missing tags from "git fetch"

* missing tags from "git fetch"
@ 2019-10-02 13:10 Martin Nicolay
  2019-10-02 13:55 ` Jeff King
  0 siblings, 1 reply; 5+ messages in thread
From: Martin Nicolay @ 2019-10-02 13:10 UTC (permalink / raw)
  To: git

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Hi!

I don't know if this is a lack of understanding or a software or 
documentation bug.

man git-fetch says about tags:
        By default, any tag that points into the histories being fetched is
        also fetched; the effect is to fetch tags that point at branches that
        you are interested in.

If I fetch without --tags the tags that point to the commits of the 
fetched branch are not fetched. If I fetch with --tags than all tags are 
fetched but I only wish to fetch tags pointing to something in the 
branch fetched.

Here is a self contained example:
--------------------------
$ cd /tmp
$ git init r1 && cd r1
Initialized empty Git repository in /tmp/r1/.git/
$ date >f1
$ git add f1
$ git commit -minitial f1
[master (root-commit) 61753c60ac] initial
  1 file changed, 1 insertion(+)
  create mode 100644 f1
$ git tag -mt1 t1
$ git tag t2
$ git init ../r2 && cd ../r2
Initialized empty Git repository in /tmp/r2/.git/
$ git remote add origin $(cd ../r1; pwd)
$ git fetch origin master
remote: Enumerating objects: 3, done.
remote: Counting objects: 100% (3/3), done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From /tmp/r1
  * branch                  master     -> FETCH_HEAD
  * [new branch]            master     -> origin/master
$ git tag | wc
       0       0       0
$ git fetch --tags origin master
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (1/1), done.
From /tmp/r1
  * branch                  master     -> FETCH_HEAD
  * [new tag]               t1         -> t1
  * [new tag]               t2         -> t2
$ git tag | wc
       2       2       6
$ git rev-parse FETCH_HEAD
61753c60ac550a5315b7c930a701b94f36e08e4f
$ git rev-parse t1^{commit}
61753c60ac550a5315b7c930a701b94f36e08e4f
$ git rev-parse t2^{commit}
61753c60ac550a5315b7c930a701b94f36e08e4f
--------------------------

Obviously the two tags point to the fetched commit but without --tags 
they are not fetched. The behavior is identical for lightweight and 
annotated tags.

Best regards
Martin Nicolay

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