build: do not require the nonstandard and unpredictable 'which' utility #811
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This may not be installed on various systems, and it's difficult to test for the availability of the tool you need, if the check program itself does not exist. The POSIX 2008 specification mandates the `command -v` builtin; bash is a POSIX 2008 compliant shell, and this builtin has worked since bash 1.x anyway. A side benefit of using the POSIX portable option is that it requires neither an external disk executable, nor (because unlike "which", the exit code is reliable) a subshell fork. This therefore represents a mild speedup.
Contributor
Author
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Because I don't have |
Contributor
Author
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Totally as a side note, the script doesn't actually make use of bash-specific features, so it could be modified to run via /bin/sh; it's not the only script in that situation. |
Collaborator
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@eli-schwartz We only target to bash: https://github.com/tj/git-extras/blob/master/CONTRIBUTING.md#your-new-git-extra-command-should-support |
Contributor
Author
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Yeah, probably makes sense I suppose. I'm just a persnickety /bin/sh script writer. :D |
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This may not be installed on various systems, and it's difficult to test for the availability of the tool you need, if the check program itself does not exist.
The POSIX 2008 specification mandates the
command -vbuiltin; bash is a POSIX 2008 compliant shell, and this builtin has worked since bash 1.x anyway.A side benefit of using the POSIX portable option is that it requires neither an external disk executable, nor (because unlike "which", the exit code is reliable) a subshell fork. This therefore represents a mild speedup.