[Bug 2035387] Re: Please re-enable sync of libnginx-mod-http-lua

[Bryce Harrington]

** Description changed:

- The sync-blacklist should drop the blacklisting of libnginx-mod-http-
+ The sync-blocklist should drop the blacklisting of libnginx-mod-http-
  lua, and by extension lua-resty-core.
  
  Specifically, these lines can be dropped now:
  
      # vorlon, 2022-08-17, not supportable due to Lua versioning; LP: #1986853
      libnginx-mod-http-lua
      # vorlon, 2023-07-03, depends on nginx-lua; LP: #2025072
      lua-resty-core
  
  See https://git.launchpad.net/~ubuntu-archive/+git/sync-
- blacklist/tree/sync-blacklist.txt
+ blocklist/tree/sync-blocklist.txt
  
  [Rationale]
  lua is an important programming language that nginx users would like to have available for use in website and web application development, however it currently is available for Debian but not Ubuntu.  It is actively supported upstream and thus limits Ubuntu users ability to rely on Ubuntu for their needs.
  
  [Background]
  Historically, lua support was dropped from the nginx server's source package due to dependency complications (See LP: #1986853).  Most notably, the module has a strong interdependence on lua-resty-core (See LP: #2025072), which is a large software package in universe that we do not wish to maintain in main.  A second factor was that it tended to require the latest version of lua, yet Ubuntu targeted older versions of lua due to version dependencies from various main packages such as Apache2, Dovecot, etc. (See LP: #1893753).
  
  Notably, though, with nginx 1.22 Debian re-engineered their packaging of
  the nginx server to move its modules out into source packages of their
  own.  This resolved the first issue by allowing modules to reside in
  universe and depend on things (like lua-resty-core) that are themselves
  only available from universe.  This puts us in a better, more flexible
  situation for handling nginx/lua issues in the future, since they can be
  localized to this universe package.
  
  The second issue of Lua version dependence has been resolved just
  recently in Ubuntu mantic (23.10) by MIRing lua5.4.  (See LP: #2026608)
  Note that the version skew situation could arise again with future
  versions of lua, however at least presently the situation is stabilized,
  and we can cross that bridge when we come to it.
  
  A small but complicating factor is that the aforementioned
- interdependence with lua-resty-core has led also to the sync-blacklist
+ interdependence with lua-resty-core has led also to the sync-blocklist
  of that package (LP: #2025072) since it could be built not not installed
  without the nginx module.  At the time that was handled the
  interdependence was only between these two packages, none others seem
  involved.  So, to reverse this, perhaps lua-resty-core can be sync'd
  first and allowed to re-block in migration, then sync libnginx-mod-http-
  lua and allow it to build against lua-resty-core, and then trigger both
  packages together.

** Description changed:

- The sync-blocklist should drop the blacklisting of libnginx-mod-http-
- lua, and by extension lua-resty-core.
+ The sync-blocklist should drop libnginx-mod-http-lua, and by extension
+ lua-resty-core.
  
  Specifically, these lines can be dropped now:
  
      # vorlon, 2022-08-17, not supportable due to Lua versioning; LP: #1986853
      libnginx-mod-http-lua
      # vorlon, 2023-07-03, depends on nginx-lua; LP: #2025072
      lua-resty-core
  
  See https://git.launchpad.net/~ubuntu-archive/+git/sync-
  blocklist/tree/sync-blocklist.txt
  
  [Rationale]
  lua is an important programming language that nginx users would like to have available for use in website and web application development, however it currently is available for Debian but not Ubuntu.  It is actively supported upstream and thus limits Ubuntu users ability to rely on Ubuntu for their needs.
  
  [Background]
  Historically, lua support was dropped from the nginx server's source package due to dependency complications (See LP: #1986853).  Most notably, the module has a strong interdependence on lua-resty-core (See LP: #2025072), which is a large software package in universe that we do not wish to maintain in main.  A second factor was that it tended to require the latest version of lua, yet Ubuntu targeted older versions of lua due to version dependencies from various main packages such as Apache2, Dovecot, etc. (See LP: #1893753).
  
  Notably, though, with nginx 1.22 Debian re-engineered their packaging of
  the nginx server to move its modules out into source packages of their
  own.  This resolved the first issue by allowing modules to reside in
  universe and depend on things (like lua-resty-core) that are themselves
  only available from universe.  This puts us in a better, more flexible
  situation for handling nginx/lua issues in the future, since they can be
  localized to this universe package.
  
  The second issue of Lua version dependence has been resolved just
  recently in Ubuntu mantic (23.10) by MIRing lua5.4.  (See LP: #2026608)
  Note that the version skew situation could arise again with future
  versions of lua, however at least presently the situation is stabilized,
  and we can cross that bridge when we come to it.
  
  A small but complicating factor is that the aforementioned
  interdependence with lua-resty-core has led also to the sync-blocklist
  of that package (LP: #2025072) since it could be built not not installed
  without the nginx module.  At the time that was handled the
  interdependence was only between these two packages, none others seem
  involved.  So, to reverse this, perhaps lua-resty-core can be sync'd
  first and allowed to re-block in migration, then sync libnginx-mod-http-
  lua and allow it to build against lua-resty-core, and then trigger both
  packages together.

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Title:
  Please re-enable sync of libnginx-mod-http-lua

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