Dump-like file system backup for Unix, built on Venti.

src/cmd/vbackup/diskftp.c

@@ -0,0 +1,134 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <sunrpc.h>
+#include <nfs3.h>
+#include <diskfs.h>
+
+int debug;
+
+void
+usage(void)
+{
+	fprint(2, "usage: fsview fspartition cmd\n");
+	fprint(2, "cmd is:\n");
+	fprint(2, "\tcat file\n");
+	fprint(2, "\tls dir\n");
+	fprint(2, "\tstat file\n");
+	exits("usage");
+}
+
+void
+printattr(Nfs3Attr *attr)
+{
+	Fmt fmt;
+	char buf[256];
+
+	fmtfdinit(&fmt, 1, buf, sizeof buf);
+	nfs3attrprint(&fmt, attr);
+	fmtfdflush(&fmt);
+	print("\n");
+}
+
+char buf[8192];
+
+void
+x(int ok)
+{
+	if(ok != Nfs3Ok){
+		nfs3errstr(ok);
+		sysfatal("%r");
+	}
+}
+
+void
+threadmain(int argc, char **argv)
+{
+	char *p, *q;
+	u32int n;
+	Disk *disk;
+	Fsys *fsys;
+	Nfs3Handle h;
+	SunAuthUnix au;
+	Nfs3Attr attr;
+	u64int offset;
+	u1int eof;
+	uchar *data;
+	char *link;
+
+	ARGBEGIN{
+	case 'd':
+		debug = 1;
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if(argc != 3)
+		usage();
+
+	if((disk = diskopenfile(argv[0])) == nil)
+		sysfatal("diskopen: %r");
+	if((disk = diskcache(disk, 16384, 16)) == nil)
+		sysfatal("diskcache: %r");
+	if((fsys = fsysopen(disk)) == nil)
+		sysfatal("ffsopen: %r");
+
+	allowall = 1;
+	memset(&au, 0, sizeof au);
+
+	/* walk */
+	if(debug) fprint(2, "get root...");
+	x(fsysroot(fsys, &h));
+	p = argv[2];
+	while(*p){
+		while(*p == '/')
+			p++;
+		if(*p == 0)
+			break;
+		q = strchr(p, '/');
+		if(q){
+			*q = 0;
+			q++;
+		}else
+			q = "";
+		if(debug) fprint(2, "walk %s...", p);
+		x(fsyslookup(fsys, &au, &h, p, &h));
+		p = q;
+	}
+
+	if(debug) fprint(2, "getattr...");
+	x(fsysgetattr(fsys, &au, &h, &attr));
+	printattr(&attr);
+
+	/* do the op */
+	if(strcmp(argv[1], "cat") == 0){
+		switch(attr.type){
+		case Nfs3FileReg:
+			offset = 0;
+			for(;;){
+				x(fsysreadfile(fsys, &au, &h, sizeof buf, offset, &data, &n, &eof));
+				if(n){
+					write(1, data, n);
+					free(data);
+					offset += n;
+				}
+				if(eof)
+					break;
+			}
+			break;
+		case Nfs3FileSymlink:
+			x(fsysreadlink(fsys, &au, &h, &link));
+			print("%s\n", link);
+			break;
+		default:
+			print("cannot cat: not file, not link\n");
+			break;
+		}
+	}else if(strcmp(argv[1], "ls") == 0){
+		/* not implemented */
+	}else if(strcmp(argv[1], "stat") == 0){
+		/* already done */
+	}
+	threadexitsall(nil);
+}