Tag Archives: python

Getting pypicache running on Ubuntu 10.04

Pypicache is a great way to host a local pypi repository.  Unfortunately, it took some time for me to get it working under Ubuntu 10.04.

Pypicache is written for 2.7+, and ubuntu 10.04 uses 2.6.  Lucikly, the only backwards incompatibility seems to be string formatting.  Sooooo, get a copy of pypicache source and fix all the string formatting in the py files under the pypicache directory (alternatively, clone this: https://github.com/demelziraptor/pypicache – might be out of date so check first)

Then, while in the directory with your copy of pypicache, run pip install -r requirements.txt –use-mirrors
(Or ‘make init’ if you don’t mind it downloading all the dev requirements too.)

Then ‘make runserver’ to run the server in debug mode, with the target directory /tmp/pypicache

Test the server runs ok and you can use for whatever you want to use it for (in my case, a pip proxy).  Then you can run it using ‘PYTHONPATH=. python -m pypicache.main /tmp/mypackages’

Paramiko channel hangs

When sending a command via ssh using paramiko, the script would hang. eg:

def ssh_connect(self):
    """ connects to the remote server using paramiko """
    ssh = paramiko.SSHClient()
    ssh.connect(self.hostname, self.remoteport, self.remoteuser, None, None, self.keypath)
    return ssh

def ssh_command(self, command):
    """ executes long command on remote server """
    ssh = self.ssh_connect()
    channel = ssh.invoke_shell()
    stdin = channel.makefile('wb')
    stdout = channel.makefile('rb')
    ssh_out = stdout.read()
    stdout.close(); stdin.close(); ssh.close()
    return ssh_out

command = """
    tar -zxvf {rp} || echo 'deploy-copy-untar-error {rp}'
    rm {rp} || echo 'deploy-copy-delete-error {rp}'
    echo 'deploy-copy-success {rp}'
    """.format(rp = remotepath)
ssh_out = self.ssh_command(command)

You need to add ‘exit’ to the end of the command so the channel quits and the script continues. Like so:
command = “””
tar -zxvf {rp} || echo ‘deploy-copy-untar-error {rp}’
rm {rp} || echo ‘deploy-copy-delete-error {rp}’
echo ‘deploy-copy-success {rp}’
“””.format(rp = remotepath)
sshout = self.sshcommand(command)

Paramiko on Ubuntu 10.04: GMP or MPIR library not found

Getting the following error when trying to install paramiko on Ubuntu 10.04 (python 2.6.5) with pip – because of pycrypto dependancy:

warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath

Googling this problem leads to lots of results from Mac users, not to much from Ubuntu users. I don’t have this issue on Ubuntu 11.04 (python 2.7), so I assume it’s the python version.

To fix:

apt-get install python-dev

Then try again!

Installing python pip on Ubuntu 10.04 LTS

Just a notice; if you try to apt-get install pip, it will get the wrong package.
If you try to apt-get install python-pip, it will get a very old version of pip.
Best thing to do; download and install manually: http://pypi.python.org/pypi/pip

Ubuntu 11.04 does not have this problem.



Alternatively, use apt-get install python-pip
Then upgrade it:
pip install –upgrade pip
If you do pip –version, it will probably still show 0.3.1
apt-get puts pip into /usr/bin/pip, and upgrading adds the new version to /usr/local/bin/pip (if I remember correctly), so what you can do:
mv /usr/bin/pip /usr/bin/pip-0.3.1
pip –version again should show you 1.2.1, or whatever the latest version is