pub's binstubs should set #!/bin/bash explicitly

[DartBot]

<img src="https://avatars.githubusercontent.com/u/444270?v=3" align="left" width="96" height="96"hspace="10"> Issue by seaneagan
Originally opened as dart-lang/sdk#21854

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From seaneagan/den#7:

This seems to be the culprit http://stackoverflow.com/a/17753098/217408 (/bin/sh -> dash) and dash seems not to support [[ according to the SO answer.

Do you consider changing the first line in /home/myuser/.pub-cache/bin/den to #!/bin/bash, which fixes the issue for me?

[[ is bash specific and according to http://lwn.net/Articles/343924/ the script file should set #!/bin/bash explicitly in this case. Contains some other interesting background I wasn't aware of.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Not everyone uses bash, though?

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Removed Type-Defect label.
Added Type-Enhancement, Area-Pub, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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We could also just use [ ] rather than [[ ]], right?

[DartBot]

<img src="https://avatars.githubusercontent.com/u/444270?v=3" align="left" width="48" height="48"hspace="10"> Comment by seaneagan

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They don't have to use it though, just have to have it installed, so that
the binstubs can use it.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Set owner to @nex3.
Added Started label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Fixed in dart-lang/sdk@86de424.

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Added Fixed label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/405837?v=3" align="left" width="48" height="48"hspace="10"> Comment by zoechi

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Great! Works fine now.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/444270?v=3" align="left" width="48" height="48"hspace="10"> Comment by seaneagan

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Thanks! Looks like the pub executable also uses [[, but it has #!/bin/bash. Should that be changed to be consistent with the binstubs? Not sure if the pub executable uses any other bash-specific features.

Cygwin is also not properly supported by the binstubs and the pub executable, see issue #1120. This means you have to call pub.bat or e.g. den.bat instead of just pub or den, and also that it's impossible to write shell scripts that call these executables and work cross-platform (cygwin and linux/mac).

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Thanks! Looks like the pub executable also uses [[, but it has #!/bin/bash. Should that be changed to be consistent with the binstubs? Not sure if the pub executable uses any other bash-specific features.

Feel free to file an issue for this, although it's much less urgent since it's not actually breaking anyone.

Cygwin is also not properly supported by the binstubs and the pub executable, see issue #1120.

I believe Cygwin is not an officially supported platform right now.