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From: Duy Nguyen <pclouds@gmail.com>
To: Eric Sunshine <sunshine@sunshineco.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Junio C Hamano <gitster@pobox.com>,
	Mark Levedahl <mlevedahl@gmail.com>,
	Mikael Magnusson <mikachu@gmail.com>
Subject: Re: [PATCH v2 08/23] checkout: fix bug with --to and relative HEAD
Date: Sat, 4 Jul 2015 09:45:01 +0700	[thread overview]
Message-ID: <CACsJy8C=BZF57GqRxO6CfBAYOxywEd4zHay4cgSZMrKCv6u77w@mail.gmail.com> (raw)
In-Reply-To: <1435969052-540-9-git-send-email-sunshine@sunshineco.com>

On Sat, Jul 4, 2015 at 7:17 AM, Eric Sunshine <sunshine@sunshineco.com> wrote:
> Given "git checkout --to <path> HEAD~1", the new worktree's HEAD should
> begin life at the current branch's HEAD~1, however, it actually ends up
> at HEAD~2. The happens because:
>
>     1. git-checkout resolves HEAD~1
>
>     2. to satisfy is_git_directory, prepare_linked_worktree() creates a
>        HEAD in the new worktree with the value of the resolved HEAD~1
>
>     3. git-checkout re-invokes itself with the same arguments within the
>        new worktree to populate the worktree
>
>     4. the sub git-checkout resolves HEAD~1 relative to its own HEAD,
>        which is the resolved HEAD~1 from the original invocation,
>        resulting unexpectedly and incorrectly in HEAD~2 (relative to the
>        original)
>
> Fix this by unconditionally assigning the current worktree's HEAD as the
> value of the new worktree's HEAD.

Good catch!

> @@ -924,9 +925,11 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
>          * value would do because this value will be ignored and
>          * replaced at the next (real) checkout.
>          */

This comment "any valid value would do.. will be ignored" is proved incorrect.

> +       if (!resolve_ref_unsafe("HEAD", 0, rev, NULL))
> +               die(_("unable to resolve HEAD"));
>         strbuf_reset(&sb);
>         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
> -       write_file(sb.buf, 1, "%s\n", sha1_to_hex(new->commit->object.sha1));
> +       write_file(sb.buf, 1, "%s\n", sha1_to_hex(rev));
>         strbuf_reset(&sb);
>         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
>         write_file(sb.buf, 1, "../..\n");
-- 
Duy

  reply	other threads:[~2015-07-04  2:45 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-04  0:17 [PATCH v2 00/23] replace "checkout --to" with "worktree add" Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 01/23] Documentation/git-checkout: fix incorrect worktree prune command Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 02/23] Documentation/git-worktree: associate options with commands Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 03/23] Documentation: move linked worktree description from checkout to worktree Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 04/23] Documentation/git-worktree: add BUGS section Eric Sunshine
2015-07-04  2:41   ` Duy Nguyen
2015-07-04  8:48     ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 05/23] Documentation/git-worktree: split technical info from general description Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 06/23] Documentation/git-worktree: add high-level 'lock' overview Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 07/23] Documentation/git-worktree: add EXAMPLES section Eric Sunshine
2015-07-04  2:23   ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 08/23] checkout: fix bug with --to and relative HEAD Eric Sunshine
2015-07-04  2:45   ` Duy Nguyen [this message]
2015-07-04  8:49     ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 09/23] checkout: relocate --to's "no branch specified" check Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 10/23] checkout: prepare_linked_checkout: drop now-unused 'new' argument Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 11/23] checkout: make --to unconditionally verbose Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 12/23] checkout: drop 'checkout_opts' dependency from prepare_linked_checkout Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 13/23] worktree: introduce "add" command Eric Sunshine
2015-07-04  2:53   ` Duy Nguyen
2015-07-04  8:54     ` Eric Sunshine
2015-07-06  9:24       ` Duy Nguyen
2015-07-04  0:17 ` [PATCH v2 14/23] worktree: add --force option Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 15/23] worktree: add --detach option Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 16/23] worktree: add -b/-B options Eric Sunshine
2015-07-04  3:19   ` Duy Nguyen
2015-07-04  8:57     ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 17/23] tests: worktree: retrofit "checkout --to" tests for "worktree add" Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 18/23] checkout: retire --to option Eric Sunshine
2015-07-04  3:04   ` Duy Nguyen
2015-07-04  8:59     ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 19/23] checkout: require worktree unconditionally Eric Sunshine
2015-07-04  2:33   ` Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 20/23] worktree: extract basename computation to new function Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 21/23] worktree: add: make -b/-B default to HEAD when <branch> is omitted Eric Sunshine
2015-07-06 19:14   ` Junio C Hamano
2015-07-04  0:17 ` [PATCH v2 22/23] worktree: add: auto-vivify new branch " Eric Sunshine
2015-07-04  0:17 ` [PATCH v2 23/23] checkout: retire --ignore-other-worktrees in favor of --force Eric Sunshine

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