monoblue: provide links to branches, tags and bookmarks by name
This is adapted from
cd842821db2c, that was added to paper for 3.5 release.
It adds another way to refer to branches, tags and bookmarks in urls: by name.
It's still possible to navigate to a specific changeset hash, but now you can
get more descriptive urls straight from /summary page, for example.
branchentry template (and so the whole branches table on /summary and
/branches) lost the column that had a plain changeset hash, because tags and
bookmarks don't have this column and also because there is already a way to
address branch by its changeset hash (changeset link just next to it). Maybe we
can instead bring this column with a plain changeset hash to tags and
bookmarks, but this, more terse, new look feels fine.
$ echo "[extensions]" >> $HGRCPATH
$ echo "strip=" >> $HGRCPATH
$ restore() {
> hg unbundle -q .hg/strip-backup/*
> rm .hg/strip-backup/*
> }
$ teststrip() {
> hg up -C $1
> echo % before update $1, strip $2
> hg parents
> hg --traceback strip $2
> echo % after update $1, strip $2
> hg parents
> restore
> }
$ hg init test
$ cd test
$ echo foo > bar
$ hg ci -Ama
adding bar
$ echo more >> bar
$ hg ci -Amb
$ echo blah >> bar
$ hg ci -Amc
$ hg up 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo blah >> bar
$ hg ci -Amd
created new head
$ echo final >> bar
$ hg ci -Ame
$ hg log
changeset: 4:443431ffac4f
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
changeset: 3:65bd5f99a4a3
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: d
changeset: 2:264128213d29
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ teststrip 4 4
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 4
changeset: 4:443431ffac4f
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update 4, strip 4
changeset: 3:65bd5f99a4a3
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: d
$ teststrip 4 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 3
changeset: 4:443431ffac4f
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update 4, strip 3
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ teststrip 1 4
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 1, strip 4
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update 1, strip 4
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ teststrip 4 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 2
changeset: 4:443431ffac4f
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update 4, strip 2
changeset: 3:443431ffac4f
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
$ teststrip 4 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% before update 4, strip 1
changeset: 4:264128213d29
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update 4, strip 1
changeset: 0:9ab35a2d17cb
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ teststrip null 4
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% before update null, strip 4
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
% after update null, strip 4
$ hg log
changeset: 4:264128213d29
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
changeset: 3:443431ffac4f
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: e
changeset: 2:65bd5f99a4a3
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: d
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ hg up -C 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg parents
changeset: 4:264128213d29
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
$ hg --config experimental.bundle2-exp=True --config experimental.strip-bundle2-version=INVALID strip 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
unknown strip-bundle2-version value 'INVALID'; should be one of ['01', '02']
saved backup bundle to $TESTTMP/test/.hg/strip-backup/264128213d29-0b39d6bf-backup.hg (glob)
$ hg debugbundle .hg/strip-backup/*
264128213d290d868c54642d13aeaa3675551a78
$ restore
$ hg up -C 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --config experimental.bundle2-exp=True --config experimental.strip-bundle2-version=02 --traceback strip 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/264128213d29-0b39d6bf-backup.hg (glob)
$ hg parents
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ hg debugbundle .hg/strip-backup/*
Stream params: {}
changegroup -- "{'version': '02'}"
264128213d290d868c54642d13aeaa3675551a78
$ hg incoming .hg/strip-backup/*
comparing with .hg/strip-backup/264128213d29-0b39d6bf-backup.hg
searching for changes
changeset: 4:264128213d29
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
$ restore
$ hg up -C 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --config experimental.bundle2-exp=True --config experimental.strip-bundle2-version=02 --traceback strip 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/264128213d29-0b39d6bf-backup.hg (glob)
$ hg parents
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ hg debugbundle .hg/strip-backup/*
Stream params: {}
changegroup -- "{'version': '02'}"
264128213d290d868c54642d13aeaa3675551a78
$ hg pull .hg/strip-backup/*
pulling from .hg/strip-backup/264128213d29-0b39d6bf-backup.hg
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ rm .hg/strip-backup/*
$ hg log --graph
o changeset: 4:264128213d29
| tag: tip
| parent: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
| o changeset: 3:443431ffac4f
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: e
| |
| o changeset: 2:65bd5f99a4a3
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
@ changeset: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ hg up -C 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 4
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
before strip of merge parent
$ hg parents
changeset: 2:65bd5f99a4a3
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: d
changeset: 4:264128213d29
tag: tip
parent: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
$ hg strip 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
after strip of merge parent
$ hg parents
changeset: 1:ef3a871183d7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ restore
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg log -G
@ changeset: 4:264128213d29
| tag: tip
| parent: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
| o changeset: 3:443431ffac4f
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: e
| |
| o changeset: 2:65bd5f99a4a3
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
o changeset: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
2 is parent of 3, only one strip should happen
$ hg strip "roots(2)" 3
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ hg log -G
@ changeset: 2:264128213d29
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
o changeset: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ restore
$ hg log -G
o changeset: 4:443431ffac4f
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: e
|
o changeset: 3:65bd5f99a4a3
| parent: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
| @ changeset: 2:264128213d29
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
o changeset: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
2 different branches: 2 strips
$ hg strip 2 4
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ hg log -G
o changeset: 2:65bd5f99a4a3
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
@ changeset: 1:ef3a871183d7
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ restore
2 different branches and a common ancestor: 1 strip
$ hg strip 1 "2|4"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ restore
verify fncache is kept up-to-date
$ touch a
$ hg ci -qAm a
$ cat .hg/store/fncache | sort
data/a.i
data/bar.i
$ hg strip tip
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ cat .hg/store/fncache
data/bar.i
stripping an empty revset
$ hg strip "1 and not 1"
abort: empty revision set
[255]
remove branchy history for qimport tests
$ hg strip 3
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
strip of applied mq should cleanup status file
$ echo "mq=" >> $HGRCPATH
$ hg up -C 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo fooagain >> bar
$ hg ci -mf
$ hg qimport -r tip:2
applied patches before strip
$ hg qapplied
2.diff
3.diff
4.diff
stripping revision in queue
$ hg strip 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
applied patches after stripping rev in queue
$ hg qapplied
2.diff
stripping ancestor of queue
$ hg strip 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
applied patches after stripping ancestor of queue
$ hg qapplied
Verify strip protects against stripping wc parent when there are uncommitted mods
$ echo b > b
$ echo bb > bar
$ hg add b
$ hg ci -m 'b'
$ hg log --graph
@ changeset: 1:76dcf9fab855
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:9ab35a2d17cb
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ hg up 0
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo c > bar
$ hg up -t false
merging bar
merging bar failed!
1 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
[1]
$ hg sum
parent: 1:76dcf9fab855 tip
b
branch: default
commit: 1 modified, 1 unknown, 1 unresolved
update: (current)
phases: 2 draft
mq: 3 unapplied
$ echo c > b
$ hg strip tip
abort: local changes found
[255]
$ hg strip tip --keep
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ hg log --graph
@ changeset: 0:9ab35a2d17cb
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ hg status
M bar
? b
? bar.orig
$ rm bar.orig
$ hg sum
parent: 0:9ab35a2d17cb tip
a
branch: default
commit: 1 modified, 1 unknown
update: (current)
phases: 1 draft
mq: 3 unapplied
Strip adds, removes, modifies with --keep
$ touch b
$ hg add b
$ hg commit -mb
$ touch c
... with a clean working dir
$ hg add c
$ hg rm bar
$ hg commit -mc
$ hg status
$ hg strip --keep tip
saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
$ hg status
! bar
? c
... with a dirty working dir
$ hg add c
$ hg rm bar
$ hg commit -mc
$ hg status
$ echo b > b
$ echo d > d
$ hg strip --keep tip
saved backup bundle to $TESTTMP/test/.hg/strip-backup/57e364c8a475-4cfed93c-backup.hg (glob)
$ hg status
M b
! bar
? c
? d
$ cd ..
stripping many nodes on a complex graph (issue3299)
$ hg init issue3299
$ cd issue3299
$ hg debugbuilddag '@a.:a@b.:b.:x<a@a.:a<b@b.:b<a@a.:a'
$ hg strip 'not ancestors(x)'
saved backup bundle to $TESTTMP/issue3299/.hg/strip-backup/*-backup.hg (glob)
test hg strip -B bookmark
$ cd ..
$ hg init bookmarks
$ cd bookmarks
$ hg debugbuilddag '..<2.*1/2:m<2+3:c<m+3:a<2.:b'
$ hg bookmark -r 'a' 'todelete'
$ hg bookmark -r 'b' 'B'
$ hg bookmark -r 'b' 'nostrip'
$ hg bookmark -r 'c' 'delete'
$ hg up -C todelete
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark todelete)
$ hg strip -B nostrip
bookmark 'nostrip' deleted
abort: empty revision set
[255]
$ hg strip -B todelete
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/*-backup.hg (glob)
bookmark 'todelete' deleted
$ hg id -ir dcbb326fdec2
abort: unknown revision 'dcbb326fdec2'!
[255]
$ hg id -ir d62d843c9a01
d62d843c9a01
$ hg bookmarks
B 9:ff43616e5d0f
delete 6:2702dd0c91e7
$ hg strip -B delete
saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/*-backup.hg (glob)
bookmark 'delete' deleted
$ hg id -ir 6:2702dd0c91e7
abort: unknown revision '2702dd0c91e7'!
[255]
$ hg update B
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark B)
$ echo a > a
$ hg add a
$ hg strip -B B
abort: local changes found
[255]
$ hg bookmarks
* B 6:ff43616e5d0f
Make sure no one adds back a -b option:
$ hg strip -b tip
hg strip: option -b not recognized
hg strip [-k] [-f] [-n] [-B bookmark] [-r] REV...
strip changesets and all their descendants from the repository
(use "hg help -e strip" to show help for the strip extension)
options ([+] can be repeated):
-r --rev REV [+] strip specified revision (optional, can specify revisions
without this option)
-f --force force removal of changesets, discard uncommitted changes
(no backup)
--no-backup no backups
-k --keep do not modify working directory during strip
-B --bookmark VALUE remove revs only reachable from given bookmark
--mq operate on patch repository
(use "hg strip -h" to show more help)
[255]
$ cd ..
Verify bundles don't get overwritten:
$ hg init doublebundle
$ cd doublebundle
$ touch a
$ hg commit -Aqm a
$ touch b
$ hg commit -Aqm b
$ hg strip -r 0
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
saved backup bundle to $TESTTMP/doublebundle/.hg/strip-backup/3903775176ed-e68910bd-backup.hg (glob)
$ ls .hg/strip-backup
3903775176ed-e68910bd-backup.hg
$ hg pull -q -r 3903775176ed .hg/strip-backup/3903775176ed-e68910bd-backup.hg
$ hg strip -r 0
saved backup bundle to $TESTTMP/doublebundle/.hg/strip-backup/3903775176ed-54390173-backup.hg (glob)
$ ls .hg/strip-backup
3903775176ed-54390173-backup.hg
3903775176ed-e68910bd-backup.hg
$ cd ..
Test that we only bundle the stripped changesets (issue4736)
------------------------------------------------------------
initialization (previous repo is empty anyway)
$ hg init issue4736
$ cd issue4736
$ echo a > a
$ hg add a
$ hg commit -m commitA
$ echo b > b
$ hg add b
$ hg commit -m commitB
$ echo c > c
$ hg add c
$ hg commit -m commitC
$ hg up 'desc(commitB)'
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo d > d
$ hg add d
$ hg commit -m commitD
created new head
$ hg up 'desc(commitC)'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc(commitD)'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m 'mergeCD'
$ hg log -G
@ changeset: 4:d8db9d137221
|\ tag: tip
| | parent: 2:5c51d8d6557d
| | parent: 3:6625a5168474
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: mergeCD
| |
| o changeset: 3:6625a5168474
| | parent: 1:eca11cf91c71
| | user: test
| | date: Thu Jan 01 00:00:00 1970 +0000
| | summary: commitD
| |
o | changeset: 2:5c51d8d6557d
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: commitC
|
o changeset: 1:eca11cf91c71
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: commitB
|
o changeset: 0:105141ef12d0
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commitA
Check bundle behavior:
$ hg bundle -r 'desc(mergeCD)' --base 'desc(commitC)' ../issue4736.hg
2 changesets found
$ hg log -r 'bundle()' -R ../issue4736.hg
changeset: 3:6625a5168474
parent: 1:eca11cf91c71
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commitD
changeset: 4:d8db9d137221
tag: tip
parent: 2:5c51d8d6557d
parent: 3:6625a5168474
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: mergeCD
check strip behavior
$ hg --config extensions.strip= strip 'desc(commitD)' --debug
resolving manifests
branchmerge: False, force: True, partial: False
ancestor: d8db9d137221+, local: d8db9d137221+, remote: eca11cf91c71
c: other deleted -> r
removing c
d: other deleted -> r
removing d
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
2 changesets found
list of changesets:
6625a516847449b6f0fa3737b9ba56e9f0f3032c
d8db9d1372214336d2b5570f20ee468d2c72fa8b
saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/6625a5168474-345bb43d-backup.hg (glob)
invalid branchheads cache (served): tip differs
truncating cache/rbc-revs-v1 to 24
$ hg log -G
o changeset: 2:5c51d8d6557d
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: commitC
|
@ changeset: 1:eca11cf91c71
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: commitB
|
o changeset: 0:105141ef12d0
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commitA
strip backup content
$ hg log -r 'bundle()' -R .hg/strip-backup/6625a5168474-*-backup.hg
changeset: 3:6625a5168474
parent: 1:eca11cf91c71
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commitD
changeset: 4:d8db9d137221
tag: tip
parent: 2:5c51d8d6557d
parent: 3:6625a5168474
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: mergeCD
Error during post-close callback of the strip transaction
(They should be gracefully handled and reported)
$ cat > ../crashstrip.py << EOF
> from mercurial import error
> def reposetup(ui, repo):
> class crashstriprepo(repo.__class__):
> def transaction(self, desc, *args, **kwargs):
> tr = super(crashstriprepo, self).transaction(self, desc, *args, **kwargs)
> if desc == 'strip':
> def crash(tra): raise error.Abort('boom')
> tr.addpostclose('crash', crash)
> return tr
> repo.__class__ = crashstriprepo
> EOF
$ hg strip tip --config extensions.crash=$TESTTMP/crashstrip.py
saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/5c51d8d6557d-70daef06-backup.hg (glob)
strip failed, full bundle stored in '$TESTTMP/issue4736/.hg/strip-backup/5c51d8d6557d-70daef06-backup.hg'
abort: boom
[255]