[Bug 210537] [patch] [feature request] set MIME type in cron-generated e-mails

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Aug 9 20:18:42 UTC 2017


Eugene Grosbein <eugen at freebsd.org> changed:

           What    |Removed                     |Added
                 CC|                            |eugen at freebsd.org

--- Comment #5 from Eugene Grosbein <eugen at freebsd.org> ---
While the intention is good and proposed feature would be useful, the solution
has are some rough edges.

First, it's not very flexible to implement this as global option. You could
easily make it per-crontab depending on environment variable like CONTENT_TYPE.
Cron already looks at per-crontab MAILTO environment variable, why not look at

Then, cutting contents at first 1024 bytes embedded in the code is error-prone.
Note well: libmagic has MAGIC_PARAM_REGEX_MAX==8192 currently.

I'd suggest "CONTENT_TYPE=libmagic:1024" format when ":1024" part would be
optional to redefine default of MAGIC_PARAM_REGEX_MAX.

Also, I would not be so sure about "Content-Transfer-Encoding: 8bit" header.
8bit does not mean "any data". According to RFC 2045
https://www.ietf.org/rfc/rfc2045.txt , it means short (998 octets or less) text
strings without null bytes and CR/LF octets in CRLF sequences only. If the body
contains binary data, the "binary" Content-Transfer-Encoding token must be
used. Mentioned PNG would violate "8bit" for sure.

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