tests/test-narrow-shallow-merges.t
author Gregory Szorc <gregory.szorc@gmail.com>
Tue, 28 Aug 2018 15:02:48 -0700
changeset 39411 aeb551a3bb8a
parent 37423 8d033b348d85
child 46779 49fd21f32695
permissions -rw-r--r--
cborutil: implement sans I/O decoder The vendored CBOR package decodes by calling read(n) on an object. There are a number of disadvantages to this: * Uses blocking I/O. If sufficient data is not available, the decoder will hang until it is. * No support for partial reads. If the read(n) returns less data than requested, the decoder raises an error. * Requires the use of a file like object. If the original data is in say a buffer, we need to "cast" it to e.g. a BytesIO to appease the decoder. In addition, the vendored CBOR decoder doesn't provide flexibility that we desire. Specifically: * It buffers indefinite length bytestrings instead of streaming them. * It doesn't allow limiting the set of types that can be decoded. This property is useful when implementing a "hardened" decoder that is less susceptible to abusive input. * It doesn't provide sufficient "hook points" and introspection to institute checks around behavior. These are useful for implementing a "hardened" decoder. This all adds up to a reasonable set of justifications for writing our own decoder. So, this commit implements our own CBOR decoder. At the heart of the decoder is a function that decodes a single "item" from a buffer. This item can be a complete simple value or a special value, such as "start of array." Using this function, we can build a decoder that effectively iterates over the stream of decoded items and builds up higher-level values, such as arrays, maps, sets, and indefinite length bytestrings. And we can do this without performing I/O in the decoder itself. The core of the sans I/O decoder will probably not be used directly. Instead, it is expected that we'll build utility functions for invoking the decoder given specific input types. This will allow extreme flexibility in how data is delivered to the decoder. I'm pretty happy with the state of the decoder modulo the TODO items to track wanted features to help with a "hardened" decoder. The one thing I could be convinced to change is the handling of semantic tags. Since we only support a single semantic tag (sets), I thought it would be easier to handle them inline in decodeitem(). This is simpler now. But if we add support for other semantic tags, it will likely be easier to move semantic tag handling outside of decodeitem(). But, properly supporting semantic tags opens up a whole can of worms, as many semantic tags imply new types. I'm optimistic we won't need these in Mercurial. But who knows. I'm also pretty happy with the test coverage. Writing comprehensive tests for partial decoding did flush out a handful of bugs. One general improvement to testing would be fuzz testing for partial decoding. I may implement that later. I also anticipate switching the wire protocol code to this new decoder will flush out any lingering bugs. Differential Revision: https://phab.mercurial-scm.org/D4414
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#require no-reposimplestore
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  $ . "$TESTDIR/narrow-library.sh"
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create full repo
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  $ hg init master
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  $ cd master
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  $ cat >> .hg/hgrc <<EOF
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  > [narrow]
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  > serveellipses=True
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  > EOF
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  $ mkdir inside
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  $ echo 1 > inside/f
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  $ hg commit -Aqm 'initial inside'
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  $ mkdir outside
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  $ echo 1 > outside/f
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  $ hg commit -Aqm 'initial outside'
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  $ echo 2a > outside/f
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  $ hg commit -Aqm 'outside 2a'
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  $ echo 3 > inside/f
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  $ hg commit -Aqm 'inside 3'
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  $ echo 4a > outside/f
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  $ hg commit -Aqm 'outside 4a'
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  $ hg update '.~3'
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ echo 2b > outside/f
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  $ hg commit -Aqm 'outside 2b'
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  $ echo 3 > inside/f
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  $ hg commit -Aqm 'inside 3'
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  $ echo 4b > outside/f
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  $ hg commit -Aqm 'outside 4b'
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  $ hg update '.~3'
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ echo 2c > outside/f
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  $ hg commit -Aqm 'outside 2c'
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  $ echo 3 > inside/f
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  $ hg commit -Aqm 'inside 3'
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  $ echo 4c > outside/f
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  $ hg commit -Aqm 'outside 4c'
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  $ hg update '.~3'
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ echo 2d > outside/f
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  $ hg commit -Aqm 'outside 2d'
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  $ echo 3 > inside/f
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  $ hg commit -Aqm 'inside 3'
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  $ echo 4d > outside/f
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  $ hg commit -Aqm 'outside 4d'
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  $ hg update -r 'desc("outside 4a")'
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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ hg merge -r 'desc("outside 4b")' 2>&1 | egrep -v '(warning:|incomplete!)'
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  merging outside/f
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  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
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  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
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  $ echo 5 > outside/f
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  $ rm outside/f.orig
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  $ hg resolve --mark outside/f
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  (no more unresolved files)
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  $ hg commit -m 'merge a/b 5'
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  $ echo 6 > outside/f
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  $ hg commit -Aqm 'outside 6'
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  $ hg merge -r 'desc("outside 4c")' 2>&1 | egrep -v '(warning:|incomplete!)'
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  merging outside/f
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  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
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  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
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  $ echo 7 > outside/f
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  $ rm outside/f.orig
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  $ hg resolve --mark outside/f
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  (no more unresolved files)
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  $ hg commit -Aqm 'merge a/b/c 7'
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  $ echo 8 > outside/f
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  $ hg commit -Aqm 'outside 8'
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  $ hg merge -r 'desc("outside 4d")' 2>&1 | egrep -v '(warning:|incomplete!)'
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  merging outside/f
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  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
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  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
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  $ echo 9 > outside/f
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  $ rm outside/f.orig
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  $ hg resolve --mark outside/f
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  (no more unresolved files)
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  $ hg commit -Aqm 'merge a/b/c/d 9'
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  $ echo 10 > outside/f
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  $ hg commit -Aqm 'outside 10'
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  $ echo 11 > inside/f
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  $ hg commit -Aqm 'inside 11'
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  $ echo 12 > outside/f
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  $ hg commit -Aqm 'outside 12'
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  $ hg log -G -T '{rev} {node|short} {desc}\n'
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  @  21 8d874d57adea outside 12
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  |
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  o  20 7ef88b4dd4fa inside 11
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  |
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  o  19 2a20009de83e outside 10
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  |
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  o    18 3ac1f5779de3 merge a/b/c/d 9
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  |\
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  | o  17 38a9c2f7e546 outside 8
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  | |
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  | o    16 094aa62fc898 merge a/b/c 7
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  | |\
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  | | o  15 f29d083d32e4 outside 6
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  | | |
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  | | o    14 2dc11382541d merge a/b 5
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  | | |\
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  o | | |  13 27d07ef97221 outside 4d
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  | | | |
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  o | | |  12 465567bdfb2d inside 3
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  | | | |
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  o | | |  11 d1c61993ec83 outside 2d
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  | | | |
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  | o | |  10 56859a8e33b9 outside 4c
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  | | | |
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  | o | |  9 bb96a08b062a inside 3
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  | | | |
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  | o | |  8 b844052e7b3b outside 2c
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  |/ / /
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  | | o  7 9db2d8fcc2a6 outside 4b
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  | | |
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  | | o  6 6418167787a6 inside 3
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  | | |
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  +---o  5 77344f344d83 outside 2b
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  | |
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  | o  4 9cadde08dc9f outside 4a
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  | |
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  | o  3 019ef06f125b inside 3
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  | |
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  | o  2 75e40c075a19 outside 2a
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  |/
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  o  1 906d6c682641 initial outside
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  |
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  o  0 9f8e82b51004 initial inside
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Now narrow and shallow clone this and get a hopefully correct graph
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  $ cd ..
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  $ hg clone --narrow ssh://user@dummy/master narrow --include inside --depth 7
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  requesting all changes
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  adding changesets
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  adding manifests
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  adding file changes
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  added 8 changesets with 3 changes to 1 files
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  new changesets *:* (glob)
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  updating to branch default
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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ cd narrow
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To make updating the tests easier, we print the emitted nodes
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sorted. This makes it easier to identify when the same node structure
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has been emitted, just in a different order.
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  $ hg log -G -T '{rev} {node|short}{if(ellipsis,"...")} {desc}\n'
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  @  7 8d874d57adea... outside 12
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  |
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  o  6 7ef88b4dd4fa inside 11
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  |
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  o  5 2a20009de83e... outside 10
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  |
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  o    4 3ac1f5779de3... merge a/b/c/d 9
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  |\
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  | o  3 465567bdfb2d inside 3
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  | |
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  | o  2 d1c61993ec83... outside 2d
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  |
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  o  1 bb96a08b062a inside 3
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  |
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  o  0 b844052e7b3b... outside 2c
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  $ hg log -T '{if(ellipsis,"...")}{node|short} {p1node|short} {p2node|short} {desc}\n' | sort
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  ...2a20009de83e 000000000000 3ac1f5779de3 outside 10
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  ...3ac1f5779de3 bb96a08b062a 465567bdfb2d merge a/b/c/d 9
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  ...8d874d57adea 7ef88b4dd4fa 000000000000 outside 12
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  ...b844052e7b3b 000000000000 000000000000 outside 2c
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  ...d1c61993ec83 000000000000 000000000000 outside 2d
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  465567bdfb2d d1c61993ec83 000000000000 inside 3
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  7ef88b4dd4fa 2a20009de83e 000000000000 inside 11
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  bb96a08b062a b844052e7b3b 000000000000 inside 3
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  $ cd ..
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Incremental test case: show a pull can pull in a conflicted merge even if elided
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  $ hg init pullmaster
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  $ cd pullmaster
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  $ cat >> .hg/hgrc <<EOF
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  > [narrow]
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  > serveellipses=True
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  > EOF
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  $ mkdir inside outside
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  $ echo v1 > inside/f
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  $ echo v1 > outside/f
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  $ hg add inside/f outside/f
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  $ hg commit -m init
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  $ for line in a b c d
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  > do
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  > hg update -r 0
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  > echo v2$line > outside/f
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  > hg commit -m "outside 2$line"
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  > echo v2$line > inside/f
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  > hg commit -m "inside 2$line"
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  > echo v3$line > outside/f
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  > hg commit -m "outside 3$line"
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  > echo v4$line > outside/f
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  > hg commit -m "outside 4$line"
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  > done
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  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  created new head
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  created new head
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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  created new head
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   227
  $ cd ..
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  $ hg clone --narrow ssh://user@dummy/pullmaster pullshallow \
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   229
  >          --include inside --depth 3
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   230
  requesting all changes
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parents:
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   231
  adding changesets
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parents:
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   232
  adding manifests
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parents:
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   233
  adding file changes
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   234
  added 12 changesets with 5 changes to 1 files (+3 heads)
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  new changesets *:* (glob)
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   236
  updating to branch default
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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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   238
  $ cd pullshallow
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   239
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  $ hg log -G -T '{rev} {node|short}{if(ellipsis,"...")} {desc}\n'
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   241
  @  11 0ebbd712a0c8... outside 4d
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  |
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   243
  o  10 0d4c867aeb23 inside 2d
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parents:
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   244
  |
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   245
  o  9 e932969c3961... outside 2d
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parents:
diff changeset
   246
  
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   247
  o  8 33d530345455... outside 4c
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parents:
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   248
  |
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   249
  o  7 0ce6481bfe07 inside 2c
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parents:
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   250
  |
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   251
  o  6 caa65c940632... outside 2c
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   252
  
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   253
  o  5 3df233defecc... outside 4b
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parents:
diff changeset
   254
  |
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parents:
diff changeset
   255
  o  4 7162cc6d11a4 inside 2b
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parents:
diff changeset
   256
  |
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parents:
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   257
  o  3 f2a632f0082d... outside 2b
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parents:
diff changeset
   258
  
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   259
  o  2 b8a3da16ba49... outside 4a
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parents:
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  |
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parents:
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   261
  o  1 53f543eb8e45 inside 2a
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parents:
diff changeset
   262
  |
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parents:
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   263
  o  0 1be3e5221c6a... outside 2a
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parents:
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   264
  
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   265
  $ hg log -T '{if(ellipsis,"...")}{node|short} {p1node|short} {p2node|short} {desc}\n' | sort
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parents:
diff changeset
   266
  ...0ebbd712a0c8 0d4c867aeb23 000000000000 outside 4d
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parents:
diff changeset
   267
  ...1be3e5221c6a 000000000000 000000000000 outside 2a
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parents:
diff changeset
   268
  ...33d530345455 0ce6481bfe07 000000000000 outside 4c
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parents:
diff changeset
   269
  ...3df233defecc 7162cc6d11a4 000000000000 outside 4b
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parents:
diff changeset
   270
  ...b8a3da16ba49 53f543eb8e45 000000000000 outside 4a
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parents:
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   271
  ...caa65c940632 000000000000 000000000000 outside 2c
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parents:
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   272
  ...e932969c3961 000000000000 000000000000 outside 2d
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parents:
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   273
  ...f2a632f0082d 000000000000 000000000000 outside 2b
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parents:
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   274
  0ce6481bfe07 caa65c940632 000000000000 inside 2c
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parents:
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   275
  0d4c867aeb23 e932969c3961 000000000000 inside 2d
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parents:
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   276
  53f543eb8e45 1be3e5221c6a 000000000000 inside 2a
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parents:
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   277
  7162cc6d11a4 f2a632f0082d 000000000000 inside 2b
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parents:
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   279
  $ cd ../pullmaster
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   280
  $ hg update -r 'desc("outside 4a")'
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parents:
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   281
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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   282
  $ hg merge -r 'desc("outside 4b")' 2>&1 | egrep -v '(warning:|incomplete!)'
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parents:
diff changeset
   283
  merging inside/f
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parents:
diff changeset
   284
  merging outside/f
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parents:
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   285
  0 files updated, 0 files merged, 0 files removed, 2 files unresolved
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parents:
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   286
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
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parents:
diff changeset
   287
  $ echo 3 > inside/f
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parents:
diff changeset
   288
  $ echo 5 > outside/f
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parents:
diff changeset
   289
  $ rm -f {in,out}side/f.orig
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parents:
diff changeset
   290
  $ hg resolve --mark inside/f outside/f
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parents:
diff changeset
   291
  (no more unresolved files)
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parents:
diff changeset
   292
  $ hg commit -m 'merge a/b 5'
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parents:
diff changeset
   293
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parents:
diff changeset
   294
  $ hg update -r 'desc("outside 4c")'
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parents:
diff changeset
   295
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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parents:
diff changeset
   296
  $ hg merge -r 'desc("outside 4d")' 2>&1 | egrep -v '(warning:|incomplete!)'
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parents:
diff changeset
   297
  merging inside/f
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parents:
diff changeset
   298
  merging outside/f
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parents:
diff changeset
   299
  0 files updated, 0 files merged, 0 files removed, 2 files unresolved
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parents:
diff changeset
   300
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
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parents:
diff changeset
   301
  $ echo 3 > inside/f
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parents:
diff changeset
   302
  $ echo 5 > outside/f
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parents:
diff changeset
   303
  $ rm -f {in,out}side/f.orig
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parents:
diff changeset
   304
  $ hg resolve --mark inside/f outside/f
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parents:
diff changeset
   305
  (no more unresolved files)
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parents:
diff changeset
   306
  $ hg commit -m 'merge c/d 5'
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Augie Fackler <augie@google.com>
parents:
diff changeset
   307
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parents:
diff changeset
   308
  $ hg update -r 'desc("merge a/b 5")'
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parents:
diff changeset
   309
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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parents:
diff changeset
   310
  $ hg merge -r 'desc("merge c/d 5")'
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parents:
diff changeset
   311
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
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parents:
diff changeset
   312
  (branch merge, don't forget to commit)
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parents:
diff changeset
   313
  $ echo 6 > outside/f
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parents:
diff changeset
   314
  $ hg commit -m 'outside 6'
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parents:
diff changeset
   315
  $ echo 7 > outside/f
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parents:
diff changeset
   316
  $ hg commit -m 'outside 7'
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parents:
diff changeset
   317
  $ echo 8 > outside/f
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parents:
diff changeset
   318
  $ hg commit -m 'outside 8'
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parents:
diff changeset
   319
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parents:
diff changeset
   320
  $ cd ../pullshallow
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parents:
diff changeset
   321
  $ hg pull --depth 3
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Augie Fackler <augie@google.com>
parents:
diff changeset
   322
  pulling from ssh://user@dummy/pullmaster
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   323
  searching for changes
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   324
  adding changesets
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   325
  adding manifests
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   326
  adding file changes
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   327
  added 4 changesets with 3 changes to 1 files (-3 heads)
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   328
  new changesets *:* (glob)
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   329
  (run 'hg update' to get a working copy)
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   330
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
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parents:
diff changeset
   331
  $ hg log -T '{if(ellipsis,"...")}{node|short} {p1node|short} {p2node|short} {desc}\n' | sort
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Augie Fackler <augie@google.com>
parents:
diff changeset
   332
  ...0ebbd712a0c8 0d4c867aeb23 000000000000 outside 4d
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   333
  ...1be3e5221c6a 000000000000 000000000000 outside 2a
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Augie Fackler <augie@google.com>
parents:
diff changeset
   334
  ...33d530345455 0ce6481bfe07 000000000000 outside 4c
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   335
  ...3df233defecc 7162cc6d11a4 000000000000 outside 4b
a2a6e724d61a narrow: import experimental extension from narrowhg revision cb51d673e9c5
Augie Fackler <augie@google.com>
parents:
diff changeset
   336
  ...b8a3da16ba49 53f543eb8e45 000000000000 outside 4a
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Augie Fackler <augie@google.com>
parents:
diff changeset
   337
  ...bf545653453e 968003d40c60 000000000000 outside 8
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Augie Fackler <augie@google.com>
parents:
diff changeset
   338
  ...caa65c940632 000000000000 000000000000 outside 2c
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Augie Fackler <augie@google.com>
parents:
diff changeset
   339
  ...e932969c3961 000000000000 000000000000 outside 2d
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Augie Fackler <augie@google.com>
parents:
diff changeset
   340
  ...f2a632f0082d 000000000000 000000000000 outside 2b
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Augie Fackler <augie@google.com>
parents:
diff changeset
   341
  0ce6481bfe07 caa65c940632 000000000000 inside 2c
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Augie Fackler <augie@google.com>
parents:
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  53f543eb8e45 1be3e5221c6a 000000000000 inside 2a
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  67d49c0bdbda b8a3da16ba49 3df233defecc merge a/b 5
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  7162cc6d11a4 f2a632f0082d 000000000000 inside 2b
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  968003d40c60 67d49c0bdbda e867021d52c2 outside 6
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