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Re: [PATCH 12/19] bash prompt: use bash builtins to check whether inside git dir

From
Johannes Sixt <j.sixt@viscovery.net>
Date
May 9, 2012, 08:07 UTC
Message-ID
<4FAA25B9.3010208@viscovery.net>
In-Reply-To
<1336524290-30023-13-git-send-email-szeder@ira.uka.de>
Am 5/9/2012 2:44, schrieb SZEDER Gábor:
Show 9 quoted lines
> __git_ps1() runs the '$(git rev-parse --is-inside-git-dir)' command
> substitution to check whether we are inside a .git directory and the
> bash prompt needs to be adjusted accordingly (i.e. display 'BARE!' or
> 'GIT_DIR!').  This imposes the overhead of fork()ing a subshell and
> fork()+exec()ing a git process.
> 
> Perform this check by comparing the path to the repository and the
> current directory using only bash builtins, thereby sparing all that
> fork()+exec() overhead.
Show 6 quoted lines
> -	if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
> +	local pwd_p
> +	__git_pwd_p pwd_p
> +	# inside .git dir?
> +	if [ "$__git_dir" = "." -o \
> +			"${pwd_p#$__git_dir}" != "$pwd_p" ]; then

At this point, $__git_dir is c:/dir style, whereas $pwd_p is /c/dir style, and the intended prefix check does not trigger.

As long as $__git_dir is only used to access files, it does not matter whether it is Windows style or POSIX style. But if $__git_dir is used in a comparison, then you must make 100% sure that the involved paths are of the same vintage.

What would be lost if this patch were dropped?
-- Hannes
Previous: SZEDER GáborNext: Junio C Hamano
Message 39 of 50 in “Bash prompt speedup”
  1. 00/19 Bash prompt speedupSZEDER Gábor, May 9, 2012
  2. 01/19 tests: move code to run tests under bash into a helper librarySZEDER Gábor, May 9, 2012
  3. 02/19 tests: add tests for the bash prompt functions in the completion scriptSZEDER Gábor, May 9, 2012
  4. Johannes SixtMay 9, 2012
  5. Junio C HamanoMay 9, 2012
  6. Johannes SixtMay 10, 2012
  7. Junio C HamanoMay 9, 2012
  8. SZEDER GáborMay 9, 2012
  9. 03/19 completion: use __gitdir() in _git_log()SZEDER Gábor, May 9, 2012
  10. Junio C HamanoMay 9, 2012
  11. SZEDER GáborMay 9, 2012
  12. 04/19 completion: respect $GIT_DIRSZEDER Gábor, May 9, 2012
  13. Johannes SixtMay 9, 2012
  14. Junio C HamanoMay 9, 2012
  15. 05/19 bash prompt: don't show the prompt when .git/HEAD is unreadableSZEDER Gábor, May 9, 2012
  16. Junio C HamanoMay 9, 2012
  17. SZEDER GáborMay 9, 2012
  18. 06/19 bash prompt: return early from __git_ps1() when not in a git repositorySZEDER Gábor, May 9, 2012
  19. 07/19 completion: make __gitdir() store repository path in $__git_dirSZEDER Gábor, May 9, 2012
  20. Junio C HamanoMay 9, 2012
  21. 08/19 completion: use $__git_dir instead of $(__gitdir)SZEDER Gábor, May 9, 2012
  22. Junio C HamanoMay 9, 2012
  23. SZEDER GáborMay 9, 2012
  24. Junio C HamanoMay 9, 2012
  25. SZEDER GáborMay 9, 2012
  26. 09/19 completion: platform-specific helper function to get physical pathSZEDER Gábor, May 9, 2012
  27. Johannes SixtMay 9, 2012
  28. 10/19 completion: use bash builtins to search for repositorySZEDER Gábor, May 9, 2012
  29. Junio C HamanoMay 9, 2012
  30. SZEDER GáborMay 9, 2012
  31. Junio C HamanoMay 9, 2012
  32. 11/19 bash prompt: use bash builtins to find out current branchSZEDER Gábor, May 9, 2012
  33. Junio C HamanoMay 9, 2012
  34. SZEDER GáborMay 9, 2012
  35. Junio C HamanoMay 9, 2012
  36. SZEDER GáborMay 9, 2012
  37. Junio C HamanoMay 9, 2012
  38. 12/19 bash prompt: use bash builtins to check whether inside git dirSZEDER Gábor, May 9, 2012
  39. Johannes SixtMay 9, 2012
  40. Junio C HamanoMay 9, 2012
  41. 13/19 bash prompt: check whether inside the worktree only when necessarySZEDER Gábor, May 9, 2012
  42. 14/19 bash prompt: use bash builtins to find out current branch during rebaseSZEDER Gábor, May 9, 2012
  43. 15/19 bash prompt: use bash builtins to get detached HEAD abbrev. object nameSZEDER Gábor, May 9, 2012
  44. 16/19 bash prompt: display stash and upstream state even inside the repositorySZEDER Gábor, May 9, 2012
  45. 17/19 bash prompt: use bash builtins to check stash stateSZEDER Gábor, May 9, 2012
  46. 18/19 bash prompt: avoid command substitution when checking for untracked filesSZEDER Gábor, May 9, 2012
  47. Junio C HamanoMay 9, 2012
  48. 19/19 bash prompt: alternative git prompt without command substitutionSZEDER Gábor, May 9, 2012
  49. Andrew SayersMay 9, 2012
  50. SZEDER GáborMay 9, 2012

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