QemuOpts: command line switches for the config file.

Adds -readconfig and -writeconfig command line switches to read/write QemuOpts from config file. In theory you should be able to do: qemu < machine config cmd line switches here > -writeconfig vm.cfg qemu -readconfig vm.cfg In practice it will not work. Not all command line switches are converted to QemuOpts, so you'll have to keep the not-yet converted ones on the second line. Also there might be bugs lurking which prevent even the converted ones from working correctly. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
qemu · Oct 14, 2009 · 715a664ac4ca3b9e44ffbc0ca41ecd91fbe96656 · 715a664
1 parent 42262ba
commit 715a664ac4ca3b9e44ffbc0ca41ecd91fbe96656
Unified Split

Showing with 35 additions and 0 deletions.

+5 −0 qemu-options.hx

+30 −0 vl.c
diff --git a/qemu-options.hx b/qemu-options.hx
@@ -1915,3 +1915,8 @@ DEF("semihosting", 0, QEMU_OPTION_semihosting,
 DEF("old-param", 0, QEMU_OPTION_old_param,
    "-old-param      old param mode\n")
 #endif
+  
+DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig,
+  
+    "-readconfig <file>\n")
+  
+DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig,
+  
+    "-writeconfig <file>\n"
+  
+    "                read/write config file")
diff --git a/vl.c b/vl.c
@@ -5364,6 +5364,36 @@ int main(int argc, char **argv, char **envp)
                xen_mode = XEN_ATTACH;
                break;
 #endif
+  
+            case QEMU_OPTION_readconfig:
+  
+                {
+  
+                    FILE *fp;
+  
+                    fp = fopen(optarg, "r");
+  
+                    if (fp == NULL) {
+  
+                        fprintf(stderr, "open %s: %s\n", optarg, strerror(errno));
+  
+                        exit(1);
+  
+                    }
+  
+                    if (qemu_config_parse(fp) != 0) {
+  
+                        exit(1);
+  
+                    }
+  
+                    fclose(fp);
+  
+                    break;
+  
+                }
+  
+            case QEMU_OPTION_writeconfig:
+  
+                {
+  
+                    FILE *fp;
+  
+                    if (strcmp(optarg, "-") == 0) {
+  
+                        fp = stdout;
+  
+                    } else {
+  
+                        fp = fopen(optarg, "w");
+  
+                        if (fp == NULL) {
+  
+                            fprintf(stderr, "open %s: %s\n", optarg, strerror(errno));
+  
+                            exit(1);
+  
+                        }
+  
+                    }
+  
+                    qemu_config_write(fp);
+  
+                    fclose(fp);
+  
+                    break;
+  
+                }
            }
        }
    }