Error deleting file *.lock

[NIFR91]

Description

I want to process some text stream with my program (the same program) as in :

echo "hello\nworld\n" | ./myprog.cr  process-lines | ./myprog.cr  process-columns

When using the crystal compiler like in #! usr/bin/env crystal I got an error so following a issue
I found crun. From the description I think it should handle my case but when using it
I found the following error :

Unhandled exception: Error deleting file '/home/ nieto/.cache/crun/writter.crystal.lock': No such file or directory (Errno)
Failed to raise an exception: END_OF_STACK
[0x55c92d246da6] ???
[0x55c92d201afb] __crystal_raise +43
[0x55c92d202af5] ???
[0x55c92d20b131] ???
[0x55c92d2067ac] ???
[0x55c92d205bff] ???
[0x55c92d21f46d] ???
[0x55c92d21d9a5] ???
[0x55c92d20429a] main +74
[0x7f8f791e309b] __libc_start_main +235
[0x55c92d20087a] _start +42
[0x0] ???

minimal program

#!/usr/bin/env crun

while line = gets 
  puts line
end 

or

#!/usr/bin/env crun 
sleep 1

[Val]

Like crystal-lang/crystal#8340

[bew]

Yes @Val but iirc the lock file is generated by crun in this case, no?

[Val]

This issue is very interesting and reveal some race conditions

1. crun/src/lock.cr

   Line 20 in 20bbbb0

   File.delete(lockfile.path)

   with a possible workarround

2. crun/src/shards.cr

   Lines 22 to 31 in 94c7c85

   	File.open(shards_config_path, "w") do |file|
   	file.puts <<-EOYAML
   	---
   	name: #{SOURCE_FILENAME}
   	version: 0.1.0
   	dependencies:
   	#{shards_yaml}
   	...
   	EOYAML
   	end

   with another possible workarround

But I added some pipe samples specifications and it still fail, see lock_deletion_race_condition_fix branch. And some times you get an error like for crystal-lang/crystal#8075 or crystal-lang/crystal#7810

> make tests
crystal tool format -i src -i spec
crun format passed
rm -f crun crun.sha256
crun clean passed
crystal build src/main.cr -o crun --warnings all --error-on-warnings --error-trace
crun build passed
crystal spec --debug --warnings all --error-on-warnings --error-trace
.....error:
Failed to raise an exception: END_OF_STACK
[0x56511fbb0e76] *CallStack::print_backtrace:Int32 +118
[0x56511fb93006] __crystal_raise +86
[0x56511fb9352e] ???
[0x56511fbe0966] *Crystal::System::File::open<String, String, File::Permissions>:Int32 +214
[0x56511fbd9c83] *File::new<String, String, File::Permissions, Nil, Nil>:File +67
[0x56511fba7b1d] *CallStack::read_dwarf_sections:(Array(Tuple(UInt64, UInt64, String)) | Nil) +109
[0x56511fba78ad] *CallStack::decode_line_number<UInt64>:Tuple(String, Int32, Int32) +45
[0x56511fba7038] *CallStack#decode_backtrace:Array(String) +296
[0x56511fba6ef2] *CallStack#printable_backtrace:Array(String) +50
[0x56511fc1560d] *Exception+ +77
[0x56511fc15458] *Exception+ +120
[0x56511fc115da] *AtExitHandlers::run<Int32>:Int32 +490
[0x56511fc514ab] *Crystal::main<Int32, Pointer(Pointer(UInt8))>:Int32 +139
[0x56511fb9da16] main +6
[0x7f988572d09b] __libc_start_main +235
[0x56511fb9188a] _start +42
[0x0] ???
Crun::BuildError: Build failed: crystal build --debug --error-on-warnings --error-trace -o /tmp/.lgmAAIcrun_spec_local_cache/foo__path_to_crystal_crun_spec_samples_pipe_echo_cr/echo.cr.crystal /path/to/crun/spec/samples/pipe/echo.cr

STDOUT:


STDERR:
In /path/to/crun/spec/samples/pipe/echo.cr:1:1

 1 | while line = gets
     ^
Error: can't find file 'prelude'

If you're trying to require a shard:
- Did you remember to run `shards install`?
- Did you make sure you're running the compiler in the same directory as your shard.yml?