Wink Saville <w...@saville.com> writes:

> I've tried to teach 'git remote add' the --prefix-tags option using the
> technique Junio provided. At moment it is PR #486 on github [1]
> and I'd love some comments on whether or not this the right direction
> for fetching tags and putting them in the branches namespace.
>
> -- Wink
>
> [1] https://github.com/git/git/pull/486

FWIW, here is how that pull/486/head looks like.

-- >8 --

From: Wink Saville <w...@saville.com>
Date: Thu, 26 Apr 2018 09:56:11 -0700
Subject: [PATCH] Teach remote add the --prefix-tags option

When --prefix-tags is passed to `git remote add` the tagopt is set to
--prefix-tags and a second fetch line is added so tags are placed in
the branches namespace.

For example:
  $ git remote add -f --prefix-tags gbenchmark g...@github.com:google/benchmark
  Updating gbenchmark
  warning: no common commits
  remote: Counting objects: 4406, done.
  remote: Compressing objects: 100% (18/18), done.
  remote: Total 4406 (delta 7), reused 13 (delta 6), pack-reused 4382
  Receiving objects: 100% (4406/4406), 1.34 MiB | 7.46 MiB/s, done.
  Resolving deltas: 100% (2865/2865), done.
  From github.com:google/benchmark
   * [new branch]      clangtidy       -> gbenchmark/clangtidy
   * [new branch]      iter_report     -> gbenchmark/iter_report
   * [new branch]      master          -> gbenchmark/master
   * [new branch]      releasing       -> gbenchmark/releasing
   * [new branch]      reportercleanup -> gbenchmark/reportercleanup
   * [new branch]      rmheaders       -> gbenchmark/rmheaders
   * [new branch]      v2              -> gbenchmark/v2
   * [new tag]         v0.0.9          -> refs/remote-tags/gbenchmark/v0.0.9
   * [new tag]         v0.1.0          -> refs/remote-tags/gbenchmark/v0.1.0
   * [new tag]         v1.0.0          -> refs/remote-tags/gbenchmark/v1.0.0
   * [new tag]         v1.1.0          -> refs/remote-tags/gbenchmark/v1.1.0
   * [new tag]         v1.2.0          -> refs/remote-tags/gbenchmark/v1.2.0
   * [new tag]         v1.3.0          -> refs/remote-tags/gbenchmark/v1.3.0
   * [new tag]         v1.4.0          -> refs/remote-tags/gbenchmark/v1.4.0

And the .git/config remote "gbenchmark" section looks like:
  [remote "gbenchmark"]
    url = g...@github.com:google/benchmark
    fetch = +refs/heads/*:refs/remotes/gbenchmark/*
    fetch = +refs/tags/*:refs/remote-tags/gbenchmark/*
    tagopt = --prefix-tags
---
 Documentation/git-remote.txt |  8 ++++--
 builtin/remote.c             | 47 +++++++++++++++++++++++++++++++++---
 remote.c                     |  2 ++
 3 files changed, 51 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-remote.txt b/Documentation/git-remote.txt
index 4feddc0293..cdfd24e2ea 100644
--- a/Documentation/git-remote.txt
+++ b/Documentation/git-remote.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git remote' [-v | --verbose]
-'git remote add' [-t <branch>] [-m <master>] [-f] [--[no-]tags] 
[--mirror=<fetch|push>] <name> <url>
+'git remote add' [-t <branch>] [-m <master>] [-f] [--prefix-tags | --tags | 
--no-tags] [--mirror=<fetch|push>] <name> <url>
 'git remote rename' <old> <new>
 'git remote remove' <name>
 'git remote set-head' <name> (-a | --auto | -d | --delete | <branch>)
@@ -54,7 +54,11 @@ With `-f` option, `git fetch <name>` is run immediately after
 the remote information is set up.
 +
 With `--tags` option, `git fetch <name>` imports every tag from the
-remote repository.
+remote repository to refs/tags, use --prefix-tags to import them
+to refs/remote-tags/<name>/<tag>.
++
+With `--prefix-tags` option, `git fetch <name>` imports every tag from the
+remote repository to refs/remote-tags/<name>/<tag>.
 +
 With `--no-tags` option, `git fetch <name>` does not import tags from
 the remote repository.
diff --git a/builtin/remote.c b/builtin/remote.c
index 805ffc05cd..75813eeaa3 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -11,7 +11,7 @@
 
 static const char * const builtin_remote_usage[] = {
        N_("git remote [-v | --verbose]"),
-       N_("git remote add [-t <branch>] [-m <master>] [-f] [--tags | 
--no-tags] [--mirror=<fetch|push>] <name> <url>"),
+       N_("git remote add [-t <branch>] [-m <master>] [-f] [--prefix-tags | 
--tags | --no-tags] [--mirror=<fetch|push>] <name> <url>"),
        N_("git remote rename <old> <new>"),
        N_("git remote remove <name>"),
        N_("git remote set-head <name> (-a | --auto | -d | --delete | 
<branch>)"),
@@ -101,7 +101,8 @@ static int fetch_remote(const char *name)
 enum {
        TAGS_UNSET = 0,
        TAGS_DEFAULT = 1,
-       TAGS_SET = 2
+       TAGS_SET = 2,
+       TAGS_SET_PREFIX = 3
 };
 
 #define MIRROR_NONE 0
@@ -123,6 +124,16 @@ static void add_branch(const char *key, const char 
*branchname,
        git_config_set_multivar(key, tmp->buf, "^$", 0);
 }
 
+static void add_remote_tags(const char *key, const char *branchname,
+                      const char *remotename, struct strbuf *tmp)
+{
+       strbuf_reset(tmp);
+       strbuf_addch(tmp, '+');
+       strbuf_addf(tmp, "refs/tags/%s:refs/remote-tags/%s/%s",
+                               branchname, remotename, branchname);
+       git_config_set_multivar(key, tmp->buf, "^$", 0);
+}
+
 static const char mirror_advice[] =
 N_("--mirror is dangerous and deprecated; please\n"
    "\t use --mirror=fetch or --mirror=push instead");
@@ -161,6 +172,9 @@ static int add(int argc, const char **argv)
                OPT_SET_INT(0, "tags", &fetch_tags,
                            N_("import all tags and associated objects when 
fetching"),
                            TAGS_SET),
+               OPT_SET_INT(0, "prefix-tags", &fetch_tags,
+                           N_("import all tags and associated objects when 
fetching and prefix with <name>"),
+          TAGS_SET_PREFIX),
                OPT_SET_INT(0, NULL, &fetch_tags,
                            N_("or do not fetch any tag at all (--no-tags)"), 
TAGS_UNSET),
                OPT_STRING_LIST('t', "track", &track, N_("branch"),
@@ -215,10 +229,35 @@ static int add(int argc, const char **argv)
        }
 
        if (fetch_tags != TAGS_DEFAULT) {
+               if (fetch_tags == TAGS_SET_PREFIX) {
+                       strbuf_reset(&buf);
+                       strbuf_addf(&buf, "remote.%s.fetch", name);
+                       if (track.nr == 0)
+                               string_list_append(&track, "*");
+                       for (i = 0; i < track.nr; i++) {
+                               add_remote_tags(buf.buf, track.items[i].string,
+                                               name, &buf2);
+                       }
+               }
+
                strbuf_reset(&buf);
                strbuf_addf(&buf, "remote.%s.tagopt", name);
-               git_config_set(buf.buf,
-                              fetch_tags == TAGS_SET ? "--tags" : "--no-tags");
+               char* config_val = NULL;
+               switch (fetch_tags) {
+               case TAGS_UNSET:
+                       config_val = "--no-tags";
+                       break;
+               case TAGS_SET:
+                       config_val = "--tags";
+                       break;
+               case TAGS_SET_PREFIX:
+                       config_val = "--prefix-tags";
+                       break;
+               default:
+                       die(_("Unexpected TAGS enum %d"), fetch_tags);
+                       break;
+               }
+               git_config_set(buf.buf, config_val);
        }
 
        if (fetch && fetch_remote(name))
diff --git a/remote.c b/remote.c
index 91eb010ca9..f383ce3cdf 100644
--- a/remote.c
+++ b/remote.c
@@ -447,6 +447,8 @@ static int handle_config(const char *key, const char 
*value, void *cb)
                        remote->fetch_tags = -1;
                else if (!strcmp(value, "--tags"))
                        remote->fetch_tags = 2;
+               else if (!strcmp(value, "--prefix-tags"))
+                       remote->fetch_tags = -1; // A fetch for refs/tags is 
present so tags are retrieved
        } else if (!strcmp(subkey, "proxy")) {
                return git_config_string((const char **)&remote->http_proxy,
                                         key, value);
-- 
2.17.0-391-g1f1cddd558

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