forked from zhurui/management
77 lines
2.3 KiB
Markdown
77 lines
2.3 KiB
Markdown
Like FS streams, but with stat on them, and supporting directories and
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symbolic links, as well as normal files. Also, you can use this to set
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the stats on a file, even if you don't change its contents, or to create
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a symlink, etc.
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So, for example, you can "write" a directory, and it'll call `mkdir`. You
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can specify a uid and gid, and it'll call `chown`. You can specify a
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`mtime` and `atime`, and it'll call `utimes`. You can call it a symlink
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and provide a `linkpath` and it'll call `symlink`.
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Note that it won't automatically resolve symbolic links. So, if you
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call `fstream.Reader('/some/symlink')` then you'll get an object
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that stats and then ends immediately (since it has no data). To follow
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symbolic links, do this: `fstream.Reader({path:'/some/symlink', follow:
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true })`.
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There are various checks to make sure that the bytes emitted are the
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same as the intended size, if the size is set.
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## Examples
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```javascript
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fstream
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.Writer({ path: "path/to/file"
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, mode: 0755
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, size: 6
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})
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.write("hello\n")
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.end()
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```
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This will create the directories if they're missing, and then write
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`hello\n` into the file, chmod it to 0755, and assert that 6 bytes have
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been written when it's done.
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```javascript
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fstream
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.Writer({ path: "path/to/file"
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, mode: 0755
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, size: 6
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, flags: "a"
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})
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.write("hello\n")
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.end()
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```
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You can pass flags in, if you want to append to a file.
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```javascript
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fstream
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.Writer({ path: "path/to/symlink"
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, linkpath: "./file"
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, SymbolicLink: true
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, mode: "0755" // octal strings supported
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})
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.end()
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```
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If isSymbolicLink is a function, it'll be called, and if it returns
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true, then it'll treat it as a symlink. If it's not a function, then
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any truish value will make a symlink, or you can set `type:
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'SymbolicLink'`, which does the same thing.
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Note that the linkpath is relative to the symbolic link location, not
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the parent dir or cwd.
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```javascript
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fstream
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.Reader("path/to/dir")
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.pipe(fstream.Writer("path/to/other/dir"))
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```
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This will do like `cp -Rp path/to/dir path/to/other/dir`. If the other
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dir exists and isn't a directory, then it'll emit an error. It'll also
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set the uid, gid, mode, etc. to be identical. In this way, it's more
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like `rsync -a` than simply a copy.
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