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progress: retry ferr.flush() and .write() on EINTR (issue5532)...

progress: retry ferr.flush() and .write() on EINTR (issue5532) See the inline comment how this could mitigate the issue. I couldn't reproduce the exact problem on my Linux machine, but there are at least two people who got EINTR in progress.py, and it seems file_write() of Python 2 is fundamentally broken [1]. Let's make something in on 4.2. [1]: https://hg.python.org/cpython/file/v2.7.13/Objects/fileobject.c#l1850

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        Pierre-Yves David
    
obsolescence: add test for the "branch replacement" logic during push, case A7...

              r31980
            
      ====================================

      Testing head checking code: Case A-7

      ====================================

      Mercurial checks for the introduction of new heads on push. Evolution comes

      into play to detect if existing branches on the server are being replaced by

      some of the new one we push.

      This case is part of a series of tests checking this behavior.

      Category A: simple case involving a branch being superceeded by another.

      TestCase 7: multi-changeset branch, split on multiple other, (head on its own branch), same number of head

      .. old-state:

      ..

      .. * 2 branch (1-changeset, and 2-changesets)

      ..

      .. new-state:

      ..

      .. * 1 new branch superceeding the head of the old-2-changesets-branch,

      .. * 1 new changesets on the old-1-changeset-branch superceeding the base of the other

      ..

      .. expected-result:

      ..

      .. * push allowed

      ..

      .. graph-summary:

      ..

      ..   B ø⇠◔ B'

      ..     | |

      .. A'◔⇢ø |

      ..   | |/

      .. C ● |

      ..    \|

      ..     ●

        $ . $TESTDIR/testlib/push-checkheads-util.sh

      Test setup

      ----------

        $ mkdir A7

        $ cd A7

        $ setuprepos

        creating basic server and client repo

        updating to branch default

        2 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ cd server

        $ mkcommit B0

        $ hg up 0

        0 files updated, 0 files merged, 2 files removed, 0 files unresolved

        $ mkcommit C0

        created new head

        $ cd ../client

        $ hg pull

        pulling from $TESTTMP/A7/server (glob)

        searching for changes

        adding changesets

        adding manifests

        adding file changes

        added 2 changesets with 2 changes to 2 files (+1 heads)

        (run 'hg heads' to see heads, 'hg merge' to merge)

        $ hg up 'desc(C0)'

        1 files updated, 0 files merged, 1 files removed, 0 files unresolved

        $ mkcommit A1

        $ hg up 0

        0 files updated, 0 files merged, 2 files removed, 0 files unresolved

        $ mkcommit B1

        created new head

        $ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"`

        $ hg debugobsolete `getid "desc(B0)" ` `getid "desc(B1)"`

        $ hg log -G --hidden

        @  25c56d33e4c4 (draft): B1

        |

        | o  a0802eb7fc1b (draft): A1

        | |

        | o  0f88766e02d6 (draft): C0

        |/

        | x  d73caddc5533 (draft): B0

        | |

        | x  8aaa48160adc (draft): A0

        |/

        o  1e4be0697311 (public): root

      Actual testing

      --------------

        $ hg push

        pushing to $TESTTMP/A7/server (glob)

        searching for changes

        adding changesets

        adding manifests

        adding file changes

        added 2 changesets with 2 changes to 2 files (+1 heads)

        2 new obsolescence markers

        $ cd ../..

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Pierre-Yves David obsolescence: add test for the "branch replacement" logic during push, case A7...	r31980	====================================
		Testing head checking code: Case A-7
		====================================

		Mercurial checks for the introduction of new heads on push. Evolution comes
		into play to detect if existing branches on the server are being replaced by
		some of the new one we push.

		This case is part of a series of tests checking this behavior.

		Category A: simple case involving a branch being superceeded by another.
		TestCase 7: multi-changeset branch, split on multiple other, (head on its own branch), same number of head

		.. old-state:
		..
		.. * 2 branch (1-changeset, and 2-changesets)
		..
		.. new-state:
		..
		.. * 1 new branch superceeding the head of the old-2-changesets-branch,
		.. * 1 new changesets on the old-1-changeset-branch superceeding the base of the other
		..
		.. expected-result:
		..
		.. * push allowed
		..
		.. graph-summary:
		..
		.. B ø⇠◔ B'
		.. \| \|
		.. A'◔⇢ø \|
		.. \| \|/
		.. C ● \|
		.. \\|
		.. ●

		$ . $TESTDIR/testlib/push-checkheads-util.sh

		Test setup
		----------

		$ mkdir A7
		$ cd A7
		$ setuprepos
		creating basic server and client repo
		updating to branch default
		2 files updated, 0 files merged, 0 files removed, 0 files unresolved
		$ cd server
		$ mkcommit B0
		$ hg up 0
		0 files updated, 0 files merged, 2 files removed, 0 files unresolved
		$ mkcommit C0
		created new head
		$ cd ../client
		$ hg pull
		pulling from $TESTTMP/A7/server (glob)
		searching for changes
		adding changesets
		adding manifests
		adding file changes
		added 2 changesets with 2 changes to 2 files (+1 heads)
		(run 'hg heads' to see heads, 'hg merge' to merge)
		$ hg up 'desc(C0)'
		1 files updated, 0 files merged, 1 files removed, 0 files unresolved
		$ mkcommit A1
		$ hg up 0
		0 files updated, 0 files merged, 2 files removed, 0 files unresolved
		$ mkcommit B1
		created new head
		$ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"`
		$ hg debugobsolete `getid "desc(B0)" ` `getid "desc(B1)"`
		$ hg log -G --hidden
		@ 25c56d33e4c4 (draft): B1
		\|
		\| o a0802eb7fc1b (draft): A1
		\| \|
		\| o 0f88766e02d6 (draft): C0
		\|/
		\| x d73caddc5533 (draft): B0
		\| \|
		\| x 8aaa48160adc (draft): A0
		\|/
		o 1e4be0697311 (public): root


		Actual testing
		--------------

		$ hg push
		pushing to $TESTTMP/A7/server (glob)
		searching for changes
		adding changesets
		adding manifests
		adding file changes
		added 2 changesets with 2 changes to 2 files (+1 heads)
		2 new obsolescence markers

		$ cd ../..