Class: fs

LuCI.fs

Provides high level utilities to wrap file system related RPC calls. To import the class in views, use 'require fs', to import it in external JavaScript, use L.require("fs").then(...).

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Methods

exec(command, paramsopt, envopt) → {Promise.<LuCI.fs.FileExecResult>}

Execute the specified command, optionally passing params and environment variables.

Note: The command must be either the path to an executable, or a basename without arguments in which case it will be searched in $PATH. If specified, the values given in params will be passed as arguments to the command.

The key/value pairs in the optional env table are translated to setenv() calls prior to running the command.

Parameters:
Name Type Attributes Description
command string

The command to invoke.
params Array.<string> <optional>

The arguments to pass to the command.
env Object.<string, string> <optional>

Environment variables to set.
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Returns:

Returns a promise resolving to an object describing the execution results or rejecting with an error stating the failure reason.

Type
Promise.<LuCI.fs.FileExecResult>

lines(path) → {Promise.<Array.<string>>}

Read the contents of the given file, split it into lines, trim leading and trailing white space of each line and return the resulting array.

This function is guaranteed to not reject its promises, on failure, an empty array will be returned.

Parameters:
Name Type Description
path string

The file path to read.
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Returns:

Returns a promise resolving to an array containing the stripped lines of the given file or [] on failure.

Type
Promise.<Array.<string>>

list(path) → {Promise.<Array.<LuCI.fs.FileStatEntry>>}

Obtains a listing of the specified directory.

Parameters:
Name Type Description
path string

The directory path to list.
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Returns:

Returns a promise resolving to an array of stat detail objects or rejecting with an error stating the failure reason.

Type
Promise.<Array.<LuCI.fs.FileStatEntry>>

read(path) → {Promise.<string>}

Read the contents of the given file and return them. Note: this function is unsuitable for obtaining binary data.

Parameters:
Name Type Description
path string

The file path to read.
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Returns:

Returns a promise resolving to a string containing the file contents or rejecting with an error stating the failure reason.

Type
Promise.<string>

remove(The) → {Promise.<number>}

Unlink the given file.

Parameters:
Name Type Description
The string

file path to remove.
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Returns:

Returns a promise resolving to 0 or rejecting with an error stating the failure reason.

Type
Promise.<number>

stat(path) → {Promise.<LuCI.fs.FileStatEntry>}

Return file stat information on the specified path.

Parameters:
Name Type Description
path string

The filesystem path to stat.
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Returns:

Returns a promise resolving to a stat detail object or rejecting with an error stating the failure reason.

Type
Promise.<LuCI.fs.FileStatEntry>

trimmed(path) → {Promise.<string>}

Read the contents of the given file, trim leading and trailing white space and return the trimmed result. In case of errors, return an empty string instead.

Note: this function is useful to read single-value files in /sys or /proc.

This function is guaranteed to not reject its promises, on failure, an empty string will be returned.

Parameters:
Name Type Description
path string

The file path to read.
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Returns:

Returns a promise resolving to the file contents or the empty string on failure.

Type
Promise.<string>

write(path, dataopt, modeopt) → {Promise.<number>}

Write the given data to the specified file path. If the specified file path does not exist, it will be created, given sufficient permissions.

Note: data will be converted to a string using String(data) or to '' when it is null.

Parameters:
Name Type Attributes Description
path string

The file path to write to.
data * <optional>

The file data to write. If it is null, it will be set to an empty string.
mode number <optional>

The permissions to use on file creation. Default is 420 (0644).
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Returns:

Returns a promise resolving to 0 or rejecting with an error stating the failure reason.

Type
Promise.<number>

Type Definitions

FileExecResult

Type:
  • Object
Properties:
Name Type Attributes Description
code number

The exit code of the invoked command
stdout string <optional>

The stdout produced by the command, if any
stderr string <optional>

The stderr produced by the command, if any
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FileStatEntry

Type:
  • Object
Properties:
Name Type Description
name string

Name of the directory entry
type string

Type of the entry, one of block, char, directory, fifo, symlink, file, socket or unknown
size number

Size in bytes
mode number

Access permissions
atime number

Last access time in seconds since epoch
mtime number

Last modification time in seconds since epoch
ctime number

Last change time in seconds since epoch
inode number

Inode number
uid number

Numeric owner id
gid number

Numeric group id
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