commit 235e59cf03ed75d0ce96c97343194ed11c146231
author Markus Armbruster <armbru@redhat.com> Tue Jul 07 18:05:42 2020 +0200
committer Markus Armbruster <armbru@redhat.com> Fri Jul 10 15:17:35 2020 +0200
tree c2de9b6a66355d038fe4ccb4d79de13905101b52
parent c75d7f71918b8497a710f3f2b646567c09db3770

qemu-option: Use returned bool to check for failure

The previous commit enables conversion of

    foo(..., &err);
    if (err) {
        ...
    }

to

    if (!foo(..., &err)) {
        ...
    }

for QemuOpts functions that now return true / false on success /
error.  Coccinelle script:

    @@
    identifier fun = {
        opts_do_parse, parse_option_bool, parse_option_number,
        parse_option_size, qemu_opt_parse, qemu_opt_rename, qemu_opt_set,
        qemu_opt_set_bool, qemu_opt_set_number, qemu_opts_absorb_qdict,
        qemu_opts_do_parse, qemu_opts_from_qdict_entry, qemu_opts_set,
        qemu_opts_validate
    };
    expression list args, args2;
    typedef Error;
    Error *err;
    @@
    -    fun(args, &err, args2);
    -    if (err)
    +    if (!fun(args, &err, args2))
         {
             ...
         }

A few line breaks tidied up manually.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-15-armbru@redhat.com>
[Conflict with commit 0b6786a9c1 "block/amend: refactor qcow2 amend
options" resolved by rerunning Coccinelle on master's version]

qemu-img.c

diff --git a/qemu-img.c b/qemu-img.c
index 53bd32b..41d2b91 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -468,8 +468,8 @@
     Error *err = NULL;
 
     if (base_filename) {
-        qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &err);
-        if (err) {
+        if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename,
+                          &err)) {
             error_report("Backing file not supported for file format '%s'",
                          fmt);
             error_free(err);
@@ -477,8 +477,7 @@
         }
     }
     if (base_fmt) {
-        qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &err);
-        if (err) {
+        if (!qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &err)) {
             error_report("Backing file format not supported for file "
                          "format '%s'", fmt);
             error_free(err);
@@ -2487,8 +2486,7 @@
 
         opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
         if (options) {
-            qemu_opts_do_parse(opts, options, NULL, &local_err);
-            if (local_err) {
+            if (!qemu_opts_do_parse(opts, options, NULL, &local_err)) {
                 error_report_err(local_err);
                 ret = -1;
                 goto out;
@@ -3963,8 +3961,7 @@
 
     /* Parse size */
     param = qemu_opts_create(&resize_options, NULL, 0, &error_abort);
-    qemu_opt_set(param, BLOCK_OPT_SIZE, size, &err);
-    if (err) {
+    if (!qemu_opt_set(param, BLOCK_OPT_SIZE, size, &err)) {
         error_report_err(err);
         ret = -1;
         qemu_opts_del(param);
@@ -4215,9 +4212,7 @@
 
     amend_opts = qemu_opts_append(amend_opts, bs->drv->amend_opts);
     opts = qemu_opts_create(amend_opts, NULL, 0, &error_abort);
-    qemu_opts_do_parse(opts, options, NULL, &err);
-
-    if (err) {
+    if (!qemu_opts_do_parse(opts, options, NULL, &err)) {
         /* Try to parse options using the create options */
         Error *err1 = NULL;
         amend_opts = qemu_opts_append(amend_opts, bs->drv->create_opts);
@@ -5363,8 +5358,7 @@
     create_opts = qemu_opts_append(create_opts, bdrv_file.create_opts);
     opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
     if (options) {
-        qemu_opts_do_parse(opts, options, NULL, &local_err);
-        if (local_err) {
+        if (!qemu_opts_do_parse(opts, options, NULL, &local_err)) {
             error_report_err(local_err);
             error_report("Invalid options for file format '%s'", out_fmt);
             goto out;