[Qemu-block] [PATCH v5 05/10] qemu-io: allow specifying image as a set of options args

[Daniel P. Berrange]

Currently qemu-io allows an image filename to be passed on the
command line, but unless using the JSON format, it does not have
a way to set any options except the format eg

 qemu-io https://127.0.0.1/images/centos7.iso
 qemu-io /home/berrange/demo.qcow2

This adds a --image-opts arg that indicates that the positional
filename should be interpreted as a full option string, not
just a filename.

 qemu-io --image-opts driver=https,url=https://127.0.0.1/images,sslverify=off
 qemu-io --image-opts driver=file,filename=/home/berrange/demo.qcow2

This flag is mutually exclusive with the '-f' flag.

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 qemu-io.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/qemu-io.c b/qemu-io.c
index 65a28e4..3544fd7 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -366,6 +366,7 @@ static void reenable_tty_echo(void)
 
 enum {
     OPTION_OBJECT = 256,
+    OPTION_IMAGE_OPTS = 257,
 };
 
 static QemuOptsList qemu_object_opts = {
@@ -378,6 +379,16 @@ static QemuOptsList qemu_object_opts = {
 };
 
 
+static QemuOptsList file_opts = {
+    .name = "file",
+    .implied_opt_name = "file",
+    .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
+    .desc = {
+        /* no elements => accept any params */
+        { /* end of list */ }
+    },
+};
+
 int main(int argc, char **argv)
 {
     int readonly = 0;
@@ -397,6 +408,7 @@ int main(int argc, char **argv)
         { "cache", 1, NULL, 't' },
         { "trace", 1, NULL, 'T' },
         { "object", 1, NULL, OPTION_OBJECT },
+        { "image-opts", 0, NULL, OPTION_IMAGE_OPTS },
         { NULL, 0, NULL, 0 }
     };
     int c;
@@ -404,6 +416,7 @@ int main(int argc, char **argv)
     int flags = BDRV_O_UNMAP;
     Error *local_error = NULL;
     QDict *opts = NULL;
+    bool imageOpts = false;
 
 #ifdef CONFIG_POSIX
     signal(SIGPIPE, SIG_IGN);
@@ -473,6 +486,9 @@ int main(int argc, char **argv)
                 exit(1);
             }
         }   break;
+        case OPTION_IMAGE_OPTS:
+            imageOpts = true;
+            break;
         default:
             usage(progname);
             exit(1);
@@ -515,7 +531,20 @@ int main(int argc, char **argv)
         flags |= BDRV_O_RDWR;
     }
 
-    if ((argc - optind) == 1) {
+    if (imageOpts) {
+        QemuOpts *qopts;
+        qopts = qemu_opts_parse_noisily(&file_opts, argv[optind], false);
+        if (!qopts) {
+            exit(1);
+        }
+        if (opts) {
+            error_report("--image-opts and -f are mutually exclusive");
+            exit(1);
+        }
+        opts = qemu_opts_to_qdict(qopts, NULL);
+        qemu_opts_reset(&file_opts);
+        openfile(NULL, flags, opts);
+    } else if ((argc - optind) == 1) {
         openfile(argv[optind], flags, opts);
     }
     command_loop();
-- 
2.5.0