view tests/test-issue1502.t @ 20275:2123d27ff75d

backout: avoid update on simple case. Before the changeset the backout process was: 1) go to <target> 2) revert to <target> parent 3) update back to changeset we came from The two update steps can takes a very long time to move back and forth unrelated file change between <target> and current working directory. The new process is just merging current working directory with the parent of <target> using <target> as ancestor. This give the very same result but skip the two updates. On big repo with a lot of files and changes that save a lots of time (x20 for one week window). The "merge" version (hg backout --merge) is still done with upgrades. We could imagine using in memory commit to speed it up but this is another fish.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Wed, 08 Jan 2014 14:53:46 -0800
parents 76df01e56e7f
children 2fc86d92c4a9
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http://mercurial.selenic.com/bts/issue1502

Initialize repository

  $ hg init foo
  $ touch foo/a && hg -R foo commit -A -m "added a"
  adding a

  $ hg clone foo foo1
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo "bar" > foo1/a && hg -R foo1 commit -m "edit a in foo1"
  $ echo "hi" > foo/a && hg -R foo commit -m "edited a foo"
  $ hg -R foo1 pull -u
  pulling from $TESTTMP/foo (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  not updating: not a linear update
  (merge or update --check to force update)

  $ hg -R foo1 book branchy
  $ hg -R foo1 book
   * branchy                   1:e3e522925eff

Pull. Bookmark should not jump to new head.

  $ echo "there" >> foo/a && hg -R foo commit -m "edited a again"
  $ hg -R foo1 pull
  pulling from $TESTTMP/foo (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  (run 'hg update' to get a working copy)

  $ hg -R foo1 book
   * branchy                   1:e3e522925eff