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Old 07-31-2014, 10:04 AM   #1
steve_s
LQ Newbie
 
Registered: Sep 2007
Posts: 13

Rep: Reputation: 1
Updating python broke Yum & RPM


Hello,

I am running Linux 3.15.5-200.fc20.x86_64.

I updated Python2 to 2.7 by Yum, and installed Python3 v3.3 from source, before I discovered I could no longer use Yum. The python installations are in

Code:
  /usr/lib/python2.7
  /usr/lib/python3.3
The symblic links in /usr/bin had changed to point to python3, so I restored the links as follows

Code:
  /usr/bin/python -> /usr/bin/python2
  /usr/bin/python2 -> /usr/bin/python2.7
  /usr/bin/python3 -> /usr/bin/python3.3
This did not mend it. I tried to uninstall/reinstall Python & Yum through RPM, found that RPM is also broken. rpm -q and rpm -e hang with ps showing process status 'S', interruptible sleep. rpm --help and rpm --version work and exit cleanly.

I edited the !#/usr/bin/python lines to read !#/usr/bin/python2 in all the files that I could find to do with Yum and RPM that invoke Python,

Code:
  /usr/bin/yum
  /usr/share/yum-cli/*.py
  /usr/lib/python2.7/site-packages/rpmUtils/transaction.py
then ran python2 -m compileall, to update *.pyc. This did not mend it, so I restored the these files to their original state. I tried to install rpm from source but ran up against nss dependencies

So I have broken Yum and I can't use rpm to mend it, since that too is broken. Can anyone advise please?
 
Old 07-31-2014, 02:24 PM   #2
John VV
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Registered: Aug 2005
Location: A2 area Mi.
Posts: 17,400

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run "make uninstall" on the python3 source
and manually reinstall the default python rpm's
yum MUST!!!!!!! have the default 2.7 installed !!!!!!!!

but
you can run a newer version side by side

and python3 IS in the fedora repos ( and will install without KILLING yum)

there was no need to use a source build



the python27 rpm is in the updates
a link to a mirror -- 64 bit
http://mirror.pnl.gov/fedora/linux/updates/20/x86_64/
python-2.7.5-13.fc20.x86_64.rpm

File-roller can extract the files in the rpm
copy/paste them to there locations

Last edited by John VV; 07-31-2014 at 02:29 PM.
 
1 members found this post helpful.
Old 07-31-2014, 03:34 PM   #3
steve_s
LQ Newbie
 
Registered: Sep 2007
Posts: 13

Original Poster
Rep: Reputation: 1
Thanks John VV, I have now tried what you suggest, but the 3.3.2 Makefile has no uninstall target.
I can find no reference on Python website to uninstalling Python.

I tried installing 2.7.8 from source, to see if I could overwrite the damage, but got no solution.
Incredibly, the 2.7.8 Makefile has no uninstall target either, and no reference to anything that I
can identify as being like uninstall.

The only help I read about is to use the package managers, but since Yum & RPM are out of order I
am at a loss.

I straced an rpm operation to see if python was the obvious problem. The last lines of the tracefile was

Code:
open("/var/lib/rpm/.dbenv.lock", O_RDWR|O_CREAT, 0644) = 3
umask(022)                              = 022
fcntl(3, F_SETLKW, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}
.. which I guess to be trying to do something with locks on the rpm database

I straced a yum operation and got

Code:
open("/var/lib/rpm/.dbenv.lock", O_RDWR|O_CREAT, 0644) = 3
umask(022)                              = 022
fcntl(3, F_SETLKW, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}
.. not surprisingly, hung in the same place. I don't know if this gets me anywhere. I am fishing
in unknown waters now.

Checked out what was causing the lock, it was dnf. I killed the dnf process, removed dnf from systemctl,
and tried both the rpm and yum operations again. No file locks anymore, but the tracefile on both end
as follows

Code:
mmap(NULL, 286720, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0) = 0x7f11e1432000
sched_yield()                           = 0
futex(0x7f11e1432334, FUTEX_WAIT, 11, NULL
.. which I understand is an incomplete system call futex(). Something about locking and releasing
shared memory resources?

Quote:
splash splash, it's dark in here!
Steve S

Last edited by steve_s; 07-31-2014 at 04:10 PM. Reason: extra info
 
Old 07-31-2014, 04:03 PM   #4
jefro
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Registered: Mar 2008
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http://elastic-computing.blogspot.co...s-without.html

This may offer clues to fix. As to where updates and installs went on your system I can't say. It may be that all versions are overlapping in some ways.
 
1 members found this post helpful.
Old 07-31-2014, 05:17 PM   #5
steve_s
LQ Newbie
 
Registered: Sep 2007
Posts: 13

Original Poster
Rep: Reputation: 1
Talking

Thanks Jefro. I ran make install on 2.4.6, make altinstall on 2.7.8 amd make altinstall on 3.3.2
The links to executables now are

Code:
python -> python2.4
python2 -> python2.7
python3 -> python3.3
The libraries now are

Code:
/usr/local/lib/python2.4
/usr/local/lib/python2.7
/usr/local/lib/python3.3
Now, this seems like a coherent setup. python/2/3 -V all point to the right versions, but still no yum and no rpm.

Steve S.

.... update ....

Just rebooted & pow! up pops my fairy god-mother, with that "I'll give you three wishes" routine.
Wish number one was easy ...

RPM & YUM both now working

Thanks John VV. Thanks jefro.

Steve S

Last edited by steve_s; 07-31-2014 at 05:31 PM. Reason: extra info
 
  


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