Re: [PATCH v2 6/6] worktree: new command to fix up worktree's info after moving

> This is a low-level command that can be used to correct worktree
> information after a worktree is moved. The idea is like 'index refresh'.
> In future we may do "worktree refresh" automatically to keep it from
> being pruned.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
> Documentation/git-worktree.txt |  8 +++++++-
> builtin/worktree.c             | 18 ++++++++++++++++++
> t/t1501-worktree.sh            |  9 +++++++++
> 3 files changed, 34 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/git-worktree.txt 
> b/Documentation/git-worktree.txt
> index 62c76c1..306aeec 100644
> --- a/Documentation/git-worktree.txt
> +++ b/Documentation/git-worktree.txt
> @@ -12,6 +12,7 @@ SYNOPSIS
> 'git worktree add' [-f] [--detach] [-b <new-branch>] <path> [<branch>]
> 'git worktree prune' [-n] [-v] [--expire <expire>]
> 'git worktree list' [--porcelain]
> +'git worktree refresh'
>
> DESCRIPTION
> -----------
> @@ -65,6 +66,11 @@ each of the linked worktrees.  The output details 
> include if the worktree is
> bare, the revision currently checked out, and the branch currently checked 
> out
> (or 'detached HEAD' if none).
>
> +refresh::
> +
> +This command is required to update worktree's information after it's 
> moved.
> +Executed from inside the moved worktree.
> +
> OPTIONS
> -------
>
> @@ -140,7 +146,7 @@ in the entry's directory. For example, if a linked 
> working tree is moved
> to `/newpath/test-next` and its `.git` file points to
> `/path/main/.git/worktrees/test-next`, then update
> `/path/main/.git/worktrees/test-next/gitdir` to reference 
> `/newpath/test-next`
> -instead.
> +instead. Alternatively you can run "git worktree refresh".

>
> To prevent a $GIT_DIR/worktrees entry from being pruned (which
> can be useful in some situations, such as when the
> diff --git a/builtin/worktree.c b/builtin/worktree.c
> index 475b958..0183ce0 100644
> --- a/builtin/worktree.c
> +++ b/builtin/worktree.c
> @@ -445,6 +445,22 @@ static int list(int ac, const char **av, const char 
> *prefix)
>  return 0;
> }
>
> +static int refresh(int ac, const char **av, const char *prefix)
> +{
> + const char *gitdir;
> +
> + if (ac != 1)
> + die(_("Arguments not expected"));
> +
> + gitdir = git_pathdup("gitdir");
> + if (access(gitdir, F_OK))
> + return 0;
> + if (!startup_info->first_gitfile)
> + die("BUG: .git file's location not found");
> + write_file(gitdir, "%s", startup_info->first_gitfile);
> + return 0;
> +}
> +
> int cmd_worktree(int ac, const char **av, const char *prefix)
> {
>  struct option options[] = {
> @@ -459,5 +475,7 @@ int cmd_worktree(int ac, const char **av, const char 
> *prefix)
>  return prune(ac - 1, av + 1, prefix);
>  if (!strcmp(av[1], "list"))
>  return list(ac - 1, av + 1, prefix);
> + if (!strcmp(av[1], "refresh"))
> + return refresh(ac - 1, av + 1, prefix);
>  usage_with_options(worktree_usage, options);
> }
> diff --git a/t/t1501-worktree.sh b/t/t1501-worktree.sh
> index cc5b870..821831b 100755
> --- a/t/t1501-worktree.sh
> +++ b/t/t1501-worktree.sh
> @@ -423,4 +423,13 @@ test_expect_success '$GIT_WORK_TREE overrides 
> $GIT_DIR/common' '
>  )
> '
>
> +test_expect_success 'worktree refresh corrects gitdir file' '
> + git worktree add test-refresh &&
> + P=repo.git/worktrees/test-refresh/gitdir &&
> + echo corrupt >$P &&
> + git -C test-refresh worktree refresh &&
> + echo "$TRASH_DIRECTORY/test-refresh/.git" >expected &&
> + test_cmp expected $P
> +'
> +
> test_done
> -- 
> 2.7.0.96.g5373197
>