go-layerfs
This is a simple wrapper around multiple fs.FS instances, recursively merging them together dynamically.
If you have two directories, of which one is called examples/upper and the other examples/lower, you can layer upper over lower like this:
import (
"os"
"path/filepath"
"github.com/dschmidt/go-layerfs"
)
upper, _ := filepath.Abs("examples/upper")
lower, _ := filepath.Abs("examples/lower")
fsys := layerfs.New(os.DirFS(upper), os.DirFS(lower))
If examples/upper looks like this
.
├── dir1
│ ├── f11.txt (content: foo)
│ └── f12.txt (content: foo)
├── f1.txt (content: foo)
└── f2.txt (content: foo)
and examples/lower looks like this
.
├── dir1
│ ├── f12.txt (content: bar)
│ └── f13.txt (content: bar)
├── f2.txt (content: bar)
└── f3.txt (content: bar)
then your fsys looks like this:
.
├── dir1
│ ├── f11.txt (content: foo)
│ ├── f12.txt (content: foo)
│ └── f13.txt (content: bar)
├── f1.txt (content: foo)
├── f2.txt (content: foo)
└── f3.txt (content: bar)
Example usage
You can run examples/file_server.go like this:
go run examples/file_server.go
2021/11/17 22:59:22 Listening on :8090...
Then requests via httpie should give you these results:
http GET http://localhost:8090/files
HTTP/1.1 200 OK
Content-Length: 123
Content-Type: text/html; charset=utf-8
Date: Wed, 17 Nov 2021 22:03:21 GMT
Last-Modified: Wed, 17 Nov 2021 21:55:53 GMT
<pre>
<a href="dir1/">dir1/</a>
<a href="f1.txt">f1.txt</a>
<a href="f2.txt">f2.txt</a>
<a href="f3.txt">f3.txt</a>
</pre>
http GET http://localhost:8090/files/f1.txt
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 3
Content-Type: text/plain; charset=utf-8
Date: Wed, 17 Nov 2021 22:05:29 GMT
Last-Modified: Wed, 17 Nov 2021 21:56:26 GMT
foo
http GET http://localhost:8090/files/f3.txt
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 3
Content-Type: text/plain; charset=utf-8
Date: Wed, 17 Nov 2021 22:05:56 GMT
Last-Modified: Wed, 17 Nov 2021 21:56:30 GMT
bar
180 Dec 28, 2022
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0 Feb 5, 2022
18 Dec 7, 2022
9 Sep 2, 2022
4 Aug 16, 2022
0 Jan 9, 2022
15 Oct 2, 2022
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1 Mar 12, 2022
176 Dec 31, 2022
3 Apr 27, 2022
83 Jan 5, 2023
1.4k Jan 4, 2023
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