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1// chroot.go implements the interface billy.Chroot
2
3package s3fs
4
5import "github.com/go-git/go-billy/v6"
6
7// Chroot returns a new filesystem from the same type where the new root is
8// the given path. Files outside of the designated directory tree cannot be
9// accessed.
10func (fs3 *S3FS) Chroot(path string) (billy.Filesystem, error) {
11 // TODO: Check that path is a valid subdirectory of the current root
12 // ...
13
14 // Calculate the new root
15 p := fs3.Join(fs3.root, path)
16
17 // Create the new S3FS with the new root directory. The separator must be
18 // carried over; without it ListObjectsV2 runs with an empty delimiter and
19 // ReadDir flattens the tree, breaking directory-structured reads (e.g. git
20 // ref enumeration under refs/).
21 nfs := &S3FS{
22 client: fs3.client,
23 bucket: fs3.bucket,
24 root: p,
25 separator: fs3.separator,
26 unixMeta: fs3.unixMeta,
27 cache: fs3.cache,
28 packCache: fs3.packCache,
29 temps: make(map[string]*tempBuffer),
30 }
31
32 // A chroot is one repository. Register its root as a recursive subtree prefix
33 // so the whole repo is answered from one delimiter-less scan: this is what
34 // makes subtree caching actually engage for the canonical "<repo>/refs/...",
35 // "<repo>/objects/..." keys (a bucket-root prefix like "refs/" never matches
36 // them), collapsing git's per-object and per-folder listings into one.
37 if fs3.cache != nil && p != "" && p != "." {
38 fs3.cache.registerRoot(p)
39 }
40 return nfs, nil
41}
42
43// Root returns the root path of the filesystem.
44func (fs3 *S3FS) Root() string {
45 return fs3.root
46}