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unix: fix grep syntax to work on non-GNU greps #217

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unix: fix grep syntax to work on non-GNU greps #217

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@jtroy jtroy commented Sep 10, 2024 •
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CL 432835 changed two grep commands in unix/mkerrors.sh in such a way
that is incompatible with AIX's grep, which, unlike GNU grep, does not
support extended regular expressions without the -E flag. The intent of
this PR is to restore the egrep behavior by invoking grep as grep -E.
My assumption is that GNU grep is not meant to be a requirement to run
mkerrors.sh, and given that, grep -E looks like the most cross-platform
approach.

Example of current (incorrect) behavior on AIX:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | grep -v 'SIGSTKSIZE|SIGSTKSZ|SIGRT|SIGMAX64'
SIGHUP
SIGMAX64
SIGTERM

Behavior before CL 432835:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT|SIGMAX64)'
SIGHUP
SIGTERM

Behavior of proposed change:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | grep -E -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT|SIGMAX64)'
SIGHUP
SIGTERM

OpenBSD's grep behaves the same as AIX for the above commands, which is
why I cast this as GNU vs. non-GNU. I haven't tested any other
implementations.

Fixes golang/go#69365

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@jtroy jtroy mentioned this pull request Sep 10, 2024
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@jtroy To proceed with this pull request, you will need to sign the Google CLA. See https://go.dev/doc/contribute for more information. Thanks.

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jtroy commented Sep 25, 2024

@jtroy To proceed with this pull request, you will need to sign the Google CLA. See https://go.dev/doc/contribute for more information. Thanks.

@ianlancetaylor apologies, it's sorted now.

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gopherbot pushed a commit that referenced this pull request Sep 30, 2024
@jtroy @gopherbot
unix: fix grep syntax to work on non-GNU greps
cbf0eb6 
CL 432835 changed two grep commands in unix/mkerrors.sh in such a way
that is incompatible with AIX's grep, which, unlike GNU grep, does not
support extended regular expressions without the -E flag. The intent of
this PR is to restore the egrep behavior by invoking grep as grep -E.
My assumption is that GNU grep is not meant to be a requirement to run
mkerrors.sh, and given that, grep -E looks like the most cross-platform
approach.

Example of current (incorrect) behavior on AIX:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT\|SIGMAX64'
SIGHUP
SIGMAX64
SIGTERM

Behavior before CL 432835:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT|SIGMAX64)'
SIGHUP
SIGTERM

Behavior of proposed change:

bash-5.2$ printf 'SIGHUP\nSIGMAX64\nSIGTERM' | grep -E -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT|SIGMAX64)'
SIGHUP
SIGTERM

OpenBSD's grep behaves the same as AIX for the above commands, which is
why I cast this as GNU vs. non-GNU. I haven't tested any other
implementations.

Fixes golang/go#69365

Change-Id: I009353ee630463475a5c131d019f59c5e69efd34
GitHub-Last-Rev: e116604
GitHub-Pull-Request: #217
Reviewed-on: https://go-review.googlesource.com/c/sys/+/615755
Reviewed-by: Michael Knyszek <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
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This PR is being closed because golang.org/cl/615755 has been merged.

@gopherbot gopherbot closed this Sep 30, 2024
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x/sys/unix: mkerrors.sh broken on AIX
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