git fetch doesn't ignore funny refs

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Hello,

I'm trying to maintain a mirror of a repo that is published with gerrit.
The repo contains
a "funny ref" with name 'refs/tags/xyz/...' .

When I clone the repo the ref is correctly ignored:

> git clone --mirror ssh://server:29418/repo

Cloning into bare repository 'repo.git'...
error: * Ignoring funny ref 'refs/tags/xyz/...' locally
remote: Counting objects: 58263, done
remote: Finding sources: 100% (58263/58263)
remote: Total 58263 (delta 40882), reused 58131 (delta 40882)
Receiving objects: 100% (58263/58263), 16.10 MiB | 163.00 KiB/s, done.
Resolving deltas: 100% (40882/40882), done.
Checking connectivity... done.

When I try to update the mirror, however, the command fails:

> git remote update

Fetching origin
error: * Ignoring funny ref refs/tags/xyz/...' locally
>From ssh://server:29418/repo
 ! [new tag]         xyz/... -> xyz/...  (unable to update local ref)
error: Could not fetch origin

Doing a fetch also fails:

> git fetch --all

Fetching origin
error: * Ignoring funny ref 'refs/tags/xyz/...' locally
>From ssh://server:29418/repo
 ! [new tag]         xyz/... -> xyz/...  (unable to update local ref)
error: Could not fetch origin

If I force not to update the tags, then the command is successful:

> git fetch --all -n

Fetching origin
error: * Ignoring funny ref 'refs/tags/xyz/...' locally

I believe the problem is due to the fact that in function
find_non_local_tags() in file builtins/fetch.c
the refs are directly obtained from the transport and not filtered for
funny entries.

A check as this one:

if (check_refname_format(ref->name, 0))
   continue;

fixes the problem for me.

I report here bug and fix in the hope it can be reviewed and integrated
in future git releases.

Best regards,
Lorenzo Keller
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