[Qemu-devel] [PATCH v1 6/6] qemu-img: copy *key-secret opts when opening newly created files

["Daniel P. Berrange" <berrange@redhat.com>]

The qemu-img dd/convert commands will create a image file and
then try to open it. Historically it has been possible to open
new files without passing any options. With encrypted files
though, the *key-secret options are mandatory, so we need to
provide those options when opening the newlky created file.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 qemu-img.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 4 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index a751781..130cec7 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -317,6 +317,49 @@ static BlockBackend *img_open_file(const char *filename,
 }
 
 
+static int img_add_key_secrets(void *opaque,
+                               const char *name, const char *value,
+                               Error **errp)
+{
+    QDict **options = opaque;
+
+    if (g_str_has_suffix(name, "key-secret")) {
+        if (!*options) {
+            *options = qdict_new();
+        }
+        qdict_put(*options, name, qstring_from_str(value));
+    }
+
+    return 0;
+}
+
+static BlockBackend *img_open_new_file(const char *filename,
+                                       QemuOpts *create_opts,
+                                       const char *fmt, int flags,
+                                       bool writethrough, bool quiet)
+{
+    BlockBackend *blk;
+    Error *local_err = NULL;
+    QDict *options = NULL;
+
+    if (fmt) {
+        options = qdict_new();
+        qdict_put(options, "driver", qstring_from_str(fmt));
+    }
+
+    qemu_opt_foreach(create_opts, img_add_key_secrets, &options, NULL);
+
+    blk = blk_new_open(filename, NULL, options, flags, &local_err);
+    if (!blk) {
+        error_reportf_err(local_err, "Could not open '%s': ", filename);
+        return NULL;
+    }
+    blk_set_enable_write_cache(blk, !writethrough);
+
+    return blk;
+}
+
+
 static BlockBackend *img_open(bool image_opts,
                               const char *filename,
                               const char *fmt, int flags, bool writethrough,
@@ -2113,8 +2156,8 @@ static int img_convert(int argc, char **argv)
          * That has to wait for bdrv_create to be improved
          * to allow filenames in option syntax
          */
-        out_blk = img_open_file(out_filename, out_fmt,
-                                flags, writethrough, quiet);
+        out_blk = img_open_new_file(out_filename, opts, out_fmt,
+                                    flags, writethrough, quiet);
     }
     if (!out_blk) {
         ret = -1;
@@ -4179,8 +4222,8 @@ static int img_dd(int argc, char **argv)
          * That has to wait for bdrv_create to be improved
          * to allow filenames in option syntax
          */
-        blk2 = img_open_file(out.filename, out_fmt,
-                             BDRV_O_RDWR, false, false);
+        blk2 = img_open_new_file(out.filename, opts, out_fmt,
+                                 BDRV_O_RDWR, false, false);
     }
 
     if (!blk2) {
-- 
2.9.3