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view tests/test-chg.t @ 33289:abd7dedbaa36
sparse: vendor Facebook-developed extension
Facebook has developed an extension to enable "sparse" checkouts -
a working directory with a subset of files. This feature is a critical
component in enabling repositories to scale to infinite number of
files while retaining reasonable performance. It's worth noting
that sparse checkout is only one possible solution to this problem:
another is virtual filesystems that realize files on first access.
But given that virtual filesystems may not be accessible to all
users, sparse checkout is necessary as a fallback.
Per mailing list discussion at
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/095868.html
we want to add sparse checkout to the Mercurial distribution via
roughly the following mechanism:
1. Vendor extension as-is with minimal modifications (this patch)
2. Refactor extension so it is more clearly experimental and inline
with Mercurial practices
3. Move code from extension into core where possible
4. Drop experimental labeling and/or move feature into core
after sign-off from narrow clone feature owners
This commit essentially copies the sparse extension and tests
from revision 71e0a2aeca92a4078fe1b8c76e32c88ff1929737 of the
https://bitbucket.org/facebook/hg-experimental repository.
A list of modifications made as part of vendoring is as follows:
* "EXPERIMENTAL" added to module docstring
* Imports were changed to match Mercurial style conventions
* "testedwith" value was updated to core Mercurial special value and
comment boilerplate was inserted
* A "clone_sparse" function was renamed to "clonesparse" to appease
the style checker
* Paths to the sparse extension in tests reflect built-in location
* test-sparse-extensions.t was renamed to test-sparse-fsmonitor.t
and references to "simplecache" were removed. The test always skips
because it isn't trivial to run it given the way we currently run
fsmonitor tests
* A double empty line was removed from test-sparse-profiles.t
There are aspects of the added code that are obviously not ideal.
The goal is to make a minimal number of modifications as part of
the vendoring to make it easier to track changes from the original
implementation. Refactoring will occur in subsequent patches.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 01 Jul 2017 10:43:29 -0700 |
parents | fce4ed2912bb |
children | 0d0cec9602c3 |
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#require chg $ cp $HGRCPATH $HGRCPATH.orig init repo $ chg init foo $ cd foo ill-formed config $ chg status $ echo '=brokenconfig' >> $HGRCPATH $ chg status hg: parse error at * (glob) [255] $ cp $HGRCPATH.orig $HGRCPATH long socket path $ sockpath=$TESTTMP/this/path/should/be/longer/than/one-hundred-and-seven/characters/where/107/is/the/typical/size/limit/of/unix-domain-socket $ mkdir -p $sockpath $ bakchgsockname=$CHGSOCKNAME $ CHGSOCKNAME=$sockpath/server $ export CHGSOCKNAME $ chg root $TESTTMP/foo $ rm -rf $sockpath $ CHGSOCKNAME=$bakchgsockname $ export CHGSOCKNAME $ cd .. editor ------ $ cat >> pushbuffer.py <<EOF > def reposetup(ui, repo): > repo.ui.pushbuffer(subproc=True) > EOF $ chg init editor $ cd editor by default, system() should be redirected to the client: $ touch foo $ CHGDEBUG= HGEDITOR=cat chg ci -Am channeled --edit 2>&1 \ > | egrep "HG:|run 'cat" chg: debug: run 'cat "*"' at '$TESTTMP/editor' (glob) HG: Enter commit message. Lines beginning with 'HG:' are removed. HG: Leave message empty to abort commit. HG: -- HG: user: test HG: branch 'default' HG: added foo but no redirection should be made if output is captured: $ touch bar $ CHGDEBUG= HGEDITOR=cat chg ci -Am bufferred --edit \ > --config extensions.pushbuffer="$TESTTMP/pushbuffer.py" 2>&1 \ > | egrep "HG:|run 'cat" [1] check that commit commands succeeded: $ hg log -T '{rev}:{desc}\n' 1:bufferred 0:channeled $ cd .. pager ----- $ cat >> fakepager.py <<EOF > import sys > for line in sys.stdin: > sys.stdout.write('paged! %r\n' % line) > EOF enable pager extension globally, but spawns the master server with no tty: $ chg init pager $ cd pager $ cat >> $HGRCPATH <<EOF > [extensions] > pager = > [pager] > pager = $PYTHON $TESTTMP/fakepager.py > EOF $ chg version > /dev/null $ touch foo $ chg ci -qAm foo pager should be enabled if the attached client has a tty: $ chg log -l1 -q --config ui.formatted=True paged! '0:1f7b0de80e11\n' $ chg log -l1 -q --config ui.formatted=False 0:1f7b0de80e11 chg waits for pager if runcommand raises $ cat > $TESTTMP/crash.py <<EOF > from mercurial import registrar > cmdtable = {} > command = registrar.command(cmdtable) > @command(b'crash') > def pagercrash(ui, repo, *pats, **opts): > ui.write('going to crash\n') > raise Exception('.') > EOF $ cat > $TESTTMP/fakepager.py <<EOF > import sys, time > for line in iter(sys.stdin.readline, ''): > if 'crash' in line: # only interested in lines containing 'crash' > # if chg exits when pager is sleeping (incorrectly), the output > # will be captured by the next test case > time.sleep(1) > sys.stdout.write('crash-pager: %s' % line) > EOF $ cat >> .hg/hgrc <<EOF > [extensions] > crash = $TESTTMP/crash.py > EOF $ chg crash --pager=on --config ui.formatted=True 2>/dev/null crash-pager: going to crash [255] $ cd .. server lifecycle ---------------- chg server should be restarted on code change, and old server will shut down automatically. In this test, we use the following time parameters: - "sleep 1" to make mtime different - "sleep 2" to notice mtime change (polling interval is 1 sec) set up repository with an extension: $ chg init extreload $ cd extreload $ touch dummyext.py $ cat <<EOF >> .hg/hgrc > [extensions] > dummyext = dummyext.py > EOF isolate socket directory for stable result: $ OLDCHGSOCKNAME=$CHGSOCKNAME $ mkdir chgsock $ CHGSOCKNAME=`pwd`/chgsock/server warm up server: $ CHGDEBUG= chg log 2>&1 | egrep 'instruction|start' chg: debug: start cmdserver at $TESTTMP/extreload/chgsock/server.* (glob) new server should be started if extension modified: $ sleep 1 $ touch dummyext.py $ CHGDEBUG= chg log 2>&1 | egrep 'instruction|start' chg: debug: instruction: unlink $TESTTMP/extreload/chgsock/server-* (glob) chg: debug: instruction: reconnect chg: debug: start cmdserver at $TESTTMP/extreload/chgsock/server.* (glob) old server will shut down, while new server should still be reachable: $ sleep 2 $ CHGDEBUG= chg log 2>&1 | (egrep 'instruction|start' || true) socket file should never be unlinked by old server: (simulates unowned socket by updating mtime, which makes sure server exits at polling cycle) $ ls chgsock/server-* chgsock/server-* (glob) $ touch chgsock/server-* $ sleep 2 $ ls chgsock/server-* chgsock/server-* (glob) since no server is reachable from socket file, new server should be started: (this test makes sure that old server shut down automatically) $ CHGDEBUG= chg log 2>&1 | egrep 'instruction|start' chg: debug: start cmdserver at $TESTTMP/extreload/chgsock/server.* (glob) shut down servers and restore environment: $ rm -R chgsock $ CHGSOCKNAME=$OLDCHGSOCKNAME $ cd ..