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LISTEN_FDNAMES is optional, the docs for sd_listen_fds() says:
This information is read from the $LISTEN_FDNAMES variable, which
**may** contain a colon-separated list of names.
emphasis mine (indeed, the cited coreos code also suggests it is optional).
This actually results in bug, since the default
/contrib/systemd/system/podman.socket file doesn't set a
FileDescriptorName=. podman when run with this systemd configuration
*always* starts in unix socket mode since SocketActivated() will return
false because the name is missing.
The bug is a race with a very small window: between when podman does the
unlink() and when it re-binds the socket later in the code, requests made
during this time will fail since nothing is listening. There's another
small race when the service stops and systemd realizes it and starts
listening again.
However, small this window we managed to hit it :).
Let's fix this by ignoring LISTEN_FDNAMES. Since the code in
cmd/podman/system/service_abi.go:restService() ignores this value anyway
when setting up the socket activated stuff, there's no real loss here.
Signed-off-by: Tycho Andersen <tycho@tycho.pizza>
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* Fix support for socket activation, on remote and service
$ systemd-socket-activate -l 8083 --fdname=podman bin/podman system service --log-level=debug --time=30
$ bin/podman-remote --remote=tcp://[::]:8083 image ls
Or, use the podman.{socket,service} unit files
$ bin/podman-remote --remote=unix:///run/podman/podman.sock image ls
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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On panic from handler: log warning and stack trace, report
InternalServerError to client
When using `podman system service` make determining the listening endpoint deterministic.
// When determining _*THE*_ listening endpoint --
// 1) User input wins always
// 2) systemd socket activation
// 3) rootless honors XDG_RUNTIME_DIR
// 4) if varlink -- adapter.DefaultVarlinkAddress
// 5) lastly adapter.DefaultAPIAddress
Fixes #5150
Fixes #5151
Signed-off-by: Jhon Honce <jhonce@redhat.com>
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