acme: add -m option and avoid looking in the mirror
diff --git a/src/cmd/acme/acme.c b/src/cmd/acme/acme.c
index 87673cd..07ce503 100644
--- a/src/cmd/acme/acme.c
+++ b/src/cmd/acme/acme.c
@@ -28,6 +28,7 @@
int snarffd = -1;
int mainpid;
int swapscrollbuttons = FALSE;
+char *mtpt;
enum{
NSnarf = 1000 /* less than 1024, I/O buffer size */
@@ -106,6 +107,11 @@
if(loadfile == nil)
goto Usage;
break;
+ case 'm':
+ mtpt = ARGF();
+ if(mtpt == nil)
+ goto Usage;
+ break;
case 'r':
swapscrollbuttons = TRUE;
break;
@@ -1056,3 +1062,13 @@
free(r);
free(s);
}
+
+int
+ismtpt(char *file)
+{
+ int n;
+
+ /* This is not foolproof, but it will stop a lot of them. */
+ n = strlen(mtpt);
+ return strncmp(file, mtpt, n) == 0 && ((n > 0 && mtpt[n-1] == '/') || file[n] == '/' || file[n] == 0);
+}
diff --git a/src/cmd/acme/dat.h b/src/cmd/acme/dat.h
index a0d5cef..93af258 100644
--- a/src/cmd/acme/dat.h
+++ b/src/cmd/acme/dat.h
@@ -542,6 +542,7 @@
int messagesize; /* negotiated in 9P version setup */
int globalautoindent;
int dodollarsigns;
+char* mtpt;
enum
{
diff --git a/src/cmd/acme/fns.h b/src/cmd/acme/fns.h
index 34d561c..c714175 100644
--- a/src/cmd/acme/fns.h
+++ b/src/cmd/acme/fns.h
@@ -102,3 +102,5 @@
#define runemalloc(a) (Rune*)emalloc((a)*sizeof(Rune))
#define runerealloc(a, b) (Rune*)erealloc((a), (b)*sizeof(Rune))
#define runemove(a, b, c) memmove((a), (b), (c)*sizeof(Rune))
+
+int ismtpt(char*);
diff --git a/src/cmd/acme/fsys.c b/src/cmd/acme/fsys.c
index 9a7dbd1..b5ed8d6 100644
--- a/src/cmd/acme/fsys.c
+++ b/src/cmd/acme/fsys.c
@@ -121,7 +121,7 @@
initfcall();
if(pipe(p) < 0)
error("can't create pipe");
- if(post9pservice(p[0], "acme") < 0)
+ if(post9pservice(p[0], "acme", mtpt) < 0)
error("can't post service");
sfd = p[1];
fmtinstall('F', fcallfmt);
diff --git a/src/cmd/acme/look.c b/src/cmd/acme/look.c
index 66c6c66..2ca2061 100644
--- a/src/cmd/acme/look.c
+++ b/src/cmd/acme/look.c
@@ -620,7 +620,7 @@
if(w != nil)
goto Isfile;
/* if it's the name of a file, it's a file */
- if(access(e->bname, 0) < 0){
+ if(ismtpt(e->bname) || access(e->bname, 0) < 0){
free(e->bname);
e->bname = nil;
goto Isntfile;
diff --git a/src/cmd/acme/text.c b/src/cmd/acme/text.c
index ddb3527..f972b6a 100644
--- a/src/cmd/acme/text.c
+++ b/src/cmd/acme/text.c
@@ -200,6 +200,10 @@
warning(nil, "empty directory name");
return 0;
}
+ if(ismtpt(file)){
+ warning(nil, "will not open self mount point %s\n", file);
+ return 0;
+ }
fd = open(file, OREAD);
if(fd < 0){
warning(nil, "can't open %s: %r\n", file);
