upstream/mercurial-mirror Files · tests/test-update-branches.t

sslutil: require TLS 1.1+ when supported...

sslutil: require TLS 1.1+ when supported Currently, Mercurial will use TLS 1.0 or newer when connecting to remote servers, selecting the highest TLS version supported by both peers. On older Pythons, only TLS 1.0 is available. On newer Pythons, TLS 1.1 and 1.2 should be available. Security professionals recommend avoiding TLS 1.0 if possible. PCI DSS 3.1 "strongly encourages" the use of TLS 1.2. Known attacks like BEAST and POODLE exist against TLS 1.0 (although mitigations are available and properly configured servers aren't vulnerable). I asked Eric Rescorla - Mozilla's resident crypto expert - whether Mercurial should drop support for TLS 1.0. His response was "if you can get away with it." Essentially, a number of servers on the Internet don't support TLS 1.1+. This is why web browsers continue to support TLS 1.0 despite desires from security experts. This patch changes Mercurial's default behavior on modern Python versions to require TLS 1.1+, thus avoiding known security issues with TLS 1.0 and making Mercurial more secure by default. Rather than drop TLS 1.0 support wholesale, we still allow TLS 1.0 to be used if configured. This is a compromise solution - ideally we'd disallow TLS 1.0. However, since we're not sure how many Mercurial servers don't support TLS 1.1+ and we're not sure how much user inconvenience this change will bring, I think it is prudent to ship an escape hatch that still allows usage of TLS 1.0. In the default case our users get better security. In the worst case, they are no worse off than before this patch. This patch has no effect when running on Python versions that don't support TLS 1.1+. As the added test shows, connecting to a server that doesn't support TLS 1.1+ will display a warning message with a link to our wiki, where we can guide people to configure their client to allow less secure connections.

FUJIWARA Katsunori - - Load All Authors

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      # Construct the following history tree:

      #

      # @  5:e1bb631146ca  b1

      # |

      # o  4:a4fdb3b883c4 0:b608b9236435  b1

      # |

      # | o  3:4b57d2520816 1:44592833ba9f

      # | |

      # | | o  2:063f31070f65

      # | |/

      # | o  1:44592833ba9f

      # |/

      # o  0:b608b9236435

        $ mkdir b1

        $ cd b1

        $ hg init

        $ echo foo > foo

        $ echo zero > a

        $ hg init sub

        $ echo suba > sub/suba

        $ hg --cwd sub ci -Am addsuba

        adding suba

        $ echo 'sub = sub' > .hgsub

        $ hg ci -qAm0

        $ echo one > a ; hg ci -m1

        $ echo two > a ; hg ci -m2

        $ hg up -q 1

        $ echo three > a ; hg ci -qm3

        $ hg up -q 0

        $ hg branch -q b1

        $ echo four > a ; hg ci -qm4

        $ echo five > a ; hg ci -qm5

      Initial repo state:

        $ hg log -G --template '{rev}:{node|short} {parents} {branches}\n'

        @  5:ff252e8273df  b1

        |

        o  4:d047485b3896 0:60829823a42a  b1

        |

        | o  3:6efa171f091b 1:0786582aa4b1

        | |

        | | o  2:bd10386d478c

        | |/

        | o  1:0786582aa4b1

        |/

        o  0:60829823a42a

      Make sure update doesn't assume b1 is a repository if invoked from outside:

        $ cd ..

        $ hg update b1

        abort: no repository found in '$TESTTMP' (.hg not found)!

        [255]

        $ cd b1

      Test helper functions:

        $ revtest () {

        >     msg=$1

        >     dirtyflag=$2   # 'clean', 'dirty' or 'dirtysub'

        >     startrev=$3

        >     targetrev=$4

        >     opt=$5

        >     hg up -qC $startrev

        >     test $dirtyflag = dirty && echo dirty > foo

        >     test $dirtyflag = dirtysub && echo dirty > sub/suba

        >     hg up $opt $targetrev

        >     hg parent --template 'parent={rev}\n'

        >     hg stat -S

        > }

        $ norevtest () {

        >     msg=$1

        >     dirtyflag=$2   # 'clean', 'dirty' or 'dirtysub'

        >     startrev=$3

        >     opt=$4

        >     hg up -qC $startrev

        >     test $dirtyflag = dirty && echo dirty > foo

        >     test $dirtyflag = dirtysub && echo dirty > sub/suba

        >     hg up $opt

        >     hg parent --template 'parent={rev}\n'

        >     hg stat -S

        > }

      Test cases are documented in a table in the update function of merge.py.

      Cases are run as shown in that table, row by row.

        $ norevtest 'none clean linear' clean 4

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

        parent=5

        $ norevtest 'none clean same'   clean 2

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

        1 other heads for branch "default"

        parent=2

        $ revtest 'none clean linear' clean 1 2

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

        parent=2

        $ revtest 'none clean same'   clean 2 3

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

        parent=3

        $ revtest 'none clean cross'  clean 3 4

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

        parent=4

        $ revtest 'none dirty linear' dirty 1 2

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

        parent=2

        M foo

        $ revtest 'none dirtysub linear' dirtysub 1 2

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

        parent=2

        M sub/suba

        $ revtest 'none dirty same'   dirty 2 3

        abort: uncommitted changes

        (commit or update --clean to discard changes)

        parent=2

        M foo

        $ revtest 'none dirtysub same'   dirtysub 2 3

        abort: uncommitted changes

        (commit or update --clean to discard changes)

        parent=2

        M sub/suba

        $ revtest 'none dirty cross'  dirty 3 4

        abort: uncommitted changes

        (commit or update --clean to discard changes)

        parent=3

        M foo

        $ norevtest 'none dirty cross'  dirty 2

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

        1 other heads for branch "default"

        parent=2

        M foo

        $ revtest 'none dirtysub cross'  dirtysub 3 4

        abort: uncommitted changes

        (commit or update --clean to discard changes)

        parent=3

        M sub/suba

        $ revtest '-C dirty linear'   dirty 1 2 -C

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

        parent=2

        $ revtest '-c dirty linear'   dirty 1 2 -c

        abort: uncommitted changes

        parent=1

        M foo

        $ revtest '-c dirtysub linear'   dirtysub 1 2 -c

        abort: uncommitted changes in subrepository 'sub'

        parent=1

        M sub/suba

        $ norevtest '-c clean same'   clean 2 -c

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

        1 other heads for branch "default"

        parent=2

        $ revtest '-cC dirty linear'  dirty 1 2 -cC

        abort: cannot specify both -c/--check and -C/--clean

        parent=1

        M foo

        $ cd ..

      Test updating with closed head

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

        $ hg clone -U -q b1 closed-heads

        $ cd closed-heads

      Test updating if at least one non-closed branch head exists

      if on the closed branch head:

      - update to "."

      - "updated to a closed branch head ...." message is displayed

      - "N other heads for ...." message is displayed

        $ hg update -q -C 3

        $ hg commit --close-branch -m 6

        $ norevtest "on closed branch head" clean 6

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

        no open descendant heads on branch "default", updating to a closed head

        (committing will reopen the head, use `hg heads .` to see 1 other heads)

        parent=6

      if descendant non-closed branch head exists, and it is only one branch head:

      - update to it, even if its revision is less than closed one

      - "N other heads for ...." message isn't displayed

        $ norevtest "non-closed 2 should be chosen" clean 1

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

        parent=2

      if all descendant branch heads are closed, but there is another branch head:

      - update to the tipmost descendant head

      - "updated to a closed branch head ...." message is displayed

      - "N other heads for ...." message is displayed

        $ norevtest "all descendant branch heads are closed" clean 3

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

        no open descendant heads on branch "default", updating to a closed head

        (committing will reopen the head, use `hg heads .` to see 1 other heads)

        parent=6

      Test updating if all branch heads are closed

      if on the closed branch head:

      - update to "."

      - "updated to a closed branch head ...." message is displayed

      - "all heads of branch ...." message is displayed

        $ hg update -q -C 2

        $ hg commit --close-branch -m 7

        $ norevtest "all heads of branch default are closed" clean 6

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

        no open descendant heads on branch "default", updating to a closed head

        (committing will reopen branch "default")

        parent=6

      if not on the closed branch head:

      - update to the tipmost descendant (closed) head

      - "updated to a closed branch head ...." message is displayed

      - "all heads of branch ...." message is displayed

        $ norevtest "all heads of branch default are closed" clean 1

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

        no open descendant heads on branch "default", updating to a closed head

        (committing will reopen branch "default")

        parent=7

        $ cd ..

      Test updating if "default" branch doesn't exist and no revision is

      checked out (= "default" is used as current branch)

        $ hg init no-default-branch

        $ cd no-default-branch

        $ hg branch foobar

        marked working directory as branch foobar

        (branches are permanent and global, did you want a bookmark?)

        $ echo a > a

        $ hg commit -m "#0" -A

        adding a

        $ echo 1 >> a

        $ hg commit -m "#1"

        $ hg update -q 0

        $ echo 3 >> a

        $ hg commit -m "#2"

        created new head

        $ hg commit --close-branch -m "#3"

      if there is at least one non-closed branch head:

      - update to the tipmost branch head

        $ norevtest "non-closed 1 should be chosen" clean null

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

        parent=1

      if all branch heads are closed

      - update to "tip"

      - "updated to a closed branch head ...." message is displayed

      - "all heads for branch "XXXX" are closed" message is displayed

        $ hg update -q -C 1

        $ hg commit --close-branch -m "#4"

        $ norevtest "all branches are closed" clean null

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

        no open descendant heads on branch "foobar", updating to a closed head

        (committing will reopen branch "foobar")

        parent=4

        $ cd ../b1

      Test obsolescence behavior

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

      successors should be taken in account when checking head destination

        $ cat << EOF >> $HGRCPATH

        > [ui]

        > logtemplate={rev}:{node|short} {desc|firstline}

        > [experimental]

        > evolution=createmarkers

        > EOF

      Test no-argument update to a successor of an obsoleted changeset

        $ hg log -G

        o  5:ff252e8273df 5

        |

        o  4:d047485b3896 4

        |

        | o  3:6efa171f091b 3

        | |

        | | o  2:bd10386d478c 2

        | |/

        | @  1:0786582aa4b1 1

        |/

        o  0:60829823a42a 0

        $ hg book bm -r 3

        $ hg status

        M foo

      We add simple obsolescence marker between 3 and 4 (indirect successors)

        $ hg id --debug -i -r 3

        6efa171f091b00a3c35edc15d48c52a498929953

        $ hg id --debug -i -r 4

        d047485b3896813b2a624e86201983520f003206

        $ hg debugobsolete 6efa171f091b00a3c35edc15d48c52a498929953 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

        $ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa d047485b3896813b2a624e86201983520f003206

      Test that 5 is detected as a valid destination from 3 and also accepts moving

      the bookmark (issue4015)

        $ hg up --quiet --hidden 3

        $ hg up 5

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

        $ hg book bm

        moving bookmark 'bm' forward from 6efa171f091b

        $ hg bookmarks

         * bm                        5:ff252e8273df

      Test that 4 is detected as the no-argument destination from 3 and also moves

      the bookmark with it

        $ hg up --quiet 0          # we should be able to update to 3 directly

        $ hg up --quiet --hidden 3 # but not implemented yet.

        $ hg book -f bm

        $ hg up

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

        updating bookmark bm

        $ hg book

         * bm                        4:d047485b3896

      Test that 5 is detected as a valid destination from 1

        $ hg up --quiet 0          # we should be able to update to 3 directly

        $ hg up --quiet --hidden 3 # but not implemented yet.

        $ hg up 5

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

      Test that 5 is not detected as a valid destination from 2

        $ hg up --quiet 0

        $ hg up --quiet 2

        $ hg up 5

        abort: uncommitted changes

        (commit or update --clean to discard changes)

        [255]

      Test that we don't crash when updating from a pruned changeset (i.e. has no

      successors). Behavior should probably be that we update to the first

      non-obsolete parent but that will be decided later.

        $ hg id --debug -r 2

        bd10386d478cd5a9faf2e604114c8e6da62d3889

        $ hg up --quiet 0

        $ hg up --quiet 2

        $ hg debugobsolete bd10386d478cd5a9faf2e604114c8e6da62d3889

        $ hg up

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

      Test experimental revset support

        $ hg log -r '_destupdate()'

        2:bd10386d478c 2 (no-eol)

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				# Construct the following history tree:
				#
				# @ 5:e1bb631146ca b1
				# \|
				# o 4:a4fdb3b883c4 0:b608b9236435 b1
				# \|
				# \| o 3:4b57d2520816 1:44592833ba9f
				# \| \|
				# \| \| o 2:063f31070f65
				# \| \|/
				# \| o 1:44592833ba9f
				# \|/
				# o 0:b608b9236435

				$ mkdir b1
				$ cd b1
				$ hg init
				$ echo foo > foo
				$ echo zero > a
				$ hg init sub
				$ echo suba > sub/suba
				$ hg --cwd sub ci -Am addsuba
				adding suba
				$ echo 'sub = sub' > .hgsub
				$ hg ci -qAm0
				$ echo one > a ; hg ci -m1
				$ echo two > a ; hg ci -m2
				$ hg up -q 1
				$ echo three > a ; hg ci -qm3
				$ hg up -q 0
				$ hg branch -q b1
				$ echo four > a ; hg ci -qm4
				$ echo five > a ; hg ci -qm5

				Initial repo state:

				$ hg log -G --template '{rev}:{node\|short} {parents} {branches}\n'
				@ 5:ff252e8273df b1
				\|
				o 4:d047485b3896 0:60829823a42a b1
				\|
				\| o 3:6efa171f091b 1:0786582aa4b1
				\| \|
				\| \| o 2:bd10386d478c
				\| \|/
				\| o 1:0786582aa4b1
				\|/
				o 0:60829823a42a


				Make sure update doesn't assume b1 is a repository if invoked from outside:

				$ cd ..
				$ hg update b1
				abort: no repository found in '$TESTTMP' (.hg not found)!
				[255]
				$ cd b1

				Test helper functions:

				$ revtest () {
				> msg=$1
				> dirtyflag=$2 # 'clean', 'dirty' or 'dirtysub'
				> startrev=$3
				> targetrev=$4
				> opt=$5
				> hg up -qC $startrev
				> test $dirtyflag = dirty && echo dirty > foo
				> test $dirtyflag = dirtysub && echo dirty > sub/suba
				> hg up $opt $targetrev
				> hg parent --template 'parent={rev}\n'
				> hg stat -S
				> }

				$ norevtest () {
				> msg=$1
				> dirtyflag=$2 # 'clean', 'dirty' or 'dirtysub'
				> startrev=$3
				> opt=$4
				> hg up -qC $startrev
				> test $dirtyflag = dirty && echo dirty > foo
				> test $dirtyflag = dirtysub && echo dirty > sub/suba
				> hg up $opt
				> hg parent --template 'parent={rev}\n'
				> hg stat -S
				> }

				Test cases are documented in a table in the update function of merge.py.
				Cases are run as shown in that table, row by row.

				$ norevtest 'none clean linear' clean 4
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=5

				$ norevtest 'none clean same' clean 2
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				1 other heads for branch "default"
				parent=2


				$ revtest 'none clean linear' clean 1 2
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=2

				$ revtest 'none clean same' clean 2 3
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=3

				$ revtest 'none clean cross' clean 3 4
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=4


				$ revtest 'none dirty linear' dirty 1 2
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=2
				M foo

				$ revtest 'none dirtysub linear' dirtysub 1 2
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=2
				M sub/suba

				$ revtest 'none dirty same' dirty 2 3
				abort: uncommitted changes
				(commit or update --clean to discard changes)
				parent=2
				M foo

				$ revtest 'none dirtysub same' dirtysub 2 3
				abort: uncommitted changes
				(commit or update --clean to discard changes)
				parent=2
				M sub/suba

				$ revtest 'none dirty cross' dirty 3 4
				abort: uncommitted changes
				(commit or update --clean to discard changes)
				parent=3
				M foo

				$ norevtest 'none dirty cross' dirty 2
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				1 other heads for branch "default"
				parent=2
				M foo

				$ revtest 'none dirtysub cross' dirtysub 3 4
				abort: uncommitted changes
				(commit or update --clean to discard changes)
				parent=3
				M sub/suba

				$ revtest '-C dirty linear' dirty 1 2 -C
				2 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=2

				$ revtest '-c dirty linear' dirty 1 2 -c
				abort: uncommitted changes
				parent=1
				M foo

				$ revtest '-c dirtysub linear' dirtysub 1 2 -c
				abort: uncommitted changes in subrepository 'sub'
				parent=1
				M sub/suba

				$ norevtest '-c clean same' clean 2 -c
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				1 other heads for branch "default"
				parent=2

				$ revtest '-cC dirty linear' dirty 1 2 -cC
				abort: cannot specify both -c/--check and -C/--clean
				parent=1
				M foo

				$ cd ..

				Test updating with closed head
				---------------------------------------------------------------------

				$ hg clone -U -q b1 closed-heads
				$ cd closed-heads

				Test updating if at least one non-closed branch head exists

				if on the closed branch head:
				- update to "."
				- "updated to a closed branch head ...." message is displayed
				- "N other heads for ...." message is displayed

				$ hg update -q -C 3
				$ hg commit --close-branch -m 6
				$ norevtest "on closed branch head" clean 6
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				no open descendant heads on branch "default", updating to a closed head
				(committing will reopen the head, use `hg heads .` to see 1 other heads)
				parent=6

				if descendant non-closed branch head exists, and it is only one branch head:
				- update to it, even if its revision is less than closed one
				- "N other heads for ...." message isn't displayed

				$ norevtest "non-closed 2 should be chosen" clean 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=2

				if all descendant branch heads are closed, but there is another branch head:
				- update to the tipmost descendant head
				- "updated to a closed branch head ...." message is displayed
				- "N other heads for ...." message is displayed

				$ norevtest "all descendant branch heads are closed" clean 3
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				no open descendant heads on branch "default", updating to a closed head
				(committing will reopen the head, use `hg heads .` to see 1 other heads)
				parent=6

				Test updating if all branch heads are closed

				if on the closed branch head:
				- update to "."
				- "updated to a closed branch head ...." message is displayed
				- "all heads of branch ...." message is displayed

				$ hg update -q -C 2
				$ hg commit --close-branch -m 7
				$ norevtest "all heads of branch default are closed" clean 6
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved
				no open descendant heads on branch "default", updating to a closed head
				(committing will reopen branch "default")
				parent=6

				if not on the closed branch head:
				- update to the tipmost descendant (closed) head
				- "updated to a closed branch head ...." message is displayed
				- "all heads of branch ...." message is displayed

				$ norevtest "all heads of branch default are closed" clean 1
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				no open descendant heads on branch "default", updating to a closed head
				(committing will reopen branch "default")
				parent=7

				$ cd ..

				Test updating if "default" branch doesn't exist and no revision is
				checked out (= "default" is used as current branch)

				$ hg init no-default-branch
				$ cd no-default-branch

				$ hg branch foobar
				marked working directory as branch foobar
				(branches are permanent and global, did you want a bookmark?)
				$ echo a > a
				$ hg commit -m "#0" -A
				adding a
				$ echo 1 >> a
				$ hg commit -m "#1"
				$ hg update -q 0
				$ echo 3 >> a
				$ hg commit -m "#2"
				created new head
				$ hg commit --close-branch -m "#3"

				if there is at least one non-closed branch head:
				- update to the tipmost branch head

				$ norevtest "non-closed 1 should be chosen" clean null
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				parent=1

				if all branch heads are closed
				- update to "tip"
				- "updated to a closed branch head ...." message is displayed
				- "all heads for branch "XXXX" are closed" message is displayed

				$ hg update -q -C 1
				$ hg commit --close-branch -m "#4"

				$ norevtest "all branches are closed" clean null
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				no open descendant heads on branch "foobar", updating to a closed head
				(committing will reopen branch "foobar")
				parent=4

				$ cd ../b1

				Test obsolescence behavior
				---------------------------------------------------------------------

				successors should be taken in account when checking head destination

				$ cat << EOF >> $HGRCPATH
				> [ui]
				> logtemplate={rev}:{node\|short} {desc\|firstline}
				> [experimental]
				> evolution=createmarkers
				> EOF

				Test no-argument update to a successor of an obsoleted changeset

				$ hg log -G
				o 5:ff252e8273df 5
				\|
				o 4:d047485b3896 4
				\|
				\| o 3:6efa171f091b 3
				\| \|
				\| \| o 2:bd10386d478c 2
				\| \|/
				\| @ 1:0786582aa4b1 1
				\|/
				o 0:60829823a42a 0

				$ hg book bm -r 3
				$ hg status
				M foo

				We add simple obsolescence marker between 3 and 4 (indirect successors)

				$ hg id --debug -i -r 3
				6efa171f091b00a3c35edc15d48c52a498929953
				$ hg id --debug -i -r 4
				d047485b3896813b2a624e86201983520f003206
				$ hg debugobsolete 6efa171f091b00a3c35edc15d48c52a498929953 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
				$ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa d047485b3896813b2a624e86201983520f003206

				Test that 5 is detected as a valid destination from 3 and also accepts moving
				the bookmark (issue4015)

				$ hg up --quiet --hidden 3
				$ hg up 5
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				$ hg book bm
				moving bookmark 'bm' forward from 6efa171f091b
				$ hg bookmarks
				* bm 5:ff252e8273df

				Test that 4 is detected as the no-argument destination from 3 and also moves
				the bookmark with it
				$ hg up --quiet 0 # we should be able to update to 3 directly
				$ hg up --quiet --hidden 3 # but not implemented yet.
				$ hg book -f bm
				$ hg up
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				updating bookmark bm
				$ hg book
				* bm 4:d047485b3896

				Test that 5 is detected as a valid destination from 1
				$ hg up --quiet 0 # we should be able to update to 3 directly
				$ hg up --quiet --hidden 3 # but not implemented yet.
				$ hg up 5
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved

				Test that 5 is not detected as a valid destination from 2
				$ hg up --quiet 0
				$ hg up --quiet 2
				$ hg up 5
				abort: uncommitted changes
				(commit or update --clean to discard changes)
				[255]

				Test that we don't crash when updating from a pruned changeset (i.e. has no
				successors). Behavior should probably be that we update to the first
				non-obsolete parent but that will be decided later.
				$ hg id --debug -r 2
				bd10386d478cd5a9faf2e604114c8e6da62d3889
				$ hg up --quiet 0
				$ hg up --quiet 2
				$ hg debugobsolete bd10386d478cd5a9faf2e604114c8e6da62d3889
				$ hg up
				0 files updated, 0 files merged, 0 files removed, 0 files unresolved

				Test experimental revset support

				$ hg log -r '_destupdate()'
				2:bd10386d478c 2 (no-eol)