Re: [PATCH v5 6/6] fast-export, fast-import: add support for signed-commits

> diff --git a/Documentation/git-fast-export.adoc b/Documentation/git-fast-export.adoc
> index 1b19f17b78..8750dd150b 100644
> --- a/Documentation/git-fast-export.adoc
> +++ b/Documentation/git-fast-export.adoc
> @@ -43,6 +43,17 @@ they will be exported, but you will see a warning.  'verbatim' and
>  transformation affecting tags will be performed, or if you do not
>  care that the resulting tag will have an invalid signature.
>
> +--signed-commits=(verbatim|warn-verbatim|warn-strip|strip|abort)::
> +       Specify how to handle signed commits.  Behaves exactly as
> +       '--signed-tags', but for commits.

> ++
> +Earlier versions this command that did not have '--signed-commits'
> +behaved as if '--signed-commits=strip'.  As an escape hatch for users
> +of tools that call 'git fast-export' but do not yet support
> +'--signed-commits', you may set the environment variable
> +'FAST_EXPORT_SIGNED_COMMITS_NOABORT=1' in order to change the default
> +from 'abort' to 'warn-strip'.

> @@ -611,6 +615,44 @@ static void anonymize_ident_line(const char **beg, const char **end)
>         *end = out->buf + out->len;
>  }
>
> +/*
> + * find_commit_multiline_header is similar to find_commit_header,
> + * except that it handles multi-line headers, rathar than simply