Re: git fails with control characters in trunk directory name

[Hugo Mildenberger <Hugo.Mildenberger@namir.de>]

> > I looked into guess_dir_name().
> 
> That's not the right place. The place I meant is right below the call
> to this function (you have to parse the names given in the command-line
> too).
> 
> The automatically generated (that's the case with guess_dir_name)
> directory name certainly shouldn't contain any unexpected characters.
> 
> > A regex call would be easy to fit, but
> > currently the git binary does not depend on libpcre. Is it generally
> > considered to be acceptable to add such a dependency?
> 
> No. And pcre is not the only regex lib in the world. And we prefer
> shell patterns, if any at all.
> 
> > While I like the idea to make use of a configurable regular expression, such
> > an expression had to be a command line parameter with a reasonable default
> > value, because .git/config still would not exist when the value would be
> > needed.
> 
> That's where _default_ policy plays its role. "Default" like in "it is compiled
> into the git executable and needs no configuration present".
> 
> > Last not least, I managed to reproduce the problem almost exactly:
> >
> > 1.) hm@localhost git
> > clone "git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-testing.git
> > "
> >        (Note the trailing linefeed)
> 
> That's all the command printed? No "Initialized empty Git repository" line?
> 
> > 2.) hm@localhost ~/tmp/bluetooth-testing.git $ make
> 
> Hmm... At this point the clone may have worked (at least partially).
> It named "bluetooth-testing.git", which it shouldn't (but explainable:
> the repo url suffix is not .git anymore, but ".git\r\n"). But it looks like
> the post-clone checkout failed (silently? which would be bad):
> 
> >        Makefile:313: /home/hm/tmp/bluetooth-testing.git
> >        /scripts/Kbuild.include: No such file or directory
> >        make[1]: /home/hm/tmp/bluetooth-testing.git: No such file or directory
> >        make[1]: *** No rule to make target `/home/hm/tmp/bluetooth-testing.git'.
> >        Stop.
> >        make: *** No rule to make target `include/config/auto.conf', needed by
> >        `include/config/kernel.release'.  Stop.
> 
> Assuming the files must be present, of course.
> 
> > 3.) hm@localhost ~/tmp/bluetooth-testing.git $ git pull
> >        fatal: Error in line 2:
> >
> > 4.) ".git/config" now contains
> >
> > url =
> > git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-testing.git\n
> >
> > I particulary liked the git message "fatal: Error in line 2:" ...
> >
> 
> Separate issue. Will look at it later.
> --

You really want to use shell patterns to match against a string from within a binary? Although git 
already makes use of regexec from glibc or compat/regex directory in numerous places? 

Regarding the procedure above, sorry for keeping it much too short. Here comes a 
complete sequence (I will put some comments within square brackets):

hm@localhost /var/tmp $ git --version
git version 1.6.0.6

hm@localhost /var/tmp $ git clone "git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-testing.git
"
Initialized empty Git repository in /mnt/hda1/tmp/bluetooth-testing.git
/.git/
remote: Counting objects: 1177836, done.
remote: Compressing objects: 100% (189467/189467), done.
remote: Total 1177836 (delta 982785), reused 1176855 (delta 981880)
Receiving objects: 100% (1177836/1177836), 288.16 MiB | 1288 KiB/s, done.
Resolving deltas: 100% (982785/982785), done.
Checking out files: 100% (27842/27842), done.

hm@localhost /var/tmp $ ls
bluetooth-testing.git?   [Note that question mark replacing \n in repository's name]

hm@localhost /var/tmp $ cd blue	
bluetooth-testing.git^J/ bluez-utils-2.25-r1.new/
[I typed cd blue<TAB> here, and there is the "^J" I remembered to have seen elsewhere] 

hm@localhost /var/tmp $ cd 'bluetooth-testing.git
'/ [bash puts the directory name automatically within single quotes in this case]

hm@localhost /var/tmp/bluetooth-testing.git $ make defconfig
*** Default configuration is based on 'i386_defconfig'
#
# configuration written to .config
#

hm@localhost /var/tmp/bluetooth-testing.git $ make
make[1]: /mnt/hda1/tmp/bluetooth-testing.git: No such file or directory
make[1]: *** No rule to make target `/mnt/hda1/tmp/bluetooth-testing.git'.  Stop.
make: *** No rule to make target `include/config/auto.conf', needed by `include/config/kernel.release'.  Stop.
[The problem is simply the odd directory name, while make tries to use the real one]

hm@localhost /var/tmp/bluetooth-testing.git $ git pull
fatal: Error in line 2: