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patch: support diff data loss detection and upgrade...
patch: support diff data loss detection and upgrade In worst case, generating diff in upgrade mode can be two times more expensive than generating it in git mode directly: we may have to regenerate the whole diff again whenever a git feature is detected. Also, the first diff attempt is completely buffered instead of being streamed. That said, even without having profiled it yet, I am convinced we can fast-path the upgrade mode if necessary were it to be used in regular diff commands, and not only in mq where avoiding data loss is worth the price.

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r9717:68a1b9d0 default
r10189:e451e599 default
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test-up-local-change.out
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/ tests / test-up-local-change.out
adding a
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
diff -r 33aaa84a386b a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-a
+abc
adding b
M a
changeset: 0:33aaa84a386b
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
searching for copies back to rev 1
unmatched files in other:
b
resolving manifests
overwrite False partial False
ancestor 33aaa84a386b local 33aaa84a386b+ remote 802f095af299
a: versions differ -> m
b: remote created -> g
preserving a for resolve of a
picked tool 'true' for a (binary False symlink False)
merging a
my a@33aaa84a386b+ other a@802f095af299 ancestor a@33aaa84a386b
getting b
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
changeset: 1:802f095af299
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2
resolving manifests
overwrite False partial False
ancestor 802f095af299 local 802f095af299+ remote 33aaa84a386b
a: versions differ -> m
b: other deleted -> r
preserving a for resolve of a
removing b
picked tool 'true' for a (binary False symlink False)
merging a
my a@802f095af299+ other a@33aaa84a386b ancestor a@33aaa84a386b
premerge successful
0 files updated, 1 files merged, 1 files removed, 0 files unresolved
changeset: 0:33aaa84a386b
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
abort: there is nothing to merge - use "hg update" instead
failed
changeset: 0:33aaa84a386b
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
searching for copies back to rev 1
unmatched files in other:
b
resolving manifests
overwrite False partial False
ancestor 33aaa84a386b local 33aaa84a386b+ remote 802f095af299
a: versions differ -> m
b: remote created -> g
preserving a for resolve of a
picked tool 'true' for a (binary False symlink False)
merging a
my a@33aaa84a386b+ other a@802f095af299 ancestor a@33aaa84a386b
getting b
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
changeset: 1:802f095af299
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2
changeset: 1:802f095af299
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
files: a b
description:
2
changeset: 0:33aaa84a386b
user: test
date: Mon Jan 12 13:46:40 1970 +0000
files: a
description:
1
diff -r 802f095af299 a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-a2
+abc
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
adding b
created new head
M a
changeset: 1:802f095af299
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2
abort: crosses branches (use 'hg merge' to merge or use 'hg update -C' to discard changes)
failed
abort: outstanding uncommitted changes (use 'hg status' to list changes)
failed
searching for copies back to rev 1
resolving manifests
overwrite False partial False
ancestor 33aaa84a386b local 802f095af299+ remote 030602aee63d
a: versions differ -> m
b: versions differ -> m
preserving a for resolve of a
preserving b for resolve of b
picked tool 'true' for a (binary False symlink False)
merging a
my a@802f095af299+ other a@030602aee63d ancestor a@33aaa84a386b
picked tool 'true' for b (binary False symlink False)
merging b
my b@802f095af299+ other b@030602aee63d ancestor b@000000000000
0 files updated, 2 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
changeset: 1:802f095af299
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2
changeset: 2:030602aee63d
tag: tip
parent: 0:33aaa84a386b
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 3
diff -r 802f095af299 a
--- a/a
+++ b/a
@@ -1,1 +1,1 @@
-a2
+abc
adding a
pulling from ../a
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
1 files updated, 0 files merged, 0 files removed, 0 files unresolved