debugbuilddag: use memctx for speed
This drops the options to run arbitrary shell commands within
commits and the option to create a file that gets appended to
in every revision. It now supports to not write file data at
all, which is very fast for generating a pure 00changelog.i
(useful for discovery tests, for instance).
Timings for 1000 linear nodes:
* Old `hg debugbuilddag -o '+1000'` took 4.5 secs.
* New `hg debugbuilddag -o '+1000'` takes 2 secs.
* New `hg debugbuilddag '+1000'` takes 0.8 secs.
(The last one creates only 00changelog.i).
$ "$TESTDIR/hghave" inotify || exit 80
$ hg init
$ touch a b
$ hg add a b
$ rm b
status without inotify
$ hg st
A a
! b
$ echo "[extensions]" >> $HGRCPATH
$ echo "inotify=" >> $HGRCPATH
inserve
$ hg inserve -d --pid-file=hg.pid 2>&1
$ cat hg.pid >> "$DAEMON_PIDS"
status
$ hg st
A a
! b
? hg.pid
$ sleep 1
Are we able to kill the service? if not, the service died on some error
$ kill `cat hg.pid`