Downgrading a package doesn't work

[Harro van der Klauw]

$ pip-accel install xlrd==0.9.2
...
$ pip-accel install xlrd==0.7.1 --upgrade

(pip-accel) Unpacking local source distributions ..
(pip-accel) Executing command: pip install --download-cache=/home/harrovanderklauw/.pip/cache --find-links=file:///home/harrovanderklauw/.pip-accel/sources --no-index xlrd==0.7.1 --upgrade -v -v --no-install
  Ignoring indexes: http://pypi.python.org/simple/
  Downloading/unpacking xlrd==0.7.1
    Running setup.py egg_info for package xlrd
      running egg_info
      writing pip-egg-info/xlrd.egg-info/PKG-INFO
      writing top-level names to pip-egg-info/xlrd.egg-info/top_level.txt
      writing dependency_links to pip-egg-info/xlrd.egg-info/dependency_links.txt
      warning: manifest_maker: standard file '-c' not found
      reading manifest file 'pip-egg-info/xlrd.egg-info/SOURCES.txt'
      writing manifest file 'pip-egg-info/xlrd.egg-info/SOURCES.txt'
    Requested xlrd==0.7.1, but installing version 0.9.2
  Successfully downloaded xlrd
(pip-accel) Unpacked local source distributions in 0.57 seconds.
(pip-accel) Found 0 requirements in pip's output.
(pip-accel) No requirements found in pip's output, probably there's nothing to do.

As you can see it installs 0.9.2 instead of downgrading to 0.7.1!

[Harro van der Klauw]

Uninstalling (twice) and then installing will fix it

[Harro van der Klauw]

Normal pip does do this correctly if you provide the --upgrade option (without it, fails the same way)

[Peter Odding]

After much digging I found that this is not a bug in pip-accel; it's bug #709 in pip. Apparently it will be fixed in version 1.4 which is due soonish? Shall we wait and see? :-)

Edit: Wait, you're saying this does work with regular pip? I only found #709 because I tried to reproduce this issue...

Requested xlrd==0.7.1, but installing version 0.9.2

I think the above message is printed because pip is re-using the existing build directory, i.e. it's aware that what it's doing is wrong. Which is why this is such a silly bug :-s.

[Peter Odding]

In case it did work with pip but didn't work with pip-accel, you can try version 0.9.2 (just published). It contains a lot of improvements, including the fact that modules are now uninstalled before another version is installed (i.e. it should now work the same way as pip).

[Peter Odding]

Thanks for the feedback Harro. This now works as it is supposed to, so I'm closing this issue:

peter@peter-macbook> pip-accel install xlrd==0.9.2
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Unpacking local source distributions ..
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Executing command: pip install --download-cache=/home/peter/.pip/download-cache --find-links=file:///home/peter/.pip-accel/sources --build-directory=/tmp/tmpjKDQ_j --no-index xlrd==0.9.2 --no-install
Ignoring indexes: https://pypi.python.org/simple/
Downloading/unpacking xlrd==0.9.2
  Running setup.py egg_info for package xlrd
Successfully downloaded xlrd
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Unpacked local source distributions in 0.28 seconds.
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Installing from binary distributions ..
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Finished installing all requirements in 0.21 seconds.
2013-10-14 23:48:42 peter-macbook pip-accel[25727] INFO Done! Took 0.49 seconds to install 1 package.

peter@peter-macbook> pip freeze | grep xlrd
xlrd==0.9.2

peter@peter-macbook> pip-accel install xlrd==0.7.1 --upgrade
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Unpacking local source distributions ..
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Executing command: pip install --download-cache=/home/peter/.pip/download-cache --find-links=file:///home/peter/.pip-accel/sources --build-directory=/tmp/tmpUP633L --no-index xlrd==0.7.1 --upgrade --no-install
Ignoring indexes: https://pypi.python.org/simple/
Downloading/unpacking xlrd==0.7.1
  Running setup.py egg_info for package xlrd
Successfully downloaded xlrd
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Unpacked local source distributions in 0.15 seconds.
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Installing from binary distributions ..
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Uninstalled previously installed package xlrd.
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Finished installing all requirements in 0.21 seconds.
2013-10-14 23:48:54 peter-macbook pip-accel[25737] INFO Done! Took 0.36 seconds to install 1 package.

peter@peter-macbook> pip freeze | grep xlrd
xlrd==0.7.1