IMPORT allow to import program returned keys into the env

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

test/udev-test.pl

@@ -259,13 +259,23 @@ BUS=="scsi", ID=="0:0:0:0", NAME="M%M-m%m-n%n-b%3b-s%3s{vendor}"
 EOF
 	},
 	{
-		desc		=> "import of shellvalue file",
+		desc		=> "import of shell-value file",
 		subsys		=> "block",
 		devpath		=> "/block/sda",
 		exp_name	=> "subdir/sys/node" ,
 		rules		=> <<EOF
 BUS=="scsi", IMPORT="test.all", NAME="subdir%E{SYSFSDIR}/node"
 KERNEL=="ttyUSB0", NAME="visor"
+EOF
+	},
+	{
+		desc		=> "import of shell-value returned from program",
+		subsys		=> "block",
+		devpath		=> "/block/sda",
+		exp_name	=> "node12345678",
+		rules		=> <<EOF
+BUS=="scsi", IMPORT{exec}="/bin/echo -e \' TEST_KEY=12345678  \\n  TEST_key2=98765 \'", NAME="node\$env{TEST_KEY}"
+KERNEL=="ttyUSB0", NAME="visor"
 EOF
 	},
 	{

udev_rules.c

@@ -241,8 +241,8 @@ static int import_keys_into_env(const char *buf, size_t bufsize)
 
 		linepos = line;
 		if (get_key(&linepos, &variable, &value) == 0) {
-			dbg("import %s=%s", variable, value);
+			dbg("import '%s=%s'", variable, value);
-			setenv(variable, value, 0);
+			setenv(variable, value, 1);
 		}
 	}
 
@@ -264,11 +264,18 @@ static int import_file_into_env(const char *filename)
 	return 0;
 }
 
-/** Finds the lowest positive N such that <name>N isn't present in 
+static int import_program_into_env(struct udevice *udev, const char *program)
- *  $(udevroot) either as a file or a symlink.
+{
- *
+	char result[1024];
- *  @param  name                Name to check for
+	size_t reslen;
- *  @return                     0 if <name> didn't exist and N otherwise.
+
+	if (execute_program(program, udev->subsystem, result, sizeof(result), &reslen) != 0)
+		return -1;
+	return import_keys_into_env(result, reslen);
+}
+
+/* finds the lowest positive N such that <name>N isn't present in the udevdb
+ * if <name> doesn't exist, 0 is returned, N otherwise
  */
 static int find_free_number(struct udevice *udev, const char *name)
 {
@@ -811,16 +818,24 @@ try_parent:
 	/* import variables from file into environment */
 	if (rule->import_operation != KEY_OP_UNSET) {
 		char import[PATH_SIZE];
+		int rc = -1;
 
 		strlcpy(import, rule->import, sizeof(import));
 		apply_format(udev, import, sizeof(import), class_dev, sysfs_device);
-		dbg("check for " KEY_IMPORT " import='%s", import);
+		dbg("check for " KEY_IMPORT " import='%s'", import);
-		if (import_file_into_env(import) != 0) {
+		if (rule->import_exec) {
+			dbg("run executable file import='%s'", import);
+			rc = import_program_into_env(udev, import);
+		} else {
+			dbg("import file import='%s'", import);
+			rc = import_file_into_env(import);
+		}
+		if (rc) {
 			dbg(KEY_IMPORT " failed");
 			if (rule->import_operation != KEY_OP_NOMATCH)
 				goto exit;
 		} else
-			dbg(KEY_IMPORT " file '%s' imported", rule->import);
+			dbg(KEY_IMPORT " '%s' imported", rule->import);
 		dbg(KEY_IMPORT " key is true");
 	}
 

udev_rules.h

@@ -99,10 +99,11 @@ struct udev_rule {
 	int sysfs_pair_count;
 	struct key_pair env_pair[KEY_ENV_PAIRS_MAX];
 	int env_pair_count;
+	char modalias[NAME_SIZE];
 	enum key_operation modalias_operation;
-	char modalias[PATH_SIZE];
-	enum key_operation import_operation;
 	char import[PATH_SIZE];
+	enum key_operation import_operation;
+	int import_exec;
 
 	char name[PATH_SIZE];
 	enum key_operation name_operation;

udev_rules_parse.c

@@ -375,7 +375,12 @@ static int rules_parse(const char *filename)
 				continue;
 			}
 
-			if (strcasecmp(key, KEY_IMPORT) == 0) {
+			if (strncasecmp(key, KEY_IMPORT, sizeof(KEY_IMPORT)-1) == 0) {
+				attr = get_key_attribute(key + sizeof(KEY_IMPORT)-1);
+				if (attr && strstr(attr, "exec")) {
+					dbg(KEY_IMPORT" will be executed");
+					rule.import_exec = 1;
+				}
 				strlcpy(rule.import, value, sizeof(rule.import));
 				rule.import_operation = operation;
 				valid = 1;
@@ -411,7 +416,6 @@ static int rules_parse(const char *filename)
 						dbg("creation of partition nodes requested");
 						rule.partitions = DEFAULT_PARTITIONS_COUNT;
 					}
-					/* FIXME: remove old style option and make OPTIONS= mandatory */
 					if (strstr(attr, OPTION_IGNORE_REMOVE) != NULL) {
 						dbg("remove event should be ignored");
 						rule.ignore_remove = 1;