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View Code? Open in Web Editor NEWhaskell library to work with linux namespaces
Home Page: https://hackage.haskell.org/package/linux-namespaces
License: BSD 3-Clause "New" or "Revised" License
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fails to build with ghc-9.6
Building library for linux-namespaces-0.1.3.0.. [380/157737]
[1 of 1] Compiling System.Linux.Namespaces
/var/stackage/work/unpack-dir/unpacked/linux-namespaces-0.1.3.0-89f763235d0c9593cd8f6bdea2b8d38cc7d40118e498822417aa8a7d862e6
20c/System/Linux/Namespaces.hsc:133:9: error: [GHC-83865]
• Couldn't match expected type: OpenFileFlags -> IO r
with actual type: IO Fd
• The function ‘openFd’ is applied to four value arguments,
but its type ‘FilePath -> OpenMode -> OpenFileFlags -> IO Fd’
has only three
In the second argument of ‘($)’, namely
‘openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}’
In the expression:
ioeSetLoc "enterNamespace"
$ openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}
• Relevant bindings include
openFd' :: IO r (bound at System/Linux/Namespaces.hsc:132:5)
|
133 | openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/var/stackage/work/unpack-dir/unpacked/linux-namespaces-0.1.3.0-89f763235d0c9593cd8f6bdea2b8d38cc7d40118e498822417aa8a7d862e6
20c/System/Linux/Namespaces.hsc:133:30: error: [GHC-83865]
• Couldn't match expected type ‘OpenFileFlags’
with actual type ‘Maybe a1’
• In the third argument of ‘openFd’, namely ‘Nothing’
In the second argument of ‘($)’, namely
‘openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}’
In the expression:
ioeSetLoc "enterNamespace"
$ openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}
|
133 | openFd path ReadOnly Nothing defaultFileFlags {nonBlock = True}
| ^^^^^^^
/var/stackage/work/unpack-dir/unpacked/linux-namespaces-0.1.3.0-89f763235d0c9593cd8f6bdea2b8d38cc7d40118e498822417aa8a7d862e6
20c/System/Linux/Namespaces.hsc:218:14: error: [GHC-83865]
• Couldn't match expected type: OpenFileFlags -> IO Fd
with actual type: IO Fd
• The function ‘openFd’ is applied to four value arguments,
but its type ‘FilePath -> OpenMode -> OpenFileFlags -> IO Fd’
has only three
RTS ticker thread can cause trouble
Recently I found that a testsuite using this package started failing with unshare: invalid argument but I wasn't sure what was going on as command line unshare worked just fine. Comparing both calls I didn't see much difference but then stumbled on clone3 call done by GHC forking a process called ghc_ticker. The use of ticker seems to depend on compile time options and availability of packages during GHC build.
Some more info https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/rts/signals#the-rts-timer-signal
This started manifesting in CI which used latest Ubuntu and on NixOS as well.
The fix is to disable the timer with
ghc-options: -rtsopts "-with-rtsopts -V0"
From help:
hnix-store-remote-tests: -V<secs> Master tick interval in seconds (0 == disable timer).
hnix-store-remote-tests: This sets the resolution for -C and the heap profile timer -i,
hnix-store-remote-tests: and is the frequency of time profile samples.
hnix-store-remote-tests: Default: 0.01 sec.
Should we add this to the comments (or README) that already mention issues with -threaded?
During the debugging I've also extracted the example to separate cabal executable - want a PR? I can also PR a simple testsuite + CI if you want.
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