Unable to pipe Bash output to other programs #8

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1. Sarah Cooley (scooley)

   assigned

   Russ Alexander (russalex)

   on Apr 6, 2016
2. justinhixson commented on Apr 7, 2016

   

   justinhixson

   on Apr 7, 2016

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   This is actually a pretty interesting one. in Python, for example, I can spawn bash just fine with the subprocess module, but only under certain circumstances. consider the following script:

   import subprocess
   subprocess.run(["bash","-c","ls"])
   

   this is saved as bash.py

   c:\>python bash.py works

   c:\>python
   >>import subprocess;
   >>subprocess.run(["bash","-c","ls"])
   

   also works

   however, I found it very interesting that

   C:\>echo import subprocess; subprocess.run(["bash","-c","ls"]); | python 
   

   does NOT work. same Error: 0x80070057

   (note that something like

   C:\>echo import subprocess; subprocess.run(["notepad"]); | python
   

   does indeed work.)

   I was using python 3.5 for these tests.

   I am sure that it is much more complicated than this, but bash.exe seems to be really, really offended by stream redirection with pipes. that doesn't clearly explain why OP is having a problem with node.js, but note that this is exactly the same error that you would get if you ever try to pipe something into bash.exe at all. for instance:

   C:\Users\Justin>type rocks.sh
   #!/bin/bash
   echo "bash on Windows ????!" | sed 's/????/rocks/g'
   
   C:\Users\Justin>bash rocks.sh
   bash on Windows rocks!
   
   C:\Users\Justin>type rocks.sh | bash
   Error: 0x80070057
   
   C:\Users\Justin>type rocks.sh | bash -c "sh"
   Error: 0x80070057
   
   C:\Users\Justin>bash -c "sh"
   # rocks.sh
   bash on Windows rocks!
   # exit
   
   C:\Users\Justin>bash -c "sh" < rocks.sh
   Error: 0x80070057
   
   C:\Users\Justin>echo "./rocks.sh" | bash -c "sh"
   Error: 0x80070057
   
3. RaeesBhatti commented on Apr 7, 2016

   

   Raees (RaeesBhatti)

   on Apr 7, 2016

   Author

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   Can confirm. This is a problem with bash having problems with output piping. If I specify { stdio: 'inhert' }, it works but that way I then have no way of getting that data. { stdio: 'pipe' } produces the error above
4. Raees (RaeesBhatti)

   changed the title [-]Unable to spawn Bash from other programs[/-] [+]Unable to pipe Bash output to other programs[/+] on Apr 7, 2016
5. MadcowD commented on May 1, 2016

   

   William Guss (MadcowD)

   on May 1, 2016

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   I've made a related issue in Bash on Windows. #312
6. Rich Turner (bitcrazed)

   unassigned

   Russ Alexander (russalex)

   on Jun 16, 2017
7. bitcrazed commented on Jun 22, 2017

   

   Rich Turner (bitcrazed)

   on Jun 22, 2017

   Contributor

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   Thanks for the issue report - this was fixed in Creators Update.

   ❤️React with ❤️1Reacted by justinhixson
8. Rich Turner (bitcrazed)

   closed this as completedon Jun 22, 2017
9. justinhixson commented on Jun 23, 2017

   

   justinhixson

   on Jun 23, 2017

   Last edited by justinhixson

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   Thank you so much for this! This has been my most anticipated feature for the Linux Subsystem since i first heard about it. I am enjoying it immensely, and can confirm that it now works exactly as one would imagine it would. Thanks again!!!!!