On Fri, Mar 4, 2016 at 9:22 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > On Friday 04 March 2016 07:18:57 Larry Martell wrote: > >> On Thu, Mar 3, 2016 at 10:32 PM, Larry Martell > <larry.mart...@gmail.com> wrote: >> > On Thu, Mar 3, 2016 at 4:58 PM, Chris Angelico <ros...@gmail.com> > wrote: >> >> On Fri, Mar 4, 2016 at 8:38 AM, MRAB <pyt...@mrabarnett.plus.com> > wrote: >> >>> Is it even possible to zip a link? >> >>> >> >>> A quick search came up with this: >> >>> >> >>> Are hard links possible within a zip archive? >> >>> http://stackoverflow.com/questions/8859616/are-hard-links-possible >> >>>-within-a-zip-archive >> >> >> >> Hard links are different. Symlinks are files containing the target >> >> filename, with a special mode bit set. I'm not sure if it's a >> >> standard feature of all zip archivers, but on my Debian system, I >> >> can use "zip --symlinks" to create such a zip. How that will unzip >> >> on a system that doesn't understand symlinks, I don't know. >> >> >> >> rosuav@sikorsky:~/tmp$ ls -l >> >> total 4 >> >> -rw-r--r-- 1 rosuav rosuav 162 Mar 4 08:48 aaa.zip >> >> lrwxrwxrwx 1 rosuav rosuav 4 Mar 4 08:49 qwer -> asdf >> >> rosuav@sikorsky:~/tmp$ unzip -l aaa.zip >> >> Archive: aaa.zip >> >> Length Date Time Name >> >> --------- ---------- ----- ---- >> >> 4 2016-03-04 08:45 qwer >> >> --------- ------- >> >> 4 1 file >> >> >> >> >> >> That's a broken symlink (there is no "asdf" in the directory), and >> >> zip and unzip are both fine with that. >> >> >> >> Now, how the Python zipfile module handles this, I don't know. The >> >> ZipInfo shows a file mode of 'lrwxrwxrwx', but when I call >> >> extract(), it comes out as a regular file. You might have to do >> >> some work manually, or else just drop to an external command with >> >> --symlinks. >> > >> > Thanks. That's what I ended up doing. >> >> Unfortunately very slow - around 8 minutes to zip a 7GB dir using the >> command line zip vs. 13 seconds with the python zipfile module. > > Obviously the python version is not doing very much, or has enough python > magic in it to be truely called magic. In any case Larry, the operative > phrase for any of the various compression methods is TANSTAAFL. > > To generate a compressed archive of 7GB of data, is going to take time, > and I don't care what size that compressors dictionary block is. 13 > seconds is simply not a believeable figure. > > I also note carefully that no one has allowed as to what exactly this > python version does do. Thats scary...
I clearly did not have enough coffee when I wrote that (it was 7am - if I had written it at 7pm I would have said I clearly had had too much gin ;-). Anyway, I checked again and it was 2 minutes. But still much faster then the command line zip. -- https://mail.python.org/mailman/listinfo/python-list
