Use volume UUIDs on macOS

Makefile.am

@@ -3,6 +3,10 @@ check_PROGRAMS = mktest mkstream
 
 AM_CPPFLAGS = -DSYSCONFDIR="\"${sysconfdir}\""
 
+if HAVE_DISK_ARBITRATION
+snapraid_LDFLAGS = -framework CoreFoundation -framework DiskArbitration
+endif
+
 snapraid_SOURCES = \
 	raid/raid.c \
 	raid/check.c \
@@ -44,7 +48,8 @@ snapraid_SOURCES = \
 	cmdline/import.c \
 	cmdline/search.c \
 	cmdline/mingw.c \
-	cmdline/unix.c
+	cmdline/unix.c \
+	cmdline/mac.c
 
 noinst_HEADERS = \
 	raid/raid.h \
@@ -88,7 +93,8 @@ noinst_HEADERS = \
 	cmdline/import.h \
 	cmdline/search.h \
 	cmdline/mingw.h \
-	cmdline/unix.h
+	cmdline/unix.h \
+	cmdline/mac.h
 
 mktest_SOURCES = \
 	cmdline/mktest.c \

cmdline/mac.c

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2011 Andrea Mazzoleni
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef __APPLE__
+
+#include "mac.h"
+#include <CoreFoundation/CoreFoundation.h>
+#include <DiskArbitration/DiskArbitration.h>
+
+int devuuid_macos(char *path, char* uuid, size_t uuid_size) {
+	CFStringRef path_apple = CFStringCreateWithCString(kCFAllocatorDefault, path, kCFStringEncodingUTF8);
+	DASessionRef session = DASessionCreate(kCFAllocatorDefault);
+
+	CFURLRef path_appler = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, path_apple, kCFURLPOSIXPathStyle, false);
+	DADiskRef disk;
+	do {
+		disk = DADiskCreateFromVolumePath(kCFAllocatorDefault, session, path_appler);
+		if (disk) {
+			CFRelease(path_appler);
+			break;
+		} else {
+			CFURLRef parent_path_appler = CFURLCreateCopyDeletingLastPathComponent(kCFAllocatorDefault, path_appler);
+			CFRelease(path_appler);
+			path_appler = parent_path_appler;
+		}
+	} while (true); // This is guaranteed to succeed eventually because it'll hit `/`.
+
+	CFDictionaryRef description = DADiskCopyDescription(disk);
+	CFUUIDRef uuid_apple = CFDictionaryGetValue(description, kDADiskDescriptionVolumeUUIDKey);
+	CFStringRef uuid_string = CFUUIDCreateString(kCFAllocatorDefault, uuid_apple);
+	bool success = CFStringGetCString(uuid_string, uuid, uuid_size, kCFStringEncodingUTF8);
+	CFRelease(uuid_string);
+	CFRelease(description);
+	CFRelease(disk);
+	CFRelease(session);
+	CFRelease(path_apple);
+	if (success) {
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+#endif

cmdline/mac.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2011 Andrea Mazzoleni
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MAC_H
+#define __MAC_H
+#ifdef __APPLE__
+
+#include <stdint.h>
+#include <stdlib.h>
+
+int devuuid_macos(char *path, char* uuid, size_t uuid_size);
+
+#endif
+#endif

cmdline/portable.h

@@ -334,11 +334,13 @@ static inline int hardlink(const char* a, const char* b)
 	return link(a, b);
 }
 
+#ifndef __APPLE__ // Use devuuid_macos instead (different API).
 /**
  * Get the device UUID.
  * Return 0 on success.
  */
 int devuuid(uint64_t device, char* uuid, size_t size);
+#endif
 
 /**
  * Physical offset not yet read.

cmdline/state.c

@@ -28,6 +28,7 @@
 #include "io.h"
 #include "raid/raid.h"
 #include "raid/cpu.h"
+#include "mac.h"
 
 /**
  * Configure the multithread support.
@@ -948,7 +949,13 @@ void state_config(struct snapraid_state* state, const char* path, const char* co
 					dev = st.st_dev;
 
 					/* read the uuid, if unsupported use an empty one */
-					if (devuuid(dev, uuid, sizeof(uuid)) != 0) {
+					if (
+#ifdef __APPLE__
+						devuuid_macos(dir, uuid, sizeof(uuid))
+#else
+						devuuid(dev, uuid, sizeof(uuid))
+#endif
+					!= 0) {
 						*uuid = 0;
 					}
 
@@ -1450,7 +1457,11 @@ static void state_map(struct snapraid_state* state)
 				char uuid[UUID_MAX];
 				int ret;
 
+#ifdef __APPLE__
+				ret = devuuid_macos(state->parity[l].split_map[s].path, uuid, sizeof(uuid));
+#else
 				ret = devuuid(state->parity[l].split_map[s].device, uuid, sizeof(uuid));
+#endif
 				if (ret != 0) {
 					/* uuid not available, just ignore */
 					continue;

configure.ac

@@ -241,6 +241,7 @@ AS_CASE([$host],
 	[POSIX=1]
 )
 AM_CONDITIONAL(HAVE_POSIX, [test x"$POSIX" != x])
+AM_CONDITIONAL(HAVE_DISK_ARBITRATION, [test "$(uname)" == Darwin])
 
 AC_ARG_ENABLE([profiler],
 	[AS_HELP_STRING([--enable-profiler],[enable the use of gprof for code coverage])],