sshfs: add -r and -M options

sys/man/4/sshfs

@@ -4,7 +4,7 @@ sshfs - secure file transfer protocol client
 .SH SYNOPSIS
 .B sshfs
 [
-.B -abdRUG
+.B -abdRUGM
 ]
 [
 .B -s
@@ -15,6 +15,10 @@ sshfs - secure file transfer protocol client
 .I mtpt
 ]
 [
+.B -r
+.I root
+]
+[
 .B -u
 .I uidfile
 ]
@@ -56,7 +60,10 @@ is specified,
 .I sshfs
 communicates with an SFTP server via stdin and stdout.
 .PP
-.I Sshfs
+Unless
+.B -M
+is specified,
+.I sshfs
 will mount itself under the mountpoint specified by
 .IR mtpt ,
 or under
@@ -73,6 +80,8 @@ and
 .B -b
 have the same function as they do with
 .IR mount (1).
+The default remote root is the user's home directory but can be changed with
+.BR -r .
 .PP
 If
 .B -s
@@ -108,7 +117,7 @@ If these files cannot be accessed for any reason, numeric IDs simply remain untr
 Further options:
 .TP
 -R
-Read-only access only.
+Read access only.
 .TP
 -d
 Enable debugging output.
@@ -125,6 +134,11 @@ In particular there is no guarantee that a failed
 did not change some of the fields.
 .PP
 The code is naive about links and assumes files with distinct names to be distinct, assigning them different QIDs.
+.PP
+File names with null bytes in them will confuse
+.I sshfs.
+.I Sshfs
+should probably escape them, as well as control characters that might confuse other software.
 .SH HISTORY
 .I
 Sshfs

sys/src/cmd/sshfs.c

@@ -7,6 +7,7 @@
 
 int readonly;
 int debug;
+char *root = ".";
 #define dprint(...) if(debug) fprint(2, __VA_ARGS__)
 #pragma	varargck	type	"Σ"	int
 
@@ -732,7 +733,8 @@ sshfsattach(Req *r)
 	if(r->ifcall.aname != nil && *r->ifcall.aname != 0)
 		sf->fn = strdup(r->ifcall.aname);
 	else
-		sf->fn = strdup(".");
+		sf->fn = strdup(root);
+	root = ".";
 	sf->qid = (Qid){qidcalc(sf->fn), 0, QTDIR};
 	r->ofcall.qid = sf->qid;
 	r->fid->qid = sf->qid;
@@ -1332,10 +1334,12 @@ threadmain(int argc, char **argv)
 	case 'a': mflag |= MAFTER; break;
 	case 'b': mflag |= MBEFORE; break;
 	case 'm': mtpt = EARGF(usage()); break;
+	case 'M': mtpt = nil; break;
 	case 'u': uidfile = EARGF(usage()); break;
 	case 'U': uidfile = nil; break;
 	case 'g': gidfile = EARGF(usage()); break;
 	case 'G': gidfile = nil; break;
+	case 'r': root = EARGF(usage()); break;
 	default: usage();
 	}ARGEND;