add initial lemmyfs

lemmyfs.c

@@ -0,0 +1,245 @@
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <thread.h>
+#include <9p.h>
+#include <json.h>
+
+typedef struct LemmyFile LemmyFile;
+
+struct LemmyFile 
+{
+	char *name;
+	char * (*fsread)(Req*);
+	int mode;
+};
+
+void fsopen(Req *r);
+void fswrite(Req *r);
+void fsread(Req *r);
+void fsend(Srv *s);
+char* getcommunityfunc(Req*);
+char* gettimefunc(Req*);
+
+LemmyFile files[] = 
+{
+	{"getcommunity", getcommunityfunc, 0444},
+	{"gettime", gettimefunc, 0444},
+};
+
+Srv s = 
+{
+	.open = fsopen,
+	.read = fsread,
+	.write = fswrite,
+	.end = fsend,
+};
+
+File *root;
+File *lemmydir;
+char *endpoint;
+
+char*
+webfs(char *cmd, char *post)
+{
+	int conn, ctlfd, fd, hd, n;
+	char buf[256], *mtpt;
+
+	mtpt = "/mnt/web";
+
+	snprint(buf, sizeof buf, "%s/clone", mtpt);
+	if((ctlfd = open(buf, ORDWR)) < 0)
+	{
+		sysfatal("couldn't open %s: %r", buf);
+	}
+
+	if((n = read(ctlfd, buf, sizeof buf)) < 0)
+	{
+		sysfatal("reading i32: %r");
+	}
+
+	if(n == 0)
+	{
+		sysfatal("short read on i32");
+	}
+
+	buf[n] = '\0';
+	conn = atoi(buf);
+
+	if(fprint(ctlfd, "url %s%s", endpoint, cmd) <= 0)
+	{
+		sysfatal("get ctl write: %r");
+	}
+
+	if(post)
+	{
+		snprint(buf, sizeof buf, "%s/%d/postbody", mtpt, conn);
+		if((fd = open(buf, OWRITE)) < 0)
+		{
+			sysfatal("open %s: %r", buf);
+		}
+
+		if(write(fd, post, strlen(post)) < 0)
+		{
+			sysfatal("post write failed: %r");
+		}
+		close(fd);
+	}
+
+	snprint(buf, sizeof buf, "%s/%d/body", mtpt, conn);
+	if((fd = open(buf, OREAD)) < 0)
+	{
+		sysfatal("open %s: %r", buf);
+	}
+
+	snprint(buf, sizeof buf, "%s/%d/contentlength", mtpt, conn);
+	if ((hd = open(buf, OREAD)) < 0)
+	{
+		sysfatal("open header %s %r", buf);
+	}
+
+	if((n = read(hd, buf, sizeof buf)) < 0)
+	{
+		sysfatal("reading i32: %r");
+	}
+
+	if(n == 0)
+	{
+		sysfatal("short read on i32");
+	}
+
+	buf[n] = '\0';
+	int s = atoi(buf);
+	close(hd);
+
+	char* json_string = (char*)calloc(s, sizeof(char));
+	readn(fd, json_string, s*sizeof(char));
+	return json_string;
+
+	/*
+	JSON* j = jsonparse(json_string);
+	if (j == nil)
+	{
+		sysfatal("error jsonparse %s: %r", json_string);
+	}		
+	else
+	{
+		print("%J\n", j);
+		jsonfree(j);
+	}
+	*/
+}
+
+void
+fsend(Srv *)
+{
+	postnote(PNGROUP, getpid(), "shutdown");
+	threadexitsall(nil);
+}
+
+void
+fsopen(Req *r)
+{
+	respond(r, nil);
+}
+
+void
+fsread(Req *r)
+{
+	LemmyFile *f;
+	r->ofcall.count = 0;
+	f = r->fid->file->aux;
+	respond(r, f->fsread(r));
+}
+
+void
+fswrite(Req *r)
+{
+	/* not implemented yet */
+	respond(r, nil);
+}
+
+void
+fsinit(void)
+{
+	char *user;
+	int i;
+
+	user = getuser();
+	s.tree = alloctree(user, user, 0555, nil);
+	if (s.tree == nil)
+	{
+		sysfatal("alloctree failed");
+	}
+	root = s.tree->root;
+
+	if ((lemmydir = createfile(root, "lemmy", user, DMDIR|0555, nil)) == nil)
+	{
+		sysfatal("lemmy root file failed");
+	}
+
+	for (i = 0; i < nelem(files); i++)
+	{
+		if (createfile(lemmydir, files[i].name, user, files[i].mode, files + i) == nil)
+		{
+			sysfatal("%s file failed", files[i].name);
+		}
+		else
+		{
+			print("created %s\n", files[i].name);
+		}
+	}
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s [-n filename] [-m mountpoint] [-e lemmy endpoint]\n", argv0);
+	exits("usage");
+}
+
+void
+threadmain(int argc, char **argv)
+{
+	char *srvname = "lemmyfs";
+	char *mntpt = "/n";
+
+	ARGBEGIN {
+		case 'n':
+			srvname = EARGF(usage());
+			break;
+		case 'm':
+			mntpt = EARGF(usage());
+			break;
+		case 'e':
+			endpoint = EARGF(usage());
+			break;
+		default:
+			usage();
+	} ARGEND
+
+	JSONfmtinstall();
+
+	fsinit();
+	threadpostmountsrv(&s, srvname, mntpt, MBEFORE);
+	threadexits(nil);
+}
+
+char*
+getcommunityfunc(Req *r)
+{
+	char *response;
+	response = webfs("/community/list", nil);
+	readstr(r, response);
+	free(response);
+	return nil;
+}
+
+char*
+gettimefunc(Req *r)
+{
+	char buf[128];
+	snprint(buf, sizeof buf, "%ld\n", time(0));
+	readstr(r, buf);
+	return nil;
+}

mkfile

@@ -0,0 +1,11 @@
+</$objtype/mkfile
+
+TARG=lemmyfs
+
+OFILES=\
+	lemmyfs.$O\
+
+HFILES=\
+
+BIN=/usr/$user/bin/$objtype
+</sys/src/cmd/mkone