mirror of
https://github.com/vbatts/go-mtree.git
synced 2024-11-25 17:45:39 +00:00
Vincent Batts
faa80931af
when creating a manifest from, or validating, a stream like a tar archive, it requires thinking about some of the functions differently than walking a directory tree. This is the beginning of allowing for such features. Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
package mtree
|
|
|
|
import (
|
|
"fmt"
|
|
"path/filepath"
|
|
"strings"
|
|
)
|
|
|
|
type byPos []Entry
|
|
|
|
func (bp byPos) Len() int { return len(bp) }
|
|
func (bp byPos) Less(i, j int) bool { return bp[i].Pos < bp[j].Pos }
|
|
func (bp byPos) Swap(i, j int) { bp[i], bp[j] = bp[j], bp[i] }
|
|
|
|
// Entry is each component of content in the mtree spec file
|
|
type Entry struct {
|
|
Parent *Entry // up
|
|
Children []*Entry // down
|
|
Prev, Next *Entry // left, right
|
|
Set *Entry // current `/set` for additional keywords
|
|
Pos int // order in the spec
|
|
Raw string // file or directory name
|
|
Name string // file or directory name
|
|
Keywords []string // TODO(vbatts) maybe a keyword typed set of values?
|
|
Type EntryType
|
|
}
|
|
|
|
// Path provides the full path of the file, despite RelativeType or FullType
|
|
func (e Entry) Path() string {
|
|
if e.Parent == nil || e.Type == FullType {
|
|
return filepath.Clean(e.Name)
|
|
}
|
|
return filepath.Clean(filepath.Join(e.Parent.Path(), e.Name))
|
|
}
|
|
|
|
func (e Entry) String() string {
|
|
if e.Raw != "" {
|
|
return e.Raw
|
|
}
|
|
if e.Type == BlankType {
|
|
return ""
|
|
}
|
|
if e.Type == DotDotType {
|
|
return e.Name
|
|
}
|
|
// TODO(vbatts) if type is RelativeType and a keyword of not type=dir
|
|
if e.Type == SpecialType || e.Type == FullType || inSlice("type=dir", e.Keywords) {
|
|
return fmt.Sprintf("%s %s", e.Name, strings.Join(e.Keywords, " "))
|
|
}
|
|
return fmt.Sprintf(" %s %s", e.Name, strings.Join(e.Keywords, " "))
|
|
}
|
|
|
|
// EntryType are the formats of lines in an mtree spec file
|
|
type EntryType int
|
|
|
|
// The types of lines to be found in an mtree spec file
|
|
const (
|
|
SignatureType EntryType = iota // first line of the file, like `#mtree v2.0`
|
|
BlankType // blank lines are ignored
|
|
CommentType // Lines beginning with `#` are ignored
|
|
SpecialType // line that has `/` prefix issue a "special" command (currently only /set and /unset)
|
|
RelativeType // if the first white-space delimited word does not have a '/' in it. Options/keywords are applied.
|
|
DotDotType // .. - A relative path step. keywords/options are ignored
|
|
FullType // if the first word on the line has a `/` after the first character, it interpretted as a file pathname with options
|
|
)
|
|
|
|
// String returns the name of the EntryType
|
|
func (et EntryType) String() string {
|
|
return typeNames[et]
|
|
}
|
|
|
|
var typeNames = map[EntryType]string{
|
|
SignatureType: "SignatureType",
|
|
BlankType: "BlankType",
|
|
CommentType: "CommentType",
|
|
SpecialType: "SpecialType",
|
|
RelativeType: "RelativeType",
|
|
DotDotType: "DotDotType",
|
|
FullType: "FullType",
|
|
}
|