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From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: "Derrick Stolee" <stolee@gmail.com>,
	"Git List" <git@vger.kernel.org>,
	"Jonathan Tan" <jonathantanmy@google.com>,
	"René Scharfe" <l.s.r@web.de>
Subject: Re: Git Test Coverage Report (v2.27.0-rc0)
Date: Wed, 20 May 2020 01:38:12 +0000
Message-ID: <20200520013812.GS6362@camp.crustytoothpaste.net> (raw)
In-Reply-To: <20200519234208.GR6362@camp.crustytoothpaste.net>


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On 2020-05-19 at 23:42:08, brian m. carlson wrote:
> On 2020-05-19 at 12:11:15, Derrick Stolee wrote:
> > On 5/15/2020 1:22 PM, Derrick Stolee wrote:
> > > brian m. carlson	13e7ed6a builtin/checkout: compute checkout metadata for checkouts
> > > builtin/checkout.c
> > > 13e7ed6a 625)        is_null_oid(&info->oid) ? &tree->object.oid :
> > 
> > This is part of the following hunk:
> > 
> > @@ -619,6 +620,11 @@ static int reset_tree(struct tree *tree, const struct checkout_opts *o,
> >         opts.verbose_update = o->show_progress;
> >         opts.src_index = &the_index;
> >         opts.dst_index = &the_index;
> > +       init_checkout_metadata(&opts.meta, info->refname,
> > +                              info->commit ? &info->commit->object.oid :
> > +                              is_null_oid(&info->oid) ? &tree->object.oid :
> > +                              &info->oid,
> > +                              NULL);
> >         parse_tree(tree);
> >         init_tree_desc(&tree_desc, tree->buffer, tree->size);
> >         switch (unpack_trees(1, &tree_desc, &opts)) {
> > 
> > The double-nested ternary definitely complicates the coverage here.
> > It also points out that all tests have `info->commit` a non-NULL.
> > 
> > This certainly looks safe, but I don't know.
> 
> This is me trying to be defensive.  I think the code path that is not
> covered here that can be is the info->oid code path; I don't technically
> believe the other case (using the tree) is possible, although the
> checkout code is complex enough that I can't be certain.

Actually, with more research, it looks like this can just be simplified
since info->commit must be non-NULL.  I've analyzed the code and am
confident that's guaranteed to be the case, and the test suite has
confirmed no segfaults by making that assumption, so I'll send a patch
imminently that just does that.
-- 
brian m. carlson: Houston, Texas, US
OpenPGP: https://keybase.io/bk2204

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  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 17:22 Derrick Stolee
2020-05-19 12:11 ` Derrick Stolee
2020-05-19 20:07   ` René Scharfe
2020-05-19 23:42   ` brian m. carlson
2020-05-20  1:38     ` brian m. carlson [this message]
2020-05-19 18:31 ` [PATCH] t4067: make rename detection test output raw diff Jonathan Tan
2020-05-19 19:00   ` Derrick Stolee
2020-05-20  1:41 ` [PATCH 1/1] builtin/checkout: simplify metadata initialization brian m. carlson
2020-05-20 15:17   ` Junio C Hamano
2020-05-20 22:37     ` brian m. carlson
2020-05-21  2:07 ` [PATCH v2 0/2] Improve Fix code coverage for checkout brian m. carlson
2020-05-21  2:07   ` [PATCH v2 1/2] builtin/checkout: simplify metadata initialization brian m. carlson
2020-05-21 17:35     ` Junio C Hamano
2020-05-23 12:22       ` brian m. carlson
2020-05-21  2:07   ` [PATCH v2 2/2] t2060: add a test for switch with --orphan and --discard-changes brian m. carlson
2020-05-21 12:38   ` [PATCH v2 0/2] Improve Fix code coverage for checkout Derrick Stolee

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