Matheus Sampaio Queiroga
44092f50ee
Add new functions to Go Overlayfs: - Create(name string) (*File, error) - Open(name string) (*File, error) - OpenFile(name string, flag int, perm FileMode) (*File, error) - Remove(name string) error - Rename(oldpath, newpath string) error - Truncate(name string, size int64) error - Stat(name string) (FileInfo, error) - Chmod(name string, mode FileMode) error - Chown(name string, uid, gid int) error - Symlink(oldname, newname string) error - Readlink(name string) (string, error) - Mkdir(name string, perm FileMode) error - MkdirAll(path string, perm FileMode) error - RemoveAll(path string) error Reviewed-on: go-bds/go-bds#25 Co-authored-by: Matheus Sampaio Queiroga <srherobrine20@gmail.com> Co-committed-by: Matheus Sampaio Queiroga <srherobrine20@gmail.com>
52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
// Implements Overlayfs/Mergefs mount
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//
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// for Linux use kernel overlayfs
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//
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// for Windows use winfsp + go-bds/Overlayfs to mount overlayfs
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//
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// another platforms return ErrNotOverlayAvaible
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package overlayfs
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import (
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"errors"
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)
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var (
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ErrNotOverlayAvaible error = errors.New("overlayfs not avaible") // Current system ou another variables cannot mount merge filesystem or similar
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ErrNoCGOAvaible error = errors.New("cgo is disabled to process syscall's") // Cannot mount mergefs/overlayfs with cgo disabled
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ErrMounted error = errors.New("current path is mounted") // Path target current as mounted
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ErrUnmounted error = errors.New("path not mounted")
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)
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// Implements a linux Overlayfs in Golang
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//
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// We maintain some so -like om of [the] but with
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// modifications only in their defined structures,
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// If you do not have a upper folder any writing will be fully blocked
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//
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//
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// * Notes to, Mount(), Unmount() this functions to mount mergefs or overlayfs in kernel/system level if avaible
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type Overlayfs struct {
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Target string // Destination folder with all Upper and Lower layers merged
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Upper string // Folder to write modifications, blank to read-only
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Lower []string // Folders layers, read-only
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Workdir string // Folder to write temporary files, only linux required
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ProcessInternal any // Save any information to Mount and Unmount
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}
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// Return new Overlayfs
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//
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// Crate new *Overlayfs with values, examples:
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//
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// NewOverlayFS("/Root", "/data", "/workdir", "/low1", "/low2") // To read-write target
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// NewOverlayFS("/Root", "", "", "/low1", "/low2") // To read-only target
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func NewOverlayFS(TargetFolder, TopLayer, WorkdirFolder string, LowLayers ...string) *Overlayfs {
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return &Overlayfs{
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Target: TargetFolder,
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Lower: LowLayers,
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Upper: TopLayer,
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Workdir: WorkdirFolder,
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}
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}
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