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cwfs: initialize /env/timezone on boot so dumps are in localtime

when /env/timezone file is missing (boot case), copy /adm/timezone/local
to /env/timezone so localtime() can correct timezone offset.

--- a/sys/src/cmd/cwfs/con.c

+++ b/sys/src/cmd/cwfs/con.c

@@ -7,6 +7,7 @@

 static	void	consserve1(void *);

 static	void	installcmds(void);

+static	void	tzinit(char*);

 void

 consserve(void)

@@ -599,6 +600,7 @@

 static void

 cmd_version(int, char *[])

 {

+	tzinit("/adm/timezone/local");

 	print("%d-bit %s as of %T\n", sizeof(Off)*8 - 1, service, fs_mktime);

 	print("\tlast boot %T\n", boottime);

 }

@@ -678,6 +680,28 @@

 		return;

 	}

 }

+

+static void

+tzinit(char *file)

+{

+	char buf[1024];

+	Off o;

+	int f, n;

+

+	f = create("#e/timezone", OEXCL|OWRITE, 0666);

+	if(f < 0)

+		return;

+	if(walkto(file) || con_open(FID2, 0)) {

+		print("tzinit: cannot access %s\n", file);

+		close(f);

+		remove("#e/timezone");

+		return;

+	}

+	for(o = 0; (n = con_read(FID2, buf, o, sizeof(buf))) > 0; o += n)

+		write(f, buf, n);

+	close(f);

+}

+

 static void

 cmd_time(int argc, char *argv[])

-- 

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