run_external_diff: use an argv_array for the command line

We currently generate the command-line for the external
command using a fixed-length array of size 10. But if there
is a rename, we actually need 11 elements (10 items, plus a
NULL), and end up writing a random NULL onto the stack.

Rather than bump the limit, let's just use an argv_array, which
makes this sort of error impossible.

Noticed-by: Max L <infthi.inbox@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
run_external_diff: use an argv_array for the environment

We currently use static buffers and a static array for
formatting the environment passed to the external diff.
There's nothing wrong in the code, but it is much easier to
verify that it is correct if we use a dynamic argv_array.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
run_external_diff: clean up error handling

When the external diff reports an error, we try to clean up
and die. However, we can make this process a bit simpler:

  1. We do not need to bother freeing memory, since we are
     about to exit.  Nor do we need to clean up our
     tempfiles, since the atexit() handler will do it for
     us. So we can die as soon as we see the error.

  3. We can just call die() rather than fprintf/exit. This
     does technically change our exit code, but the exit
     code of "1" is not meaningful here. In fact, it is
     probably wrong, since "1" from diff usually means
     "completed successfully, but there were differences".

And while we're there, we can mark the error message for
translation, and drop the full stop at the end to make it
more like our other messages.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
run_external_diff: drop fflush(NULL)

This fflush was added in d5535ec (Use run_command() to spawn
external diff programs instead of fork/exec., 2007-10-19),
because flushing buffers before forking is a good habit.

But later, 7d0b18a (Add output flushing before fork(),
2008-08-04) added it to the generic run-command interface,
meaning that our flush here is redundant.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
run_external_diff: hoist common bits out of conditional

Whether we have diff_filespecs to give to the diff command
or not, we always are going to run the program and pass it
the pathname. Let's pull that duplicated part out of the
conditional to make it more obvious.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
run_external_diff: refactor cmdline setup logic

The current logic makes it hard to see what gets put onto
the command line in which cases. Pulling out a helper
function lets us see that we have two sets of file data, and
the second set either uses the original name, or the "other"
renamed/copy name.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-gui: describe gui.displayuntracked

Signed-off-by: Max Kirillov <max@max630.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fast-export: improve argument parsing

We don't want to pass arguments specific to fast-export to
setup_revisions.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fast-export: add new --refspec option

So that we can convert the exported ref names.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
transport-helper: add support for old:new refspec

By using fast-export's new --refspec option.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
transport-helper: add support to push symbolic refs

For example 'HEAD'.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fast-import: add support to delete refs

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
fast-export: add support to delete refs

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
transport-helper: add support to delete branches

For remote-helpers that use 'export' to push.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
transport-helper: remove unnecessary strbuf resets

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-helpers: squelch python import exceptions

When the python modules are not present we get an unwanted message:

    *** prove ***
    test-bzr.sh .. Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/local/buildtools/current/sitecustomize/sitecu...
        return real_import(name, globals, locals, fromlist, level)
    ImportError: No module named bzrlib
    test-bzr.sh .. skipped: skipping remote-bzr tests; bzr not available
    Files=1, Tests=0,  0 wallclock secs ( 0.03 usr  0.00 sys +  0.02 ...

Squelch that output.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-helpers: move out of contrib

The remote-helpers in contrib/remote-helpers have proved to work, be
reliable, and stable. It's time to move them out of contrib, and be
distributed by default.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-helpers: move tests out of contrib

They should be tested by default.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git.c: treat RUN_SETUP_GENTLY and RUN_SETUP as mutually exclusive

This saves us a few branches when RUN_SETUP is set up.

Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-prompt.sh: don't put unsanitized branch names in $PS1

Both bash and zsh subject the value of PS1 to parameter expansion,
command substitution, and arithmetic expansion.  Rather than include
the raw, unescaped branch name in PS1 when running in two- or
three-argument mode, construct PS1 to reference a variable that holds
the branch name.  Because the shells do not recursively expand, this
avoids arbitrary code execution by specially-crafted branch names such
as '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)'.

Signed-off-by: Richard Hansen <rhansen@bbn.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>