v0.1; add -v flag to print version info and /version file for client to know the version as well

README.md

@@ -8,7 +8,7 @@ The client is a specialized [uxn](https://wiki.xxiivv.com/site/uxn.html) ROM tha
 
 This is the working structure of the 9p filesystem:
 
-* `/ctl`: Read/write control file for inputing system commands. Reading the file shows the status of the last input command: 1 for success, 0 for failure; `logout` is a special case, and the status code will be -1 if it was succesful. the following are valid command syntax:
+  * `/ctl`: Read/write control file for inputing system commands. Reading the file shows the status of the last input command: 1 for success, 0 for failure; `logout` is a special case, and the status code will be -1 if it was succesful. the following are valid command syntax:
   * `login PW`: Authenticate with `xrxs` -- password is hashed against realm password hash.
   * `logout`: Gracefully remove yourself from the users table.
   * `load CART`: Load a cartridge.
@@ -39,6 +39,8 @@ This is the working structure of the 9p filesystem:
 
 * `/grandom`: Read-only, get a random number from 0 to 99 -- These are doled out on a per-realm basis, and the number stays the same until everyone in the realm has had a chance to read it. If you've already read it this round or aren't in a realm, it will be empty.
 
+* `/version`: Read-only, outputs the version of the `xrxs` server.
+
 ### realm format
 
 Each realm directory on the server should have the following files:

server/aux.h

@@ -11,6 +11,7 @@ typedef enum {
   SCOPE,
   RANDOM,
   GRANDOM,
+  VERSION
 } FileType;
 
 typedef struct Aux {

server/xrxs.c

@@ -17,6 +17,8 @@
 #include "realm.h"
 #include "user.h"
 
+char version[] = "0.1";
+
 int chatty9p = 0;
 
 static Tree* tree;
@@ -524,6 +526,13 @@ void read_grandom(Req* r) {
   respond(r, nil);
 }
 
+void read_version(Req* r) {
+  char buf[16];
+  sprintf(buf, "%s\n", version);
+  readstr(r, buf);
+  respond(r, nil);
+}
+
 void xrxs_read(Req* r) {
   Aux* a = r->fid->file->aux;
   switch (a->type) {
@@ -559,6 +568,9 @@ void xrxs_read(Req* r) {
     case GRANDOM:
       read_grandom(r);
       break;
+    case VERSION:
+      read_version(r);
+      break;
     default:
       respond(r, nil);
       break;
@@ -610,12 +622,17 @@ void threadmain(int argc, char* argv[]) {
     if (scmp(argv[i], "-d")) {
       chatty9p = 1;
     }
+    if (scmp(argv[i], "-v")) {
+      printf("xrxs v%s\n", version);
+      threadexits(0);
+    }
   }
 
   fs.foreground = 1;
   fs.tree = alloctree(nil, nil, DMDIR | 0777, fs_destroy_file);
   tree = fs.tree;
 
+  closefile(createfile(tree->root, "version", nil, 0400, create_aux(VERSION)));
   closefile(
     createfile(tree->root, "ctl", nil, DMAPPEND | 0600, create_aux(CTL)));
   closefile(createfile(tree->root, "carts", nil, 0400, create_aux(CARTS)));