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https://github.com/falk-werner/webfuse
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add some documentation
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Falk Werner
parent
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doc/protocol.md
238
doc/protocol.md
@ -277,16 +277,20 @@ _Note that the following numbers are in `hexadecimal` notation._
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## Methods
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Since `webfuse2` aims to communicate the `libfuse API` over a `websocket` connection, `webfuse2` methods are tightly connected to [fuse operations](https://libfuse.github.io/doxygen/structfuse__operations.html) which itself have a tight connection to `posix filesystem operations`. Therefore, additional information about most `webfuse2` operations can be found in the [fuse operations documentation](https://libfuse.github.io/doxygen/structfuse__operations.html) and / or the [man pages](https://man7.org/index.html).
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### access
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Checks the user's permissions for a file (see [man access(2)](https://man7.org/linux/man-pages/man2/access.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ----- | ---------------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x01) |
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| path | string | |
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| mode | access_mode (i8) |
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| path | string | path of file to check |
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| mode | access_mode (i8) | access mode to check |
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#### Response
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@ -298,258 +302,337 @@ _Note that the following numbers are in `hexadecimal` notation._
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### getattr
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Retrieve file attributes (see [man getattr(2)](https://man7.org/linux/man-pages/man2/getxattr.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x02) |
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| path | string | path |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| --------- | ---------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x82) |
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| result | result | operation status |
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| attibutes | attributes | attributes of file |
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### readlink
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Read value of a symbolik link (see [man readlink(2)](https://man7.org/linux/man-pages/man2/readlink.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x03) |
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| path | string | path of link |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| -------- | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x83) |
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| result | result | operation status |
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| resolved | string | resolved path |
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### symlink
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Make a new name of a file (see [man symlink(2)](https://man7.org/linux/man-pages/man2/symlink.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| -------- | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x04) |
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| target | string | target of link |
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| linkpath | string | name of the link |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x84) |
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| result | result | operation status |
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### link
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Make a new name for a file (see [man link(2)](https://man7.org/linux/man-pages/man2/link.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| -------- | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x05) |
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| old_path | string | path of the existing file |
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| new_path | string | new name of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x85) |
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| result | result | operation status |
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### rename
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Change the name of a file (see [man rename(2)](https://man7.org/linux/man-pages/man2/rename.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| -------- | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x06) |
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| old_path | string | old name of the file |
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| new_path | string | new name of the file |
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| flags | rename_flags (u8) | flags to control the rename operation |
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The following `flags` are defined:
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- **0x00:** move the file from `old_path` to `new_path`
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- **0x01 (RENAME_NOREPLACE):** do not override `new_path`
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This results in an error, when `new_path` already exists.
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- **0x02 (RENAME_EXCHANGE):** atomically exchange the files
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x86) |
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| result | result | operation status |
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### chmod
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Change permissions of a file (see [man chmod(2)](https://man7.org/linux/man-pages/man2/chmod.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| ------ | ---------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x07) |
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| path | string | path of the file |
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| mode | mode (u32) | new file permissions |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x87) |
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| result | result | operation status |
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### chown
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Change ownership of a file (see [man chown(2)](https://man7.org/linux/man-pages/man2/chown.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x08) |
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| path | string | path of the file |
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| uid | uid (u32) | user id of the new owner |
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| gid | gid (u32) | group id of the new owning group |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x88) |
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| result | result | operation status |
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### truncate
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Truncate a file to a specified length (see [man truncate(2)](https://man7.org/linux/man-pages/man2/truncate64.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| ------ | ------------ | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x09) |
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| path | string | path of the file |
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| size | u64 | new file size |
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| handle | handle (u64) | handle of the file |
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_Note that handle might be invalid (-1), even if the file is open._
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x89) |
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| result | result | operation status |
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### fsync
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Sychronize a file's in-core state with storage device (see [man fsync(2)](https://man7.org/linux/man-pages/man2/fsync.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0a) |
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| path | string | path of the file |
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| is_datasync | bool | if true, sync only user data |
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| handle | handle (u64) | handle of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8a) |
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| result | result | operation status |
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### open
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Open and possibly create a file ([man open(2)](https://man7.org/linux/man-pages/man2/open.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0b) |
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| path | string | path of the file |
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| flags | open_flags (i32) | flags |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8b) |
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| result | result | operation status |
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| handle | handle (u64) | handle of the file |
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### mknod
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Create a special or ordinary file (see [man mknod(2)](https://man7.org/linux/man-pages/man2/mknod.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0c) |
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| path | string | path of the file |
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| mode | mode (u32) | mode of the file |
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| dev | dev (64) | device type |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8c) |
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| result | result | operation status |
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### create
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Create a new file or rewrite an existing one (see [man creat(3p)](https://man7.org/linux/man-pages/man3/creat.3p.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0d) |
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| path | string | path of the file |
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| mode | mode (u32) | mode of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8d) |
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| result | result | operation status |
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| handle | handle (u64) | handle of the file |
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### release
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Releases a file handle (see [man close(2)](https://man7.org/linux/man-pages/man2/close.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0e) |
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| path | string | path of the file |
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| handle | handle (u64) | handle of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8e) |
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| result | result | operation status |
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### unlink
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Delete a name and possibly the file it refers to ([man unlink(2)](https://man7.org/linux/man-pages/man2/unlink.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x0f) |
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| path | string | path of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x8f) |
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| result | result | operation status |
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### read
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Read from a file description (see [man read(2)](https://man7.org/linux/man-pages/man2/read.2.html), [man pread(2)](https://man7.org/linux/man-pages/man2/pread.2.html)).
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#### Request
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x10) |
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| path | string | path of the file |
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| buffer_size | u32 | max. amount of bytes requested |
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| offset | u64 | offset of the file |
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| handle | handle (u64) | handle of the file |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x90) |
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| result | result | operation status |
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| data | bytes | requested data |
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### write
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@ -558,14 +641,14 @@ _Note that the following numbers are in `hexadecimal` notation._
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x17) |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x91) |
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| result | result | operation status |
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### mkdir
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@ -575,14 +658,14 @@ _Note that the following numbers are in `hexadecimal` notation._
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x12) |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x92) |
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| result | result | operation status |
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### readdir
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@ -592,14 +675,14 @@ _Note that the following numbers are in `hexadecimal` notation._
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x13) |
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#### Response
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x93) |
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| result | result | operation status |
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### rmdir
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@ -609,14 +692,14 @@ _Note that the following numbers are in `hexadecimal` notation._
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x14) |
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#### Response
|
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|
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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| type | u8 | message type (0x81) |
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| type | u8 | message type (0x94) |
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| result | result | operation status |
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### statfs
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@ -626,29 +709,82 @@ _Note that the following numbers are in `hexadecimal` notation._
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
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||||
| type | u8 | message type (0x81) |
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| type | u8 | message type (0x15) |
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#### Response
|
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|
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| Field | Data Type | Description |
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| ------ | --------- | ----------- |
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| id | u32 | message id |
|
||||
| type | u8 | message type (0x81) |
|
||||
| type | u8 | message type (0x95) |
|
||||
| result | result | operation status |
|
||||
|
||||
### utimens
|
||||
|
||||
Change the file timestamps with nanosecond precision ([man utimesat(2)](https://man7.org/linux/man-pages/man2/utimensat.2.html)).
|
||||
|
||||
#### Request
|
||||
|
||||
| Field | Data Type | Description |
|
||||
| ------ | --------- | ----------- |
|
||||
| id | u32 | message id |
|
||||
| type | u8 | message type (0x81) |
|
||||
| type | u8 | message type (0x16) |
|
||||
| path | string | path of the file |
|
||||
| atime | timestamp | new last access time |
|
||||
| mtime | timestamp | new last modified time |
|
||||
| handle | handle (u64) | handle of the file |
|
||||
|
||||
_Note that handle might be invalid (-1), even if the file is open._
|
||||
|
||||
#### Response
|
||||
|
||||
| Field | Data Type | Description |
|
||||
| ------ | --------- | ----------- |
|
||||
| id | u32 | message id |
|
||||
| type | u8 | message type (0x81) |
|
||||
| type | u8 | message type (0x96) |
|
||||
| result | result | operation status |
|
||||
|
||||
## Examples
|
||||
|
||||
### Get file attributes
|
||||
|
||||
````
|
||||
service -> provider:
|
||||
00 00 00 01 # message id = 1
|
||||
02 # message type = getattr request
|
||||
01 '/' # path = "/"
|
||||
|
||||
provider -> service:
|
||||
00 00 00 01 # message id = 1
|
||||
82 # message type = getattr response
|
||||
00 00 00 00 # result = 0 (OK)
|
||||
00 00 00 00 00 00 00 01 # attributes.inode = 1
|
||||
00 00 00 00 00 00 00 02 # attributes.nlink = 2
|
||||
00 00 41 a4 # attributes.mode = 0o40644 (S_IDDIR | 0o0644)
|
||||
00 00 03 e8 # attributes.uid = 1000
|
||||
00 00 03 e8 # attributes.gid = 1000
|
||||
00 00 00 00 00 00 00 00 # attributes.size = 0
|
||||
00 00 00 00 00 00 00 00 # attributes.blocks = 0
|
||||
00 00 00 00 00 00 00 00 # attrbites.atime.sec = 0
|
||||
00 00 00 00 00 # attributs.atime.nsec = 0
|
||||
00 00 00 00 00 00 00 00 # attrbites.mtime.sec = 0
|
||||
00 00 00 00 00 # attributs.mtime.nsec = 0
|
||||
00 00 00 00 00 00 00 00 # attrbites.ctime.sec = 0
|
||||
00 00 00 00 00 # attributs.ctime.nsec = 0
|
||||
````
|
||||
|
||||
### Get file attributes (Failure)
|
||||
|
||||
_Note that attributs are skipped in case of an error._
|
||||
|
||||
````
|
||||
service -> provider:
|
||||
00 00 00 01 # message id = 1
|
||||
02 # message type = getattr request
|
||||
04 "/foo" # path = "/foo"
|
||||
|
||||
provider -> service:
|
||||
00 00 00 01 # message id = 1
|
||||
82 # message type = getattr response
|
||||
ff ff ff fe # result = -2 (ENOENT)
|
||||
````
|
||||
|
||||
Loading…
Reference in New Issue
Block a user