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The environment is modified in most surprising circumstances, and not all of them are under Git's control. For example, calling curl_global_init() on Windows will ensure that the CHARSET variable is set, adding one if necessary. While the previous commit worked around crashes triggered by such outside changes of the environment by relaxing the requirement that the environment be terminated by a NULL pointer, the other assumption made by `mingw_getenv()` and `mingw_putenv()` is that the environment is sorted, for efficient lookup via binary search. Let's make real sure that our environment is intact before querying or modifying it, and reinitialize our idea of the environment if necessary. With this commit, before working on the environment we look briefly for indicators that the environment was modified outside of our control, and to ensure that it is terminated with a NULL pointer and sorted again in that case. Note: the indicators are maybe not sufficient. For example, when a variable is removed, it will not be noticed. It might also be a problem if outside changes to the environment result in a modified `environ` pointer: it is unclear whether such a modification could result in a problem when `mingw_putenv()` needs to `realloc()` the environment buffer. For the moment, however, the current fix works well enough, so let's only face the potential problems when (and if!) they occur. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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Git - the stupid content tracker
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"git" can mean anything, depending on your mood.
- random three-letter combination that is pronounceable, and not
actually used by any common UNIX command. The fact that it is a
mispronunciation of "get" may or may not be relevant.
- stupid. contemptible and despicable. simple. Take your pick from the
dictionary of slang.
- "global information tracker": you're in a good mood, and it actually
works for you. Angels sing, and a light suddenly fills the room.
- "goddamn idiotic truckload of sh*t": when it breaks
Git is a fast, scalable, distributed revision control system with an
unusually rich command set that provides both high-level operations
and full access to internals.
Git is an Open Source project covered by the GNU General Public
License version 2 (some parts of it are under different licenses,
compatible with the GPLv2). It was originally written by Linus
Torvalds with help of a group of hackers around the net.
Please read the file INSTALL for installation instructions.
See Documentation/gittutorial.txt to get started, then see
Documentation/giteveryday.txt for a useful minimum set of commands, and
Documentation/git-commandname.txt for documentation of each command.
If git has been correctly installed, then the tutorial can also be
read with "man gittutorial" or "git help tutorial", and the
documentation of each command with "man git-commandname" or "git help
commandname".
CVS users may also want to read Documentation/gitcvs-migration.txt
("man gitcvs-migration" or "git help cvs-migration" if git is
installed).
Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.
The user discussion and development of Git take place on the Git
mailing list -- everyone is welcome to post bug reports, feature
requests, comments and patches to git@vger.kernel.org (read
Documentation/SubmittingPatches for instructions on patch submission).
To subscribe to the list, send an email with just "subscribe git" in
the body to majordomo@vger.kernel.org. The mailing list archives are
available at http://news.gmane.org/gmane.comp.version-control.git/,
http://marc.info/?l=git and other archival sites.
The maintainer frequently sends the "What's cooking" reports that
list the current status of various development topics to the mailing
list. The discussion following them give a good reference for
project status, development direction and remaining tasks.