[Bug 2143295] Re: [FFE] Update golang-defaults to 1.26

[Utkarsh Gupta]

Hi!

1/ 1.26 is the default in Debian already, and we want to ship the latest
for the 26.04 LTS release - something that will stay for at least 15
years. This also helps in patching vulnerabilities a few years down the
line. As for improvements, there's a new GC called greentea which can
improve performance by upto 40% and there's also reduced overhead for
cgo calls. Our builds in the archive will benefit from the improved
performance.

2/ That has now been updated to mention that _new_ packages will pick up
1.26 as Go is statically compiled. We're not planning a mass rebuild. Go
1.26 is pretty much backward compatible with 1.24/1.25 - which has
already received a mass rebuild (thanks to Debcrafters :)). We've done a
mass rebuild of 1.26 in a PPA, and we have about 50 package failures. We
plan to remove a few things that have been FTBFS'ing since Noble and fix
the remaining ones.

3/ Apologies - by that, Anshul meant the 50 packages that we have to
either remove or upload a fix for.


Hope that clears things up a bit. Let me know if you need any other details.

** Changed in: golang-defaults (Ubuntu)
       Status: Incomplete => New

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Title:
  [FFE] Update golang-defaults to 1.26

Status in golang-defaults package in Ubuntu:
  New

Bug description:
  ## FFE ##

  =========
  Rationale
  =========
  This is a Feature Freeze Exception request to update `golang-defaults` from 1.25 to 1.26 in Resolute Raccoon.
  golang-defaults in Ubuntu currently points to Go 1.25. Debian unstable uses Go 1.26 as its Go version.

  This update is necessary because the newer version contains a lot of
  performance and security updates which our archive will benefit from.
  The changelog for this version can be found at
  https://go.dev/doc/go1.26.

  Upgrading the default Go compiler now ensures that any new builds in
  the Resolute archive are built against a fully supported, secure, and
  modern Go toolchain for the lifetime of the 26.04 LTS release.

  ================
  Proposed Changes
  ================
  - golang-defaults now points to golang-1.26 instead of golang-1.25, meaning
    that future package builds will use Go 1.26 instead of 1.25.
    * The upstream Go team maintains a strict policy of backwards
      compatibility, meaning that any future rebuilds of packages are
      expected to work without issue.

  ================
  seeded-in-ubuntu
  ================
  $ seeded-in-ubuntu golang-defaults
  golang-defaults's binaries are not seeded.

  ==========
  PPA builds
  ==========
  The package builds for all architectures in a PPA:
  https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/golang-1.26-transition/+packages?field.name_filter=golang-defaults&field.status_filter=published&field.series_filter=

  ==================
  Additional testing
  ==================
  Test rebuild of rdeps in ppa:
  https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/golang-1.26-transition/+packages

  Most of the remaining failures are either not regressions or packages
  which are to be removed from the archive.

  ==============================
  Installation and local testing
  ==============================
  root at nami:~# add-apt-repository -y ppa:ubuntu-toolchain-r/golang-1.26-transition
  [...]
  root at nami:~# apt update && apt install -y golang
  [...]
  root at nami:~# go version
  go version go1.26.0 linux/amd64
  root at nami:~# mkdir hello && cd hello
  root at nami:~/hello# go mod init hello
  go: creating new go.mod: module hello
  root at nami:~/hello# cat <<EOF > main.go
  package main

  import "fmt"

  func main() {
      fmt.Println("Hello, world!")
  }
  EOF
  root at nami:~/hello# go run .
  Hello, world!
  root at nami:~/hello# go build .
  root at nami:~/hello# ./hello
  Hello, world!

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