localrepo: stop doing special dirstate backup at transaction open
Since the dirstate writes are already managed by the transaction, we already do
a backup of the dirstate when necessary (and even trigger one to keep `hg
rollback` happy).
We needs some special code to deal with the initial empty checkout, but it is
not too complicated.
Managing variable filename (as dirstate-v2 uses) at the "journalfile" level, is
complex and fragile (which is consistent with the fact these files are not
journal…). If we no longer do it, our life is significantly simpler.
In some sense, we apply the xkcd-1134¹ solution to our savebackup/restorebackup
problem.
[1] https://xkcd.com/1134/
(the change to test-hardlink are expect as decreasing the number of duplicated
backup drive the hardlink count down)
$ hg init test
$ cd test
$ echo foo>foo
$ hg addremove
adding foo
$ hg commit -m "1"
$ hg verify -q
$ hg clone . ../branch
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd ../branch
$ hg co
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo bar>>foo
$ hg commit -m "2" -d '1 0'
$ cd ../test
$ hg pull ../branch
pulling from ../branch
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 84b9316f7b31
1 local changesets published
(run 'hg update' to get a working copy)
$ hg verify -q
$ hg co
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat foo
foo
bar
$ hg manifest --debug
6f4310b00b9a147241b071a60c28a650827fb03d 644 foo
update to rev 0 with a date
$ hg upd -d foo 0
abort: you can't specify a revision and a date
[10]
update by date
$ hg update -d '<1970-01-01 00:00:02 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '<1970-01-01 00:00:01 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '<1970-01-01 00:00:00 +0000'
found revision 0 from Thu Jan 01 00:00:00 1970 +0000
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '>1970-01-01 00:00:02 +0000'
abort: revision matching date not found
[10]
$ hg update -d '>1970-01-01 00:00:01 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '>1970-01-01 00:00:00 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
update to default destination (with empty revspec)
$ hg update -q null
$ hg update
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ hg update -q null
$ hg update -r ''
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ hg update -q null
$ hg update ''
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ cd ..
update with worker processes
#if no-windows
$ cat <<EOF > forceworker.py
> from mercurial import extensions, worker
> def nocost(orig, ui, costperop, nops, threadsafe=True):
> return worker._numworkers(ui) > 1
> def uisetup(ui):
> extensions.wrapfunction(worker, 'worthwhile', nocost)
> EOF
$ hg init worker
$ cd worker
$ cat <<EOF >> .hg/hgrc
> [extensions]
> forceworker = $TESTTMP/forceworker.py
> [worker]
> numcpus = 4
> EOF
$ for i in `"$PYTHON" $TESTDIR/seq.py 1 100`; do
> echo $i > $i
> done
$ hg ci -qAm 'add 100 files'
$ hg update null
0 files updated, 0 files merged, 100 files removed, 0 files unresolved
$ hg update -v | grep 100
getting 100
100 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg status
$ cd ..
#endif