udevadm: add --wait-for-initialization option to "udevadm info"

man/udevadm.xml

@@ -175,6 +175,14 @@
             <para>Cleanup the udev database.</para>
           </listitem>
         </varlistentry>
+        <varlistentry>
+          <term><option>-w<optional>SECONDS</optional></option></term>
+          <term><option>--wait-for-initialization<optional>=SECONDS</optional></option></term>
+          <listitem>
+            <para>Wait for device to be initialized. If argument <replaceable>SECONDS</replaceable>
+            is not specified, the default is to wait forever.</para>
+          </listitem>
+        </varlistentry>
 
         <xi:include href="standard-options.xml" xpointer="help" />
       </variablelist>

shell-completion/bash/udevadm

@@ -48,7 +48,8 @@ _udevadm() {
     local -A OPTS=(
         [COMMON]='-h --help -V --version'
         [DEBUG]='-d --debug'
-        [INFO_STANDALONE]='-r --root -a --attribute-walk -x --export -e --export-db -c --cleanup-db'
+        [INFO_STANDALONE]='-r --root -a --attribute-walk -x --export -e --export-db -c --cleanup-db
+                           -w --wait-for-initialization'
         [INFO_ARG]='-q --query -p --path -n --name -P --export-prefix -d --device-id-of-file'
         [TRIGGER_STANDALONE]='-v --verbose -n --dry-run -w --settle --wait-daemon'
         [TRIGGER_ARG]='-t --type -c --action -s --subsystem-match -S --subsystem-nomatch

src/udev/udevadm-info.c

@@ -20,6 +20,7 @@
 #include "fd-util.h"
 #include "string-table.h"
 #include "string-util.h"
+#include "udev-util.h"
 #include "udevadm-util.h"
 #include "udevadm.h"
 
@@ -40,6 +41,7 @@ typedef enum QueryType {
 static bool arg_root = false;
 static bool arg_export = false;
 static const char *arg_export_prefix = NULL;
+static usec_t arg_wait_for_initialization_timeout = 0;
 
 static bool skip_attribute(const char *name) {
         static const char* const skip[] = {
@@ -329,6 +331,8 @@ static int help(void) {
                "  -P --export-prefix          Export the key name with a prefix\n"
                "  -e --export-db              Export the content of the udev database\n"
                "  -c --cleanup-db             Clean up the udev database\n"
+               "  -w --wait-for-initialization[=SECONDS]\n"
+               "                              Wait for device to be initialized\n"
                , program_invocation_short_name);
 
         return 0;
@@ -350,6 +354,7 @@ int info_main(int argc, char *argv[], void *userdata) {
                 { "device-id-of-file",       required_argument, NULL, 'd' },
                 { "export",                  no_argument,       NULL, 'x' },
                 { "export-prefix",           required_argument, NULL, 'P' },
+                { "wait-for-initialization", optional_argument, NULL, 'w' },
                 { "version",                 no_argument,       NULL, 'V' },
                 { "help",                    no_argument,       NULL, 'h' },
                 {}
@@ -358,7 +363,7 @@ int info_main(int argc, char *argv[], void *userdata) {
         ActionType action = ACTION_QUERY;
         QueryType query = QUERY_ALL;
 
-        while ((c = getopt_long(argc, argv, "aced:n:p:q:rxP:Vh", options, NULL)) >= 0)
+        while ((c = getopt_long(argc, argv, "aced:n:p:q:rxP:w::Vh", options, NULL)) >= 0)
                 switch (c) {
                 case 'n':
                 case 'p': {
@@ -414,6 +419,14 @@ int info_main(int argc, char *argv[], void *userdata) {
                         arg_export = true;
                         arg_export_prefix = optarg;
                         break;
+                case 'w':
+                        if (optarg) {
+                                r = parse_sec(optarg, &arg_wait_for_initialization_timeout);
+                                if (r < 0)
+                                        return log_error_errno(r, "Failed to parse timeout value: %m");
+                        } else
+                                arg_wait_for_initialization_timeout = USEC_INFINITY;
+                        break;
                 case 'V':
                         return print_version();
                 case 'h':
@@ -453,6 +466,12 @@ int info_main(int argc, char *argv[], void *userdata) {
                 if (r < 0)
                         return log_error_errno(r, "Unknown device \"%s\": %m",  *p);
 
+                if (arg_wait_for_initialization_timeout > 0) {
+                        r = device_wait_for_initialization(device, NULL, arg_wait_for_initialization_timeout, NULL);
+                        if (r < 0)
+                                return r;
+                }
+
                 if (action == ACTION_QUERY)
                         r = query_device(query, device);
                 else if (action == ACTION_ATTRIBUTE_WALK)