This allows for higher-level orchestrators to be able to have access to
the master pty file descriptor without keeping the runC process running.
This is key to having (detach && createTTY) with a _real_ pty created
inside the container, which is then sent to a higher level orchestrator
over an AF_UNIX socket.
This patch is part of the console rewrite patchset.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Since the gid=X and mode=Y flags can be set inside config.json as mount
options, don't override them with our own defaults. This avoids
/dev/pts/* not being owned by tty in a regular container, as well as all
of the issues with us implementing grantpt(3) manually. This is the
least opinionated approach to take.
This patch is part of the console rewrite patchset.
Reported-by: Mrunal Patel <mrunalp@gmail.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
This implements {createTTY, detach} and all of the combinations and
negations of the two that were previously implemented. There are some
valid questions about out-of-OCI-scope topics like !createTTY and how
things should be handled (why do we dup the current stdio to the
process, and how is that not a security issue). However, these will be
dealt with in a separate patchset.
In order to allow for late console setup, split setupRootfs into the
"preparation" section where all of the mounts are created and the
"finalize" section where we pivot_root and set things as ro. In between
the two we can set up all of the console mountpoints and symlinks we
need.
We use two-stage synchronisation to ensures that when the syscalls are
reordered in a suboptimal way, an out-of-place read() on the parentPipe
will not gobble the ancilliary information.
This patch is part of the console rewrite patchset.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
The default terminal setting for a new pty on Linux (unix98) has +ONLCR,
resulting in '\n' writes by a container process to be converted to
'\r\n' reads by the managing process. This is quite unexpected, and
causes multiple issues with things like bats testing. To fix it, make
the terminal sane after opening it by setting -ONLCR.
This patch might need to be rewritten after the console rewrite patchset
is merged.
Signed-off-by: Aleksa Sarai <asarai@suse.de>
I use the same tool (https://github.com/client9/misspell)
as Daniel used a few days ago, don't why he missed these
typos at that time.
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Christy Perez
Michael Crosby
Aleksa Sarai
Mrunal Patel
Qiang Huang
Daniel Dao
Antonio Murdaca