List gpg keys in your system

1.1. RPM based distros (RHEL, CentOS, Fedora)

Import:

$ sudo rpm --import repomd.xml.key

List:

$ rpm -q gpg-pubkey|sort

Getting info:

rpm -qi  | grep Summary   

(or without the ‘grep’ part to view full info of the key package)

To remove:

sudo rpm -e --allmatches 

Example:

[root chip ~]# rpm -q gpg-pubkey|sort
gpg-pubkey-1ac70ce6-41bebeef
gpg-pubkey-30c9ecf8-3f9da3f7
gpg-pubkey-4f2a6fd2-3f9d9d3b
gpg-pubkey-8df56d05-3e828977
gpg-pubkey-8df56d05-3e828977
gpg-pubkey-a109b1ec-3f6e28d5
gpg-pubkey-db42a60e-37ea5438
gpg-pubkey-e42d547b-3960bdf1
[root chip ~]# rpm -e --allmatches gpg-pubkey-8df56d05-3e828977
[root chip ~]# rpm -q gpg-pubkey|sort
gpg-pubkey-1ac70ce6-41bebeef
gpg-pubkey-30c9ecf8-3f9da3f7
gpg-pubkey-4f2a6fd2-3f9d9d3b
gpg-pubkey-a109b1ec-3f6e28d5
gpg-pubkey-db42a60e-37ea5438
gpg-pubkey-e42d547b-3960bdf1

1.2 Debian / Ubuntu

$ gpg --list-keys user_ID

Example:

$ gpg --list-keys
/home/iplsdk/.gnupg/pubring.gpg
-------------------------------
pub   2048R/E5****A4 2015-01-12
uid                  IBM Software Development Kit for Linux on Power
sub   2048R/F2*****9 2015-01-12

pub   4096R/78C*****4 2016-02-11
uid                  IBM SDK for Linux on Power (The IBM Software Development Kit for Linux on Power is a free Eclipse-based Integrated Development Environment) <iplsdk@linux.vnet.ibm.com>
sub   4096R/B3*****0 2016-02-1

Add a gpg-key in your environment:

After you get the .gpg file, you need to 'add-apt-key' it into your keyring. Here:
$ sudo apt-key add .gpg

Don’t forget:
$ sudo apt-get update

Cheers!

Installing vim on Fedora 25

I just booted a fresh Fedora 25 (server, ppc64le) and attempted to install vim (I do not like vi) and had the following error:

Error: Transaction check error:
 file /usr/share/man/man1/vim.1.gz from install of 
vim-common-2:8.0.133-2.fc25.ppc64le conflicts with 
file from package vim-minimal-2:7.4.1989-2.fc25.ppc64le

Cool, let’s remove vim-minimal:

$ sudo dnf remove vim-minimal

If you see what I saw, this will trigger the uninstall of a whole lot of packages, including sudo.Saying it will remove sudo can scare the bejesus out of many people, but this will not be a problem if you are logged as root. (sudo -s / sudo -su).

$ sudo -su

Now you can bravely go on: remove vim-minimal and then install vim-enhanced. You should be all good.

Cheers!

IPython (& ipdb) issue with python 2.7

If you ever wanted to use ipdb (from IPython) debugger when using Python 2.7, you might have faced an issue like this:

$ sudo pip install ipython
Downloading/unpacking ipython
  Downloading ipython-6.0.0.tar.gz (5.1MB): 5.1MB downloaded
  Running setup.py (path:/tmp/pip_build_root/ipython/setup.py) egg_info for package ipython
    
    IPython 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2.
    When using Python 2.7, please install IPython 5.x LTS Long Term Support version.
    Beginning with IPython 6.0, Python 3.3 and above is required.
...
Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/ipython

So you gotta go ahead and install IPython==5.0, because it’s the last LTS version. Do:

#pip install IPython==5.0

And then you should get:

ImportError: No module named packaging.version

Hm, that was not expected. Installing setuptools or packaging did not work for me at this moment. To get away with this error I had to install pip3 and then upgrade pip:

  251  sudo apt-get install python3-pip
  252  sudo pip3 install --upgrade pip
  253  sudo pip install ipython==5.0
  254  sudo pip install ipdb

After that, both IPython and ipdb installed with no issues or errors and life was happy again.

ALTERNATIVE SOLUTION:

If the above still does not fix the issue, or if pip and ipython are bound to python 3, you can try this, according described in the packaging.python.org website:

  1. Download get-pip.py
  2. Run python get-pip.py. [2] This will install or upgrade pip. Additionally, it will install setuptools and wheel if they’re not installed already.

Let me know if that worked for you too.

Good Luck!

How to enable git-completion on PS1 variable

A nicer bash prompt I use includes a git completion script that indicates the branch of a repository I may be into. Like this:

git_completion

Green indicates “master” is clean and no modified files are present. Red indicates there is something new in that branch.

In order to configure that, I had to include some instructions on my .bashrc file. It looks like this:

# git completion
source /usr/share/git-core/contrib/completion/git-prompt.sh

(…)

PS1='\[\e[01;30m\]\t`if [ $? = 0 ]; then echo "\[\e[32m\] ✔ "; else echo "\[\e[31m\] ✘ "; fi`\[\e[00;40;37m\]\u\[\e[01;37m\]:`[[ $(git status 2> /dev/null | head -n2 | tail -n1) != "# Changes to be committed:" ]] && echo "\[\e[31m\]" || echo "\[\e[33m\]"[[ $(git status 2> /dev/null | tail -n1) != "nothing to commit, working directory clean" ]] || echo "\[\e[32m\]"`$(__git_ps1 "(%s)\[\e[00m\]")\[\e[01;34m\]\w\[\e[00m\]\$ '

Now, sometimes (in a new environment mostly), we may configure the .bashrc just the way we want it and then:

git_2

Boom! You see a big "__git_ps1: command not found"  message.

That is because you don’t have the git-prompt.sh file you included in the directory loaded at the top of you .bashrc file (the /usr/share/git-core/contrib/completion/git-prompt.sh)

So in order to get rid of that, we need to include it. The file is available in contrib/completion/git-prompt.bash from the git repository git://git.kernel.org/pub/scm/git/git.git

So after you clone it, you should simply copy the missing files to your system file system. In my case, I preferred to copy the whole “completion” dir to my file systems, as I did not have it. So:

$ sudo cp -r completion/ /usr/share/git-core/contrib/

Now I have my git-completion.bash file in the correct place. Let’s see if that worked when running a new bash session:

git_3

Great! Worked like a charm.

Let me know if you have a different solution for it or if this did not solve your problem.

Thanks for reading.

Cheers!

Technically Speaking was used as a reference for this post.

Installing clang on RHEL/CentOS and Ubuntu

For RHEL and CentOS:

1) Install EPEL repository (read here on how to install it)

2) Install clang package:
$ sudo yum install clang

For Ubuntu 16.04:

1) Install clang packages:
$ sudo apt-get install clang libclang-dev

2) Create a symlink to libclang:
$ cd /usr/lib/-linux-gnu
$ sudo ln -s libclang-.so libclang.so

Example:
$ cd /usr/lib/powerpc64le-linux-gnu
$ sudo ln -s libclang-3.8.so libclang.so

Transfer files using SSH

The most used method to transfer files among servers is scp. However, an alternative method is by piping cat and ssh.

From your local machine, you want to send “telnet” to “hostname7.site.com“.

Issue:

# cat telnet-0.17-59.el7.ppc64.rpm | ssh root@hostname7.site.com "cat - > /root/telnet-0.17-59.el7.ppc64.rpm"
It's magic!
Cheers!