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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>
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1 parent 42262ba commit 715a664ac4ca3b9e44ffbc0ca41ecd91fbe96656 @kraxel kraxel committed with Anthony Liguori Oct 14, 2009
Showing with 35 additions and 0 deletions.
  1. +5 −0 qemu-options.hx
  2. +30 −0 vl.c
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@@ -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")
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@@ -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;
+ }
}
}
}

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