Mercurial > hg
view tests/test-incoming-outgoing.t @ 46607:e9901d01d135
revlog: add a mechanism to verify expected file position before appending
If someone uses `hg debuglocks`, or some non-hg process writes to the .hg
directory without respecting the locks, or if the repo's on a networked
filesystem, it's possible for the revlog code to write out corrupted data.
The form of this corruption can vary depending on what data was written and how
that happened. We are in the "networked filesystem" case (though I've had users
also do this to themselves with the "`hg debuglocks`" scenario), and most often
see this with the changelog. What ends up happening is we produce two items
(let's call them rev1 and rev2) in the .i file that have the same linkrev,
baserev, and offset into the .d file, while the data in the .d file is appended
properly. rev2's compressed_size is accurate for rev2, but when we go to
decompress the data in the .d file, we use the offset that's recorded in the
index file, which is the same as rev1, and attempt to decompress
rev2.compressed_size bytes of rev1's data. This usually does not succeed. :)
When using inline data, this also fails, though I haven't investigated why too
closely. This shows up as a "patch decode" error. I believe what's happening
there is that we're basically ignoring the offset field, getting the data
properly, but since baserev != rev, it thinks this is a delta based on rev
(instead of a full text) and can't actually apply it as such.
For now, I'm going to make this an optional component and default it to entirely
off. I may increase the default severity of this in the future, once I've
enabled it for my users and we gain more experience with it. Luckily, most of my
users have a versioned filesystem and can roll back to before the corruption has
been written, it's just a hassle to do so and not everyone knows how (so it's a
support burden). Users on other filesystems will not have that luxury, and this
can cause them to have a corrupted repository that they are unlikely to know how
to resolve, and they'll see this as a data-loss event. Refusing to create the
corruption is a much better user experience.
This mechanism is not perfect. There may be false-negatives (racy writes that
are not detected). There should not be any false-positives (non-racy writes that
are detected as such). This is not a mechanism that makes putting a repo on a
networked filesystem "safe" or "supported", just *less* likely to cause
corruption.
Differential Revision: https://phab.mercurial-scm.org/D9952
author | Kyle Lippincott <spectral@google.com> |
---|---|
date | Wed, 03 Feb 2021 16:33:10 -0800 |
parents | f1186c292d03 |
children | 2f2682f40ea0 |
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#require serve $ hg init test $ cd test $ for i in 0 1 2 3 4 5 6 7 8; do > echo $i >> foo > hg commit -A -m $i > done adding foo $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 9 changesets with 9 changes to 1 files $ hg serve -p $HGPORT -d --pid-file=hg.pid $ cat hg.pid >> $DAEMON_PIDS $ cd .. $ hg init new http incoming $ hg -R new incoming http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming -r 4 http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 local incoming $ hg -R new incoming test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming -r 4 test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 limit to 2 changesets $ hg -R new incoming -l 2 test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 limit to 2 changesets, test with -p --git $ hg -R new incoming -l 2 -p --git test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 diff --git a/foo b/foo new file mode 100644 --- /dev/null +++ b/foo @@ -0,0 +1,1 @@ +0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 diff --git a/foo b/foo --- a/foo +++ b/foo @@ -1,1 +1,2 @@ 0 +1 test with --bundle $ hg -R new incoming --bundle test.hg http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R new incoming --bundle test2.hg test comparing with test changeset: 0:00a43fa82f62 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 changeset: 1:5460a410df01 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 1 changeset: 2:d9f42cd1a1ec user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 2 changeset: 3:376476025137 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 3 changeset: 4:70d7eb252d49 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 4 changeset: 5:ad284ee3b5ee user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 5 changeset: 6:e9229f2de384 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 6 changeset: 7:d152815bb8db user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 7 changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 test the resulting bundles $ hg init temp $ hg init temp2 $ hg -R temp unbundle test.hg adding changesets adding manifests adding file changes added 9 changesets with 9 changes to 1 files new changesets 00a43fa82f62:e4feb4ac9035 (9 drafts) (run 'hg update' to get a working copy) $ hg -R temp2 unbundle test2.hg adding changesets adding manifests adding file changes added 9 changesets with 9 changes to 1 files new changesets 00a43fa82f62:e4feb4ac9035 (9 drafts) (run 'hg update' to get a working copy) $ hg -R temp tip changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ hg -R temp2 tip changeset: 8:e4feb4ac9035 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 8 $ rm -r temp temp2 new test outgoing $ hg clone test test-dev updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd test-dev $ for i in 9 10 11 12 13; do > echo $i >> foo > hg commit -A -m $i > done $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 14 changesets with 14 changes to 1 files $ cd .. $ hg -R test-dev outgoing test comparing with test searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 changeset: 12:e576b1bed305 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 12 changeset: 13:96bbff09a7cc tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 13 test outgoing with secret changesets $ hg -R test-dev phase --force --secret 9 $ hg -R test-dev outgoing test comparing with test searching for changes no changes found (ignored 5 secret changesets) [1] $ hg -R test-dev phase --draft -r 'head()' limit to 3 changesets $ hg -R test-dev outgoing -l 3 test comparing with test searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 $ hg -R test-dev outgoing http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 changeset: 12:e576b1bed305 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 12 changeset: 13:96bbff09a7cc tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 13 $ hg -R test-dev outgoing -r 11 http://localhost:$HGPORT/ comparing with http://localhost:$HGPORT/ searching for changes changeset: 9:d89d4abea5bc user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 9 changeset: 10:820095aa7158 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 10 changeset: 11:09ede2f3a638 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 11 incoming from empty remote repository $ hg init r1 $ hg init r2 $ echo a > r1/foo $ hg -R r1 ci -Ama adding foo $ hg -R r1 incoming r2 --bundle x.hg comparing with r2 searching for changes no changes found [1] Create a "split" repo that pulls from r1 and pushes to r2, using default-push $ hg clone r1 split updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cat > split/.hg/hgrc << EOF > [paths] > default = $TESTTMP/r3 > default-push = $TESTTMP/r2 > EOF $ hg -R split outgoing comparing with $TESTTMP/r2 searching for changes changeset: 0:3e92d79f743a tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a Use default:pushurl instead of default-push Windows needs a leading slash to make a URL that passes all of the checks $ WD=`pwd` #if windows $ WD="/$WD" #endif $ cat > split/.hg/hgrc << EOF > [paths] > default = $WD/r3 > default:pushurl = file://$WD/r2 > EOF $ hg -R split outgoing comparing with file:/*/$TESTTMP/r2 (glob) searching for changes changeset: 0:3e92d79f743a tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a Push and then double-check outgoing $ echo a >> split/foo $ hg -R split commit -Ama $ hg -R split push pushing to file:/*/$TESTTMP/r2 (glob) searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files $ hg -R split outgoing comparing with file:/*/$TESTTMP/r2 (glob) searching for changes no changes found [1]