The CRI requires us to prepend (timestamp, stream) to every line of the
output, and it's quite likely (especially in the !terminal case) that we
will read more than one line of output in the read loop.
So, we need to write out each line separately with the prepended
timestamps. Doing this the simple way (the final part of the buffer is
written partially if it doesn't end in a newline) makes the code much
simpler, with the downside that if we ever switch to multiple streams
for output we'll have to rewrite parts of this.
In addition, drop the debugging output of cri-o for each chunk read so
we stop spamming stderr. We can do this now because 8a928d06e7
("oci: make ExecSync with ExitCode != 0 act properly") actually fixed
how ExecSync was being handled (especially in regards to this patch).
Fixes: 1dc4c87c93 ("conmon: add timestamps to logs")
Signed-off-by: Aleksa Sarai <asarai@suse.de>
CRI requires us to timestamp our logs line-by-line by specifying whether
the line came from std{out,err} and the time at which the log was
recieved. This is a preliminary implementation of said behaviour
(without explicit newline handling at the moment).
Signed-off-by: Mrunal Patel <mpatel@redhat.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
While pipes have their downsides, it turns out that socketpair(2) will
break any program that tries to open /dev/std{out,err} for writing
(because they're symlinked to /proc/1/fd/{1,2} which will cause lots of
fun issues with sockets).
Signed-off-by: Mrunal Patel <mpatel@redhat.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
This adds a very simple implementation of logging within conmon, where
every buffer read from the masterfd of the container is also written to
the log file (with errors during writing to the log file ignored).
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Some OCI container runtimes (in particular the hypervisor
based ones) will typically create a shim process between
the hypervisor and the runtime caller, in order to not
rely on the hypervisor process for e.g. forwarding the
output streams or getting a command exit code.
With these runtimes we need to monitor a different process
than the runtime one when executing a command inside a
running container. The natural place to do so is conmon
and thus we add a new option to conmon for calling the
runtime exec command, monitor the PID and then return the
running command exit code through the sync pipe to the
parent.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
waitpid fills its second argument with a value that
contains the process exit code in the 8 least significant
bits. Instead of returning the complete value and then
convert it from ocid, return the exit status directly
by using WEXITSTATUS from conmon.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
We need to be able pass both the bundle path and the pid file
paths to conmon from ocid.
The former is mandatory when creating an OCI container:
https://github.com/opencontainers/runtime-spec/blob/master/runtime.md#create
And it makes sense to provide a full path for the latter as the
current hardcoded relative path may lead to errors if e.g. the
runtime chdir() before creating the PID file.
In both cases we try to create default reasonable values when
they are left empty by the caller.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
conmon uses getopt() even if it's a glib based application,
and therefore could use the much more modern and flexible
GOptionContext mechanism. Fixes#89
Signed-off-by: Alvaro Lopez Ortega <alvaro@gnu.org>
