diff tests/test-unionrepo.t @ 18944:a9c443b3b240

unionrepo: read-only operations on a union of two localrepos

unionrepo is just like bundlerepo without bundles.

The implementation is very similar to bundlerepo, but I don't see any obvious
way to generalize it.

Some most obvious use cases for this would be log and diff across local repos,
as a kind of preview of pulls, for instance:

  $ hg -R union:repo1+repo2 heads
  $ hg -R union:repo1+repo2 log -r REPO1REV -r REPO2REV
  $ hg -R union:repo1+repo2 log -r '::REPO1REV-::REPO2REV'
  $ hg -R union:repo1+repo2 log -r 'ancestor(REPO1REV,REPO2REV)'
  $ hg -R union:repo1+repo2 diff -r REPO1REV -r REPO2REV

This is going to be used in RhodeCode, and Bitbucket already uses something
similar. Having a core implementation would be beneficial.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-unionrepo.t	Fri Jan 18 15:54:09 2013 +0100
@@ -0,0 +1,148 @@
+Test unionrepo functionality
+
+Create one repository
+
+  $ hg init repo1
+  $ cd repo1
+  $ touch repo1-0
+  $ echo repo1-0 > f
+  $ hg ci -Aqmrepo1-0
+  $ touch repo1-1
+  $ echo repo1-1 >> f
+  $ hg ci -Aqmrepo1-1
+  $ touch repo1-2
+  $ echo repo1-2 >> f
+  $ hg ci -Aqmrepo1-2
+  $ hg log --template '{rev}:{node|short}  {desc|firstline}\n'
+  2:68c0685446a3  repo1-2
+  1:8a58db72e69d  repo1-1
+  0:f093fec0529b  repo1-0
+  $ tip1=`hg id -q`
+  $ cd ..
+
+- and a clone with a not-completely-trivial history
+
+  $ hg clone -q repo1 --rev 0 repo2
+  $ cd repo2
+  $ touch repo2-1
+  $ sed '1irepo2-1 at top' f > f.tmp
+  $ mv f.tmp f
+  $ hg ci -Aqmrepo2-1
+  $ touch repo2-2
+  $ hg pull -q ../repo1 -r 1
+  $ hg merge -q
+  $ hg ci -Aqmrepo2-2-merge
+  $ touch repo2-3
+  $ echo repo2-3 >> f
+  $ hg ci -mrepo2-3
+  $ hg log --template '{rev}:{node|short}  {desc|firstline}\n'
+  4:2f0d178c469c  repo2-3
+  3:9e6fb3e0b9da  repo2-2-merge
+  2:8a58db72e69d  repo1-1
+  1:c337dba826e7  repo2-1
+  0:f093fec0529b  repo1-0
+  $ cd ..
+
+revisions from repo2 appear as appended / pulled to repo1
+
+  $ hg -R union:repo1+repo2 log --template '{rev}:{node|short}  {desc|firstline}\n'
+  5:2f0d178c469c  repo2-3
+  4:9e6fb3e0b9da  repo2-2-merge
+  3:c337dba826e7  repo2-1
+  2:68c0685446a3  repo1-2
+  1:8a58db72e69d  repo1-1
+  0:f093fec0529b  repo1-0
+
+manifest can be retrieved for revisions in both repos
+
+  $ hg -R union:repo1+repo2 mani -r $tip1
+  f
+  repo1-0
+  repo1-1
+  repo1-2
+  $ hg -R union:repo1+repo2 mani -r 4
+  f
+  repo1-0
+  repo1-1
+  repo2-1
+  repo2-2
+
+files can be retrieved form both repos
+
+  $ hg -R repo1 cat repo1/f -r2
+  repo1-0
+  repo1-1
+  repo1-2
+
+  $ hg -R union:repo1+repo2 cat -r$tip1 repo1/f
+  repo1-0
+  repo1-1
+  repo1-2
+
+  $ hg -R union:repo1+repo2 cat -r4 $TESTTMP/repo1/f
+  repo2-1 at top
+  repo1-0
+  repo1-1
+
+files can be compared across repos
+
+  $ hg -R union:repo1+repo2 diff -r$tip1 -rtip
+  diff -r 68c0685446a3 -r 2f0d178c469c f
+  --- a/f	Thu Jan 01 00:00:00 1970 +0000
+  +++ b/f	Thu Jan 01 00:00:00 1970 +0000
+  @@ -1,3 +1,4 @@
+  +repo2-1 at top
+   repo1-0
+   repo1-1
+  -repo1-2
+  +repo2-3
+
+heads from both repos are found correctly
+
+  $ hg -R union:repo1+repo2 heads --template '{rev}:{node|short}  {desc|firstline}\n'
+  5:2f0d178c469c  repo2-3
+  2:68c0685446a3  repo1-2
+
+revsets works across repos
+
+  $ hg -R union:repo1+repo2 id -r "ancestor($tip1, 5)"
+  8a58db72e69d
+
+annotate works - an indication that linkrevs works
+
+  $ hg --cwd repo1 -R union:../repo2 annotate $TESTTMP/repo1/f -r tip
+  3: repo2-1 at top
+  0: repo1-0
+  1: repo1-1
+  5: repo2-3
+
+union repos can be cloned ... and clones works correctly
+
+  $ hg clone -U union:repo1+repo2 repo3
+  requesting all changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 6 changesets with 11 changes to 6 files (+1 heads)
+
+  $ hg -R repo3 paths
+  default = union:repo1+repo2
+
+  $ hg -R repo3 verify
+  checking changesets
+  checking manifests
+  crosschecking files in changesets and manifests
+  checking files
+  6 files, 6 changesets, 11 total revisions
+
+  $ hg -R repo3 heads --template '{rev}:{node|short}  {desc|firstline}\n'
+  5:2f0d178c469c  repo2-3
+  2:68c0685446a3  repo1-2
+
+  $ hg -R repo3 log --template '{rev}:{node|short}  {desc|firstline}\n'
+  5:2f0d178c469c  repo2-3
+  4:9e6fb3e0b9da  repo2-2-merge
+  3:c337dba826e7  repo2-1
+  2:68c0685446a3  repo1-2
+  1:8a58db72e69d  repo1-1
+  0:f093fec0529b  repo1-0