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cons: add snapshotting, help.

--- a/cons.c

+++ b/cons.c

@@ -8,6 +8,8 @@

 typedef struct Cmd	Cmd;

+Cmd cmdtab[];

+

 struct Cmd {

 	char	*name;

 	char	*sub;

@@ -30,9 +32,20 @@

 }

 static void

-snapfs(int fd, char **, int)

+snapfs(int fd, char **ap, int na)

 {

-	fprint(fd, "snap\n");

+	char *e;

+	Tree t;

+

+	if((e = opensnap(&t, ap[0])) != nil){

+		fprint(fd, "snap: open %s: %s\n", ap[0], e);

+		return;

+	}

+	if((e = snapshot(&t, ap[na-1], 0)) != nil){

+		fprint(fd, "snap: save %s: %s\n", ap[na-1], e);

+		return;

+	}

+	fprint(fd, "snap %s: ok\n", ap[na-1]);

 }

 static void

@@ -44,10 +57,33 @@

 		fprint(fd, "broken fs\n");

 }

+static void

+help(int fd, char **ap, int na)

+{

+	Cmd *c;

+	int i;

+

+	for(c = cmdtab; c->name != nil; c++){

+		if(na == 0 || strcmp(ap[0], c->name) == 0){

+			if(c->sub == nil)

+				fprint(fd, "%s", c->name);

+			else

+				fprint(fd, "%s %s", c->name, c->sub);

+			for(i = 0; i < c->minarg; i++)

+				fprint(fd, " a%d", i);

+			for(i = c->minarg; i < c->maxarg; i++)

+				fprint(fd, " [a%d]", i);

+			fprint(fd, "\n");

+		}

+	}

+}

+

+

 Cmd cmdtab[] = {

 	{.name="sync",	.sub=nil,	.minarg=0, .maxarg=0, .fn=syncfs},

-	{.name="snap",	.sub=nil,	.minarg=1, .maxarg=1, .fn=snapfs},

+	{.name="snap",	.sub=nil,	.minarg=1, .maxarg=2, .fn=snapfs},

 	{.name="check",	.sub=nil,	.minarg=1, .maxarg=1, .fn=fsckfs},

+	{.name="help",	.sub=nil,	.minarg=0, .maxarg=1, .fn=help},

 	/* debugging */

 	{.name="show",	.sub="cache",	.minarg=0, .maxarg=0, .fn=showcache},