view tests/test-backout.out @ 8849:80cc4b1a62d0

compare grep result between target and its parent

I found that typical case is that grep target is added at (*) revision
in the tree shown below.

     +--- 1(*) --- 3
     0
     +--- 2 ------ 4

Now, I expect 'hg grep --all' to show only rev:1 which is first
appearance of target line.

But 'hg grep --all' will tell:

  target line dis-appeared at 3 => 4
  target line     appeared at 2 => 3
  target line dis-appeared at 1 => 2
  target line     appeared at 0 => 1

because current 'hg grep' implementation compares not between target
revision and its parent, but between neighbor revisions in walkthrough
order.

I checked performance of this patch by "hg grep --follow --all
walkchangerevs" on whole Mercurial repo, and patched version could
complete as fast as un-patched one.

# should complain
abort: please specify a revision to backout
abort: please specify just one revision
# basic operation
adding a
reverting a
changeset 2:2929462c3dff backs out changeset 1:a820f4f40a57
a
# file that was removed is recreated
adding a
adding a
changeset 2:de31bdc76c0d backs out changeset 1:76862dcce372
content
# backout of backout is as if nothing happened
removing a
changeset 3:7f6d0f120113 backs out changeset 2:de31bdc76c0d
cat: a: No such file or directory
# across branch
adding a
adding b
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
abort: cannot backout change on a different branch
adding c
created new head
abort: cannot backout change on a different branch
# backout with merge
adding a
reverting a
created new head
changeset 3:26b8ccb9ad91 backs out changeset 1:5a50a024c182
merging with changeset 3:26b8ccb9ad91
merging a
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
line 1
line 2
line 3
# backout should not back out subsequent changesets
adding a
adding b
reverting a
created new head
changeset 3:3202beb76721 backs out changeset 1:22bca4c721e5
the backout changeset is a new head - do not forget to merge
(use "backout --merge" if you want to auto-merge)
b
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding a
adding b
adding c
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding d
created new head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# backout of merge should fail
abort: cannot backout a merge changeset without --parent
# backout of merge with bad parent should fail
abort: cb9a9f314b8b is not a parent of b2f3bb92043e
# backout of non-merge with parent should fail
abort: cannot use --parent on non-merge changeset
# backout with valid parent should be ok
removing d
changeset 5:10e5328c8435 backs out changeset 4:b2f3bb92043e
rolling back last transaction
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing c
changeset 5:033590168430 backs out changeset 4:b2f3bb92043e
# named branches
adding default
marked working directory as branch branch1
adding file1
marked working directory as branch branch2
adding file2
removing file1
created new head
changeset 3:d4e8f6db59fb backs out changeset 1:bf1602f437f3
the backout changeset is a new head - do not forget to merge
(use "backout --merge" if you want to auto-merge)
% on branch2 with branch1 not merged, so file1 should still exist:
45bbcd363bf0 (branch2)
C default
C file1
C file2
% on branch2 with branch1 merged, so file1 should be gone:
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
22149cdde76d (branch2) tip
C default
C file2
% on branch1, so no file1 and file2:
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
bf1602f437f3 (branch1)
C default
C file1