diff options
Diffstat (limited to 'src/Propellor/Message.hs')
| -rw-r--r-- | src/Propellor/Message.hs | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/Propellor/Message.hs b/src/Propellor/Message.hs index 4be8263e..3792129b 100644 --- a/src/Propellor/Message.hs +++ b/src/Propellor/Message.hs @@ -238,22 +238,22 @@ messagesDone = lockOutput $ do setTitle "propellor: done" hFlush stdout --- | Wrapper around `System.Process.createProcess` that prevents processes --- that are running concurrently from writing to the stdout/stderr at the --- same time. +-- | Wrapper around `System.Process.createProcess` that prevents +-- multiple processes that are running concurrently from writing +-- to stdout/stderr at the same time. -- --- The first process run by createProcess is allowed to write to +-- The first process is allowed to write to -- stdout and stderr in the usual way. -- --- However, if a second createProcess runs concurrently with the +-- However, if another process runs concurrently with the -- first, any stdout or stderr that would have been displayed by it is -- instead buffered. The buffered output will be displayed the next time it -- is safe to do so (ie, after the first process exits). -- --- `Propellor.Property.Cmd` has some other useful actions for running --- commands, which are based on this. --- -- Also does debug logging of all commands run. +-- +-- Unless you manually import System.Process, every part of propellor +-- that runs a process uses this. createProcessConcurrent :: P.CreateProcess -> IO (Maybe Handle, Maybe Handle, Maybe Handle, P.ProcessHandle) createProcessConcurrent p | hasoutput (P.std_out p) || hasoutput (P.std_err p) = |