hesselink/flock

Haskell bindings to flock

flock's Issues

Inaccurate version bounds in .cabal file

Specifically, throwErrnoPathIfMinus1Retry_ wasn't exported by System.Posix.Error before unix-2.5.0.0, and compilation fails with e.g. unix-2.4.2.0:

[1 of 1] Compiling System.Lock.FLock ( dist/dist-sandbox-69b443ad/build/System/Lock/FLock.hs, dist/dist-sandbox-69b443ad/build/System/Lock/FLock.o )

System/Lock/FLock.hsc:26:38:
    Module
    `System.Posix.Error'
    does not export
    `throwErrnoPathIfMinus1Retry_'

Suggestion: Create file if it does not exist

The flock utility in the util-linux-ng, when given a file path, calls open with file mode 666 to create the file if it does not exist.

I can't think of a reason why we would not want to create the lockfile if it does not exist, and this behavior would be more consistent with user expectation (my expectation, anyway).

Can't lock directories exclusively

I tried to lock a directory exclusively using lock "/home" Exclusive Block. Unfortunately it didn't work an failed with this exception:

*** Exception: /home: openFd: inappropriate type (Is a directory)

This happens because openFd can open directories only ReadOnly. Opening directories with ReadOnly is sufficient for locking them exclusively with flock as shown with this code:

lockDirectoryExample = do
  fd <- openFd "/home" ReadOnly Nothing defaultFileFlags
  l <- lockFd fd

I guess to fix this lock would have to check if the given path is a directory and if so, open it with ReadOnly.

Flock 0.3.2 is incompatible with base 4.15

Base 4.15 came out this year, could you update flock's bound to allow for it?

The current bounds (<4.15) cause the package to fail when I use nightly stackage (ghc 9.0).

The version on hackage (0.3.1.8) doesn't compile with ghc 8.2

Looks like the bounds have been relaxed with 330ae49. It would be greate if you can update the package the hackage. Thanks !