Many tests didn't change back from subdirectories at the end of the tests ...
and they don't have to. The missing 'cd ..' could always be added when another
test case is added to the test file.
This change do that tests (99.5%) consistently end up in $TESTDIR where they
started, thus making it simpler to extend them or move them around.
Before, a tempfile was used to create a temp file was created with 600
permissions and the uploaded data was written into it. This file was
then *copied* to .hg/largefiles/<hash>.
We now simply use atomictempfile to write the data to a temp file with
the right permissions and then rename that into place.
This replaces another use of tempfile with atomictempfile. The problem
with tempfile is that it creates files with 600 permissions instead of
respecting repo.store.createmode.
Before, the mode was copied from the file in the working copy. This is
inconsistent with how Mercurial normally creates files inside the .hg
folder. This can lead to a situation where you can read the files
under .hg/store but not under .hg/largefiles and so a clone will fail
if it needs to access a largefile.
When the user pulls from a remote repository that is not his default repo, it
is quite likely that he will pull a new head. This means that if he tries to
merge or rebase with the other head, he will run into a problem becuase
largefiles has no way of tracking where the remote repository for this other
head is, so it cannot download the largefiles from this other remote repository.
It will attempt to download them from its default remote repository, which will
not yet contain the largefiles.
This patch solves this problem by caching any new largefiles for all heads
directly into the system cache at the time of the pull, so they are available
later.
This behavior is actually more in line with Mercurial's distributed nature,
because pulling already implies we have a connection to the remote server, but
merging or rebasing does not.
"hg status" may treat cache missed largefiles as "removed" incorrectly.
assumptions for problem case:
- there is no cache for largefile "L"
- at first, update working directory to the revision in which "L" is
not yet added,
- then, update working directory to the revision in which "L" is
already added
and now, "hg status" treats "L" as "removed".
current implementation does not allocate entry for cache missed
largefile in ".hg/largefiles/dirstate", but files without
".hg/largefiles/dirstate" entry are treated as "removed" by largefiles
extension.
"hg revert" can not recover from this situation, but "rm -rf
.hg/largefiles", because it causes dirstate rebuilding.
this patch invokes normallookup() for cache missed largefiles to
allocate entry in ".hg/largefiles/dirstate", so "hg status" can treat
it as "missing" correctly.
