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Author	SHA1	Message	Date
Jeff King	2b5ed37365	add chdir-notify API If one part of the code does a permanent chdir(), then this invalidates any relative paths that may be held by other parts of the code. For example, setup_work_tree() moves us to the top of the working tree, which may invalidate a previously stored relative gitdir. We've hacked around this case by teaching setup_work_tree() to re-run set_git_dir() with an adjusted path, but this stomps all over the idea of module boundaries. setup_work_tree() shouldn't have to know all of the places that need to be fed an adjusted path. And indeed, there's at least one other place (the refs code) which needs adjusting. Let's provide an API to let code that stores relative paths "subscribe" to updates to the current working directory. This means that callers of chdir() don't need to know about all subscribers ahead of time; they can simply consult a dynamically built list. Note that our helper function to reparent relative paths uses the simple remove_leading_path(). We could in theory use the much smarter relative_path(), but that led to some problems as described in `41894ae3a3` (Use simpler relative_path when set_git_dir, 2013-10-14). Since we're aiming to replace the setup_work_tree() code here, let's follow its lead. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>	7 years ago

Jeff King

2b5ed37365

add chdir-notify API

If one part of the code does a permanent chdir(), then this
invalidates any relative paths that may be held by other
parts of the code. For example, setup_work_tree() moves us
to the top of the working tree, which may invalidate a
previously stored relative gitdir.

We've hacked around this case by teaching setup_work_tree()
to re-run set_git_dir() with an adjusted path, but this
stomps all over the idea of module boundaries.
setup_work_tree() shouldn't have to know all of the places
that need to be fed an adjusted path. And indeed, there's at
least one other place (the refs code) which needs adjusting.

Let's provide an API to let code that stores relative paths
"subscribe" to updates to the current working directory.
This means that callers of chdir() don't need to know about
all subscribers ahead of time; they can simply consult a
dynamically built list.

Note that our helper function to reparent relative paths
uses the simple remove_leading_path(). We could in theory
use the much smarter relative_path(), but that led to some
problems as described in 41894ae3a3 (Use simpler
relative_path when set_git_dir, 2013-10-14). Since we're
aiming to replace the setup_work_tree() code here, let's
follow its lead.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

7 years ago

1 Commits (449fa5ee06906ca6d109e06b14cb4f8ea60a6c88)