UUID support has made it upstream after 1.14.2 was
released. I'm attaching a backport to 1.14.2.
Build-tested, not runtime-tested.
Max
Index: trunk/debian/config/udeb
===================================================================
--- trunk/debian/config/udeb (revision 59555)
+++ trunk/debian/config/udeb (working copy)
@@ -497,6 +497,7 @@
# CONFIG_FEATURE_MDEV_EXEC is not set
# CONFIG_FEATURE_MDEV_LOAD_FIRMWARE is not set
CONFIG_MKSWAP=y
+CONFIG_FEATURE_MKSWAP_UUID=y
# CONFIG_FEATURE_MKSWAP_V0 is not set
CONFIG_MORE=y
CONFIG_FEATURE_USE_TERMIOS=y
Index: trunk/debian/config/static
===================================================================
--- trunk/debian/config/static (revision 59555)
+++ trunk/debian/config/static (working copy)
@@ -501,6 +501,7 @@
# CONFIG_FEATURE_MDEV_EXEC is not set
# CONFIG_FEATURE_MDEV_LOAD_FIRMWARE is not set
CONFIG_MKSWAP=y
+# CONFIG_FEATURE_MKSWAP_UUID is not set
# CONFIG_FEATURE_MKSWAP_V0 is not set
CONFIG_MORE=y
CONFIG_FEATURE_USE_TERMIOS=y
Index: trunk/debian/config/deb
===================================================================
--- trunk/debian/config/deb (revision 59555)
+++ trunk/debian/config/deb (working copy)
@@ -497,6 +497,7 @@
# CONFIG_FEATURE_MDEV_EXEC is not set
# CONFIG_FEATURE_MDEV_LOAD_FIRMWARE is not set
# CONFIG_MKSWAP is not set
+# CONFIG_FEATURE_MKSWAP_UUID is not set
# CONFIG_FEATURE_MKSWAP_V0 is not set
CONFIG_MORE=y
CONFIG_FEATURE_USE_TERMIOS=y
Index: trunk/debian/patches/mkswap-uuid.patch
===================================================================
--- trunk/debian/patches/mkswap-uuid.patch (revision 0)
+++ trunk/debian/patches/mkswap-uuid.patch (revision 0)
@@ -0,0 +1,138 @@
+Backport of mkswap UUID support to 1.14.2
+
+This combines the following upstream commits:
+
+ e25ba804dd38009f7b7df6b6efd7e1847e4242fa mkswap: separate UUID feature
+ ae5e96ad6900a287b0c18e3e6713769cead8dd71 mkswap: accidentally committed wrong
+ a262cddae85667b1c073b35c3d000ae7f4a44b31 mkswap: improve randomness of UUID ge
+ f7ac66b55ffd036d9590f180149b6b7bb85a2d1b mkswap: generate UUID if CONFIG_DESKT
+
+diff --git a/util-linux/Config.in b/util-linux/Config.in
+index e5c053f..e7b0ec7 100644
+--- a/util-linux/Config.in
++++ b/util-linux/Config.in
+@@ -409,6 +409,13 @@ config FEATURE_MKSWAP_V0
+ If your kernel is older than 2.1.117, then v0 support is the
+ only option.
+
++config FEATURE_MKSWAP_UUID
++ bool "UUID support"
++ default n
++ depends on MKSWAP
++ help
++ Generate swap spaces with universally unique identifiers.
++
+ config MORE
+ bool "more"
+ default n
+diff --git a/util-linux/mkswap.c b/util-linux/mkswap.c
+index 11c411b..f718843 100644
+--- a/util-linux/mkswap.c
++++ b/util-linux/mkswap.c
+@@ -5,7 +5,6 @@
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ */
+-
+ #include "libbb.h"
+
+ #if ENABLE_SELINUX
+@@ -48,7 +47,85 @@ static void mkswap_selinux_setcontext(int fd, const char *path)
+ bb_perror_msg_and_die("SELinux relabeling failed");
+ }
+ #else
+-#define mkswap_selinux_setcontext(fd, path) ((void)0)
++# define mkswap_selinux_setcontext(fd, path) ((void)0)
++#endif
++
++#if ENABLE_FEATURE_MKSWAP_UUID
++static void mkswap_generate_uuid(uint8_t *buf)
++{
++ /* http://www.ietf.org/rfc/rfc4122.txt
++ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
++ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
++ * | time_low |
++ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
++ * | time_mid | time_hi_and_version |
++ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
++ * |clk_seq_and_variant | node (0-1) |
++ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
++ * | node (2-5) |
++ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
++ * IOW, uuid has this layout:
++ * uint32_t time_low (big endian)
++ * uint16_t time_mid (big endian)
++ * uint16_t time_hi_and_version (big endian)
++ * version is a 4-bit field:
++ * 1 Time-based
++ * 2 DCE Security, with embedded POSIX UIDs
++ * 3 Name-based (MD5)
++ * 4 Randomly generated
++ * 5 Name-based (SHA-1)
++ * uint16_t clk_seq_and_variant (big endian)
++ * variant is a 3-bit field:
++ * 0xx Reserved, NCS backward compatibility
++ * 10x The variant specified in rfc4122
++ * 110 Reserved, Microsoft backward compatibility
++ * 111 Reserved for future definition
++ * uint8_t node[6]
++ *
++ * For version 4, these bits are set/cleared:
++ * time_hi_and_version & 0x0fff | 0x4000
++ * clk_seq_and_variant & 0x3fff | 0x8000
++ */
++ pid_t pid;
++ int i;
++ char uuid_string[32];
++
++ i = open("/dev/urandom", O_RDONLY);
++ if (i >= 0) {
++ read(i, buf, 16);
++ close(i);
++ }
++ /* Paranoia. /dev/urandom may be missing.
++ * rand() is guaranteed to generate at least [0, 2^15) range,
++ * but lowest bits in some libc are not so "random". */
++ srand(monotonic_us());
++ pid = getpid();
++ while (1) {
++ for (i = 0; i < 16; i++)
++ buf[i] ^= rand() >> 5;
++ if (pid == 0)
++ break;
++ srand(pid);
++ pid = 0;
++ }
++
++ /* version = 4 */
++ buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
++ /* variant = 10x */
++ buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
++
++ bin2hex(uuid_string, (void*) buf, 16);
++ /* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */
++ printf("UUID=%.8s" "-%.4s-%.4s-%.4s-%.12s\n",
++ uuid_string,
++ uuid_string+8,
++ uuid_string+8+4,
++ uuid_string+8+4+4,
++ uuid_string+8+4+4+4
++ );
++}
++#else
++# define mkswap_generate_uuid(buf) ((void)0)
+ #endif
+
+ #if 0 /* from Linux 2.6.23 */
+@@ -113,10 +190,10 @@ int mkswap_main(int argc, char **argv)
+ // Make a header. hdr is zero-filled so far...
+ hdr[0] = 1;
+ hdr[1] = (len / pagesize) - 1;
++ mkswap_generate_uuid((void*) &hdr[3]);
+
+ // Write the header. Sync to disk because some kernel versions check
+ // signature on disk (not in cache) during swapon.
+-
+ xlseek(fd, 1024, SEEK_SET);
+ xwrite(fd, hdr, NWORDS * 4);
+ xlseek(fd, pagesize - 10, SEEK_SET);
Index: trunk/debian/patches/series
===================================================================
--- trunk/debian/patches/series (revision 59555)
+++ trunk/debian/patches/series (working copy)
@@ -4,3 +4,4 @@
version.patch
init-console.patch
strip.patch
+mkswap-uuid.patch
Index: trunk/debian/changelog
===================================================================
--- trunk/debian/changelog (revision 59555)
+++ trunk/debian/changelog (working copy)
@@ -7,6 +7,10 @@
[ Otavio Salvador ]
* [udeb] Add an udhcpc script to be used by netcfg.
+ [ Max Vozeler ]
+ * Backport mkswap UUID support. (closes: #531572)
+ * [udeb] Enable mkswap UUID support.
+
-- Otavio Salvador <ota...@ossystems.com.br> Sun, 19 Jul 2009 14:43:18 -0300
busybox (1:1.13.3-1) unstable; urgency=low
