tests/test-push-checkheads-pruned-B2.t
author Arun Kulshreshtha <akulshreshtha@janestreet.com>
Tue, 30 Aug 2022 15:29:55 -0400
changeset 49491 c6a1beba27e9
parent 49168 5996640fc6fe
permissions -rw-r--r--
bisect: avoid copying ancestor list for non-merge commits During a bisection, hg needs to compute a list of all ancestors for every candidate commit. This is accomplished via a bottom-up traversal of the set of candidates, during which each revision's ancestor list is populated using the ancestor list of its parent(s). Previously, this involved copying the entire list, which could be very long in if the bisection range was large. To help improve this, we can observe that each candidate commit is visited exactly once, at which point its ancestor list is copied into its children's lists and then dropped. In the case of non-merge commits, a commit's ancestor list consists exactly of its parent's list plus itself. This means that we can trivially reuse the parent's existing list for one of its non-merge children, which avoids copying entirely if that commit is the parent's only child. This makes bisections over linear ranges of commits much faster. During some informal testing in the large publicly-available `mozilla-central` repository, this noticeably sped up bisections over large ranges of history: Setup: $ cd mozilla-central $ hg bisect --reset $ hg bisect --good 0 $ hg log -r tip -T '{rev}\n' 628417 Test: $ time hg bisect --bad tip --noupdate Before: real 3m35.927s user 3m35.553s sys 0m0.319s After: real 1m41.142s user 1m40.810s sys 0m0.285s
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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====================================
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Testing head checking code: Case B-2
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====================================
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Mercurial checks for the introduction of new heads on push. Evolution comes
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into play to detect if existing branches on the server are being replaced by
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some of the new one we push.
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This case is part of a series of tests checking this behavior.
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Category B: simple case involving pruned changesets
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TestCase 2: multi-changeset branch, head is pruned, rest is superseded
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.. old-state:
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..
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.. * 2 changeset branch
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.. new-state:
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.. * old head is pruned
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.. * 1 new branch succeeding to the other changeset in the old branch
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..
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.. expected-result:
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..
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.. * push allowed
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..
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.. graph-summary:
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..   B 
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..     |
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..   A ø⇠◔ A'
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..     |/
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..     ●
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  $ . $TESTDIR/testlib/push-checkheads-util.sh
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Test setup
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----------
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  $ mkdir B2
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  $ cd B2
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  $ setuprepos
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  creating basic server and client repo
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  updating to branch default
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ cd server
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  $ mkcommit B0
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  $ cd ../client
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  $ hg pull
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  pulling from $TESTTMP/B2/server
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  searching for changes
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  adding changesets
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  adding manifests
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  adding file changes
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  added 1 changesets with 1 changes to 1 files
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  new changesets d73caddc5533 (1 drafts)
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  (run 'hg update' to get a working copy)
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  $ hg up 0
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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
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  $ mkcommit A1
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  created new head
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  $ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"`
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  1 new obsolescence markers
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  obsoleted 1 changesets
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  1 new orphan changesets
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  $ hg debugobsolete --record-parents `getid "desc(B0)"`
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  1 new obsolescence markers
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  obsoleted 1 changesets
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  $ hg log -G --hidden
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  @  f6082bc4ffef (draft): A1
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  |
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  | x  d73caddc5533 (draft): B0
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  | |
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  | x  8aaa48160adc (draft): A0
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  |/
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  o  1e4be0697311 (public): root
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Actual testing
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--------------
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  $ hg push
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  pushing to $TESTTMP/B2/server
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  searching for changes
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  adding changesets
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  adding manifests
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  adding file changes
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  added 1 changesets with 1 changes to 1 files (+1 heads)
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  2 new obsolescence markers
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  obsoleted 2 changesets
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  $ cd ../..