--exclude-vcs
Tag Archives: OSS
Cellphone sync and linux
I once had a cellphone that played very nicely with Linux, the good old Siemens S55. Unfortunately, my SE P1i doesn’t. I tried various combinations of Multisync or OpenSync, nothing helped. Today I bit the bullet and installed funambol with syncevolution. What shall I say, apart from having to run a ~250Meg Java Application server just for me, it simply works. Period.
And thanks to Blueman, this works with Bluetooth now, too (Via PAN of course, not OBEX).
The new automake meme
Apparently a small meme has spread in the gnome community, the non-recursive automake meme.
Well, rewriting the makefiles for rygel to use the new Vala support in automake-1.11 I also converted it to be non-recursive.
This is what I got:
- Parallel builds working (but this seems to be more the work of the Vala support)
- Cleaner Makefiles, less code duplication
- No possibility to call “make install” for a single plugin only
- No to very minor speed gain
All in all, this seems less improvement than expected, but the cleanliness of the Makefile.am is worth the minor inconveniences generated by that, though it still needs some more cleanup and flags unification.
Concerning gnupg…
I wrote earlier about compiling libgpgme for use with Visual Studio. Forgot to mention that this is an useless effort because the filedescriptor passing does not work and as such you can only encrypt decrypt from or to memory.
GUPnP on windows howto
I threw together some instructions on how to build the GUPnP stack on windows:
Trekstor Vibez & Jaunty
If you use one of the famous beta firmwares for your Trekstor vibez and have jaunty installed, you may experience some weird behaviour if you plugin in your player and hope that a folder pops up showing you your device’s contents.
If you configured your device’s transfer mode to “Mass Storage only” it is likely that the device will not show up and crash on shutdown at the “Saving Settings” screen with a bold “Saving”.
Reason is: in /etc/udev/rules.d/45-libmtp7.rules
this device’s USB id is hard-wired to be an MTP device. Just comment the two lines with {idVendor}=="066f"
and everything is fine again.
On the other hand the MTP transfer mode seems to work quite well now.
Return of the struggle
If you ever wondered what parameters you could pass in that funny xmllet <GnupgKeyParms></GnupgKeyParms>
when using gpgme_op_genkey
:
The answer to that is
- in the gnupg source, file
g10/keygen.c
, line 2363 - at http://lists.gnupg.org/pipermail/gnupg-users/2007-February/030330.html
- at
doc/DETAILS
, line 716.
Eternal struggle
My current task is evaluation crypto (here: OpenPGP) solutions for Microsoft Windows; of course including GnuPG.
Well, what do I say. While there is a nice installer for GnuPG on Windows available (either here or here), try to find one for the gpgme supporting library… (including header and .lib import files for Visual Studio, that is).
You can guess… It’s all about build-your-own-stuff. It basically boils down to this:
Preparations
- Create a directory to collect all the stuff you will need (e.g.
C:\gpgme
withbin
,include
andlib
sub folders) - Get mingw and install it
- Get MSYS and install it
- Download libgpg-error and extract it
- Download gpgme and extract it
Compiling libgpg-error
- In the MSYS bash, change to the directory you extracted libgpg-error into and run
./configure --prefix=/mingw && make install
- Call
strip src/.libs/libgpg-error-0.dll src/gpg-error.exe
as MSVC can’t use gcc’s debug info anyway - Copy
src/gpg-error.exe and src/.libs/libgpg-error-0.dll
to the bin directory created above - Copy
src/.libs/libgpg-error-0.dll.def
tolib/libgpg-error-0.def
(note the renaming; otherwise your program will look for alibgpg-error-0.dll.dll
) - Open the Visual Studio Command Prompt
- Call
lib /machine:i386 /def:lib\libgpg-error-0.def /out:lib\libgpg-error-0.lib
to create the import library - Copy
include/gpg-error.h
to include
Compiling gpgme
- In the MSYS bash, run
./configure --prefix=/mingw && make
- Call
strip src/gpgme-w32spawn.exe src/.libs/libgpgme-11.dll
- Copy
src/gpgme-w32spawn.exe
tobin
Note: To use the gpgme library, this binary has to live either in the installation dir of gpg (set in windows registry keyHKLM\Software\GNU\GnuPG\Installation Directory
) or in%PROGRAMFILES%\GNU\GnuPG
. Otherwise gpgme will not work! - Copy
src/.libs/libgpgme-11.dll
to bin andsrc/.libs/libgpgme-11.dll.def
tolib/libgpgme-11.def
(Once again, note the renaming) - Call
lib /machine:i386 /def:lib\libgpgme-11.def /out:lib\libgpgme-11.lib
to create the import library - Copy
include/gpgme.h
toinclude
Optional: Creating the documentation
I was not able to create the documentation properly using cygwin so I did this on a Linux host. Install a TeX distribution of your choice as well as texinfo (for Debian Lenny this would mean installing the packages texinfo, texi2html and texlive). Call make pdf in the doc subdir to generate the PDF documentation and manually call texi2html gpgme.texi
for a HTML document.
Summary
Now you can add the lib dir to your Visual Studio linker settings and the include dir to your C/C++ common settings. To make gpgme work, be sure you have the gpgme-w32spawn.exe installed properly as noted above.
I hope this helps to guide one or another through the struggle of getting gpgme on windows.
Q&A
-
Q: gpgme does not find libgpg-error
A: You did not call
make install
after compiling it -
Q: My program is looking for
{libgpg-error-0.dll.dll|libgpgme-11.dll.dll}
A: You did not rename the .def file before calling
lib.exe
-
Q: I did everything you said, but when I run my program,
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP)
fails withGPG_ERR_INV_ENGINE
. If I check the engine info,info->version
is emptyA: First of all, check if you copied
gpgme-w32spawn.exe
to the correct directory. If this is the case, actually, I have no idea what went wrong