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options.go
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options.go
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package copy
import "os"
// Options specifies optional actions on copying.
type Options struct {
// OnSymlink can specify what to do on symlink
OnSymlink func(src string) SymlinkAction
// OnDirExists can specify what to do when there is a directory already existing in destination.
OnDirExists func(src, dest string) DirExistsAction
// Skip can specify which files should be skipped
Skip func(src string) (bool, error)
// AddPermission to every entities,
// NO MORE THAN 0777
AddPermission os.FileMode
// Sync file after copy.
// Useful in case when file must be on the disk
// (in case crash happens, for example),
// at the expense of some performance penalty
Sync bool
// Preserve the atime and the mtime of the entries
// On linux we can preserve only up to 1 millisecond accuracy
PreserveTimes bool
intent struct {
src string
dest string
}
}
// SymlinkAction represents what to do on symlink.
type SymlinkAction int
const (
// Deep creates hard-copy of contents.
Deep SymlinkAction = iota
// Shallow creates new symlink to the dest of symlink.
Shallow
// Skip does nothing with symlink.
Skip
)
// DirExistsAction represents what to do on dest dir.
type DirExistsAction int
const (
// Merge preserves or overwrites existing files under the dir (default behavior).
Merge DirExistsAction = iota
// Replace deletes all contents under the dir and copy src files.
Replace
// Untouchable does nothing for the dir, and leaves it as it is.
Untouchable
)
// getDefaultOptions provides default options,
// which would be modified by usage-side.
func getDefaultOptions(src, dest string) Options {
return Options{
OnSymlink: func(string) SymlinkAction {
return Shallow // Do shallow copy
},
OnDirExists: nil, // Default behavior is "Merge".
Skip: func(string) (bool, error) {
return false, nil // Don't skip
},
AddPermission: 0, // Add nothing
Sync: false, // Do not sync
PreserveTimes: false, // Do not preserve the modification time
intent: struct {
src string
dest string
}{src, dest},
}
}