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Fix #299: add support for service readiness notification

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This patch adds service readiness notification to support daemons
employing systemd and s6 notification.  Complementing the native
Finit readiness support using PID files that exist already.

The two have slightly different ways of implementing readiness:

 - https://www.freedesktop.org/software/systemd/man/sd_notify.html
 - https://skarnet.org/software/s6/notifywhenup.html

Finit now provides both a NOTIFY_SOCKET environemnt variable, for
systemd, and a way to start s6 daemons with a descriptor argument.

For details on the syntax, see the `service` documentation.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg committed 2022-10-16 20:06:26 +02:00
1 parent 6e863a7872
commit 912a281ee2
10 files changed
+287 -19
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src/finit.h
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@@ -96,6 +96,7 @@
#define INIT_CMD_SVC_FIND 131
#define INIT_CMD_SVC_FIND_BYC 132
#define INIT_CMD_SIGNAL 133
#define INIT_CMD_NOTIFY_SOCKET 200 /* For readiness notification socket */
#define INIT_CMD_NACK 254
#define INIT_CMD_ACK 255