Check for save file's availability in init.d/swclock

[meoovv]

closes #989

rc-service swclock status
 * status: stopped
alpine:~# rc-service swclock start
 * Caching service dependencies ... [ ok ]
 * Setting the local clock based on last shutdown time ...
 * swclock: `/var/lib/misc/openrc-shutdowntime': No such file or directory [ ok ]
alpine:~# rc-service swclock stop
 * Saving the shutdown time ...
 * /var/lib/misc/openrc-shutdowntime: creating [ ok ]

service declares use bootmisc to ensure that /var/lib/misc exists. since bootmisc depends on localmount, the case described in the mentioned issue should no longer be possible.
if save file does not exist, checkpath is called to create it. if its parent directory is missing, service reports “no such file” error.

[navi-desu]

this seems wrong. it's a fallback for when the swclock file doesn't exist, thus comparing against a known-existent file

[meoovv]

but whats the point? it makes script succeed everytime it starts

[navi-desu]

the point is to set a system time that is closer to now than january 1st, 1970

aka it's a fallback, for a reason

[meoovv]

would it be appropriate to mention this in einfo?

[navi-desu]

swclock will print out an error for the first failed try already

we could additionally add ewarn "Falling back to @BINDIR@/openrc-run as clock reference" or something, i have no issue with that

[meoovv]

swclock will print out an error for the first failed try already

seems like it wont? service just starts successfully for me when fallback file exists.

[navi-desu]

the service will start successfully, yes, and this is required so that first-boot on sw clock doesn't always trigger a failure

it will print out a message with eerrorx, that can be seen either on the console, or by setting rc_logger in /etc/rc.conf

[navi-desu]

we could move this to /var/lib/rc which we're already using for the deptree cache

also please rebase your commits, this doesn't have to be more than one commit, much less have a revert commit on it

[thesamesam]

This introduces a typo:

Suggested change

	swclock --warn "@SBINDIR/openrc-run"
	swclock --warn "@SBINDIR@/openrc-run"

[thesamesam]

Please use a real email address as git author, not meow@localhost.

[meoovv]

service should not fail if the second swclock call fails, right?