commandserver: add new forking server implemented without using SocketServer
SocketServer.ForkingMixIn of Python 2.x has a couple of issues, such as:
- race condition that leads to 100% CPU usage (Python 2.6)
https://bugs.python.org/
issue21491
- can't wait for children belonging to different process groups (Python 2.6)
- leaves at least one zombie process (Python 2.6, 2.7)
https://bugs.python.org/
issue11109
The first two are critical because we do setpgid(0, 0) in child process to
isolate terminal signals. The last one isn't, but ForkingMixIn seems to be
doing silly. So there are two choices:
a) backport and maintain SocketServer until we can drop support for Python 2.x
b) replace SocketServer by simpler one and eliminate glue codes
I chose (b) because it's great time for getting rid of utterly complicated
SocketServer stuff, and preparing for future move towards prefork service.
New unixforkingservice is implemented loosely based on chg
531f8ef64be6. It
is monolithic but much simpler than SocketServer. unixservicehandler provides
customizing points for chg, and it will be shared with future prefork service.
Old unixservice class is still used by chgserver. It will be removed later.
Thanks to Jun Wu for investigating these issues.
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: '{desc}' bookmarks: {bookmarks}\n"
> EOF
Create a repo with several bookmarks
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am A
adding a
$ echo b > b
$ hg ci -Am B
adding b
$ hg book 'X'
$ hg book 'Y'
$ echo c > c
$ hg ci -Am C
adding c
$ hg book 'Z'
$ hg up -q 0
$ echo d > d
$ hg ci -Am D
adding d
created new head
$ hg book W
$ hg tglog
@ 3: 'D' bookmarks: W
|
| o 2: 'C' bookmarks: Y Z
| |
| o 1: 'B' bookmarks: X
|/
o 0: 'A' bookmarks:
Move only rebased bookmarks
$ cd ..
$ hg clone -q a a1
$ cd a1
$ hg up -q Z
Test deleting divergent bookmarks from dest (issue3685)
$ hg book -r 3 Z@diverge
... and also test that bookmarks not on dest or not being moved aren't deleted
$ hg book -r 3 X@diverge
$ hg book -r 0 Y@diverge
$ hg tglog
o 3: 'D' bookmarks: W X@diverge Z@diverge
|
| @ 2: 'C' bookmarks: Y Z
| |
| o 1: 'B' bookmarks: X
|/
o 0: 'A' bookmarks: Y@diverge
$ hg rebase -s Y -d 3
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/49cb3485fa0c-126f3e97-backup.hg (glob)
$ hg tglog
@ 3: 'C' bookmarks: Y Z
|
o 2: 'D' bookmarks: W X@diverge
|
| o 1: 'B' bookmarks: X
|/
o 0: 'A' bookmarks: Y@diverge
Do not try to keep active but deleted divergent bookmark
$ cd ..
$ hg clone -q a a4
$ cd a4
$ hg up -q 2
$ hg book W@diverge
$ hg rebase -s W -d .
rebasing 3:41acb9dca9eb "D" (tip W)
saved backup bundle to $TESTTMP/a4/.hg/strip-backup/41acb9dca9eb-b35a6a63-backup.hg (glob)
$ hg bookmarks
W 3:0d3554f74897
X 1:6c81ed0049f8
Y 2:49cb3485fa0c
Z 2:49cb3485fa0c
Keep bookmarks to the correct rebased changeset
$ cd ..
$ hg clone -q a a2
$ cd a2
$ hg up -q Z
$ hg rebase -s 1 -d 3
rebasing 1:6c81ed0049f8 "B" (X)
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a2/.hg/strip-backup/6c81ed0049f8-a687065f-backup.hg (glob)
$ hg tglog
@ 3: 'C' bookmarks: Y Z
|
o 2: 'B' bookmarks: X
|
o 1: 'D' bookmarks: W
|
o 0: 'A' bookmarks:
Keep active bookmark on the correct changeset
$ cd ..
$ hg clone -q a a3
$ cd a3
$ hg up -q X
$ hg rebase -d W
rebasing 1:6c81ed0049f8 "B" (X)
rebasing 2:49cb3485fa0c "C" (Y Z)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/6c81ed0049f8-a687065f-backup.hg (glob)
$ hg tglog
o 3: 'C' bookmarks: Y Z
|
@ 2: 'B' bookmarks: X
|
o 1: 'D' bookmarks: W
|
o 0: 'A' bookmarks:
$ hg bookmarks
W 1:41acb9dca9eb
* X 2:e926fccfa8ec
Y 3:3d5fa227f4b5
Z 3:3d5fa227f4b5
rebase --continue with bookmarks present (issue3802)
$ hg up 2
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(leaving bookmark X)
$ echo 'C' > c
$ hg add c
$ hg ci -m 'other C'
created new head
$ hg up 3
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg rebase --dest 4
rebasing 3:3d5fa227f4b5 "C" (Y Z)
merging c
warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)
[1]
$ echo 'c' > c
$ hg resolve --mark c
(no more unresolved files)
continue: hg rebase --continue
$ hg rebase --continue
rebasing 3:3d5fa227f4b5 "C" (Y Z)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/3d5fa227f4b5-c6ea2371-backup.hg (glob)
$ hg tglog
@ 4: 'C' bookmarks: Y Z
|
o 3: 'other C' bookmarks:
|
o 2: 'B' bookmarks: X
|
o 1: 'D' bookmarks: W
|
o 0: 'A' bookmarks:
ensure that bookmarks given the names of revset functions can be used
as --rev arguments (issue3950)
$ hg update -q 3
$ echo bimble > bimble
$ hg add bimble
$ hg commit -q -m 'bisect'
$ echo e >> bimble
$ hg ci -m bisect2
$ echo e >> bimble
$ hg ci -m bisect3
$ hg book bisect
$ hg update -q Y
$ hg rebase -r '"bisect"^^::"bisect"^' -r bisect -d Z
rebasing 5:345c90f326a4 "bisect"
rebasing 6:f677a2907404 "bisect2"
rebasing 7:325c16001345 "bisect3" (tip bisect)
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/345c90f326a4-b4840586-backup.hg (glob)