procutil: add a option to not fully detach background process
When writing test, it is useful to make code pretending to spawn a fully
detached process while still actually waiting for it to finish. We add the
option to `procutil.runbgcommand`, to do so. We will use this in remote-filelog
tests.
Differential Revision: https://phab.mercurial-scm.org/D7584
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
$ test -d copy
[1]
$ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ killdaemons.py