Key Pressure

Force Ekiga 3.x Network Interface Setting

This post originally appeared here on 2009-07-19.

New Ekiga versions do not allow setting the network interface to send the requests. This is now controlled by to underlying OPAL library and Ekiga developer does not see any problems. The problems that are caused by sending REGISTERs on all the available interfaces hoping that at least one will make its way to the server.

This manifested as the following message during the registration:

Could not register(Timeout)

Now when more than one interface could reach the SIP server, such as virtualization ones enabled for forwarding - virbr, docker, ekiga fails with the following error:

Could not register (Globally not acceptable)

Bug 553595 – cannot connect to Asterisk server

Damien Sandras (ekiga developer):

We tend to automate things at maximum, so I don’t think it is possible.

Perhaps in 3.2 we will reintroduce a setting, but in that case if you listen only on one interface, there is no way to connect through a VPN and to the Internet at the same time. I’ll discuss with Robert, but I think the problem is on Asterisk side. One thing we could improve is that as soon we get an answer for one interface, we do not try others.

Basically, all what I needed to do is to expose one network interface to Ekiga so that it does not start sending bogus data through the other ones.

The answer is… ioctl wrapping done previously for my Motorola A1200 camera.

Sources here: ~rye/+junk/exposeif. Don’t forget to run ldconfig after installing.

Installing

$ bzr branch lp:~rye/+junk/exposeif
$ cd exposeif
$ make
$ sudo make install

Usage

/usr/local/bin/exposeif usage:

    /usr/local/bin/exposeif options program

Options:
    -i|--interfaces  List of interfaces to expose (comma delimited)
    -d|--debug       Debug output from libexposeif.so
    -h|--help        This help

Example:
    /usr/local/bin/exposeif -i eth0,lo ekiga -d 4

This is not a production-level code. It may cause memory leaks within the application. As always, standard no liability disclaimer applies.


Moving stuff around

The site has moved to a new hosting provider and got a new domain name, but all the old content should still be available and redirected to new location when needed.


Gem rebuild gotcha

Production machines should never have anything compiled from source, and they should not have the tools to do that. Keeping that in mind I was packaging ruby gems using the Effing Package Management.

Usually I write rpm spec files manually when no existing ones fit our purposes, making sure the updates won't affect existing installation, however packaging 100+ rubygems was not the thing I would like to spend a day working on.

Enter fpm

$ gem fetch berkshelf
Fetching: berkshelf-3.1.5.gem (100%)
Downloaded berkshelf-3.1.5
$ fpm -s gem -t rpm berkshelf-3.1.5.gem
no value for epoch is set, defaulting to nil {:level=>:warn}
no value for epoch is set, defaulting to nil {:level=>:warn}
Created package {:path=>"rubygem-berkshelf-3.1.5-1.noarch.rpm"}

Great! Except that the thing does not build the dependencies, but it references them in Requires field:

$ rpm -qpR rubygem-berkshelf-3.1.5-1.noarch.rpm
...
rubygem(octokit) >= 3.0
rubygem(octokit) < 4.0
rubygem(celluloid) >= 0.16.0.pre
rubygem(celluloid) < 0.16.1.0
rubygem(celluloid-io) >= 0.16.0.pre
rubygem(celluloid-io) < 0.16.1.0
...

See that 0.16.0.pre version?

The Version field in the spec is where the maintainer should put the current version of the software being packaged. If the version is non-numeric (contains tags that are not numbers), you may need to include the additional non-numeric characters in the release field. -- Fedora Packaging Naming Guidelines

To make the story short, our berkshelf RPM will not be installable, celluloid RPM with version 0.16.0 will not satisfy 0.16.0.pre requirements.

A quick and dirty way of handling this would be to build celluloid RPM as is, but update berkshelf's gemspec to reference the version we can use.

Rebuilding gem

Should be as easy as gem unpack and gem build:

$ gem unpack berkshelf-3.1.5.gem
Unpacked gem: '/tmp/vendor/cache/berkshelf-3.1.5'
$ sed -i 's/0\.pre/0/' berkshelf-3.1.5/berkshelf.gemspec
$ gem build berkshelf-3.1.5/berkshelf.gemspec
fatal: Not a git repository (or any of the parent directories): .git
WARNING:  description and summary are identical
  Successfully built RubyGem
  Name: berkshelf
  Version: 3.1.5
  File: berkshelf-3.1.5.gem

Notice fatal: Not a git repository and look at the resulting gem:

$ ls -l berkshelf-3.1.5.gem
-rw-r--r-- 1 rye rye 4608 Oct 25 16:56 berkshelf-3.1.5.gem

The resulting gem is almost 5kiB, down from original 103K. Our gem is empty now.

Note: gem unpack --spec would produce yaml-formatted gemspec file which will not be accepted by gem build. fpm --no-gem-prerelease does not affect dependencies.

Enter git

Look at berkshelf.gemspec and notice that it uses git to provide the file listing:

...
  s.homepage                  = 'http://berkshelf.com'
  s.license                   = 'Apache 2.0'
  s.files                     = `git ls-files`.split($\)
  s.executables               = s.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  s.test_files                = s.files.grep(%r{^(test|spec|features)/})
...

That's where the 'fatal' message is coming from, and since that appears to be a recommended way of writing the gemfile, that's what makes our resulting gem file empty (error from git ls-files is silently ignored). It is expected that the gem will be always built from git repository, which is not true in our case.

Again, fixing it quick and dirty way - making unpackged gem folder a git repository:

$ git init berkshelf-3.1.5
Initialized empty Git repository in /tmp/vendor/cache/berkshelf-3.1.5/.git/
$ pushd berkshelf-3.1.5
$ git add .
$ git commit -m "Dummy commit"
$ gem build berkshelf.gemspec
WARNING:  description and summary are identical
  Successfully built RubyGem
  Name: berkshelf
  Version: 3.1.5
  File: berkshelf-3.1.5.gem
$ mv berkshelf-3.1.5.gem ../
$ popd
$ ls -l berkshelf-3.1.5.gem
-rw-r--r-- 1 rye rye 105472 Oct 25 17:10 berkshelf-3.1.5.gem

Much better.

Final build

$ fpm -s gem -t rpm berkshelf-3.1.5.gem
no value for epoch is set, defaulting to nil {:level=>:warn}
no value for epoch is set, defaulting to nil {:level=>:warn}
Created package {:path=>"rubygem-berkshelf-3.1.5-1.noarch.rpm"}
$ rpm -qpR rubygem-berkshelf-3.1.5-1.noarch.rpm
...
rubygem(celluloid) >= 0.16.0
rubygem(celluloid) < 0.17.0
rubygem(celluloid-io) >= 0.16.0
rubygem(celluloid-io) < 0.17.0
...

While the original issue may be seen as a bug in FPM (will update the post if/when GitHub issue is created for that), the dependency on git for file listing may cause a bit of confusion for an unsuspected developer/release engineer.


Jenkins System Properties

I started doing much more work with jenkins lately and experiencing the void of solutions to some issues I am facing, I decided to start posting them here.

So today we are going to load some system properties on jenkins startup.

Jenkins allows Groovy hook scripts to be set up that are run early during startup or if jenkins experiences boot failure. Since these scripts use the same JVM as jenkins, we can set up a script that set up system properties directly or load from file.

Setup is simple, put jenkins.properties to your $JENKINS_HOME and create init.groovy.d there too. Put the following groovy file under init.groovy.d:

load-properties.groovy

import jenkins.model.Jenkins
import java.util.logging.LogManager

def logger = LogManager.getLogManager().getLogger("")

/* JENKINS_HOME environment variable is not reliable */
def jenkinsHome = Jenkins.instance.getRootDir().absolutePath

def propertiesFile = new File("${jenkinsHome}/jenkins.properties")

if (propertiesFile.exists()) {
    logger.info("Loading system properties from ${propertiesFile.absolutePath}")
    propertiesFile.withReader { r ->
        /* Loading java.util.Properties as defaults makes empty Properties object */
        def props = new Properties()
        props.load(r)
        props.each { key, value ->
            System.setProperty(key, value)
        }
    }
}

Now restart jenkins and observe the following output:

Sep 26, 2014 9:59:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Augmented all extensions
Sep 26, 2014 9:59:20 PM jenkins.InitReactorRunner$1 onAttained
INFO: Loaded all jobs
Sep 26, 2014 9:59:20 PM jenkins.util.groovy.GroovyHookScript execute
INFO: Executing /home/rye/.jenkins/init.groovy.d/load-properties.groovy
Sep 26, 2014 9:59:20 PM org.jenkinsci.main.modules.sshd.SSHD start
INFO: Started SSHD at port 48042
Sep 26, 2014 9:59:20 PM java.util.logging.LogManager$RootLogger log
INFO: Loading system properties from /home/rye/.jenkins/jenkins.properties
Sep 26, 2014 9:59:20 PM jenkins.InitReactorRunner$1 onAttained
INFO: Completed initialization

Visit $JENKINS_URL/systemInfo (e.g. http://localhost:8080/systemInfo) and see your system property defined.

I needed this because the certificate I got from StartSSL was not trusted by JVM by default, so I had to override trustStore by creating a new keystore ($JENKINS_HOME/.keystore), importing StartSSL Class 1 certificate, and set javax.net.ssl.trustStore=/var/lib/jenkins/.keystore system property.


Sad Acer A1 status update

This January after 3 years of horrible performance of buggy hardware and software my Acer Liquid E USB port has partially detached from its motherboard which prevented the device from being charged and accessed over USB.

Replacing the motherboard makes no sense since it's equivalent to buying another horrible broken Acer Liquid E device. Replacing 10 pin MiniUSB requires both compatible part CN 10PIN 215+916+2450 ACT and precision tools I don't have.

This brings the end to my attempts of fixing the thing that was not supposed to be broken from the start.

Acer Liquid E idle at 39.2 ℃

I've learned a lot about Android internals and kernel development. It inspired me to dig deeper and even join Samsung R&D Ukraine briefly to study embedded development, which made me realize that supporting a device without manufacturer assistance is an unthankful job.

The devices get released at an increased rate and deprecation of components brings the cost of support for existing devices prohibitively high. That means there are two purchasing options now - either an undertested or obsolete device.

Sad but true.


Shrinking Oversized Images in Liferea

I started using liferea quite a while ago for RSS feed and the only issue I encountered was the way the images were displayed if the image was larger than the window:

Liferea display before the change

By adding the following rule to ~/.config/liferea/liferea.css I got all images resized to fit the window and browsing large photos in the feeds is no longer an issue.

img {
    max-width: 100%;
    height: auto;
}
Liferea display after the change


Working With L-2 Status

Please note that I can't be held liable for any errors or omissions in the document and you will need to seek real immigration lawyer should you have any questions not answered on the USCIS/SSA websites.

TL;DR version: get EAD then SSN and that's all the documents you need to start working.

L-2 is a visa type/status issued to "a spouse of intra-company transferee". Regardless of what you read elsewhere you are NOT eligible to work anywhere unless you receive an Employment Authorization Document.

For some weird reason, SSA and DHS disagree on whether L-2 holders are eligible to work w/o EAD:

USCIS/DHS:

Spouses of L-1 workers may apply for work authorization by filing a Form I-765, Application for Employment Authorization with fee. If approved, there is no specific restriction as to where the L-2 spouse may work.

SSA:

For COAs displaying a double asterisk (**) (non-immigrant E-1, E-2, and L-2 classifications), the spouse is also authorized to work without specific DHS authorization.

A person admitted under L-2 can obtain SSN w/o EAD, the list of documents is:

  • an EAD (Form I-766) showing “A-18” under Category; or
  • evidence other than an EAD that proves the L-2’s lawful alien status (e.g., I-94) and a marriage document as evidence that he or she is the spouse of the principal L-1 alien.

However, in my case I was specifically asked for an EAD while submitting the documents for SSN, stating that otherwise I would not be eligible for receiving SSN, your mileage may vary.

Based on the DHS documents, your employer will want to see the work authorization and the I-9 form states that SSN showing "ALLOWED TO WORK ONLY WITH DHS AUTHORIZATION" is not enough.

Getting EAD

Employment Authorization Document is issued by Department of Homeland Security. While you can eFile the documents, you will still need to provide a payment (personal check or money order) and photos, so you will need to get these to the USCIS (U.S. Citizenship and Immigration Services) and the easiest way is to mail everything using the post office.

You will need to figure out where you need to send the documents based on the state you are currently in, see the instructions for your I-765 form.

Double and triple-check the contents of your mail prior to posting. Create a checklist and tick it off as you put the items into your mail, you really want to get everything done properly from the first time.

You will want to get a tracking number, so that you will be able to check the status of the message as it is traveling through the US to the lockbox facility.

Once USCIS receives your mail and checks that it is intact, you will receive a mail message, Form I-797C, Notice of Action, where you will see the current status of your case and the receipt number.

Now go to USCIS, create an account and register for e-mail notification as your case passes various stages.

When your application is approved, DHS will send you another I-797 Notice of Action, this time on a fancy watermarked paper stating that your card is being sent to you.

Here's how the card looks:

/galleries/dropbox/ead.jpg

If you signed up for e-mail notifications on the case progress, you will also receive an e-mail containing the USPS tracking number, however in my case there appears to be a template processing bug, and I was left with "#DCN" as the tracking number. I have notified the webmaster about the issue, but haven't heard anything back yet.

Change of address

EAD processing may take up to 90 days, if you happen to relocate while you are waiting for the document to arrive, you can update the address online, specifying the receipt number you received in the first "Notice of Action". When DHS updates your information they will send you a paper mail notification about the same.

Social Security Number

Once you receive your EAD, you can go to your local Social Security Administration office and apply for a Social Security Number.

You will need to provide:

  • A completed SS-5 form.
  • Your foreign passport with the L-2 visa.
  • Employment Authorization Card.

You will be given a receipt showing your name, mail address, and application date. The social security card should arrive to your mailbox within 2 weeks.

First day

As expected, on the first day of work I needed to provide my Passport and EAD. Employment quest is finished, no issues detected.


Метки в IMAP Яндекс.Почты

Письмо в поддержку:

Здравствуйте! Спасибо за отличный сервис - почтой и диском пользуюсь постоянно.

В последнее время я начал пользоваться Mozilla Thunderbird для почты и обнаружил две неисправности:

  1. В случае, если метка содержит заглавные буквы (например "Work") то при добавлении флага "work" через IMAP веб интерфейс не замечает добавления метки (cудя по RFC, флаги в IMAP должны быть регистронезависимыми).
  2. После того, как приложение ставит флаги и переподключается к серверу, в IMAP флаги пропадают, хотя на веб интерфейсе метки остаются. Во вложении находится лог обмена сообщениями между мной и сервером, а на видео http://video.yandex.ru/users/roman-yepishev/view/16/ можно увидеть, как флаг "shopping" внезапно пропадает после close/select в IMAP, оставаясь при этом в веб-интерфейсе. Это происходит только с метками, которые предварительно созданы через веб.

Из-за данных неисправностей невозможно использовать одни и те-же метки в IMAP клиенте и на web интерфейсе.

Ответ из службы поддержки:

Здравствуйте, Роман!

Наши специалисты уже занимаются решением проблемы, о которой Вы сообщаете, и постараются закончить эту работу как можно скорее. Приносим свои извинения за временные неудобства! Мы будем признательны за Ваше терпение и понимание.

Ок, подождем, вот моя переписка с IMAP сервером:

imap-flags-reset.txt

$ telnet-ssl  -z ssl imap.yandex.ru imaps
Trying 87.250.250.124...
Connected to imap.yandex.ru.
Escape character is '^]'.
* OK Yandex IMAP4rev1 at imap15g.mail.yandex.net:993 ready to talk with 24.2.252.8:42823, 2013-Dec-14 00:05:33, V5PajE3m64YO
1 login roman-yepishev "***"
1 OK LOGIN completed
1 select inbox
[...]
1 close
1 OK close complete.
1 select inbox
* FLAGS (\Answered \Seen \Draft \Deleted $Forwarded)
* 1 EXISTS
* 0 RECENT
* OK [PERMANENTFLAGS (\Answered \Seen \Draft \Flagged \Deleted $Forwarded \*)] Limited
* OK [UIDNEXT 23396] Ok
* OK [UIDVALIDITY 1274466921] Ok
1 OK [READ-WRITE] select completed
1 fetch 1 flags
* 1 FETCH (FLAGS (\Seen))
1 OK fetch completed
1 store 1 +FLAGS (shopping)
* 1 FETCH (UID 23394 FLAGS (\Seen shopping))
1 OK store completed
1 close
1 OK close complete.
1 select inbox
* FLAGS (\Answered \Seen \Draft \Deleted $Forwarded)
* 1 EXISTS
* 0 RECENT
* OK [PERMANENTFLAGS (\Answered \Seen \Draft \Flagged \Deleted $Forwarded \*)] Limited
* OK [UIDNEXT 23396] Ok
* OK [UIDVALIDITY 1274466921] Ok
1 OK [READ-WRITE] select completed
1 fetch 1 flags
* 1 FETCH (FLAGS (\Seen))
1 OK fetch completed


AppArmor config for Yandex.Disk

I've been using Yandex.Disk for quite a while for data synchronization and file sharing because of its simplicity - a standard WebDAV implementation (+ extensions for file sharing, all documented, although in Russian) allowing for different clients to be used, a nice web UI and they have introduced a Linux client recently which marries WebDAV and XMPP which is used for OOB notifications.

Being a bit cautious I decided to run it on my system but restrict access to everything else, so I wrote the following apparmor config and now it is only allowed to touch the files within ~/Yandex.Disk directory and it's configuration, put it to /etc/apparmor.d/usr.bin.yandex-disk:

usr.bin.yandex-disk

# vim:syntax=apparmor
# Author: Roman Yepishev <[email protected]>
#include <tunables/global>

/usr/bin/yandex-disk {
    #include <abstractions/base>
    #include <abstractions/nameservice>
    #include <abstractions/user-tmp>

    owner @{HOME}/.config/yandex-disk/ rw,
    owner @{HOME}/.config/yandex-disk/** rw,

# yandex-disk can add itself to autostart configuration
    owner @{HOME}/.config/autostart/Yandex.Disk.desktop rw,

# default sync location
    owner @{HOME}/Yandex.Disk/ rw,
    owner @{HOME}/Yandex.Disk/** rw,

# or change the location like this:
#   owner @{HOME}/OtherFolder/ rw,
#   owner @{HOME}/OtherFolder/** rw,

    /usr/bin/yandex-disk ixr,

    /bin/dash ixr,
}

Yandex.Disk supports symlinks, so if symlinks to other locations are used, these all should be described in the configuration file. Otherwise, the access checks will fail and you will get this in kernel log:

[77109.846335] type=1400 audit(1386173505.778:116): apparmor="DENIED" ↩
operation="open" parent=2000 profile="/usr/bin/yandex-disk" ↩
name="/home/rye/_wine.tar.gz" pid=2869 comm="yandex-disk" ↩
requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000

P.S. Yeah, I've stopped using Ubuntu One for the time being.


ATM Deposit gone bad

I had a checking account with CityBank during my stay in the US in 2007. A lot of US-based online stores wanted US-issued card only (the same goes for UK stores, same attitude towards foreign cards), so I had to physically withdraw money from my Ukrainian card and deposit it to my US account (other options were not available at that time).

So once I found out I can do the deposits without bank teller via the ATM I decided to try it immediately.

Here's my dialog with the machine:

  • What do you want to do?
  • Deposit
  • How much do you want to deposit?
  • (Huh? That does not look right, you should check how much I have deposited. Okay, let's test) $200
  • Insert bills or envelope
  • (Excuse me? An envelope? How will the ATM check the bills are genuine? Bills or envelope... ok, I will go with the bills. I insert the stack of bills into the machine hoping there's some sort of feeder and verification system in place and notice the bills simply dropped somewhere inside the machine, oops)
  • Thank you for banking with CitiBank

This happened after working hours, so I decided not to continue stuffing the ATM with my money for the time being and see whether something goes wrong.

At home I checked CitiBank onine banking system and found that I had a successfull +$200 deposit.

The next day I went to CircuitCity and purchased some things using the card, when I returned home in the evening I found out that I had -$140 balance on a debit account.

Something went wrong.

The next day I went to CitiBank branch, spent half an hour with my account manager explaining what I did, she asked around and one teller confirmed that yeah, they had $200 unaccounted in the ATM because some idiot (my word, not theirs) decided it was a good idea to shove the money into the deposit slot. Overdraft was dropped, I learned a valuable lesson and used an envelope next time.

In 2011 Citibank started switching to ATMs that count and verify the bills and no longer require these weird envelopes.


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