Fix variable names with modname in module Makefile

[simayosi]

Proposed changes

In Makefile.module-*, variable names should use underscores (_) instead of dashes (-) in module names.
This convention is followed in code such as alpine/Makefile:114 and debian/Makefile:116.
For example, the version variable for the headers-more module in Makefile.headers-more is defined asMODULE_VERSION_headers_more.

However, build_module.sh currently generates Makefile.module-$MODULE_NAME using the module name as-is in variable names, without converting dashes to underscores.
As a result, modules with dashes in their names cannot be built correctly.

This patch addresses the issue by ensuring that module names used in variable names have dashes replaced with underscores.

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[thresheek]

Hello @simayosi !

Can you please describe the issue with build_module.sh you're trying to fix?

Since I've just tried ./build_module.sh -n headers-more https://github.com/openresty/headers-more-nginx-module/archive/refs/tags/v0.38.tar.gz and on my Ubuntu machine it happily built the resulting packages with the dashes removed:

$ ls -1 build-module-artifacts/
nginx-module-headersmore-dbg_1.27.5+1.0-1~noble_arm64.deb
nginx-module-headersmore_1.27.5+1.0-1~noble_arm64.deb

Which is probably less than optimal, but is already used in leaf projects like docker-nginx, where we expect the dashes to be removed too: https://github.com/nginx/docker-nginx/blob/6b055c471a6619d4c81671e682a6d6affe0cf9c0/modules/Dockerfile#L56

Thank you!

[simayosi]

Hi @thresheek,

Thanks for your comment and for testing on Ubuntu.
Apologies, I should have included the environment where I hit the problem.
The issue I encountered happens specifically on Alpine Linux.

Your test prompted me to re-examine the build_module.sh script more closely to understand why it failed on Alpine.
After that re-check, I found that the actual source of the problem on Alpine lies in line 238 of the script.
The problem is caused by a difference in the tr implementation on Alpine Linux (BusyBox tr) compared to GNU tr.

First, both GNU tr and POSIX tr treat 'm-n' (without within []) as the characters from m through n.
Next, although both the GNU tr manpage and POSIX tr specification do not specify the behavior for unrecognized backslash escape sequences, GNU tr treats \- and \. as - and . respectively, while Alpine's tr treats \-\. as characters from \ to \, i.e., \ only, and ..

Consequently, to ensure this module name cleaning step works consistently across different systems, the line should be the following:

MODULE_NAME_CLEAN=`echo $MODULE_NAME | tr 'A-Z' 'a-z' | tr '/_.\t -' '[\n*]' | grep -ve nginx | tr -d '\n'`

However, in all of the module Makefiles included in this repository for modules with - in their name, variable names are defined with replacing dashes with underscores in their module names.
Therefore, I propose that build_module.sh leaves dashes in MODULE_NAME_CLEAN as is as the following and converts dashes to underscores in creating module Makefile by applying my patch.

MODULE_NAME_CLEAN=`echo $MODULE_NAME | tr 'A-Z' 'a-z' | tr '/_.\t ' '[\n*]' | grep -ve nginx | tr -d '\n'`

Thank you!

[simayosi]

I've added a follow-up commit to fix MODULE_NAME_CLEAN. This commit, along with my previous one, addresses the issue based on my proposal.
I tested this fix using Dockerfiles for Alpine and Debian, based on the official Nginx images.