[PATCH v4 0/1] git-gui: respect core.hooksPath, falling back to .git/hooks

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This is yet another patch from Git for Windows.

Changes since v3:

 * Adjusted the commit message to reflect that this is no longer only about
   the hooks directory.
 * Added a code comment to indicate how the list of keys was determined that
   are used for the gitdir priming.
 * The gitdir cache is now re-primed upon F5.

Changes since v2:

 * The paths returned by git rev-parse --git-path are now cached, and the
   cache is primed with the most common paths.

Changes since v1:

 * Rather than a fine-grained override of gitdir just for the hooks path, we
   now spawn git rev-parse --git-path [...] every time gitdir is called with
   arguments. This makes the code safer, although at the cost of potentially
   many spawned processes.

Johannes Schindelin (1):
  Make gitdir work with worktrees, respect core.hooksPath, etc

 git-gui.sh | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 4 deletions(-)


base-commit: 60c60b627e81bf84e1cb01729d2ae882178f079d
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-361%2Fdscho%2Fgit-gui-hooks-path-v4
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-361/dscho/git-gui-hooks-path-v4
Pull-Request: https://github.com/gitgitgadget/git/pull/361

Range-diff vs v3:

 1:  65c2fa33e1 ! 1:  2f55d6fb2a Fix gitdir e.g. to respect core.hooksPath
     @@ -1,17 +1,21 @@
      Author: Johannes Schindelin <Johannes.Schindelin@xxxxxx>
      
     -    Fix gitdir e.g. to respect core.hooksPath
     +    Make gitdir work with worktrees, respect core.hooksPath, etc
      
     -    Since v2.9.0, Git knows about the config variable core.hookspath
     -    that allows overriding the path to the directory containing the
     -    Git hooks.
     +    Since v2.9.0, Git knows about the config variable core.hookspath that
     +    allows overriding the path to the directory containing the Git hooks.
      
     -    Since v2.10.0, the `--git-path` option respects that config
     -    variable, too, so we may just as well use that command.
     +    Since v2.10.0, the `--git-path` option respects that config variable,
     +    too, so we may just as well use that command.
     +
     +    Other paths inside `.git` are equally subject to differ from
     +    `<gitdir>/<path>`, i.e. inside worktrees, where _some_ paths live in the
     +    "gitdir" and some live in the "commondir" (i.e. the "gitdir" of the main
     +    worktree).
      
          For Git versions older than v2.5.0 (which was the first version to
     -    support the `--git-path` option for the `rev-parse` command), we
     -    simply fall back to the previous code.
     +    support the `--git-path` option for the `rev-parse` command), we simply
     +    fall back to the previous code.
      
          An original patch handled only the hooksPath setting, however, during
          the code submission it was deemed better to fix all call to the `gitdir`
     @@ -19,7 +23,9 @@
      
          To avoid spawning a gazillion `git rev-parse --git-path` instances, we
          cache the returned paths, priming the cache upon startup in a single
     -    `git rev-parse invocation` with the known entries.
     +    `git rev-parse invocation` with some paths (that have been
     +    determined via a typical startup and via grepping the source code for
     +    calls to the `gitdir` function).
      
          This fixes https://github.com/git-for-windows/git/issues/1755
      
     @@ -48,6 +54,8 @@
      +
      +	# `--git-path` is only supported since Git v2.5.0
      +	if {[package vcompare $::_git_version 2.5.0] >= 0} {
     ++		# This list was generated from a typical startup as well as from
     ++		# grepping through Git GUI's source code.
      +		set gitdir_keys [list \
      +			CHERRY_PICK_HEAD FETCH_HEAD GITGUI_BCK GITGUI_EDITMSG \
      +			GITGUI_MSG HEAD hooks hooks/prepare-commit-msg \
     @@ -106,3 +114,21 @@
       		set _prefix [git rev-parse --show-prefix]
       	} err]} {
       	load_config 1
     +@@
     + 	global HEAD PARENT MERGE_HEAD commit_type
     + 	global ui_index ui_workdir ui_comm
     + 	global rescan_active file_states
     +-	global repo_config
     ++	global repo_config _gitdir_cache
     + 
     + 	if {$rescan_active > 0 || ![lock_index read]} return
     + 
     ++	# Only re-prime gitdir cache on a full rescan
     ++	if {$after ne "ui_ready"} {
     ++		array unset _gitdir_cache
     ++		prime_gitdir_cache
     ++	}
     ++
     + 	repository_state newType newHEAD newMERGE_HEAD
     + 	if {[string match amend* $commit_type]
     + 		&& $newType eq {normal}

-- 
gitgitgadget



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