The atomic-write package
Atomically write to a file on POSIX-compliant systems while preserving permissions.
On most Unix systems, mv is an atomic operation. This makes it simple to write to a file atomically just by using the mv operation. However, this will destroy the permissions on the original file. This library does the following to preserve permissions while atomically writing to a file:
If an original file exists, take those permissions and apply them to the temp file before mving the file into place.
If the original file does not exist, create a following with default permissions (based on the currently-active umask).
This way, when the file is mv'ed into place, the permissions will be the ones held by the original file.
This library is based on similar implementations found in common libraries in Ruby and Python:
To use atomic-write, import the module corresponding to the type you wish to write atomically, e.g., to write a (strict) ByteString atomically:
Then you can use the atomicWrite function that accepts a FilePath and a ByteString, e.g.:
atomicWrite myFilePath myByteString
|Versions||0.1.0.0, 0.1.0.1, 0.2.0.0, 0.2.0.1, 0.2.0.2, 0.2.0.3, 0.2.0.4, 0.2.0.5|
|Dependencies||base (>=4.5 && <5.0), bytestring (>=0.10.4), directory, filepath, temporary, text, unix-compat [details]|
|Copyright||2015 Stack Builders Inc.|
|Source repository||head: git clone firstname.lastname@example.org:stackbuilders/atomic-write.git|
|Uploaded||Tue May 17 13:43:17 UTC 2016 by jsl|
|Distributions||LTSHaskell:0.2.0.5, NixOS:0.2.0.5, Stackage:0.2.0.5, Tumbleweed:0.2.0.5|
|Downloads||1100 total (19 in the last 30 days)|
|Status||Docs available [build log]
Last success reported on 2016-05-17 [all 1 reports]
For package maintainers and hackage trustees