build: fix linting issues reported by running golangci-lint with different GOOS

backend/azureblob/azureblob_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9 || solaris || js
 
+// Package azureblob provides an interface to the Microsoft Azure blob object storage system
 package azureblob

backend/azurefiles/azurefiles_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9 || js
 
+// Package azurefiles provides an interface to Microsoft Azure Files
 package azurefiles

backend/cache/cache_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9 || js
 
+// Package cache implements a virtual provider to cache existing remotes.
 package cache

backend/cache/utils_test.go

@@ -1,3 +1,6 @@
+//go:build !plan9 && !js
+// +build !plan9,!js
+
 package cache
 
 import bolt "go.etcd.io/bbolt"

backend/hdfs/hdfs_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9
 
+// Package hdfs provides an interface to the HDFS storage system.
 package hdfs

backend/local/about_unix.go

@@ -23,9 +23,9 @@ func (f *Fs) About(ctx context.Context) (*fs.Usage, error) {
 	}
 	bs := int64(s.Bsize) // nolint: unconvert
 	usage := &fs.Usage{
-		Total: fs.NewUsageValue(bs * int64(s.Blocks)),         // quota of bytes that can be used
-		Used:  fs.NewUsageValue(bs * int64(s.Blocks-s.Bfree)), // bytes in use
-		Free:  fs.NewUsageValue(bs * int64(s.Bavail)),         // bytes which can be uploaded before reaching the quota
+		Total: fs.NewUsageValue(bs * int64(s.Blocks)),         //nolint: unconvert // quota of bytes that can be used
+		Used:  fs.NewUsageValue(bs * int64(s.Blocks-s.Bfree)), //nolint: unconvert // bytes in use
+		Free:  fs.NewUsageValue(bs * int64(s.Bavail)),         //nolint: unconvert // bytes which can be uploaded before reaching the quota
 	}
 	return usage, nil
 }

backend/local/metadata_other.go

@@ -1,4 +1,4 @@
-//go:build plan9 || js
+//go:build dragonfly || plan9 || js
 
 package local
 

backend/local/xattr_unsupported.go

@@ -1,6 +1,7 @@
+// The pkg/xattr module doesn't compile for openbsd or plan9
+
 //go:build openbsd || plan9
 
-// The pkg/xattr module doesn't compile for openbsd or plan9
 package local
 
 import "github.com/rclone/rclone/fs"

backend/oracleobjectstorage/oracleobjectstorage_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9 || solaris || js
 
+// Package oracleobjectstorage provides an interface to the OCI object storage system.
 package oracleobjectstorage

backend/qingstor/qingstor_unsupported.go

@@ -3,4 +3,6 @@
 
 //go:build plan9 || js
 
+// Package qingstor provides an interface to QingStor object storage
+// Home: https://www.qingcloud.com/
 package qingstor

backend/sftp/sftp_unsupported.go

@@ -3,4 +3,5 @@
 
 //go:build plan9
 
+// Package sftp provides a filesystem interface using github.com/pkg/sftp
 package sftp

backend/storj/storj_unsupported.go

@@ -1,3 +1,4 @@
 //go:build plan9
 
+// Package storj provides an interface to Storj decentralized object storage.
 package storj