upstream/mercurial-mirror Files · tests/test-push-checkheads-superceed-A7.t

posix: always seek to EOF when opening a file in append mode...

posix: always seek to EOF when opening a file in append mode Python 3 already does this, so skip it there. Consider the program: #include <stdio.h> int main() { FILE *f = fopen("narf", "w"); fprintf(f, "narf\n"); fclose(f); f = fopen("narf", "a"); printf("%ld\n", ftell(f)); fprintf(f, "troz\n"); printf("%ld\n", ftell(f)); return 0; } on macOS, FreeBSD, and Linux with glibc, this program prints 5 10 but on musl libc (Alpine Linux and probably others) this prints 0 10 By my reading of https://pubs.opengroup.org/onlinepubs/009695399/functions/fopen.html this is technically correct, specifically: > Opening a file with append mode (a as the first character in the > mode argument) shall cause all subsequent writes to the file to be > forced to the then current end-of-file, regardless of intervening > calls to fseek(). in other words, the file position doesn't really matter in append-mode files, and we can't depend on it being at all meaningful unless we perform a seek() before tell() after open(..., 'a'). Experimentally after a .write() we can do a .tell() and it'll always be reasonable, but I'm unclear from reading the specification if that's a smart thing to rely on. This matches what we do on Windows and what Python 3 does for free, so let's just be consistent. Thanks to Yuya for the idea.

Boris Feld - - Load All Authors

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

      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

        searching for changes

        adding changesets

        adding manifests

        adding file changes

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

        new changesets d73caddc5533:0f88766e02d6 (2 drafts)

        (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)"`

        obsoleted 1 changesets

        1 new orphan changesets

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

        obsoleted 1 changesets

        $ 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

        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

        obsoleted 2 changesets

        $ cd ../..

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				====================================
				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
				searching for changes
				adding changesets
				adding manifests
				adding file changes
				added 2 changesets with 2 changes to 2 files (+1 heads)
				new changesets d73caddc5533:0f88766e02d6 (2 drafts)
				(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)"`
				obsoleted 1 changesets
				1 new orphan changesets
				$ hg debugobsolete `getid "desc(B0)" ` `getid "desc(B1)"`
				obsoleted 1 changesets
				$ 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
				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
				obsoleted 2 changesets

				$ cd ../..