ter Smitten's

Sometimes you just want to send an email with a (binary) attachment, this is how you do that:

apt-get install sharutils

uuencode < input-attachment.bin output-attachment.bin | mail foo@bar

References:

• How To Send an Email With Attachment and Body from Linux

To change the owner trust value of a given public (GPG) key you would normally use the gpg --edit-key 8A581CE7. This presents us a menu which enables you to do all key related tasks:

root@ubuntu-1404:~# gpg --edit-key 8A581CE7
gpg (GnuPG) 1.4.16; Copyright (C) 2013 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Secret key is available.

pub  4096R/8A581CE7  created: 2015-04-30  expires: never       usage: SCEA
                     trust: ultimate      validity: ultimate
sub  4096R/968AB157  created: 2015-04-30  expires: never       usage: SEA 
[ultimate] (1). Duplicity Backup <root@foo.bar>

gpg> trust
pub  4096R/8A581CE7  created: 2015-04-30  expires: never       usage: SCEA
                     trust: ultimate      validity: ultimate
sub  4096R/968AB157  created: 2015-04-30  expires: never       usage: SEA 
[ultimate] (1). Duplicity Backup <root@foo.bar>

Please decide how far you trust this user to correctly verify other users' keys
(by looking at passports, checking fingerprints from different sources, etc.)

  1 = I don't know or won't say
  2 = I do NOT trust
  3 = I trust marginally
  4 = I trust fully
  5 = I trust ultimately
  m = back to the main menu

Your decision? 5
Do you really want to set this key to ultimate trust? (y/N) y

pub  4096R/8A581CE7  created: 2015-04-30  expires: never       usage: SCEA
                     trust: ultimate      validity: ultimate
sub  4096R/968AB157  created: 2015-04-30  expires: never       usage: SEA 
[ultimate] (1). Duplicity Backup <root@foo.bar>

But that requires interaction. What if we would need to do it from a shell script for instance?

Method 1, shell magic

The output of gpg --export-ownertrust looks like this:

# List of assigned trustvalues, created Thu 30 Apr 2015 08:56:18 PM UTC
# (Use "gpg --import-ownertrust" to restore them)
A38FBA1F60F422597F6441D5E1C4C3898A581CE7:6:

So let’s see how we can recreate that without using gpg --export-ownertrust:

Get the fingerprint of key 8A581CE7:

gpg --list-keys --fingerprint | grep 8A581CE7 -A 1 | tail -1

Remove all the spaces and get the right part:

tr -d '[:space:]' | awk 'BEGIN { FS = "=" } ; { print $2 }'

final version, feeded to gpg --import-ownertrust:

echo "$( \
  gpg --list-keys --fingerprint \
  | grep 8A581CE7 -A 1 | tail -1 \
  | tr -d '[:space:]' | awk 'BEGIN { FS = "=" } ; { print $2 }' \
):6:" | gpg --import-ownertrust;

Method 2, expect

Expect is a program that “talks” to other interactive programs according to a script. Following the script, Expect knows what can be expected from a program and what the correct response should be.

Install expect:

apt-get install expect

Create an expect script:

root@ubuntu-1404:~# cat set-trust.exp 
#!/usr/bin/expect

set timeout 10

spawn /usr/bin/gpg --edit-key $argv 0 --yes trust quit

expect "Your decision? " { send "5\r" }
expect "Do you really want to set this key to ultimate trust? (y/N) " { send "y\r" }

interact

Run the expect script (with argument):

chmod 0755 ./set-trust.exp

./set-trust.exp 8A581CE7

Due to some nasty bugs in PHP 5.3.2 we needed to update our Ubuntu 10.04 machines to 5.3.10 (still nasty, but better). This is how we accomplished that:

Remove the current APC version:

sudo pecl uninstall apc;

Add the brianmercer/php5 PPA repository:

sudo apt-get install python-software-properties;

sudo apt-add-repository ppa:brianmercer/php5;
sudo apt-get update;
sudo apt-get upgrade;

Reinstall APC:

sudo pecl install apc;

Although I should be ashame of running such an old version of Ubuntu, sometimes you’ll just have to deal with it. This particular machine needed a 3.x kernel for improved EXT4 filesystem performance.

It seems that in Ubuntu 10.04 there’re a couple of back-ported kernels available:

# apt-cache search linux-image-server-lts
linux-image-server-lts-backport-maverick - Linux kernel image on Server Equipment.
linux-image-server-lts-backport-natty - Linux kernel image on Server Equipment.
linux-image-server-lts-backport-oneiric - Linux kernel image on Server Equipment.

Let’s pick the latest one (11.10, Oneiric Ocelot) install that:

sudo apt-get install ubuntu-backport-oneiric linux-headers-server-lts-backport-oneiric;

After a reboot we should be upgraded:

# uname -a
Linux server.oefenweb.nl 3.0.0-32-server #51~lucid1-Ubuntu SMP Fri Mar 22 17:53:04 UTC 2013 x86_64 GNU/Linux

Let’s say we want to list a specific range of commits in SVN. The snipped below would do the trick:

svn log -r 1342:1402;

It also seems the we can go even further by specifying a date range instead of revision numbers (not tested):

svn log -r {2010-11-01}:{2011-05-04};