From 91cda4e8f372602795e3a2f4bd2e3adaf9f82255 Mon Sep 17 00:00:00 2001
From: Greg Kurz <groug@kaod.org>
Date: Mon, 8 Jan 2018 11:18:23 +0100
Subject: fsdev: improve error handling of backend opts parsing

This patch changes some error messages in the backend opts parsing
code and convert backends to propagate QEMU Error objects instead
of calling error_report().

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-handle.c |  2 +-
 hw/9pfs/9p-local.c  | 33 +++++++++++++++++++--------------
 hw/9pfs/9p-proxy.c  | 16 +++++++++++++---
 3 files changed, 33 insertions(+), 18 deletions(-)

(limited to 'hw/9pfs')

diff --git a/hw/9pfs/9p-handle.c b/hw/9pfs/9p-handle.c
index 26ac90fc5c..e50941075b 100644
--- a/hw/9pfs/9p-handle.c
+++ b/hw/9pfs/9p-handle.c
@@ -652,7 +652,7 @@ static void handle_cleanup(FsContext *ctx)
     g_free(data);
 }
 
-static int handle_parse_opts(QemuOpts *opts, FsDriverEntry *fse)
+static int handle_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
 {
     const char *sec_model = qemu_opt_get(opts, "security_model");
     const char *path = qemu_opt_get(opts, "path");
diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index 155834db28..e1a4b844a5 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -1459,16 +1459,21 @@ static void local_cleanup(FsContext *ctx)
     g_free(data);
 }
 
-static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse)
+static void error_append_security_model_hint(Error **errp)
+{
+    error_append_hint(errp, "Valid options are: security_model="
+                      "[passthrough|mapped-xattr|mapped-file|none]\n");
+}
+
+static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
 {
     const char *sec_model = qemu_opt_get(opts, "security_model");
     const char *path = qemu_opt_get(opts, "path");
-    Error *err = NULL;
+    Error *local_err = NULL;
 
     if (!sec_model) {
-        error_report("Security model not specified, local fs needs security model");
-        error_printf("valid options are:"
-                     "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n");
+        error_setg(errp, "security_model property not set");
+        error_append_security_model_hint(errp);
         return -1;
     }
 
@@ -1482,20 +1487,20 @@ static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse)
     } else if (!strcmp(sec_model, "mapped-file")) {
         fse->export_flags |= V9FS_SM_MAPPED_FILE;
     } else {
-        error_report("Invalid security model %s specified", sec_model);
-        error_printf("valid options are:"
-                     "\t[passthrough|mapped-xattr|mapped-file|none]\n");
+        error_setg(errp, "invalid security_model property '%s'", sec_model);
+        error_append_security_model_hint(errp);
         return -1;
     }
 
     if (!path) {
-        error_report("fsdev: No path specified");
+        error_setg(errp, "path property not set");
         return -1;
     }
 
-    fsdev_throttle_parse_opts(opts, &fse->fst, &err);
-    if (err) {
-        error_reportf_err(err, "Throttle configuration is not valid: ");
+    fsdev_throttle_parse_opts(opts, &fse->fst, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        error_prepend(errp, "invalid throttle configuration: ");
         return -1;
     }
 
@@ -1507,11 +1512,11 @@ static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse)
             qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) & 0777;
     } else {
         if (qemu_opt_find(opts, "fmode")) {
-            error_report("fmode is only valid for mapped 9p modes");
+            error_setg(errp, "fmode is only valid for mapped security modes");
             return -1;
         }
         if (qemu_opt_find(opts, "dmode")) {
-            error_report("dmode is only valid for mapped 9p modes");
+            error_setg(errp, "dmode is only valid for mapped security modes");
             return -1;
         }
     }
diff --git a/hw/9pfs/9p-proxy.c b/hw/9pfs/9p-proxy.c
index 652940726e..f6fb7a408f 100644
--- a/hw/9pfs/9p-proxy.c
+++ b/hw/9pfs/9p-proxy.c
@@ -1111,17 +1111,27 @@ static int connect_namedsocket(const char *path)
     return sockfd;
 }
 
-static int proxy_parse_opts(QemuOpts *opts, FsDriverEntry *fs)
+static void error_append_socket_sockfd_hint(Error **errp)
+{
+    error_append_hint(errp, "Either specify socket=/some/path where /some/path"
+                      " points to a listening AF_UNIX socket or sock_fd=fd"
+                      " where fd is a file descriptor to a connected AF_UNIX"
+                      " socket\n");
+}
+
+static int proxy_parse_opts(QemuOpts *opts, FsDriverEntry *fs, Error **errp)
 {
     const char *socket = qemu_opt_get(opts, "socket");
     const char *sock_fd = qemu_opt_get(opts, "sock_fd");
 
     if (!socket && !sock_fd) {
-        error_report("Must specify either socket or sock_fd");
+        error_setg(errp, "both socket and sock_fd properties are missing");
+        error_append_socket_sockfd_hint(errp);
         return -1;
     }
     if (socket && sock_fd) {
-        error_report("Both socket and sock_fd options specified");
+        error_setg(errp, "both socket and sock_fd properties are set");
+        error_append_socket_sockfd_hint(errp);
         return -1;
     }
     if (socket) {
-- 
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