replace libsysfs

We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.

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

1 files changed, 110 insertions, 116 deletions

diff --git a/extras/usb_id/usb_id.c b/extras/usb_id/usb_id.c
index b7d67958c9..0bcd267f67 100644
--- a/extras/usb_id/usb_id.c
+++ b/extras/usb_id/usb_id.c
@@ -21,12 +21,10 @@
 #include <ctype.h>
 #include <errno.h>
 
-#include <../../libsysfs/sysfs/libsysfs.h>
-#include "../../udev_utils.h"
-#include "../../logging.h"
+#include "../../udev.h"
 
-#define	MAX_NAME_LEN			72
-#define	MAX_SERIAL_LEN			256
+#define MAX_NAME_LEN			72
+#define MAX_SERIAL_LEN			256
 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
 
 #ifdef USE_LOG
@@ -54,7 +52,6 @@ void log_message(int priority, const char *format, ...)
 }
 #endif
 
-char sysfs_mnt_path[SYSFS_PATH_MAX];
 static char vendor_str[64];
 static char model_str[64];
 static char serial_str[MAX_SERIAL_LEN];
@@ -245,182 +242,176 @@ static void set_scsi_type(char *to, const char *from, int count)
  * 6.) If the device supplies a serial number, this number
  *     is concatenated with the identification with an underscore '_'.
  */
-static int usb_id(const char *target_path)
+static int usb_id(const char *devpath)
 {
-	struct sysfs_class_device *class_dev; /* of target_path */
-	struct sysfs_class_device *class_dev_parent; /* for partitions */
-	struct sysfs_device *scsi_dev; /* the scsi_device */
-	struct sysfs_device *target_dev;
-	struct sysfs_device *host_dev, *interface_dev, *usb_dev;
-	struct sysfs_attribute *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
-	struct sysfs_attribute *usb_model = NULL, *usb_vendor = NULL, *usb_rev, *usb_serial;
-	struct sysfs_attribute *if_class, *if_subclass;
+	struct sysfs_device *dev;
+	struct sysfs_device *dev_scsi;
+	struct sysfs_device *dev_target;
+	struct sysfs_device *dev_host, *dev_interface, *dev_usb;
+	const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
+	const char *usb_model = NULL, *usb_vendor = NULL, *usb_rev, *usb_serial;
+	const char *if_class, *if_subclass;
 	int if_class_num;
 	int protocol = 0;
 
-	class_dev = sysfs_open_class_device_path(target_path);
-	if (!class_dev) {
-		info("open class %s failed: %s", target_path, strerror(errno));
+	dbg("devpath %s\n", devpath);
+
+	dev = sysfs_device_get(devpath);
+	if (dev == NULL) {
+		err("unable to access '%s'", devpath);
 		return 1;
 	}
-	class_dev_parent = sysfs_get_classdev_parent(class_dev);
-	if (class_dev_parent) {
-		scsi_dev = sysfs_get_classdev_device(class_dev_parent);
-	} else {
-		scsi_dev = sysfs_get_classdev_device(class_dev);
-	}
 
-	/*
-	 * The close of scsi_dev will close class_dev or class_dev_parent.
-	 */
-
-	/*
-	 * We assume we are called after the device is completely ready,
-	 * so we don't have to loop here like udev. (And we are usually
-	 * called via udev.)
-	 */
-	if (!scsi_dev) {
-		/*
-		 * errno is not set if we can't find the device link, so
-		 * don't print it out here.
-		 */
-		info("Cannot find sysfs device associated with %s", target_path);
+	/* get scsi parent device */
+	dev_scsi = sysfs_device_get_parent(dev);
+	if (dev_scsi == NULL) {
+		err("unable to access parent device of '%s'", devpath);
 		return 1;
 	}
-
-	/*
-	 * Allow only scsi devices.
-	 *
-	 * Other block devices can support SG IO, but only ide-cd does, so
-	 * for now, don't bother with anything else.
-	 */
-	if (strcmp(scsi_dev->bus, "scsi") != 0) {
-		info("%s is not a scsi device", target_path);
+	/* allow only scsi devices */
+	if (strcmp(dev_scsi->subsystem, "scsi") != 0) {
+		info("%s is not a scsi device", devpath);
 		return 1;
 	}
 
 	/* target directory */
-	target_dev = sysfs_get_device_parent(scsi_dev);
+	dev_target = sysfs_device_get_parent(dev_scsi);
+	if (dev_target == NULL) {
+		err("unable to access parent device of '%s'", devpath);
+		return 1;
+	}
+
 	/* host directory */
-	host_dev = sysfs_get_device_parent(target_dev);
+	dev_host = sysfs_device_get_parent(dev_target);
+	if (dev_host == NULL) {
+		err("unable to access parent device of '%s'", devpath);
+		return 1;
+	}
+
 	/* usb interface directory */
-	interface_dev = sysfs_get_device_parent(host_dev);
-	/* usb device directory */
-	usb_dev = sysfs_get_device_parent(interface_dev);
+	dev_interface = sysfs_device_get_parent(dev_host);
+	if (dev_interface == NULL) {
+		err("unable to access parent device of '%s'", devpath);
+		return 1;
+	}
 
-	if (strcmp(interface_dev->bus, "usb") != 0) {
-		info("%s is not an usb device", target_path);
+	/* usb device directory */
+	dev_usb = sysfs_device_get_parent(dev_interface);
+	if (dev_usb == NULL) {
+		err("unable to access parent device of '%s'", devpath);
+		return 1;
+	}
+	if (strcmp(dev_interface->subsystem, "usb") != 0) {
+		info("%s is not an usb device", devpath);
 		return 1;
 	}
 
-	if_class = sysfs_get_device_attr(interface_dev, "bInterfaceClass");
+	if_class = sysfs_attr_get_value(dev_interface->devpath, "bInterfaceClass");
 	if (!if_class) {
-		info("%s: cannot get bInterfaceClass attribute", interface_dev->name);
+		info("%s: cannot get bInterfaceClass attribute", dev_interface->kernel_name);
 		return 1;
 	}
-	if_class_num = strtoul(if_class->value, NULL, 16);
+	if_class_num = strtoul(if_class, NULL, 16);
 	if (if_class_num != 8) {
-		set_usb_iftype(type_str, if_class->value, sizeof(type_str) - 1);
+		set_usb_iftype(type_str, if_class, sizeof(type_str)-1);
 		protocol = 0;
 	} else {
-		if_subclass = sysfs_get_device_attr(interface_dev, 
-						    "bInterfaceSubClass");
-		protocol = set_usb_ifsubtype(type_str, if_subclass->value, 
-					     sizeof(type_str) -1 );
+		if_subclass = sysfs_attr_get_value(dev_interface->devpath, "bInterfaceSubClass");
+		protocol = set_usb_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
 	}
 
 	if (!use_usb_info && protocol == 6) {
 		/* Generic SPC-2 device */
-		scsi_vendor = sysfs_get_device_attr(scsi_dev, "vendor");
+		scsi_vendor = sysfs_attr_get_value(dev_scsi->devpath, "vendor");
 		if (!scsi_vendor) {
-			info("%s: cannot get SCSI vendor attribute", scsi_dev->name);
+			info("%s: cannot get SCSI vendor attribute", dev_scsi->kernel_name);
 			return 1;
 		}
-		set_str(vendor_str, scsi_vendor->value, sizeof(vendor_str)-1);
+		set_str(vendor_str, scsi_vendor, sizeof(vendor_str)-1);
 
-		scsi_model = sysfs_get_device_attr(scsi_dev, "model");
+		scsi_model = sysfs_attr_get_value(dev_scsi->devpath, "model");
 		if (!scsi_model) {
-			info("%s: cannot get SCSI model attribute", scsi_dev->name);
+			info("%s: cannot get SCSI model attribute", dev_scsi->kernel_name);
 			return 1;
 		}
-		set_str(model_str, scsi_model->value, sizeof(model_str)-1);
+		set_str(model_str, scsi_model, sizeof(model_str)-1);
 
-		scsi_type = sysfs_get_device_attr(scsi_dev, "type");
+		scsi_type = sysfs_attr_get_value(dev_scsi->devpath, "type");
 		if (!scsi_type) {
-			info("%s: cannot get SCSI type attribute", scsi_dev->name);
+			info("%s: cannot get SCSI type attribute", dev_scsi->kernel_name);
 			return 1;
 		}
-		set_scsi_type(type_str, scsi_type->value, sizeof(type_str)-1);
+		set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
 
-		scsi_rev = sysfs_get_device_attr(scsi_dev, "rev");
+		scsi_rev = sysfs_attr_get_value(dev_scsi->devpath, "rev");
 		if (!scsi_rev) {
-			info("%s: cannot get SCSI revision attribute", scsi_dev->name);
+			info("%s: cannot get SCSI revision attribute", dev_scsi->kernel_name);
 			return 1;
 		}
-		set_str(revision_str, scsi_rev->value, sizeof(revision_str)-1);
+		set_str(revision_str, scsi_rev, sizeof(revision_str)-1);
 
 	}
 
 	/* Fallback to USB vendor & device */
 	if (vendor_str[0] == '\0') {
 		if (!use_num_info)
-			if (!(usb_vendor = sysfs_get_device_attr(usb_dev, "manufacturer")))
+			if (!(usb_vendor = sysfs_attr_get_value(dev_usb->devpath, "manufacturer")))
 				dbg("No USB vendor string found, using idVendor");
 
 		if (!usb_vendor) {
-			if (!(usb_vendor = sysfs_get_device_attr(usb_dev, "idVendor"))) {
+			if (!(usb_vendor = sysfs_attr_get_value(dev_usb->devpath, "idVendor"))) {
 				dbg("No USB vendor information available\n");
 				sprintf(vendor_str,"0000");
 			}
 		}
-		set_str(vendor_str,usb_vendor->value, sizeof(vendor_str) - 1);
+		set_str(vendor_str,usb_vendor, sizeof(vendor_str) - 1);
 	}
 	
 	if (model_str[0] == '\0') {
 		if (!use_num_info)
-			if (!(usb_model = sysfs_get_device_attr(usb_dev, "product")))
+			if (!(usb_model = sysfs_attr_get_value(dev_usb->devpath, "product")))
 				dbg("No USB model string found, using idProduct");
 		
 		if (!usb_model) {
-			if (!(usb_model = sysfs_get_device_attr(usb_dev, "idProduct"))) {
-				dbg("No USB model information available\n");
-				sprintf(model_str,"0000");
-			}
+			if (!(usb_model = sysfs_attr_get_value(dev_usb->devpath, "idProduct")))
+				dbg("No USB model information available\n"); sprintf(model_str,"0000");
 		}
-		set_str(model_str, usb_model->value, sizeof(model_str) - 1);
+		set_str(model_str, usb_model, sizeof(model_str) - 1);
 	}
 
 	if (revision_str[0] == '\0') {
-		usb_rev = sysfs_get_device_attr(usb_dev, "bcdDevice");
-		if (usb_rev) {
-			set_str(revision_str, usb_rev->value, 
-				sizeof(revision_str) - 1);
-		}
+		usb_rev = sysfs_attr_get_value(dev_usb->devpath, "bcdDevice");
+		if (usb_rev)
+			set_str(revision_str, usb_rev, sizeof(revision_str)-1);
 	}
 
 	if (serial_str[0] == '\0') {
-		usb_serial = sysfs_get_device_attr(usb_dev, "serial");
-		if (usb_serial) {
-			set_str(serial_str, usb_serial->value,
-				sizeof(serial_str) - 1);
-		}
+		usb_serial = sysfs_attr_get_value(dev_usb->devpath, "serial");
+		if (usb_serial)
+			set_str(serial_str, usb_serial, sizeof(serial_str)-1);
 	}
 	return 0;
 }
 
 int main(int argc, char **argv)
 {
-	int retval;
-	char *devpath;
-	char target_path[MAX_NAME_LEN];
+	int retval = 0;
+	const char *env;
+	char devpath[MAX_NAME_LEN];
 	int option;
 
+	logging_init("usb_id");
+	sysfs_init();
+
 	dbg("argc is %d", argc);
-	if (sysfs_get_mnt_path(sysfs_mnt_path, MAX_NAME_LEN)) {
-		info("sysfs_get_mnt_path failed: %s",
-			strerror(errno));
-		exit(1);
-	}
+
+	/* sysfs path can be overridden for testing */
+	env = getenv("SYSFS_PATH");
+	if (env) {
+		strlcpy(sysfs_path, env, sizeof(sysfs_path));
+		remove_trailing_chars(sysfs_path, '/');
+	} else
+		strcpy(sysfs_path, "/sys");
 
 	while ((option = getopt(argc, argv, "dnux")) != -1 ) {
 		if (optarg)
@@ -433,14 +424,14 @@ int main(int argc, char **argv)
 			debug = 1;
 			break;
 		case 'n':
-			use_num_info=1;
-			use_usb_info=1;
+			use_num_info = 1;
+			use_usb_info = 1;
 			break;
 		case 'u':
-			use_usb_info=1;
+			use_usb_info = 1;
 			break;
 		case 'x':
-			export=1;
+			export = 1;
 			break;
 		default:
 			info("Unknown or bad option '%c' (0x%x)", option, option);
@@ -449,20 +440,19 @@ int main(int argc, char **argv)
 		}
 	}
 
-	devpath = getenv("DEVPATH");
-	if (devpath) {
-		strncpy(target_path, sysfs_mnt_path, MAX_NAME_LEN);
-		strncat(target_path, devpath, MAX_NAME_LEN);
-	} else {
+	env = getenv("DEVPATH");
+	if (env != NULL)
+		strlcpy(devpath, env, sizeof(devpath));
+	else {
 		if (optind == argc) {
 			fprintf(stderr, "No device specified\n");
-			exit(1);
+			retval = 1;
+			goto exit;
 		}
-		devpath = argv[optind];
-		strncpy(target_path, devpath, MAX_NAME_LEN);
+		strlcpy(devpath, argv[optind], sizeof(devpath));
 	}
 
-	retval = usb_id(target_path);
+	retval = usb_id(devpath);
 
 	if (retval == 0) {
 		if (export) {
@@ -488,5 +478,9 @@ int main(int argc, char **argv)
 			}
 		}
 	}
-	exit(retval);
+
+exit:
+	sysfs_cleanup();
+	logging_close();
+	return retval;
 }