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bug#10980: 23.4; Variable init_environment incorrectly set

From: Bo Johansson
Subject: bug#10980: 23.4; Variable init_environment incorrectly set
Date: Fri, 9 Mar 2012 12:01:53 +0100

--------------------------- Background
I am used to "live" in Emacs and want to get the same result doing something from within Emacs as doing it from a Windows command prompt.
For example (compile "dmake" nil) in Emacs and executing dmake in a Windows command window should give the same result.
--------------------------- Example of Problems
Emacs replaces the environment variable SHELL at start up in Windows to something like "C:/Program Files (x86)/GNU Emacs 23.4/bin/cmdproxy.exe". Processes started by Emacs will inherit this value.
Many utilities uses SHELL. One example is:  With " ... cmdproxy.exe" as value of SHELL dmake is configured to use a Kornshell compatible shell.
--------------------------- Solution ideas
A long time goal should be to avoid changing the environment variable within Emacs. Emacs should (internally) at least not change the value of SHELL.
A short time solution is to make the initial environment variable available as stated in http://www.gnu.org/software/emacs/manual/html_node/emacs/Environment.html: "The variable initial-environment stores the initial environment inherited by Emacs".
This make it possible in
(defun compilation-start (command &optional mode name-function highlight-regexp)
to use the variable compilation-environment to temporary override the in emacs internal used environment variables.
In emacs-git/lisp/progmodes/simple.el:2088
(defun shell-command (command &optional output-buffer error-buffer)
the corresponding possibility is however not available.
--------------------------- Description of the Bug
Below follows a list of steps done at start up. The problem is that step 2) changes the environment variables before step 4) sets the variable initial_environment.
1) The function init_environment is called
#ifdef MSDOS
  /* Call early 'cause init_environment needs it.  */
  init_dosfns ();
  /* Set defaults for several environment variables.  */
  if (initialized)
    init_environment (argc, argv, skip_args);
    tzset ();
#endif /* MSDOS */
  globals_of_w32 ();
  /* Initialize environment from registry settings.  */
  init_environment (argv);
  init_ntproc ();    /* must precede init_editfns.  */
2) The function init_environment changes the environment variables
T:/emacs-git/src/w32.c:1528:init_environment (char ** argv)
Do a lot of changes to the environment variables.
3) The function set_initial_environment is called to save the "initial_environment"
  /* Initialize and GC-protect Vinitial_environment and
     Vprocess_environment before set_initial_environment fills them
     in.  */
  if (!initialized)
    syms_of_callproc ();
  /* egetenv is a pretty low-level facility, which may get called in
     many circumstances; it seems flimsy to put off initializing it
     until calling init_callproc.  Do not do it when dumping.  */
  if (initialized || ((strcmp (argv[argc-1], "dump") != 0
               && strcmp (argv[argc-1], "bootstrap") != 0)))
    set_initial_environment ();
4) The variable initial_environment is set by set_initial_environment
set_initial_environment (void)
Vinitial_environment = Fcopy_sequence (Vprocess_environment);
In GNU Emacs 23.4.1 (i386-mingw-nt6.1.7601)
of 2012-02-04 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.1.7601
configured using `configure --with-gcc (4.4) --cflags -ID:/devel/emacs/libs/libXpm-3.5.8/include -ID:/devel/emacs/libs/libXpm-3.5.8/src -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include -ID:/devel/emacs/libs/giflib-4.1.4-1/include -ID:/devel/emacs/libs/jpeg-6b-4/include -ID:/devel/emacs/libs/tiff-3.8.2-1/include'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: SVE
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t
Major mode: Lisp Interaction
Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  cua-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-fill-mode: t
Recent input:
<escape> x r e p o <tab> r <tab> <return>
Recent messages:
Loading cua-base...done
Loading paren...done
userDotEmacs Done
Finding all versions of R on your system...
Sorry, no version of R could be found on your system.
Making completion list...
Load-path shadows:
None found.
(shadow sort mail-extr message ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
time-date mm-util mail-prsvr gmm-utils mailheader canlock sha1 hex-util
hashcash mail-utils emacsbug help-mode view psvn byte-opt warnings
bytecomp byte-compile derived edmacro kmacro wid-edit log-edit pcvs-util
add-log diff-mode easy-mmode pp elp ediff-merg ediff-diff ediff-wind
ediff-mult ediff-help ediff-init ediff-util dired tex-mik preview-latex
tex-site auto-loads ess-eldoc ess-toolbar ess-mouse mouseme thingatpt
browse-url ess-menu ess-swv ess-noweb noweb-font-lock-mode ess-bugs-l
essd-els ess-sas-d ess-sas-l ess-sas-a executable shell ess-arc-d
ess-vst-d ess-xls-d ess-lsp-l ess-sta-d ess-sta-l cc-vars cc-defs
make-regexp ess-sp6w-d ess-sp4-d ess-sp3-d ess-r-d ess-r-args assoc
ess-s-l ess-inf ess-utils comint ring ess-mode noweb-mode ess ess-custom
regexp-opt ess-compat ess-site htmlize-view easymenu w32-winprint
htmlize cl cl-19 delsel server advice help-fns advice-preload paren
cua-base cus-start cus-load tooltip ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 disp-table ls-lisp w32-win w32-vars tool-bar dnd fontset
image fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mldrag mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev loaddefs button minibuffer faces cus-face files
text-properties overlay md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote make-network-process multi-tty

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