branchcache: skip entries that are topological heads in the on disk file
In the majority of cases, topological heads are also branch heads. We have
efficient way to get the topological heads and efficient way to retrieve
their branch information. So there is little value in putting them in the branch
cache file explicitly. On the contrary, writing them explicitly tend to create
very large cache file that are inefficient to read and update.
So the branch cache v3 format is no longer including them. This changeset focus
on the format aspect and have no focus on the performance aspect. We will cover
that later.
#require no-windows
ATTENTION: logtoprocess runs commands asynchronously. Be sure to append "| cat"
to hg commands, to wait for the output, if you want to test its output.
Otherwise the test will be flaky.
Test if logtoprocess correctly captures command-related log calls.
$ hg init
$ cat > $TESTTMP/foocommand.py << EOF
> from mercurial import registrar
> cmdtable = {}
> command = registrar.command(cmdtable)
> configtable = {}
> configitem = registrar.configitem(configtable)
> configitem(b'logtoprocess', b'foo',
> default=None,
> )
> @command(b'foobar', [])
> def foo(ui, repo):
> ui.log(b'foo', b'a message: %s\n', b'spam')
> EOF
$ cp $HGRCPATH $HGRCPATH.bak
$ cat >> $HGRCPATH << EOF
> [extensions]
> logtoprocess=
> foocommand=$TESTTMP/foocommand.py
> [logtoprocess]
> command=(echo 'logtoprocess command output:';
> echo "\$EVENT";
> echo "\$MSG1") > $TESTTMP/command.log
> commandfinish=(echo 'logtoprocess commandfinish output:';
> echo "\$EVENT";
> echo "\$MSG1";
> echo "canonical: \$OPT_CANONICAL_COMMAND") > $TESTTMP/commandfinish.log
> foo=(echo 'logtoprocess foo output:';
> echo "\$EVENT";
> echo "\$MSG1") > $TESTTMP/foo.log
> EOF
Running a command triggers both a ui.log('command') and a
ui.log('commandfinish') call. The foo command also uses ui.log.
Use sort to avoid ordering issues between the various processes we spawn:
$ hg fooba
$ sleep 1
$ cat $TESTTMP/command.log | sort
command
fooba
logtoprocess command output:
#if no-chg
$ cat $TESTTMP/commandfinish.log | sort
canonical: foobar
commandfinish
fooba exited 0 after * seconds (glob)
logtoprocess commandfinish output:
$ cat $TESTTMP/foo.log | sort
a message: spam
foo
logtoprocess foo output:
#endif
Confirm that logging blocked time catches stdio properly:
$ cp $HGRCPATH.bak $HGRCPATH
$ cat >> $HGRCPATH << EOF
> [extensions]
> logtoprocess=
> pager=
> [logtoprocess]
> uiblocked=echo "\$EVENT stdio \$OPT_STDIO_BLOCKED ms command \$OPT_COMMAND_DURATION ms" > $TESTTMP/uiblocked.log
> [ui]
> logblockedtimes=True
> EOF
$ hg log
$ sleep 1
$ cat $TESTTMP/uiblocked.log
uiblocked stdio [0-9]+.[0-9]* ms command [0-9]+.[0-9]* ms (re)
Try to confirm that pager wait on logtoprocess:
Add a script that waits on a file to appear. If the script is awaited by hg,
the script will die after the timeout before we could touch the file and the
resulting file will not exist. If not, we will touch the file and see it.
$ cat >> fakepager.py <<EOF
> import sys
> printed = False
> for line in sys.stdin:
> sys.stdout.write(line)
> printed = True
> if not printed:
> sys.stdout.write('paged empty output!\n')
> EOF
$ cat > $TESTTMP/wait-output.sh << EOF
> #!/bin/sh
> set -eu
> "$RUNTESTDIR/testlib/wait-on-file" 10 "$TESTTMP/wait-for-touched"
> touch "$TESTTMP/touched"
> EOF
$ chmod +x $TESTTMP/wait-output.sh
$ cat >> $HGRCPATH << EOF
> [extensions]
> logtoprocess=
> pager=
> [pager]
> pager = "$PYTHON" $TESTTMP/fakepager.py
> [logtoprocess]
> commandfinish=$TESTTMP/wait-output.sh
> EOF
$ hg version -q --pager=always
Mercurial Distributed SCM (version *) (glob)
$ touch $TESTTMP/wait-for-touched
$ "$RUNTESTDIR/testlib/wait-on-file" 5 "$TESTTMP/touched"
$ test -f $TESTTMP/touched && echo "SUCCESS Pager is not waiting on ltp" || echo "FAIL Pager is waiting on ltp"
SUCCESS Pager is not waiting on ltp