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remote.c: untangle error logic in branch_get_upstream

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The error-diagnosis logic in branch_get_upstream was copied
straight from sha1_name.c in the previous commit. However,
because we check all error cases and upfront and then later
diagnose them, the logic is a bit tangled. In particular:

  - if branch->merge[0] is NULL, we may end up dereferencing
    it for an error message (in practice, it should never be
    NULL, so this is probably not a triggerable bug).

  - We may enter the code path because branch->merge[0]->dst
    is NULL, but we then start our error diagnosis by
    checking whether our local branch exists. But that is
    only relevant to diagnosing missing merge config, not a
    missing tracking ref; our diagnosis may hide the real
    problem.

Instead, let's just use a sequence of "if" blocks to check
for each error type, diagnose it, and return NULL.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2015-05-21 20:46:43 -04:00 committed by Junio C Hamano
parent 3a429d0af3
commit 1ca41a1932
1 changed files with 13 additions and 6 deletions
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19
remote.c
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@ -1721,18 +1721,25 @@ const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
{
if (!branch)
return error_buf(err, _("HEAD does not point to a branch"));
if (!branch->merge || !branch->merge[0] || !branch->merge[0]->dst) {
if (!branch->merge || !branch->merge[0]) {
/*
* no merge config; is it because the user didn't define any,
* or because it is not a real branch, and get_branch
* auto-vivified it?
*/
if (!ref_exists(branch->refname))
return error_buf(err, _("no such branch: '%s'"),
branch->name);
if (!branch->merge)
return error_buf(err,
_("no upstream configured for branch '%s'"),
branch->name);
return error_buf(err,
_("no upstream configured for branch '%s'"),
branch->name);
}
if (!branch->merge[0]->dst)
return error_buf(err,
_("upstream branch '%s' not stored as a remote-tracking branch"),
branch->merge[0]->src);
}
return branch->merge[0]->dst;
}