Re: mhbuild: extraneous information in message

[Steven Winikoff]

>The complaint about ‘/octet-stream’ coupled with the trailing
>‘application’ after ‘audio/mpeg’ looks like two things are being
>combined, e.g. ‘audio/mpeg application/octet-stream’.

That makes sense.


>- How do you attach the MP3 file?

By typing "at /path/to/file.mp3" at the whatnow? prompt.

...and I just checked the man page for whatnow and discovered the -v option:

   What now? at -v /tmp/session2.mp3
   Attaching /tmp/session2.mp3 as a audio/mpegapplication/octet-stream

   What now? s

(I didn't actually send anything just now, but that's what would follow).

The relevant .mh_profile entries (at least, the ones I recognize as being
relevant) are:

   comp:           -form .compform
   send:           -msgid -messageid random -alias .aliases -port 25
   mhbuild:        -maxunencoded 500


>- Can we see a draft before mhbuild gets run?

Sure, here's one:

   8<--------------------------   cut here   ---------------------------->8
   To: smw@smwonline.ca
   Subject: foo
   Fcc: inbox
   From: Steven Winikoff <smw@smwonline.ca>
   Reply-to: Steven Winikoff <smw@smwonline.ca>
   Content-Type: text/plain; charset="UTF-8"
   Nmh-Attach: /tmp/session2.mp3
   --------

   --
   ___________________________________________________________________________
   Steven Winikoff      |
   Montreal, QC, Canada | "The worst misunderstandings are the
   smw@smwonline.ca     |  unspoken ones."
   http://smwonline.ca  |
                        |                      - Spider Robinson
   8<--------------------------   cut here   ------------------------->8

But I don't think you'll need it, because...


>- What does ‘file -i’ give on the MP3 file?

...Aha!  You nailed it:

   $ file -i /tmp/session2.mp3
   /tmp/session2.mp3: audio/mpegapplication/octet-stream; charset=binary

...and similarly,

   $ file --mime-type /tmp/session2.mp3
   /tmp/session2.mp3: audio/mpegapplication/octet-stream

I hadn't known about the -i option until you suggested it, and I found
--mime-type just now while looking up -i.  With no options, file reports

   $ file /tmp/session2.mp3
   /tmp/session2.mp3: Audio file with ID3 version 2.4.0, contains:MPEG ADTS, 
layer III, v1, 64 kbps, 48 kHz, Stereo

Running strace on file lists the following openat() calls:

    openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libmagic.so.1", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libseccomp.so.2", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libbz2.so.1.0", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, 0x555892c2d4f0, O_RDONLY) = 3
    openat(AT_FDCWD, 0x153f7cb54848, O_RDONLY) = -1 ENOENT (No such file or 
directory)
    openat(AT_FDCWD, 0x7ffc2a816a10, O_RDONLY|O_CLOEXEC) = 3
    openat(AT_FDCWD, 0x7ffc2a819209, O_RDONLY|O_NONBLOCK|O_CLOEXEC) = 3

...which includes none of the files I expected to see.  The magic database
on this system is /usr/share/file/misc/magic.mgc (the text version is
supported by libmagic, but doesn't exist), and suspiciously, it was
modified by a recent system upgrade:

   $ ls -l /usr/share/file/misc/magic.mgc
   -rw-r--r-- 1 root root 7012776 Apr 12 12:20 /usr/share/file/misc/magic.mgc

I have a backup copy from before the upgrade:

   $ ls -l /path/to/backup/of/misc/magic.mgc
   -rw-r--r-- 6 root root 6652192 Jun 16  2020 /path/to/backup/of/magic.mgc

But:

   $ file -i -k -m /path/to/backup/of/misc/magic.mgc /tmp/session2.mp3
   /tmp/session2.mp3: audio/mpegapplication/octet-stream; charset=binary

...and the atime reported by stat(1) confirms that the backup file was
accessed, so there's still something I'm obviously missing.


>- What's ‘folder -version’ yield?

   $ folder -version
   folder -- nmh-1.7.1 built 2019-12-16 03:09:06 +0000 on mort

     - Steven
-- 
___________________________________________________________________________
Steven Winikoff      | "The best executive is one who has sense
Montreal, QC, Canada |  enough to pick good people to do what he
smw@smwonline.ca     |  wants done, and self-restraint enough to
http://smwonline.ca  |  keep from meddling with them while they
                     |  do it."
                     |                      - Theodore Roosevelt