Makefile: Force to rebase when using make update

[sbz]

Summary

Ideally, we want to force to rebase our local tree when updating against the
remote. For example, before pushing a change, I want to ensure my remote is in
sync before using git push.

Test Plan

$ make -C /usr/ports update
--------------------------------------------------------------
>>> Updating /usr/ports from git repository
--------------------------------------------------------------
cd /usr/ports; git pull --rebase origin main
remote: Enumerating objects: 26, done.
remote: Counting objects: 100% (26/26), done.
remote: Compressing objects: 100% (25/25), done.
remote: Total 30 (delta 5), reused 1 (delta 1), pack-reused 4
Unpacking objects: 100% (30/30), 268.98 KiB | 5.38 MiB/s, done.
From https://git.freebsd.org/ports
 * branch                      main       -> FETCH_HEAD
   7e9a1a19e813..84150d84aa58  main       -> origin/main
Successfully rebased and updated refs/heads/main.

[mat]

Makefile

192

origin main is a bit too much, what if I checkout stable/13 ?

[lwhsu]

I think adding --rebase is good. We may need to check the remote and branch name because in the document we recommend set remote name as freebsd. Maybe we can use variable with default value here. (${GIT} pull --rebase ${GIT_REMOTE} ${GIT_BRANCH}).

[sbz]

Maybe we can get the current remote and branch using the something like, I'll test that:

GIT_REMOTE=$(git remote)
GIT_BRANCH=$(git rev-parse --symbolic-full-name @|sed 's,refs/heads/,,')

[uqs]

Makefile

192

Yeah, just git pull --rebase is fine. This will pull and rebase from the tracked upstream and if people set up their ports repo in strange ways, that's up to them then.

[uqs]

Makefile

179

this should error out and tell people that svn is no longer updated and they need to save their local patches and clone a new tree ...

looking for svn a few lines above then might also be fully obsolete (I haven't checked the rest of the file)

185

ditto. This should tell them to use a plain git clone

[sbz]

We do not need to specify the current branch and remote, as pointed by @uqs by default it uses the tracked upstream

Also confirmed in the git-pull(1) man page

-r, --rebase[=false|true|merges|preserve|interactive]
	When true, rebase the current branch on top of the upstream branch
	after fetching.

[sbz]

Makefile

179

It's good concern, but it should be threat in a different review. Also I never used git-svn, maybe we should just totally remove the svn bits as the svn repo is not updated, it's totally deprecated.

185

Same here, in another review or just remove the git+svn bits.