tests/test-push-checkheads-unpushed-D6.t
author Arun Kulshreshtha <akulshreshtha@janestreet.com>
Tue, 30 Aug 2022 15:29:55 -0400
changeset 49491 c6a1beba27e9
parent 46119 9261f6c1d39b
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
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====================================
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Testing head checking code: Case D-6
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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 D: remote head is "obs-affected" locally, but result is not part of the push
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TestCase 6: single changeset, superseeded then pruned (on a new changeset unpushed) changeset
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This is a partial push variation of case B-6
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.. old-state:
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..
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.. * 1 changeset branch
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..
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.. new-state:
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..
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.. * old branch is rewritten onto another one,
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.. * the new version is then pruned.
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..
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.. expected-result:
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..
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.. * push denied
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..
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.. graph-summary:
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..
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..   A ø⇠⊗ A'
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..     | |
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.. C ◔ | ○ B
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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 D6
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  $ cd D6
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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 client
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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 B0
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  created new head
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  $ mkcommit A1
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  $ hg up '0'
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  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
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  $ mkcommit C0
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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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  $ hg debugobsolete --record-parents `getid "desc(A1)"`
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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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  @  0f88766e02d6 (draft): C0
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  |
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  | x  ba93660aff8d (draft): A1
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  | |
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  | o  74ff5441d343 (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 --rev 'desc(C0)'
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  pushing to $TESTTMP/D6/server
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  searching for changes
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  abort: push creates new remote head 0f88766e02d6
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  (merge or see 'hg help push' for details about pushing new heads)
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  [20]
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  $ cd ../..