newFileList()
-var ls2 = newFileList()
-var err error
-var firstErr error
-var marchAliasLock sync.Mutex
-var marchLsLock sync.Mutex
-var marchErrLock sync.Mutex
-var marchCtx context.Context
+type bisyncMarch struct {
+	ls1            *fileList
+	ls2            *fileList
+	err            error
+	firstErr       error
+	marchAliasLock sync.Mutex
+	marchLsLock    sync.Mutex
+	marchErrLock   sync.Mutex
+	marchCtx       context.Context
+}

 func (b *bisyncRun) makeMarchListing(ctx context.Context) (*fileList, *fileList, error) {
 	ci := fs.GetConfig(ctx)
-	marchCtx = ctx
+	b.march.marchCtx = ctx
 	b.setupListing()
 	fs.Debugf(b, "starting to march!")

@@ -39,31 +41,31 @@ func (b *bisyncRun) makeMarchListing(ctx context.Context) (*fileList, *fileList,
 		NoCheckDest:            false,
 		NoUnicodeNormalization: ci.NoUnicodeNormalization,
 	}
-	err = m.Run(ctx)
+	b.march.err = m.Run(ctx)

-	fs.Debugf(b, "march completed. err: %v", err)
-	if err == nil {
-		err = firstErr
+	fs.Debugf(b, "march completed. err: %v", b.march.err)
+	if b.march.err == nil {
+		b.march.err = b.march.firstErr
 	}
-	if err != nil {
-		b.handleErr("march", "error during march", err, true, true)
+	if b.march.err != nil {
+		b.handleErr("march", "error during march", b.march.err, true, true)
 		b.abort = true
-		return ls1, ls2, err
+		return b.march.ls1, b.march.ls2, b.march.err
 	}

 	// save files
-	if b.opt.Compare.DownloadHash && ls1.hash == hash.None {
-		ls1.hash = hash.MD5
+	if b.opt.Compare.DownloadHash && b.march.ls1.hash == hash.None {
+		b.march.ls1.hash = hash.MD5
 	}
-	if b.opt.Compare.DownloadHash && ls2.hash == hash.None {
-		ls2.hash = hash.MD5
+	if b.opt.Compare.DownloadHash && b.march.ls2.hash == hash.None {
+		b.march.ls2.hash = hash.MD5
 	}
-	err = ls1.save(ctx, b.newListing1)
-	b.handleErr(ls1, "error saving ls1 from march", err, true, true)
-	err = ls2.save(ctx, b.newListing2)
-	b.handleErr(ls2, "error saving ls2 from march", err, true, true)
+	b.march.err = b.march.ls1.save(ctx, b.newListing1)
+	b.handleErr(b.march.ls1, "error saving b.march.ls1 from march", b.march.err, true, true)
+	b.march.err = b.march.ls2.save(ctx, b.newListing2)
+	b.handleErr(b.march.ls2, "error saving b.march.ls2 from march", b.march.err, true, true)

-	return ls1, ls2, err
+	return b.march.ls1, b.march.ls2, b.march.err
 }

 // SrcOnly have an object which is on path1 only
@@ -83,9 +85,9 @@ func (b *bisyncRun) DstOnly(o fs.DirEntry) (recurse bool) {
 // Match is called when object exists on both path1 and path2 (whether equal or not)
 func (b *bisyncRun) Match(ctx context.Context, o2, o1 fs.DirEntry) (recurse bool) {
 	fs.Debugf(o1, "both path1 and path2")
-	marchAliasLock.Lock()
+	b.march.marchAliasLock.Lock()
 	b.aliases.Add(o1.Remote(), o2.Remote())
-	marchAliasLock.Unlock()
+	b.march.marchAliasLock.Unlock()
 	b.parse(o1, true)
 	b.parse(o2, false)
 	return isDir(o1)
@@ -119,76 +121,76 @@ func (b *bisyncRun) parse(e fs.DirEntry, isPath1 bool) {
 }

 func (b *bisyncRun) setupListing() {
-	ls1 = newFileList()
-	ls2 = newFileList()
+	b.march.ls1 = newFileList()
+	b.march.ls2 = newFileList()

 	// note that --ignore-listing-checksum is different from --ignore-checksum
 	// and we already checked it when we set b.opt.Compare.HashType1 and 2
-	ls1.hash = b.opt.Compare.HashType1
-	ls2.hash = b.opt.Compare.HashType2
+	b.march.ls1.hash = b.opt.Compare.HashType1
+	b.march.ls2.hash = b.opt.Compare.HashType2
 }

 func (b *bisyncRun) ForObject(o fs.Object, isPath1 bool) {
-	tr := accounting.Stats(marchCtx).NewCheckingTransfer(o, "listing file - "+whichPath(isPath1))
+	tr := accounting.Stats(b.march.marchCtx).NewCheckingTransfer(o, "listing file - "+whichPath(isPath1))
 	defer func() {
-		tr.Done(marchCtx, nil)
+		tr.Done(b.march.marchCtx, nil)
 	}()
 	var (
 		hashVal string
 		hashErr error
 	)
-	ls := whichLs(isPath1)
+	ls := b.whichLs(isPath1)
 	hashType := ls.hash
 	if hashType != hash.None {
-		hashVal, hashErr = o.Hash(marchCtx, hashType)
-		marchErrLock.Lock()
-		if firstErr == nil {
-			firstErr = hashErr
+		hashVal, hashErr = o.Hash(b.march.marchCtx, hashType)
+		b.march.marchErrLock.Lock()
+		if b.march.firstErr == nil {
+			b.march.firstErr = hashErr
 		}
-		marchErrLock.Unlock()
+		b.march.marchErrLock.Unlock()
 	}
-	hashVal, hashErr = tryDownloadHash(marchCtx, o, hashVal)
-	marchErrLock.Lock()
-	if firstErr == nil {
-		firstErr = hashErr
+	hashVal, hashErr = b.tryDownloadHash(b.march.marchCtx, o, hashVal)
+	b.march.marchErrLock.Lock()
+	if b.march.firstErr == nil {
+		b.march.firstErr = hashErr
 	}
-	if firstErr != nil {
-		b.handleErr(hashType, "error hashing during march", firstErr, false, true)
+	if b.march.firstErr != nil {
+		b.handleErr(hashType, "error hashing during march", b.march.firstErr, false, true)
 	}
-	marchErrLock.Unlock()
+	b.march.marchErrLock.Unlock()

 	var modtime time.Time
 	if b.opt.Compare.Modtime {
-		modtime = o.ModTime(marchCtx).In(TZ)
+		modtime = o.ModTime(b.march.marchCtx).In(TZ)
 	}
 	id := ""     // TODO: ID(o)
 	flags := "-" // "-" for a file and "d" for a directory
-	marchLsLock.Lock()
+	b.march.marchLsLock.Lock()
 	ls.put(o.Remote(), o.Size(), modtime, hashVal, id, flags)
-	marchLsLock.Unlock()
+	b.march.marchLsLock.Unlock()
 }

 func (b *bisyncRun) ForDir(o fs.Directory, isPath1 bool) {
-	tr := accounting.Stats(marchCtx).NewCheckingTransfer(o, "listing dir - "+whichPath(isPath1))
+	tr := accounting.Stats(b.march.marchCtx).NewCheckingTransfer(o, "listing dir - "+whichPath(isPath1))
 	defer func() {
-		tr.Done(marchCtx, nil)
+		tr.Done(b.march.marchCtx, nil)
 	}()
-	ls := whichLs(isPath1)
+	ls := b.whichLs(isPath1)
 	var modtime time.Time
 	if b.opt.Compare.Modtime {
-		modtime = o.ModTime(marchCtx).In(TZ)
+		modtime = o.ModTime(b.march.marchCtx).In(TZ)
 	}
 	id := ""     // TODO
 	flags := "d" // "-" for a file and "d" for a directory
-	marchLsLock.Lock()
+	b.march.marchLsLock.Lock()
 	ls.put(o.Remote(), -1, modtime, "", id, flags)
-	marchLsLock.Unlock()
+	b.march.marchLsLock.Unlock()
 }

-func whichLs(isPath1 bool) *fileList {
-	ls := ls1
+func (b *bisyncRun) whichLs(isPath1 bool) *fileList {
+	ls := b.march.ls1
 	if !isPath1 {
-		ls = ls2
+		ls = b.march.ls2
 	}
 	return ls
 }
@@ -206,7 +208,7 @@ func (b *bisyncRun) findCheckFiles(ctx context.Context) (*fileList, *fileList, e
 	b.handleErr(b.opt.CheckFilename, "error adding CheckFilename to filter", filterCheckFile.Add(true, b.opt.CheckFilename), true, true)
 	b.handleErr(b.opt.CheckFilename, "error adding ** exclusion to filter", filterCheckFile.Add(false, "**"), true, true)
 	ci := fs.GetConfig(ctxCheckFile)
-	marchCtx = ctxCheckFile
+	b.march.marchCtx = ctxCheckFile

 	b.setupListing()
 	fs.Debugf(b, "starting to march!")
@@ -223,18 +225,18 @@ func (b *bisyncRun) findCheckFiles(ctx context.Context) (*fileList, *fileList, e
 		NoCheckDest:            false,
 		NoUnicodeNormalization: ci.NoUnicodeNormalization,
 	}
-	err = m.Run(ctxCheckFile)
+	b.march.err = m.Run(ctxCheckFile)

-	fs.Debugf(b, "march completed. err: %v", err)
-	if err == nil {
-		err = firstErr
+	fs.Debugf(b, "march completed. err: %v", b.march.err)
+	if b.march.err == nil {
+		b.march.err = b.march.firstErr
 	}
-	if err != nil {
-		b.handleErr("march", "error during findCheckFiles", err, true, true)
+	if b.march.err != nil {
+		b.handleErr("march", "error during findCheckFiles", b.march.err, true, true)
 		b.abort = true
 	}

-	return ls1, ls2, err
+	return b.march.ls1, b.march.ls2, b.march.err
 }

 // ID returns the ID of the Object if known, or "" if not
--- a/cmd/bisync/operations.go
+++ b/cmd/bisync/operations.go
@@ -51,6 +51,11 @@ type bisyncRun struct {
 	lockFile           string
 	renames            renames
 	resyncIs1to2       bool
+	march              bisyncMarch
+	check              bisyncCheck
+	queueOpt           bisyncQueueOpt
+	downloadHashOpt    downloadHashOpt
+	lockFileOpt        lockFileOpt
 }

 type queues struct {
@@ -64,7 +69,6 @@ type queues struct {

 // Bisync handles lock file, performs bisync run and checks exit status
 func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
-	defer resetGlobals()
 	opt := *optArg // ensure that input is never changed
 	b := &bisyncRun{
 		fs1:       fs1,
@@ -124,6 +128,8 @@ func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
 		return err
 	}

+	b.queueOpt.logger = operations.NewLoggerOpt()
+
 	// Handle SIGINT
 	var finaliseOnce gosync.Once

@@ -161,7 +167,7 @@ func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
 					markFailed(b.listing1)
 					markFailed(b.listing2)
 				}
-				b.removeLockFile()
+				err = b.removeLockFile()
 			}
 		})
 	}
@@ -171,7 +177,10 @@ func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
 	// run bisync
 	err = b.runLocked(ctx)

-	b.removeLockFile()
+	removeLockErr := b.removeLockFile()
+	if err == nil {
+		err = removeLockErr
+	}

 	b.CleanupCompleted = true
 	if b.InGracefulShutdown {
@@ -297,7 +306,7 @@ func (b *bisyncRun) runLocked(octx context.Context) (err error) {
 	}

 	fs.Infof(nil, "Building Path1 and Path2 listings")
-	ls1, ls2, err = b.makeMarchListing(fctx)
+	b.march.ls1, b.march.ls2, err = b.makeMarchListing(fctx)
 	if err != nil || accounting.Stats(fctx).Errored() {
 		fs.Error(nil, Color(terminal.RedFg, "There were errors while building listings. Aborting as it is too dangerous to continue."))
 		b.critical = true
@@ -307,7 +316,7 @@ func (b *bisyncRun) runLocked(octx context.Context) (err error) {

 	// Check for Path1 deltas relative to the prior sync
 	fs.Infof(nil, "Path1 checking for diffs")
-	ds1, err := b.findDeltas(fctx, b.fs1, b.listing1, ls1, "Path1")
+	ds1, err := b.findDeltas(fctx, b.fs1, b.listing1, b.march.ls1, "Path1")
 	if err != nil {
 		return err
 	}
@@ -315,7 +324,7 @@ func (b *bisyncRun) runLocked(octx context.Context) (err error) {

 	// Check for Path2 deltas relative to the prior sync
 	fs.Infof(nil, "Path2 checking for diffs")
-	ds2, err := b.findDeltas(fctx, b.fs2, b.listing2, ls2, "Path2")
+	ds2, err := b.findDeltas(fctx, b.fs2, b.listing2, b.march.ls2, "Path2")
 	if err != nil {
 		return err
 	}
@@ -389,7 +398,7 @@ func (b *bisyncRun) runLocked(octx context.Context) (err error) {
 		newl1, _ := b.loadListing(b.newListing1)
 		newl2, _ := b.loadListing(b.newListing2)
 		b.debug(b.DebugName, fmt.Sprintf("pre-saveOldListings, ls1 has name?: %v, ls2 has name?: %v", l1.has(b.DebugName), l2.has(b.DebugName)))
-		b.debug(b.DebugName, fmt.Sprintf("pre-saveOldListings, newls1 has name?: %v, newls2 has name?: %v", newl1.has(b.DebugName), newl2.has(b.DebugName)))
+		b.debug(b.DebugName, fmt.Sprintf("pre-saveOldListings, newls1 has name?: %v, ls2 has name?: %v", newl1.has(b.DebugName), newl2.has(b.DebugName)))
 	}
 	b.saveOldListings()
 	// save new listings
@@ -553,7 +562,7 @@ func (b *bisyncRun) setBackupDir(ctx context.Context, destPath int) context.Cont
 	return ctx
 }

-func (b *bisyncRun) overlappingPathsCheck(fctx context.Context, fs1, fs2 fs.Fs) error {
+func (b *bisyncRun) overlappingPathsCheck(fctx context.Context, fs1, fs2 fs.Fs) (err error) {
 	if operations.OverlappingFilterCheck(fctx, fs2, fs1) {
 		err = errors.New(Color(terminal.RedFg, "Overlapping paths detected. Cannot bisync between paths that overlap, unless excluded by filters."))
 		return err
@@ -586,7 +595,7 @@ func (b *bisyncRun) overlappingPathsCheck(fctx context.Context, fs1, fs2 fs.Fs)
 	return nil
 }

-func (b *bisyncRun) checkSyntax() error {
+func (b *bisyncRun) checkSyntax() (err error) {
 	// check for odd number of quotes in path, usually indicating an escaping issue
 	path1 := bilib.FsPath(b.fs1)
 	path2 := bilib.FsPath(b.fs2)
@@ -634,25 +643,3 @@ func waitFor(msg string, totalWait time.Duration, fn func() bool) (ok bool) {
 	}
 	return false
 }
-
-// mainly to make sure tests don't interfere with each other when running more than one
-func resetGlobals() {
-	downloadHash = false
-	logger = operations.NewLoggerOpt()
-	ignoreListingChecksum = false
-	ignoreListingModtime = false
-	hashTypes = nil
-	queueCI = nil
-	hashType = 0
-	fsrc, fdst = nil, nil
-	fcrypt = nil
-	Opt = Options{}
-	once = gosync.Once{}
-	downloadHashWarn = gosync.Once{}
-	firstDownloadHash = gosync.Once{}
-	ls1 = newFileList()
-	ls2 = newFileList()
-	err = nil
-	firstErr = nil
-	marchCtx = nil
-}
--- a/cmd/bisync/queue.go
+++ b/cmd/bisync/queue.go
@@ -51,19 +51,19 @@ func (rs *ResultsSlice) has(name string) bool {
 	return false
 }

-var (
-	logger                = operations.NewLoggerOpt()
+type bisyncQueueOpt struct {
+	logger                operations.LoggerOpt
 	lock                  mutex.Mutex
 	once                  mutex.Once
 	ignoreListingChecksum bool
 	ignoreListingModtime  bool
 	hashTypes             map[string]hash.Type
 	queueCI               *fs.ConfigInfo
-)
+}

 // allows us to get the right hashtype during the LoggerFn without knowing whether it's Path1/Path2
-func getHashType(fname string) hash.Type {
-	ht, ok := hashTypes[fname]
+func (b *bisyncRun) getHashType(fname string) hash.Type {
+	ht, ok := b.queueOpt.hashTypes[fname]
 	if ok {
 		return ht
 	}
@@ -106,9 +106,9 @@ func altName(name string, src, dst fs.DirEntry) string {
 }

 // WriteResults is Bisync's LoggerFn
-func WriteResults(ctx context.Context, sigil operations.Sigil, src, dst fs.DirEntry, err error) {
-	lock.Lock()
-	defer lock.Unlock()
+func (b *bisyncRun) WriteResults(ctx context.Context, sigil operations.Sigil, src, dst fs.DirEntry, err error) {
+	b.queueOpt.lock.Lock()
+	defer b.queueOpt.lock.Unlock()

 	opt := operations.GetLoggerOpt(ctx)
 	result := Results{
@@ -131,14 +131,14 @@ func WriteResults(ctx context.Context, sigil operations.Sigil, src, dst fs.DirEn
 		result.Flags = "-"
 		if side != nil {
 			result.Size = side.Size()
-			if !ignoreListingModtime {
+			if !b.queueOpt.ignoreListingModtime {
 				result.Modtime = side.ModTime(ctx).In(TZ)
 			}
-			if !ignoreListingChecksum {
+			if !b.queueOpt.ignoreListingChecksum {
 				sideObj, ok := side.(fs.ObjectInfo)
 				if ok {
-					result.Hash, _ = sideObj.Hash(ctx, getHashType(sideObj.Fs().Name()))
-					result.Hash, _ = tryDownloadHash(ctx, sideObj, result.Hash)
+					result.Hash, _ = sideObj.Hash(ctx, b.getHashType(sideObj.Fs().Name()))
+					result.Hash, _ = b.tryDownloadHash(ctx, sideObj, result.Hash)
 				}

 			}
@@ -159,8 +159,8 @@ func WriteResults(ctx context.Context, sigil operations.Sigil, src, dst fs.DirEn
 		}

 		prettyprint(result, "writing result", fs.LogLevelDebug)
-		if result.Size < 0 && result.Flags != "d" && ((queueCI.CheckSum && !downloadHash) || queueCI.SizeOnly) {
-			once.Do(func() {
+		if result.Size < 0 && result.Flags != "d" && ((b.queueOpt.queueCI.CheckSum && !b.downloadHashOpt.downloadHash) || b.queueOpt.queueCI.SizeOnly) {
+			b.queueOpt.once.Do(func() {
 				fs.Log(result.Name, Color(terminal.YellowFg, "Files of unknown size (such as Google Docs) do not sync reliably with --checksum or --size-only. Consider using modtime instead (the default) or --drive-skip-gdocs"))
 			})
 		}
@@ -189,14 +189,14 @@ func ReadResults(results io.Reader) []Results {

 // for setup code shared by both fastCopy and resyncDir
 func (b *bisyncRun) preCopy(ctx context.Context) context.Context {
-	queueCI = fs.GetConfig(ctx)
-	ignoreListingChecksum = b.opt.IgnoreListingChecksum
-	ignoreListingModtime = !b.opt.Compare.Modtime
-	hashTypes = map[string]hash.Type{
+	b.queueOpt.queueCI = fs.GetConfig(ctx)
+	b.queueOpt.ignoreListingChecksum = b.opt.IgnoreListingChecksum
+	b.queueOpt.ignoreListingModtime = !b.opt.Compare.Modtime
+	b.queueOpt.hashTypes = map[string]hash.Type{
 		b.fs1.Name(): b.opt.Compare.HashType1,
 		b.fs2.Name(): b.opt.Compare.HashType2,
 	}
-	logger.LoggerFn = WriteResults
+	b.queueOpt.logger.LoggerFn = b.WriteResults
 	overridingEqual := false
 	if (b.opt.Compare.Modtime && b.opt.Compare.Checksum) || b.opt.Compare.DownloadHash {
 		overridingEqual = true
@@ -209,15 +209,15 @@ func (b *bisyncRun) preCopy(ctx context.Context) context.Context {
 		fs.Debugf(nil, "overriding equal")
 		ctx = b.EqualFn(ctx)
 	}
-	ctxCopyLogger := operations.WithSyncLogger(ctx, logger)
+	ctxCopyLogger := operations.WithSyncLogger(ctx, b.queueOpt.logger)
 	if b.opt.Compare.Checksum && (b.opt.Compare.NoSlowHash || b.opt.Compare.SlowHashSyncOnly) && b.opt.Compare.SlowHashDetected {
 		// set here in case !b.opt.Compare.Modtime
-		queueCI = fs.GetConfig(ctxCopyLogger)
+		b.queueOpt.queueCI = fs.GetConfig(ctxCopyLogger)
 		if b.opt.Compare.NoSlowHash {
-			queueCI.CheckSum = false
+			b.queueOpt.queueCI.CheckSum = false
 		}
 		if b.opt.Compare.SlowHashSyncOnly && !overridingEqual {
-			queueCI.CheckSum = true
+			b.queueOpt.queueCI.CheckSum = true
 		}
 	}
 	return ctxCopyLogger
@@ -250,9 +250,9 @@ func (b *bisyncRun) fastCopy(ctx context.Context, fsrc, fdst fs.Fs, files bilib.
 	ctxCopy, b.CancelSync = context.WithCancel(ctxCopy)
 	b.testFn()
 	err := sync.Sync(ctxCopy, fdst, fsrc, b.opt.CreateEmptySrcDirs)
-	prettyprint(logger, "logger", fs.LogLevelDebug)
+	prettyprint(b.queueOpt.logger, "b.queueOpt.logger", fs.LogLevelDebug)

-	getResults := ReadResults(logger.JSON)
+	getResults := ReadResults(b.queueOpt.logger.JSON)
 	fs.Debugf(nil, "Got %v results for %v", len(getResults), queueName)

 	lineFormat := "%s %8d %s %s %s %q\n"
@@ -292,9 +292,9 @@ func (b *bisyncRun) resyncDir(ctx context.Context, fsrc, fdst fs.Fs) ([]Results,
 	ctx = b.preCopy(ctx)

 	err := sync.CopyDir(ctx, fdst, fsrc, b.opt.CreateEmptySrcDirs)
-	prettyprint(logger, "logger", fs.LogLevelDebug)
+	prettyprint(b.queueOpt.logger, "b.queueOpt.logger", fs.LogLevelDebug)

-	getResults := ReadResults(logger.JSON)
+	getResults := ReadResults(b.queueOpt.logger.JSON)
 	fs.Debugf(nil, "Got %v results for %v", len(getResults), "resync")

 	return getResults, err
--- a/cmd/bisync/resolve.go
+++ b/cmd/bisync/resolve.go
@@ -135,7 +135,7 @@ type namePair struct {
 	newName string
 }

-func (b *bisyncRun) resolve(ctxMove context.Context, path1, path2, file, alias string, renameSkipped, copy1to2, copy2to1 *bilib.Names, ds1, ds2 *deltaSet) error {
+func (b *bisyncRun) resolve(ctxMove context.Context, path1, path2, file, alias string, renameSkipped, copy1to2, copy2to1 *bilib.Names, ds1, ds2 *deltaSet) (err error) {
 	winningPath := 0
 	if b.opt.ConflictResolve != PreferNone {
 		winningPath = b.conflictWinner(ds1, ds2, file, alias)
@@ -261,15 +261,15 @@ func (ri *renamesInfo) getNames(is1to2 bool) (srcOldName, srcNewName, dstOldName
 func (b *bisyncRun) numerate(ctx context.Context, startnum int, file, alias string) int {
 	for i := startnum; i < math.MaxInt; i++ {
 		iStr := fmt.Sprint(i)
-		if !ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
-			!ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) &&
-			!ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
-			!ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) {
+		if !b.march.ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
+			!b.march.ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) &&
+			!b.march.ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
+			!b.march.ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) {
 			// make sure it still holds true with suffixes switched (it should)
-			if !ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
-				!ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) &&
-				!ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
-				!ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) {
+			if !b.march.ls1.has(SuffixName(ctx, file, b.opt.ConflictSuffix2+iStr)) &&
+				!b.march.ls1.has(SuffixName(ctx, alias, b.opt.ConflictSuffix2+iStr)) &&
+				!b.march.ls2.has(SuffixName(ctx, file, b.opt.ConflictSuffix1+iStr)) &&
+				!b.march.ls2.has(SuffixName(ctx, alias, b.opt.ConflictSuffix1+iStr)) {
 				fs.Debugf(file, "The first available suffix is: %s", iStr)
 				return i
 			}
@@ -280,10 +280,10 @@ func (b *bisyncRun) numerate(ctx context.Context, startnum int, file, alias stri

 // like numerate, but consider only one side's suffix (for when suffixes are different)
 func (b *bisyncRun) numerateSingle(ctx context.Context, startnum int, file, alias string, path int) int {
-	lsA, lsB := ls1, ls2
+	lsA, lsB := b.march.ls1, b.march.ls2
 	suffix := b.opt.ConflictSuffix1
 	if path == 2 {
-		lsA, lsB = ls2, ls1
+		lsA, lsB = b.march.ls2, b.march.ls1
 		suffix = b.opt.ConflictSuffix2
 	}
 	for i := startnum; i < math.MaxInt; i++ {
@@ -299,7 +299,7 @@ func (b *bisyncRun) numerateSingle(ctx context.Context, startnum int, file, alia
 	return 0 // not really possible, as no one has 9223372036854775807 conflicts, and if they do, they have bigger problems
 }

-func (b *bisyncRun) rename(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum, winningPath int, q, renameSkipped *bilib.Names) error {
+func (b *bisyncRun) rename(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum, winningPath int, q, renameSkipped *bilib.Names) (err error) {
 	if winningPath == thisPathNum {
 		b.indent(fmt.Sprintf("!Path%d", thisPathNum), thisPath+thisNamePair.newName, fmt.Sprintf("Not renaming Path%d copy, as it was determined the winner", thisPathNum))
 	} else {
@@ -321,7 +321,7 @@ func (b *bisyncRun) rename(ctx context.Context, thisNamePair namePair, thisPath,
 	return nil
 }

-func (b *bisyncRun) delete(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum int, renameSkipped *bilib.Names) error {
+func (b *bisyncRun) delete(ctx context.Context, thisNamePair namePair, thisPath, thatPath string, thisFs fs.Fs, thisPathNum, thatPathNum int, renameSkipped *bilib.Names) (err error) {
 	skip := operations.SkipDestructive(ctx, thisNamePair.oldName, "delete")
 	if !skip {
 		b.indent(fmt.Sprintf("!Path%d", thisPathNum), thisPath+thisNamePair.oldName, fmt.Sprintf("Deleting Path%d copy", thisPathNum))
--- a/cmd/bisync/resync.go
+++ b/cmd/bisync/resync.go
@@ -41,12 +41,12 @@ func (b *bisyncRun) setResyncDefaults() {
 // It will generate path1 and path2 listings,
 // copy any unique files to the opposite path,
 // and resolve any differing files according to the --resync-mode.
-func (b *bisyncRun) resync(octx, fctx context.Context) error {
+func (b *bisyncRun) resync(octx, fctx context.Context) (err error) {
 	fs.Infof(nil, "Copying Path2 files to Path1")

 	// Save blank filelists (will be filled from sync results)
-	var ls1 = newFileList()
-	var ls2 = newFileList()
+	ls1 := newFileList()
+	ls2 := newFileList()
 	err = ls1.save(fctx, b.newListing1)
 	if err != nil {
 		b.handleErr(ls1, "error saving ls1 from resync", err, true, true)
--- a/docs/content/bisync.md
+++ b/docs/content/bisync.md
@@ -1815,6 +1815,9 @@ about _Unison_ and synchronization in general.

 ## Changelog

+### `v1.71`
+* Fixed an issue causing errors when running concurrent bisync runs through the `rc`.
+
 ### `v1.69.1`
 * Fixed an issue causing listings to not capture concurrent modifications under certain conditions