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| 18:39:00 | <landakram> | Hi there, I just switched to xmonad. Things are working well, but I'm having a problem with recompile. Recompiling with "M-q" does not work. When I look at `xsession-errors`, I see the following: |
| 18:39:00 | <landakram> | ``` |
| 18:39:01 | <landakram> | XMonad will use stack ghc --stack-yaml "/home/user/.config/xmonad/stack.yaml" to recompile. |
| 18:39:01 | <landakram> | XMonad recompiling (forced). |
| 18:39:02 | <landakram> | xmonad: /home/user/.local/share/xmonad/xmonad.errors: withFile: does not exist (No such file or directory) |
| 18:39:02 | <landakram> | ``` |
| 18:39:03 | <landakram> | I've tracked the error down to this line in the `compile` function in xmonad: https://github.com/xmonad/xmonad/blob/master/src/XMonad/Core.hs#L653-L663 |
| 18:39:03 | <landakram> | The errFileName "xmonad.errors" *does* exist and in fact has the first build command written to it. It appears to fail when writing the second build command (`stack gch stack.yaml ...`) |
| 18:39:04 | <landakram> | Strangely, running `xmonad --recompile` in a shell works fine. |
| 18:39:04 | <landakram> | Does anyone have any ideas about what might be happening? |
| 18:53:25 | <geekosaur> | hm. looks fine to me. liskin? git blame says you last touched that code |
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| 19:02:47 | <liskin> | landakram: but that withFile is around both commands, how can it fail in the middle? |
| 19:03:30 | <landakram> | I'm not sure... maybe on the hFlush? |
| 19:07:46 | <geekosaur> | I don't think that would have the filename; the original withFile would have to be what was failing |
| 19:08:08 | <geekosaur> | note that the "XMonad recompiling (forced) is form tracem not withFile |
| 19:08:14 | <geekosaur> | *from trace, not |
| 19:09:13 | <geekosaur> | the handle opened by withFile is only used for the `ghc`/`stack ghc`/`build` actions |
| 19:10:26 | <geekosaur> | oh, I see, right, two actions there |
| 19:11:54 | <geekosaur> | the other oddity is that it should create xmonad.errors if it doesn't exist, so the error implies the directory containing it doesn't exist |
| 19:24:59 | <geekosaur> | landakram, are you looking at the beginning or the end of .xsession-errors? That file usually gets appended to, whereas xmonad.errors is recreated each time |
| 19:38:25 | <landakram> | I'm tailing xsession-errors, so it's the output that is appended when I run "M-q". I even tried removing xmonad.errors before running, and I observed that the file gets recreated and the first command is written to it |
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| 20:09:22 | <landakram> | I'm running on HEAD of master btw. Let me try the latest tagged version and report back |
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| 20:10:01 | <geekosaur> | pretty sure there are no changes in master |
| 20:10:13 | <geekosaur> | the core doesn't change very often |
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| 22:05:31 | <landakram> | unfortunately, as expected, using the tagged version 0.17.1 makes no difference. So strange... |
| 22:16:24 | <geekosaur> | hm. so it might actually be the hFlush after all: withFile gets recorded as the origin of the Handle |
| 22:16:40 | <geekosaur> | wish it'd actually say it's the flush in that case though |
| 22:16:46 | geekosaur | still digging |
| 22:18:21 | <geekosaur> | but hFlush can't throw that error. it can throw a permission error but not DoesNotExistError |
| 22:22:30 | <geekosaur> | and withFile can't throw after outputting that first line |
| 22:45:43 | <landakram> | I added in some calls to `hPutStrLn` and `hFlush` to try and debug further (recompiled using a shell). It looks like my logs after `createProcess_` don't get flushed, but the ones before that do. This makes me think the handle is being closed with that call, but the docs explicitly state that it shouldn't be... perhaps the `stack build --silent |
| 22:45:43 | <landakram> | ...` command is failing for some reason, and so the handle is being closed prematurely |
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| 22:54:45 | <geekosaur> | but if it were, why would it work from a shell? |
| 22:58:19 | <landakram> | haha i dunno :P |
| 23:00:45 | <geekosaur> | code matches the description, but we're using createProcess_ so it should be fine |
| 23:01:10 | <geekosaur> | also, handle closed throws a different error |
| 23:02:22 | <geekosaur> | also note that anything written after createProcess_ but before waitForProcess will be overwritten by the child |
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All times are in UTC on 2022-12-22.