This adds 1k of weight to the resulting binary, which is reasonable
(it's less than 5% for the smaller non-static binary), but alleviates
legitimate user concern that the license requires being included when
Tini is redistributed.
Since we're ignoring SIGTTOU (for good reason), our log messages
could show in another program's output. To make the life of users
easier, let's clarify that the messages are owned by Tini.
In the rare scenario where Tini is not running as PID 1 and its
child (or something else) sets TOSTOP on the tty, then Tini would
hang when if it tries to write debug messages. This commit fixes
this problem by ignoring SIGTTOU.
In the also rare scenario where two Tini instances are running, the
tty-passing could end up being done improperly (if the parent Tini
instance passes the tty to the child before the grandparent Tini
instance passes it to the parent Tini instance), and result in the
parent Tini instance running in the foreground. This commit fixes
this problem by passing the tty in the child (which we can do
because we are ignoring SIGTTOU).
tini only kills the immediate child process. This means that if you
do, for example,
docker run krallin/ubuntu-tini sh -c 'sleep 10'
and ctrl-C it, nothing happens: SIGINT is sent to the 'sh' process,
but that shell won't react to it while it is waiting for the 'sleep'
to finish.
This change adds a -g option to put the child process of tini into a
new process group, and sends signals to that group, so that every
process in the group gets a signal. This corresponds more closely to
what happens when you do ctrl-C etc. in a terminal: The signal is sent
to the foreground process group.
So if you try the example above with a container image that passes -g
to tini, the SIGINT will be received by the 'sleep', and the container
promptly exits.
Thomas Orozco
David Wragg