procutil: make stream detection in make_line_buffered more correct and strict
In make_line_buffered(), we don’t want to wrap the stream if we know that lines
get flushed to the underlying raw stream already.
Previously, the heuristic was too optimistic. It assumed that any stream which
is not an instance of io.BufferedIOBase doesn’t need wrapping. However, there
are buffered streams that aren’t instances of io.BufferedIOBase, like
Mercurial’s own winstdout.
The new logic is different in two ways:
First, only for the check, if unwraps any combination of WriteAllWrapper and
winstdout.
Second, it skips wrapping the stream only if it is an instance of io.RawIOBase
(or already wrapped). If it is an instance of io.BufferedIOBase, it gets
wrapped. In any other case, the function raises an exception. This ensures
that, if an unknown stream is passed or we add another wrapper in the future,
we don’t wrap the stream if it’s already line buffered or not wrap the stream
if it’s not line buffered. In fact, this was already helpful during development
of this change. Without it, I possibly would have forgot that WriteAllWrapper
needs to be ignored for the check, leading to unnecessary wrapping if stdout is
unbuffered.
The alternative would have been to always wrap unknown streams. However, I
don’t think that anyone would benefit from being less strict. We can expect
streams from the standard library to be subclassing either io.RawIOBase or
io.BufferedIOBase, so running Mercurial in the standard way should not regress
by this change. Py2exe might replace sys.stdout and sys.stderr, but that
currently breaks Mercurial anyway and also these streams don’t claim to be
interactive, so this function is not called for them.
===================================================================
Test merge behavior with narrow for item outside of the narrow spec
===================================================================
This test currently check for simple "outside of narrow" merge case. I suspect
there might be more corner case that need testing, so extending this tests, or
replacing it by a more "generative" version, comparing behavior with and without narow.
This the feature is currently working with flat manifest only. This is the only
case tested. Consider using test-case if tree start supporting this case of
merge.
Create some initial setup
$ . "$TESTDIR/narrow-library.sh"
$ hg init server
$ echo root > server/root
$ mkdir server/inside
$ mkdir server/outside
$ echo babar > server/inside/inside-change
$ echo pom > server/outside/outside-changing
$ echo arthur > server/outside/outside-removed
$ hg -R server add server/
adding server/inside/inside-change
adding server/outside/outside-changing
adding server/outside/outside-removed
adding server/root
$ hg -R server commit -m root
$ hg clone ssh://user@dummy/server client --narrow --include inside
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets a0c415d360e5
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
"trivial" change outside of narrow spec on the server
$ echo zephir > server/outside/outside-added
$ hg -R server add server/outside/outside-added
$ echo flore > server/outside/outside-changing
$ hg -R server remove server/outside/outside-removed
$ hg -R server commit -m "outside change"
Merge them with some unrelated local change
$ echo celeste > client/inside/inside-change
$ hg -R client commit -m "inside change"
$ hg -R client pull
pulling from ssh://user@dummy/server
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files (+1 heads)
new changesets f9ec5453023e
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg -R client merge
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg -R client ci -m 'merge changes'
$ hg -R client push -r .
pushing to ssh://user@dummy/server
searching for changes
remote: adding changesets
remote: adding manifests
remote: adding file changes
remote: added 2 changesets with 1 changes to 1 files
Checking result
---------------
general sentry of all output
$ hg --repository server manifest --debug --rev 0
360afd990eeff79e4a7f9f3ded5ecd7bc2fd3b59 644 inside/inside-change
7db95ce5cd8e734ad12e3f5f37779a08070a1399 644 outside/outside-changing
1591f6db41a30b68bd94ddccf4a4ce4f4fbe2a44 644 outside/outside-removed
50ecbc31c0e82dd60c2747c434d1f11b85c0e178 644 root
$ hg --repository server manifest --debug --rev 1
360afd990eeff79e4a7f9f3ded5ecd7bc2fd3b59 644 inside/inside-change
486c008d6dddcaeb5e5f99556a121800cdcfb149 644 outside/outside-added
153d7af5e4f53f44475bc0ff2b806c86f019eda4 644 outside/outside-changing
50ecbc31c0e82dd60c2747c434d1f11b85c0e178 644 root
$ hg --repository server manifest --debug --rev 2
1b3ab69c6c847abc8fd25537241fedcd4d188668 644 inside/inside-change
7db95ce5cd8e734ad12e3f5f37779a08070a1399 644 outside/outside-changing
1591f6db41a30b68bd94ddccf4a4ce4f4fbe2a44 644 outside/outside-removed
50ecbc31c0e82dd60c2747c434d1f11b85c0e178 644 root
$ hg --repository server manifest --debug --rev 3
1b3ab69c6c847abc8fd25537241fedcd4d188668 644 inside/inside-change
486c008d6dddcaeb5e5f99556a121800cdcfb149 644 outside/outside-added
153d7af5e4f53f44475bc0ff2b806c86f019eda4 644 outside/outside-changing
50ecbc31c0e82dd60c2747c434d1f11b85c0e178 644 root
The file changed outside should be changed by the merge
$ hg --repository server manifest --debug --rev 'desc("inside change")' | grep outside-changing
7db95ce5cd8e734ad12e3f5f37779a08070a1399 644 outside/outside-changing
$ hg --repository server manifest --debug --rev 'desc("outside change")' | grep outside-changing
153d7af5e4f53f44475bc0ff2b806c86f019eda4 644 outside/outside-changing
$ hg --repository server manifest --debug --rev 'desc("merge")' | grep outside-changing
153d7af5e4f53f44475bc0ff2b806c86f019eda4 644 outside/outside-changing