[PATCH] transaction: do not overwrite atomic-temp files on error

[Augie Fackler]

queued, thanks

> On Dec 23, 2018, at 1:32 AM, Yuya Nishihara <yuya at tcha.org> wrote:
> 
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1545536360 -32400
> #      Sun Dec 23 12:39:20 2018 +0900
> # Node ID d7abe8f0de4640541bb5717be36e21176733fa40
> # Parent  ce0bc2952e2a4061b0961efe11cf7af064c8ea8f
> transaction: do not overwrite atomic-temp files on error
> 
> Even though the original files can be restored from the backup, it should be
> better to not write back a temporary file if we know it can be corrupted.
> 
> diff --git a/mercurial/transaction.py b/mercurial/transaction.py
> --- a/mercurial/transaction.py
> +++ b/mercurial/transaction.py
> @@ -347,9 +347,13 @@ class transaction(util.transactional):
>                     files.append(vfs(name, 'w', atomictemp=True,
>                                      checkambig=checkambig))
>                 genfunc(*files)
> +                for f in files:
> +                    f.close()
> +                # skip discard() loop since we're sure no open file remains
> +                del files[:]
>             finally:
>                 for f in files:
> -                    f.close()
> +                    f.discard()
>         return any
> 
>     @active
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