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push: improve the error shown on unqualified <dst> push 

Improve the error message added in f8aae12034 ("push: allow
unqualified dest refspecs to DWIM", 2008-04-23), which before this
change looks like this:

    $ git push avar v2.19.0^{commit}:newbranch -n
    error: unable to push to unqualified destination: newbranch
    The destination refspec neither matches an existing ref on the remote nor
    begins with refs/, and we are unable to guess a prefix based on the source ref.
    error: failed to push some refs to 'git@github.com:avar/git.git'

This message needed to be read very carefully to spot how to fix the
error, i.e. to push to refs/heads/newbranch. Now the message will look
like this instead:

    $ ./git-push avar v2.19.0^{commit}:newbranch -n
    error: The destination you provided is not a full refname (i.e.,
    starting with "refs/"). We tried to guess what you meant by:

    - Looking for a ref that matches 'newbranch' on the remote side.
    - Checking if the <src> being pushed ('v2.19.0^{commit}')
      is a ref in "refs/{heads,tags}/". If so we add a corresponding
      refs/{heads,tags}/ prefix on the remote side.

    Neither worked, so we gave up. You must fully qualify the ref.
    error: failed to push some refs to 'git@github.com:avar/git.git'

This improvement is the result of on-list discussion in [1] and [2],
as well as my own fixes / reformatting / phrasing on top.

The suggestion by Jeff on-list was to make that second bullet point
"Looking at the refname of the local source.". The version being added
here is more verbose, but also more accurate. saying "local source"
could refer to any ref in the local refstore, including something in
refs/remotes/*. A later change will teach guess_ref() to infer a ref
type from remote-tracking refs, so let's not confuse the two.

While I'm at it, add a "TRANSLATORS" comment since the message has
gotten more complex and it's not as clear what the two %s's refer to.

1. https://public-inbox.org/git/20181010205505.GB12949@sigill.intra.peff.net/
2. https://public-inbox.org/git/xmqqbm81lb7c.fsf@gitster-ct.c.googlers.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2018-11-13 19:52:41 +00:00 committed by Junio C Hamano
parent 8b0e542912
commit c83cca3f74
1 changed files with 16 additions and 6 deletions
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22
remote.c
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@ -1049,12 +1049,22 @@ static int match_explicit(struct ref *src, struct ref *dst,
matched_dst = make_linked_ref(dst_guess, dst_tail);
free(dst_guess);
} else {
error(_("unable to push to unqualified destination: %s\n"
"The destination refspec neither matches an "
"existing ref on the remote nor\n"
"begins with refs/, and we are unable to "
"guess a prefix based on the source ref."),
dst_value);
/*
* TRANSLATORS: "matches '%s'%" is the <dst>
* part of "git push <remote> <src>:<dst>"
* push, and "being pushed ('%s')" is the
* <src>.
*/
error(_("The destination you provided is not a full refname (i.e.,\n"
"starting with \"refs/\"). We tried to guess what you meant by:\n"
"\n"
"- Looking for a ref that matches '%s' on the remote side.\n"
"- Checking if the <src> being pushed ('%s')\n"
" is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
" refs/{heads,tags}/ prefix on the remote side.\n"
"\n"
"Neither worked, so we gave up. You must fully qualify the ref."),
dst_value, matched_src->name);
}
break;
default: