Update install-sh

[stratakis]

BPO	34765
Nosy	@vstinner, @zware, @aixtools, @stratakis
PRs	bpo-34765: Update the install-sh file. #9592 bpo-34765: install-sh is executable #10225

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-10-29.20:43:37.885>
created_at = <Date 2018-09-21.15:47:07.535>
labels = ['build', '3.8']
title = 'Update install-sh'
updated_at = <Date 2018-10-30.06:00:07.576>
user = 'https://github.com/stratakis'

bugs.python.org fields:

activity = <Date 2018-10-30.06:00:07.576>
actor = 'Michael.Felt'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-29.20:43:37.885>
closer = 'vstinner'
components = ['Build']
creation = <Date 2018-09-21.15:47:07.535>
creator = 'cstratak'
dependencies = []
files = []
hgrepos = []
issue_num = 34765
keywords = ['patch']
message_count = 12.0
messages = ['325996', '325998', '327947', '327948', '328444', '328445', '328447', '328853', '328862', '328867', '328868', '328883']
nosy_count = 4.0
nosy_names = ['vstinner', 'zach.ware', 'Michael.Felt', 'cstratak']
pr_nums = ['9592', '10225']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34765'
versions = ['Python 3.8']

[stratakis]

The install-sh file that python uses for autotools is horribly outdated. Last update was 16 years ago and it's being copied from automake's source code.

Updating it to modern standards could potentially fix issues for systems that use autotools, but it has the downside of having some backwards incompatible changes e.g. [0][1] (or you can search at their NEWS file [2]) which could break some previous applied workarounds.

As things stand, there is no bug at the moment and autotools just work so would a PR for updating install-sh to a newer version be considered?

[0] http://git.savannah.gnu.org/cgit/automake.git/commit/lib/install-sh?id=84a98180dd37a32891800fb9aafdf685bab74252
[1] http://git.savannah.gnu.org/cgit/automake.git/commit/lib/install-sh?id=bd44db1abdeea3643ba0387de24af7539da644e4
[2] http://git.savannah.gnu.org/cgit/automake.git/tree/NEWS

[zware]

If there's no actual bug, it certainly does not need to be done on maintenance branches.

[vstinner]

New changeset b7ad31c by Victor Stinner (stratakis) in branch 'master':
bpo-34765: Update the install-sh file (GH-9592)
b7ad31c

[vstinner]

Thanks Charalampos Stratakis for the change!

If there's no actual bug, it certainly does not need to be done on maintenance branches.

I concur. Since install-sh has been updated in the master branch, I close the issue.

[stratakis]

Adding to this, the reason I initially caught up with that, was due to a coverity scan.

More explicitly:

Error: SHELLCHECK_WARNING: [#def1]
/usr/lib64/python3.6/config-3.6dm-x86_64-linux-gnu/install-sh:63:1: warning: transform_arg appears unused. Verify it or export it. [SC2034]
# 61|
# 62| transformbasename=""
# 63|-> transform_arg=""
# 64| instcmd="$mvprog"
# 65| chmodcmd="$chmodprog 0755"

Error: SHELLCHECK_WARNING: [#def2]
/usr/lib64/python3.6/config-3.6m-x86_64-linux-gnu/install-sh:63:1: warning: transform_arg appears unused. Verify it or export it. [SC2034]
# 61|
# 62| transformbasename=""
# 63|-> transform_arg=""
# 64| instcmd="$mvprog"
# 65| chmodcmd="$chmodprog 0755"

So the transform_arg is unused, but I'm not well versed with autotools so I don't know the implications of that.

[stratakis]

Generic reference on the issue:

https://github.com/koalaman/shellcheck/wiki/SC2034

[stratakis]

Alright the static scanner warns in the case of a typo being made where the variable is actually used, but since the variable is indeed not used, that doesn't not make it a bug.

[aixtools]

This is closed, however, since this was merged the AIX buildbots have failed. This is because the file mode bits lack the -x

root@x066:[/data/prj/python/git/cpython-master]find . -name install-sh -ls
148833829 16 -rw-r--r-- 1 root felt 15368 Oct 29 17:34 ./install-sh

Can this be fixed as part of this issue, or do I need to open a new one?

Currently both AIX build-bots fail in the build phase with:

renaming build/scripts-3.8/pydoc3 to build/scripts-3.8/pydoc3.8
renaming build/scripts-3.8/idle3 to build/scripts-3.8/idle3.8
renaming build/scripts-3.8/2to3 to build/scripts-3.8/2to3-3.8
./install-sh -c -m 644 ./Tools/gdb/libpython.py python-gdb.py
./install-sh: not found

[aixtools]

FYI: On my manual build server I have coreutils "install" installed, and it seems install-sh is not called in that case (which is why I never saw with manual builds)

FYI: There is also an issue (I hope side-effect) that pyexpat is not building while install-sh is not executing.

I see the new PR - thx for the quick response!