tests/test-convert-svn-startrev.t

merge: cache unknown dir checks (issue5716)

As mentioned in D1222, the recent pathconflicts change regresses update
performance in large repositories when many files are being updated.

To mitigate this, we introduce two caches of directories that have
already found to be either:

  - unknown directories, but which are not aliased by files and
    so don't need to be checked if they are files again; and

  - missing directores, which cannot cause path conflicts, and
    cannot contain a file that causes a path conflict.

When checking the paths of a file, testing against this caches means we can
skip tests that involve touching the filesystem.

Differential Revision: https://phab.mercurial-scm.org/D1224

#require svn svn-bindings

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > convert =
  > EOF
  $ convert()
  > {
  >     startrev=$1
  >     repopath=A-r$startrev-hg
  >     hg convert --config convert.svn.startrev=$startrev \
  >         --config convert.svn.trunk=branches/branch1 \
  >         --config convert.svn.branches="  " \
  >         --config convert.svn.tags= \
  >         --datesort svn-repo $repopath
  >     hg -R $repopath log -G \
  >         --template '{rev} {desc|firstline} files: {files}\n'
  >     echo
  > }

  $ svnadmin create svn-repo
  $ svnadmin load -q svn-repo < "$TESTDIR/svn/startrev.svndump"

Convert before branching point

  $ convert 3
  initializing destination A-r3-hg repository
  scanning source...
  sorting...
  converting...
  3 removeb
  2 changeaa
  1 branch, changeaaa
  0 addc,changeaaaa
  o  3 addc,changeaaaa files: a c
  |
  o  2 branch, changeaaa files: a
  |
  o  1 changeaa files: a
  |
  o  0 removeb files: a
  
  

Convert before branching point

  $ convert 4
  initializing destination A-r4-hg repository
  scanning source...
  sorting...
  converting...
  2 changeaa
  1 branch, changeaaa
  0 addc,changeaaaa
  o  2 addc,changeaaaa files: a c
  |
  o  1 branch, changeaaa files: a
  |
  o  0 changeaa files: a
  
  

Convert at branching point

  $ convert 5
  initializing destination A-r5-hg repository
  scanning source...
  sorting...
  converting...
  1 branch, changeaaa
  0 addc,changeaaaa
  o  1 addc,changeaaaa files: a c
  |
  o  0 branch, changeaaa files: a
  
  

Convert last revision only

  $ convert 6
  initializing destination A-r6-hg repository
  scanning source...
  sorting...
  converting...
  0 addc,changeaaaa
  o  0 addc,changeaaaa files: a c