Using powershell for downloading is broken when calling julia from inside mintty.

[twadleigh]

I am testing wrapping julia in the mintty terminal emulator for windows. In that case, using powershell for downloads in download_cmd causes a hang. Removing :powershell, it worked fine with curl for me.

[tkelman]

I'm having a hard time reproducing this.

[twadleigh]

I can't reproduce it on the loaner laptop I have right now, either. I'll try again on my work machine when I'm back in the office next week.

I'm now seeing this on my laptop. I'll try to hack up BinDeps to make things more verbose and see if I can provide some better information.

[twadleigh]

On my machine I'm able to reproduce this by:

1. deleting the usr and downloads directories under Images/deps;
2. executing Pkg.build("Images") from mintty-wrapped julia.

BinDeps hangs here while executing the command:

`powershell -Command '(new-object net.webclient).DownloadFile("http://www.imagemagick.org/download/binaries/ImageMagick-6.9.2-0-Q16-x64-dll.exe", "C:\tw\v0.4\Images\deps\downloads\ImageMagick-6.9.2-0-Q16-x64-dll.exe")'`

The download completes, but the run never returns.

[twadleigh]

I'm hoping this ends up having the same root cause as the "Ctrl+C in a subprocess kills mintty" problem, so that one fix addresses both outstanding issues.

Unfortunately, this seems to boil down to subtlies with spawn, which puts it outside of my comfort zone. I might be able to push this forward with some help, but I'm otherwise at an impasse.

[tkelman]

@twadleigh or anyone else who was able to reproduce this, can you remind me what version of Windows you were using when you saw this? The Images download presumably needs to be ImageMagick now.

edit: windows 7 according to JuliaLang/julia#7267 (comment)

[twadleigh]

Win 7

On Wed, May 4, 2016, 1:16 AM Tony Kelman [email protected] wrote:

@twadleigh https://github.com/twadleigh or anyone else who was able to
reproduce this, can you remind me what version of Windows you were using
when you saw this? The Images download presumably needs to be ImageMagick
now.

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