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authorVincent Ambo <tazjin@google.com>2020-05-22T16·46+0100
committerVincent Ambo <tazjin@google.com>2020-05-22T16·46+0100
commit5229c9b232de5bfa959ad6ebbb4c8192ac513352 (patch)
tree8539e7e23682cac110900f946f034ae44162cacd /third_party/git/Documentation/technical/api-setup.txt
parentf2b211131f2347342dde63975b09cf603149f1a3 (diff)
parent8518a7a51faaf50f830646d4c3585f51236b9349 (diff)
merge(3p/git): Merge git upstream at v2.26.2 r/808
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-setup API
-=========
-
-Talk about
-
-* setup_git_directory()
-* setup_git_directory_gently()
-* is_inside_git_dir()
-* is_inside_work_tree()
-* setup_work_tree()
-
-(Dscho)
-
-Pathspec
---------
-
-See glossary-context.txt for the syntax of pathspec. In memory, a
-pathspec set is represented by "struct pathspec" and is prepared by
-parse_pathspec(). This function takes several arguments:
-
-- magic_mask specifies what features that are NOT supported by the
-  following code. If a user attempts to use such a feature,
-  parse_pathspec() can reject it early.
-
-- flags specifies other things that the caller wants parse_pathspec to
-  perform.
-
-- prefix and args come from cmd_* functions
-
-parse_pathspec() helps catch unsupported features and reject them
-politely. At a lower level, different pathspec-related functions may
-not support the same set of features. Such pathspec-sensitive
-functions are guarded with GUARD_PATHSPEC(), which will die in an
-unfriendly way when an unsupported feature is requested.
-
-The command designers are supposed to make sure that GUARD_PATHSPEC()
-never dies. They have to make sure all unsupported features are caught
-by parse_pathspec(), not by GUARD_PATHSPEC. grepping GUARD_PATHSPEC()
-should give the designers all pathspec-sensitive codepaths and what
-features they support.
-
-A similar process is applied when a new pathspec magic is added. The
-designer lifts the GUARD_PATHSPEC restriction in the functions that
-support the new magic. At the same time (s)he has to make sure this
-new feature will be caught at parse_pathspec() in commands that cannot
-handle the new magic in some cases. grepping parse_pathspec() should
-help.