tests/test-bookmarks-pushpull.t

chgserver: invalidate the server if extensions fail to load

Previously, if extensions fail to load, chg server will just keep working
without those extensions. It will print a warning message but only if a new
server starts.

This patch invalidates the server if any extension failed to load, but still
serve the client (hopefully just) once. It will help chg pass some test cases
of test-bad-extension.t.

#require serve

  $ cat << EOF >> $HGRCPATH
  > [ui]
  > logtemplate={rev}:{node|short} {desc|firstline}
  > [phases]
  > publish=False
  > [experimental]
  > evolution=createmarkers,exchange
  > # drop me once bundle2 is the default,
  > # added to get test change early.
  > bundle2-exp = True
  > EOF

initialize

  $ hg init a
  $ cd a
  $ echo 'test' > test
  $ hg commit -Am'test'
  adding test

set bookmarks

  $ hg bookmark X
  $ hg bookmark Y
  $ hg bookmark Z

import bookmark by name

  $ hg init ../b
  $ cd ../b
  $ hg book Y
  $ hg book
   * Y                         -1:000000000000
  $ hg pull ../a
  pulling from ../a
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  adding remote bookmark X
  updating bookmark Y
  adding remote bookmark Z
  (run 'hg update' to get a working copy)
  $ hg bookmarks
     X                         0:4e3505fd9583
   * Y                         0:4e3505fd9583
     Z                         0:4e3505fd9583
  $ hg debugpushkey ../a namespaces
  bookmarks	
  namespaces	
  obsolete	
  phases	
  $ hg debugpushkey ../a bookmarks
  X	4e3505fd95835d721066b76e75dbb8cc554d7f77
  Y	4e3505fd95835d721066b76e75dbb8cc554d7f77
  Z	4e3505fd95835d721066b76e75dbb8cc554d7f77

delete the bookmark to re-pull it

  $ hg book -d X
  $ hg pull -B X ../a
  pulling from ../a
  no changes found
  adding remote bookmark X

finally no-op pull

  $ hg pull -B X ../a
  pulling from ../a
  no changes found
  $ hg bookmark
     X                         0:4e3505fd9583
   * Y                         0:4e3505fd9583
     Z                         0:4e3505fd9583

export bookmark by name

  $ hg bookmark W
  $ hg bookmark foo
  $ hg bookmark foobar
  $ hg push -B W ../a
  pushing to ../a
  searching for changes
  no changes found
  exporting bookmark W
  [1]
  $ hg -R ../a bookmarks
     W                         -1:000000000000
     X                         0:4e3505fd9583
     Y                         0:4e3505fd9583
   * Z                         0:4e3505fd9583

delete a remote bookmark

  $ hg book -d W
  $ hg push -B W ../a
  pushing to ../a
  searching for changes
  no changes found
  deleting remote bookmark W
  [1]

export the active bookmark

  $ hg bookmark V
  $ hg push -B . ../a
  pushing to ../a
  searching for changes
  no changes found
  exporting bookmark V
  [1]

delete the bookmark

  $ hg book -d V
  $ hg push -B V ../a
  pushing to ../a
  searching for changes
  no changes found
  deleting remote bookmark V
  [1]
  $ hg up foobar
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark foobar)

push/pull name that doesn't exist

  $ hg push -B badname ../a
  pushing to ../a
  searching for changes
  bookmark badname does not exist on the local or remote repository!
  no changes found
  [2]
  $ hg pull -B anotherbadname ../a
  pulling from ../a
  abort: remote bookmark anotherbadname not found!
  [255]

divergent bookmarks

  $ cd ../a
  $ echo c1 > f1
  $ hg ci -Am1
  adding f1
  $ hg book -f @
  $ hg book -f X
  $ hg book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         0:4e3505fd9583
     Z                         1:0d2164f0ce0d

  $ cd ../b
  $ hg up
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updating bookmark foobar
  $ echo c2 > f2
  $ hg ci -Am2
  adding f2
  $ hg book -if @
  $ hg book -if X
  $ hg book
     @                         1:9b140be10808
     X                         1:9b140be10808
     Y                         0:4e3505fd9583
     Z                         0:4e3505fd9583
     foo                       -1:000000000000
   * foobar                    1:9b140be10808

  $ hg pull --config paths.foo=../a foo
  pulling from $TESTTMP/a (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  divergent bookmark @ stored as @foo
  divergent bookmark X stored as X@foo
  updating bookmark Z
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg book
     @                         1:9b140be10808
     @foo                      2:0d2164f0ce0d
     X                         1:9b140be10808
     X@foo                     2:0d2164f0ce0d
     Y                         0:4e3505fd9583
     Z                         2:0d2164f0ce0d
     foo                       -1:000000000000
   * foobar                    1:9b140be10808

(test that too many divergence of bookmark)

  $ python $TESTDIR/seq.py 1 100 | while read i; do hg bookmarks -r 000000000000 "X@${i}"; done
  $ hg pull ../a
  pulling from ../a
  searching for changes
  no changes found
  warning: failed to assign numbered name to divergent bookmark X
  divergent bookmark @ stored as @1
  $ hg bookmarks | grep '^   X' | grep -v ':000000000000'
     X                         1:9b140be10808
     X@foo                     2:0d2164f0ce0d

(test that remotely diverged bookmarks are reused if they aren't changed)

  $ hg bookmarks | grep '^   @'
     @                         1:9b140be10808
     @1                        2:0d2164f0ce0d
     @foo                      2:0d2164f0ce0d
  $ hg pull ../a
  pulling from ../a
  searching for changes
  no changes found
  warning: failed to assign numbered name to divergent bookmark X
  divergent bookmark @ stored as @1
  $ hg bookmarks | grep '^   @'
     @                         1:9b140be10808
     @1                        2:0d2164f0ce0d
     @foo                      2:0d2164f0ce0d

  $ python $TESTDIR/seq.py 1 100 | while read i; do hg bookmarks -d "X@${i}"; done
  $ hg bookmarks -d "@1"

  $ hg push -f ../a
  pushing to ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  $ hg -R ../a book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         0:4e3505fd9583
     Z                         1:0d2164f0ce0d

explicit pull should overwrite the local version (issue4439)

  $ hg pull --config paths.foo=../a foo -B X
  pulling from $TESTTMP/a (glob)
  no changes found
  divergent bookmark @ stored as @foo
  importing bookmark X

reinstall state for further testing:

  $ hg book -fr 9b140be10808 X

revsets should not ignore divergent bookmarks

  $ hg bookmark -fr 1 Z
  $ hg log -r 'bookmark()' --template '{rev}:{node|short} {bookmarks}\n'
  0:4e3505fd9583 Y
  1:9b140be10808 @ X Z foobar
  2:0d2164f0ce0d @foo X@foo
  $ hg log -r 'bookmark("X@foo")' --template '{rev}:{node|short} {bookmarks}\n'
  2:0d2164f0ce0d @foo X@foo
  $ hg log -r 'bookmark("re:X@foo")' --template '{rev}:{node|short} {bookmarks}\n'
  2:0d2164f0ce0d @foo X@foo

update a remote bookmark from a non-head to a head

  $ hg up -q Y
  $ echo c3 > f2
  $ hg ci -Am3
  adding f2
  created new head
  $ hg push ../a
  pushing to ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  updating bookmark Y
  $ hg -R ../a book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         3:f6fc62dde3c0
     Z                         1:0d2164f0ce0d

update a bookmark in the middle of a client pulling changes

  $ cd ..
  $ hg clone -q a pull-race

We want to use http because it is stateless and therefore more susceptible to
race conditions

  $ hg -R pull-race serve -p $HGPORT -d --pid-file=pull-race.pid -E main-error.log
  $ cat pull-race.pid >> $DAEMON_PIDS

  $ hg clone -q http://localhost:$HGPORT/ pull-race2
  $ cd pull-race
  $ hg up -q Y
  $ echo c4 > f2
  $ hg ci -Am4
  $ echo c5 > f3
  $ cat <<EOF > .hg/hgrc
  > [hooks]
  > outgoing.makecommit = hg ci -Am5; echo committed in pull-race
  > EOF

(new config needs a server restart)

  $ cd ..
  $ killdaemons.py
  $ hg -R pull-race serve -p $HGPORT -d --pid-file=pull-race.pid -E main-error.log
  $ cat pull-race.pid >> $DAEMON_PIDS
  $ cd pull-race2
  $ hg -R $TESTTMP/pull-race book
     @                         1:0d2164f0ce0d
     X                         1:0d2164f0ce0d
   * Y                         4:b0a5eff05604
     Z                         1:0d2164f0ce0d
  $ hg pull
  pulling from http://localhost:$HGPORT/
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  updating bookmark Y
  (run 'hg update' to get a working copy)
  $ hg book
   * @                         1:0d2164f0ce0d
     X                         1:0d2164f0ce0d
     Y                         4:b0a5eff05604
     Z                         1:0d2164f0ce0d

Update a bookmark right after the initial lookup -B (issue4689)

  $ echo c6 > ../pull-race/f3 # to be committed during the race
  $ cat <<EOF > ../pull-race/.hg/hgrc
  > [hooks]
  > # If anything to commit, commit it right after the first key listing used
  > # during lookup. This makes the commit appear before the actual getbundle
  > # call.
  > listkeys.makecommit= ((hg st | grep -q M) && (hg commit -m race; echo commited in pull-race)) || exit 0
  > EOF

(new config need server restart)

  $ killdaemons.py
  $ hg -R ../pull-race serve -p $HGPORT -d --pid-file=../pull-race.pid -E main-error.log
  $ cat ../pull-race.pid >> $DAEMON_PIDS

  $ hg -R $TESTTMP/pull-race book
     @                         1:0d2164f0ce0d
     X                         1:0d2164f0ce0d
   * Y                         5:35d1ef0a8d1b
     Z                         1:0d2164f0ce0d
  $ hg pull -B Y
  pulling from http://localhost:$HGPORT/
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  updating bookmark Y
  (run 'hg update' to get a working copy)
  $ hg book
   * @                         1:0d2164f0ce0d
     X                         1:0d2164f0ce0d
     Y                         5:35d1ef0a8d1b
     Z                         1:0d2164f0ce0d

(done with this section of the test)

  $ killdaemons.py
  $ cd ../b

diverging a remote bookmark fails

  $ hg up -q 4e3505fd9583
  $ echo c4 > f2
  $ hg ci -Am4
  adding f2
  created new head
  $ echo c5 > f2
  $ hg ci -Am5
  $ hg log -G
  @  5:c922c0139ca0 5
  |
  o  4:4efff6d98829 4
  |
  | o  3:f6fc62dde3c0 3
  |/
  | o  2:0d2164f0ce0d 1
  |/
  | o  1:9b140be10808 2
  |/
  o  0:4e3505fd9583 test
  

  $ hg book -f Y

  $ cat <<EOF > ../a/.hg/hgrc
  > [web]
  > push_ssl = false
  > allow_push = *
  > EOF

  $ hg -R ../a serve -p $HGPORT2 -d --pid-file=../hg2.pid
  $ cat ../hg2.pid >> $DAEMON_PIDS

  $ hg push http://localhost:$HGPORT2/
  pushing to http://localhost:$HGPORT2/
  searching for changes
  abort: push creates new remote head c922c0139ca0 with bookmark 'Y'!
  (merge or see "hg help push" for details about pushing new heads)
  [255]
  $ hg -R ../a book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         3:f6fc62dde3c0
     Z                         1:0d2164f0ce0d


Unrelated marker does not alter the decision

  $ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
  $ hg push http://localhost:$HGPORT2/
  pushing to http://localhost:$HGPORT2/
  searching for changes
  abort: push creates new remote head c922c0139ca0 with bookmark 'Y'!
  (merge or see "hg help push" for details about pushing new heads)
  [255]
  $ hg -R ../a book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         3:f6fc62dde3c0
     Z                         1:0d2164f0ce0d

Update to a successor works

  $ hg id --debug -r 3
  f6fc62dde3c0771e29704af56ba4d8af77abcc2f
  $ hg id --debug -r 4
  4efff6d98829d9c824c621afd6e3f01865f5439f
  $ hg id --debug -r 5
  c922c0139ca03858f655e4a2af4dd02796a63969 tip Y
  $ hg debugobsolete f6fc62dde3c0771e29704af56ba4d8af77abcc2f cccccccccccccccccccccccccccccccccccccccc
  $ hg debugobsolete cccccccccccccccccccccccccccccccccccccccc 4efff6d98829d9c824c621afd6e3f01865f5439f
  $ hg push http://localhost:$HGPORT2/
  pushing to http://localhost:$HGPORT2/
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 2 changesets with 2 changes to 1 files (+1 heads)
  remote: 2 new obsolescence markers
  updating bookmark Y
  $ hg -R ../a book
     @                         1:0d2164f0ce0d
   * X                         1:0d2164f0ce0d
     Y                         5:c922c0139ca0
     Z                         1:0d2164f0ce0d

hgweb

  $ cat <<EOF > .hg/hgrc
  > [web]
  > push_ssl = false
  > allow_push = *
  > EOF

  $ hg serve -p $HGPORT -d --pid-file=../hg.pid -E errors.log
  $ cat ../hg.pid >> $DAEMON_PIDS
  $ cd ../a

  $ hg debugpushkey http://localhost:$HGPORT/ namespaces
  bookmarks	
  namespaces	
  obsolete	
  phases	
  $ hg debugpushkey http://localhost:$HGPORT/ bookmarks
  @	9b140be1080824d768c5a4691a564088eede71f9
  X	9b140be1080824d768c5a4691a564088eede71f9
  Y	c922c0139ca03858f655e4a2af4dd02796a63969
  Z	9b140be1080824d768c5a4691a564088eede71f9
  foo	0000000000000000000000000000000000000000
  foobar	9b140be1080824d768c5a4691a564088eede71f9
  $ hg out -B http://localhost:$HGPORT/
  comparing with http://localhost:$HGPORT/
  searching for changed bookmarks
     @                         0d2164f0ce0d
     X                         0d2164f0ce0d
     Z                         0d2164f0ce0d
     foo                                   
     foobar                                
  $ hg push -B Z http://localhost:$HGPORT/
  pushing to http://localhost:$HGPORT/
  searching for changes
  no changes found
  updating bookmark Z
  [1]
  $ hg book -d Z
  $ hg in -B http://localhost:$HGPORT/
  comparing with http://localhost:$HGPORT/
  searching for changed bookmarks
     @                         9b140be10808
     X                         9b140be10808
     Z                         0d2164f0ce0d
     foo                       000000000000
     foobar                    9b140be10808
  $ hg pull -B Z http://localhost:$HGPORT/
  pulling from http://localhost:$HGPORT/
  no changes found
  divergent bookmark @ stored as @1
  divergent bookmark X stored as X@1
  adding remote bookmark Z
  adding remote bookmark foo
  adding remote bookmark foobar
  $ hg clone http://localhost:$HGPORT/ cloned-bookmarks
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 3 files (+2 heads)
  2 new obsolescence markers
  updating to bookmark @
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R cloned-bookmarks bookmarks
   * @                         1:9b140be10808
     X                         1:9b140be10808
     Y                         4:c922c0139ca0
     Z                         2:0d2164f0ce0d
     foo                       -1:000000000000
     foobar                    1:9b140be10808

  $ cd ..

Test to show result of bookmarks comparision

  $ mkdir bmcomparison
  $ cd bmcomparison

  $ hg init source
  $ hg -R source debugbuilddag '+2*2*3*4'
  $ hg -R source log -G --template '{rev}:{node|short}'
  o  4:e7bd5218ca15
  |
  | o  3:6100d3090acf
  |/
  | o  2:fa942426a6fd
  |/
  | o  1:66f7d451a68b
  |/
  o  0:1ea73414a91b
  
  $ hg -R source bookmarks -r 0 SAME
  $ hg -R source bookmarks -r 0 ADV_ON_REPO1
  $ hg -R source bookmarks -r 0 ADV_ON_REPO2
  $ hg -R source bookmarks -r 0 DIFF_ADV_ON_REPO1
  $ hg -R source bookmarks -r 0 DIFF_ADV_ON_REPO2
  $ hg -R source bookmarks -r 1 DIVERGED

  $ hg clone -U source repo1

(test that incoming/outgoing exit with 1, if there is no bookmark to
be exchanged)

  $ hg -R repo1 incoming -B
  comparing with $TESTTMP/bmcomparison/source
  searching for changed bookmarks
  no changed bookmarks found
  [1]
  $ hg -R repo1 outgoing -B
  comparing with $TESTTMP/bmcomparison/source
  searching for changed bookmarks
  no changed bookmarks found
  [1]

  $ hg -R repo1 bookmarks -f -r 1 ADD_ON_REPO1
  $ hg -R repo1 bookmarks -f -r 2 ADV_ON_REPO1
  $ hg -R repo1 bookmarks -f -r 3 DIFF_ADV_ON_REPO1
  $ hg -R repo1 bookmarks -f -r 3 DIFF_DIVERGED
  $ hg -R repo1 -q --config extensions.mq= strip 4
  $ hg -R repo1 log -G --template '{node|short} ({bookmarks})'
  o  6100d3090acf (DIFF_ADV_ON_REPO1 DIFF_DIVERGED)
  |
  | o  fa942426a6fd (ADV_ON_REPO1)
  |/
  | o  66f7d451a68b (ADD_ON_REPO1 DIVERGED)
  |/
  o  1ea73414a91b (ADV_ON_REPO2 DIFF_ADV_ON_REPO2 SAME)
  

  $ hg clone -U source repo2
  $ hg -R repo2 bookmarks -f -r 1 ADD_ON_REPO2
  $ hg -R repo2 bookmarks -f -r 1 ADV_ON_REPO2
  $ hg -R repo2 bookmarks -f -r 2 DIVERGED
  $ hg -R repo2 bookmarks -f -r 4 DIFF_ADV_ON_REPO2
  $ hg -R repo2 bookmarks -f -r 4 DIFF_DIVERGED
  $ hg -R repo2 -q --config extensions.mq= strip 3
  $ hg -R repo2 log -G --template '{node|short} ({bookmarks})'
  o  e7bd5218ca15 (DIFF_ADV_ON_REPO2 DIFF_DIVERGED)
  |
  | o  fa942426a6fd (DIVERGED)
  |/
  | o  66f7d451a68b (ADD_ON_REPO2 ADV_ON_REPO2)
  |/
  o  1ea73414a91b (ADV_ON_REPO1 DIFF_ADV_ON_REPO1 SAME)
  

(test that difference of bookmarks between repositories are fully shown)

  $ hg -R repo1 incoming -B repo2 -v
  comparing with repo2
  searching for changed bookmarks
     ADD_ON_REPO2              66f7d451a68b added
     ADV_ON_REPO2              66f7d451a68b advanced
     DIFF_ADV_ON_REPO2         e7bd5218ca15 changed
     DIFF_DIVERGED             e7bd5218ca15 changed
     DIVERGED                  fa942426a6fd diverged
  $ hg -R repo1 outgoing -B repo2 -v
  comparing with repo2
  searching for changed bookmarks
     ADD_ON_REPO1              66f7d451a68b added
     ADD_ON_REPO2                           deleted
     ADV_ON_REPO1              fa942426a6fd advanced
     DIFF_ADV_ON_REPO1         6100d3090acf advanced
     DIFF_ADV_ON_REPO2         1ea73414a91b changed
     DIFF_DIVERGED             6100d3090acf changed
     DIVERGED                  66f7d451a68b diverged

  $ hg -R repo2 incoming -B repo1 -v
  comparing with repo1
  searching for changed bookmarks
     ADD_ON_REPO1              66f7d451a68b added
     ADV_ON_REPO1              fa942426a6fd advanced
     DIFF_ADV_ON_REPO1         6100d3090acf changed
     DIFF_DIVERGED             6100d3090acf changed
     DIVERGED                  66f7d451a68b diverged
  $ hg -R repo2 outgoing -B repo1 -v
  comparing with repo1
  searching for changed bookmarks
     ADD_ON_REPO1                           deleted
     ADD_ON_REPO2              66f7d451a68b added
     ADV_ON_REPO2              66f7d451a68b advanced
     DIFF_ADV_ON_REPO1         1ea73414a91b changed
     DIFF_ADV_ON_REPO2         e7bd5218ca15 advanced
     DIFF_DIVERGED             e7bd5218ca15 changed
     DIVERGED                  fa942426a6fd diverged

  $ cd ..

Pushing a bookmark should only push the changes required by that
bookmark, not all outgoing changes:
  $ hg clone http://localhost:$HGPORT/ addmarks
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 3 files (+2 heads)
  2 new obsolescence markers
  updating to bookmark @
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd addmarks
  $ echo foo > foo
  $ hg add foo
  $ hg commit -m 'add foo'
  $ echo bar > bar
  $ hg add bar
  $ hg commit -m 'add bar'
  $ hg co "tip^"
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (leaving bookmark @)
  $ hg book add-foo
  $ hg book -r tip add-bar
Note: this push *must* push only a single changeset, as that's the point
of this test.
  $ hg push -B add-foo --traceback
  pushing to http://localhost:$HGPORT/
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 1 changes to 1 files
  exporting bookmark add-foo

pushing a new bookmark on a new head does not require -f if -B is specified

  $ hg up -q X
  $ hg book W
  $ echo c5 > f2
  $ hg ci -Am5
  created new head
  $ hg push -B W
  pushing to http://localhost:$HGPORT/
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 1 changes to 1 files (+1 heads)
  exporting bookmark W
  $ hg -R ../b id -r W
  cc978a373a53 tip W

pushing an existing but divergent bookmark with -B still requires -f

  $ hg clone -q . ../r
  $ hg up -q X
  $ echo 1 > f2
  $ hg ci -qAml

  $ cd ../r
  $ hg up -q X
  $ echo 2 > f2
  $ hg ci -qAmr
  $ hg push -B X
  pushing to $TESTTMP/addmarks (glob)
  searching for changes
  remote has heads on branch 'default' that are not known locally: a2a606d9ff1b
  abort: push creates new remote head 54694f811df9 with bookmark 'X'!
  (pull and merge or see "hg help push" for details about pushing new heads)
  [255]
  $ cd ../addmarks

Check summary output for incoming/outgoing bookmarks

  $ hg bookmarks -d X
  $ hg bookmarks -d Y
  $ hg summary --remote | grep '^remote:'
  remote: *, 2 incoming bookmarks, 1 outgoing bookmarks (glob)

  $ cd ..

pushing an unchanged bookmark should result in no changes

  $ hg init unchanged-a
  $ hg init unchanged-b
  $ cd unchanged-a
  $ echo initial > foo
  $ hg commit -A -m initial
  adding foo
  $ hg bookmark @
  $ hg push -B @ ../unchanged-b
  pushing to ../unchanged-b
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  exporting bookmark @

  $ hg push -B @ ../unchanged-b
  pushing to ../unchanged-b
  searching for changes
  no changes found
  [1]


Check hook preventing push (issue4455)
======================================

  $ hg bookmarks
   * @                         0:55482a6fb4b1
  $ hg log -G
  @  0:55482a6fb4b1 initial
  
  $ hg init ../issue4455-dest
  $ hg push ../issue4455-dest # changesets only
  pushing to ../issue4455-dest
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  $ cat >> .hg/hgrc << EOF
  > [paths]
  > local=../issue4455-dest/
  > ssh=ssh://user@dummy/issue4455-dest
  > http=http://localhost:$HGPORT/
  > [ui]
  > ssh=python "$TESTDIR/dummyssh"
  > EOF
  $ cat >> ../issue4455-dest/.hg/hgrc << EOF
  > [hooks]
  > prepushkey=false
  > [web]
  > push_ssl = false
  > allow_push = *
  > EOF
  $ killdaemons.py
  $ hg -R ../issue4455-dest serve -p $HGPORT -d --pid-file=../issue4455.pid -E ../issue4455-error.log
  $ cat ../issue4455.pid >> $DAEMON_PIDS

Local push
----------

  $ hg push -B @ local
  pushing to $TESTTMP/issue4455-dest (glob)
  searching for changes
  no changes found
  pushkey-abort: prepushkey hook exited with status 1
  abort: exporting bookmark @ failed!
  [255]
  $ hg -R ../issue4455-dest/ bookmarks
  no bookmarks set

Using ssh
---------

  $ hg push -B @ ssh --config experimental.bundle2-exp=True
  pushing to ssh://user@dummy/issue4455-dest
  searching for changes
  no changes found
  remote: pushkey-abort: prepushkey hook exited with status 1
  abort: exporting bookmark @ failed!
  [255]
  $ hg -R ../issue4455-dest/ bookmarks
  no bookmarks set

  $ hg push -B @ ssh --config experimental.bundle2-exp=False
  pushing to ssh://user@dummy/issue4455-dest
  searching for changes
  no changes found
  remote: pushkey-abort: prepushkey hook exited with status 1
  exporting bookmark @ failed!
  [1]
  $ hg -R ../issue4455-dest/ bookmarks
  no bookmarks set

Using http
----------

  $ hg push -B @ http --config experimental.bundle2-exp=True
  pushing to http://localhost:$HGPORT/
  searching for changes
  no changes found
  remote: pushkey-abort: prepushkey hook exited with status 1
  abort: exporting bookmark @ failed!
  [255]
  $ hg -R ../issue4455-dest/ bookmarks
  no bookmarks set

  $ hg push -B @ http --config experimental.bundle2-exp=False
  pushing to http://localhost:$HGPORT/
  searching for changes
  no changes found
  remote: pushkey-abort: prepushkey hook exited with status 1
  exporting bookmark @ failed!
  [1]
  $ hg -R ../issue4455-dest/ bookmarks
  no bookmarks set