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+To: Jed Brown <jed@59A2.org>, notmuch@notmuchmail.org\r
+From: Justus Winter <4winter@informatik.uni-hamburg.de>\r
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+Message-ID: <20130409141333.7736.41695@thinkbox.jade-hamburg.de>\r
+User-Agent: alot/0.3.3+\r
+Subject: Re: [RFC/PATCH] python: search parent lib directory for libnotmuch.so\r
+Date: Tue, 09 Apr 2013 16:13:33 +0200\r
+Cc: Sebastian Spaeth <Sebastian@SSpaeth.de>\r
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+\r
+Hi Jed,\r
+\r
+Quoting Jed Brown (2013-04-09 04:47:26)\r
+> If libnotmuch.so is installed to a path that is not searched by\r
+> dlopen(3), we must import it using an absolute path because the Python\r
+> bindings do not have the luxury of RPATH linking. So strip off the\r
+> trailing directories from the install location and try CDLL with an\r
+> absolute path.\r
+\r
+May I ask why you cannot use LD_LIBRARY_PATH? I too install libnotmuch\r
+to a non-standard location as unprivileged user and to make this\r
+library available I add its path to LD_LIBRARY_PATH. It seems to work\r
+just fine:\r
+\r
+teythoon@thinkbox ~ % python -c 'import notmuch; print("\n".join(l.strip() =\r
+for l in open("/proc/self/maps") if "notmuch" in l))'\r
+7f4214339000-7f4214357000 r-xp 00000000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+7f4214357000-7f4214557000 ---p 0001e000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+7f4214557000-7f4214559000 rw-p 0001e000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+teythoon@thinkbox ~ % python3.2 -c 'import notmuch; print("\n".join(l.strip=\r
+() for l in open("/proc/self/maps") if "notmuch" in l))'\r
+7fa5ecea4000-7fa5ecec2000 r-xp 00000000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+7fa5ecec2000-7fa5ed0c2000 ---p 0001e000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+7fa5ed0c2000-7fa5ed0c4000 rw-p 0001e000 00:17 2120750 /h=\r
+ome/teythoon/.local/stow/notmuch/lib/libnotmuch.so.3.0.0\r
+teythoon@thinkbox ~ % env | grep '\.local'\r
+PATH=3D/home/teythoon/.local/bin:/usr/local/stow/enlightenment/bin:/usr/loc=\r
+al/bin:/usr/bin:/bin:/usr/games\r
+LOCAL=3D/home/teythoon/.local\r
+PYTHONPATH=3D/home/teythoon/.local/lib/python2.7/site-packages\r
+LD_LIBRARY_PATH=3D/home/teythoon/.local/lib\r
+PKG_CONFIG_PATH=3D/home/teythoon/.local/lib/pkgconfig\r
+teythoon@thinkbox ~ % unset LD_LIBRARY_PATH\r
+teythoon@thinkbox ~ % python -c 'import notmuch; print("\n".join(l.strip() =\r
+for l in open("/proc/self/maps") if "notmuch" in l))'\r
+7fd30b43c000-7fd30b457000 r-xp 00000000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+7fd30b457000-7fd30b657000 ---p 0001b000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+7fd30b657000-7fd30b658000 rw-p 0001b000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+teythoon@thinkbox ~ % python3.2 -c 'import notmuch; print("\n".join(l.strip=\r
+() for l in open("/proc/self/maps") if "notmuch" in l))'\r
+7fadb5704000-7fadb571f000 r-xp 00000000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+7fadb571f000-7fadb591f000 ---p 0001b000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+7fadb591f000-7fadb5920000 rw-p 0001b000 fe:00 4241 /u=\r
+sr/lib/libnotmuch.so.3.0.0\r
+\r
+> ---\r
+> This is sort of a hack, but I don't know a less intrusive way to get\r
+> libnotmuch.so from somewhere dlopen(3) doesn't already search.\r
+> =\r
+\r
+> The absolute path version won't do the right thing in case of 'setup.py\r
+> develop', otherwise we could use it in all cases. It may still make\r
+> sense to make the absolute path version take precedence.\r
+\r
+Well, if something like this is necessary and wanted (opinions\r
+anyone?) at least let's not hardcode the assumption about the\r
+directory layout but just walk up the tree until we find notmuch.so.3\r
+or lib/notmuch.so.3. This way the bindings will find the correct\r
+library even when they are included directly from within the source\r
+tree.\r
+\r
+Otoh, adding such behavior might be 'surprising' and lead to many\r
+problems down the road like spurious bug reports just because the\r
+magic library finder locates a rogue libnotmuch.so.3 somewhere.\r
+\r
+> An alternative would be to find libnotmuch.so using the notmuch\r
+> executable.\r
+\r
+How would you do that? fork'ing and exec'ing is not an option (and I'm\r
+not sure what one could achieve by exec'ing it, but how else would you\r
+talk to the dynamic linker?) , and poking around in binaries to get\r
+their rpath isn't either in my opinion. And you would have to locate\r
+the 'right' binary in the first place?\r
+\r
+Cheers,\r
+Justus\r
projects / notmuch-archives.git / commitdiff