For the easy stackable filesystem OverlayFS you have to prepair:
- Lower folder (Where the source files are), can be and will be read only
- Upper folder (This will cover the source files), will hold everything you write
- Merge folder (The path for your project), empty
- Work folder (Application internals, nothing for the user)
As an example: mount the folder "/tmp/ov/up" over "/tmp/ov/low" at "/tmp/ov/merge":
sudo mount -t overlay overlay -o lowerdir=/tmp/ov/low,upperdir=/tmp/ov/up,workdir=/tmp/ov/work /tmp/ov/merge
Result:
tree -ap /tmp/ov/
/tmp/ov/
├── [drwxr-xr-x] low
│ ├── [-rw-r--r--] test2
│ └── [-rw-r--r--] test3
├── [drwxr-xr-x] merge
│ ├── [-rw-r--r--] test1
│ ├── [-rw-r--r--] test3
│ └── [-rw-r--r--] test4
├── [drwxr-xr-x] up
│ ├── [-rw-r--r--] test1
│ ├── [c---------] test2
│ ├── [-rw-r--r--] test3
│ └── [-rw-r--r--] test4
└── [drwxr-xr-x] work
└── [d---------] work [error opening dir]
File "up/test2" is a special charakter file (c) which is used as internal note to hide "low/test2" because it is marked as deleted.
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(Edited 18-07-19)
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