depot/third_party/nixpkgs/pkgs/tools/filesystems/bcache-tools/bcache-udev-modern.patch

This patch does two things:
1) Drops probe-bcache, so now util-linux detecting functionality is used.
2) Drops bcache-register, moving registering device functionality into rule
   using 'sh'.
This reduces things that need to be present in initrd, replacing them with
already existing functionality and reducing overall initrd size.

diff --git a/69-bcache.rules b/69-bcache.rules
index 9cc7f0d..6a52893 100644
--- a/69-bcache.rules
+++ b/69-bcache.rules
@@ -10,16 +10,11 @@ KERNEL=="fd*|sr*", GOTO="bcache_end"
 # It recognised bcache (util-linux 2.24+)
 ENV{ID_FS_TYPE}=="bcache", GOTO="bcache_backing_found"
 # It recognised something else; bail
-ENV{ID_FS_TYPE}=="?*", GOTO="bcache_backing_end"
-
-# Backing devices: scan, symlink, register
-IMPORT{program}="probe-bcache -o udev $tempnode"
-ENV{ID_FS_TYPE}!="bcache", GOTO="bcache_backing_end"
-ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
+GOTO="bcache_backing_end"
 
 LABEL="bcache_backing_found"
 RUN{builtin}+="kmod load bcache"
-RUN+="bcache-register $tempnode"
+RUN+="@shell@ -c 'echo $tempnode > /sys/fs/bcache/register_quiet'"
 LABEL="bcache_backing_end"
 
 # Cached devices: symlink
diff --git a/Makefile b/Makefile
index c824ae3..c5f7309 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,6 @@ all: make-bcache probe-bcache bcache-super-show bcache-register
 
 install: make-bcache probe-bcache bcache-super-show
 	$(INSTALL) -m0755 make-bcache bcache-super-show	$(DESTDIR)${PREFIX}/sbin/
-	$(INSTALL) -m0755 probe-bcache bcache-register		$(DESTDIR)$(UDEVLIBDIR)/
 	$(INSTALL) -m0644 69-bcache.rules	$(DESTDIR)$(UDEVLIBDIR)/rules.d/
 	$(INSTALL) -m0644 -- *.8 $(DESTDIR)${PREFIX}/share/man/man8/
 	$(INSTALL) -D -m0755 initramfs/hook	$(DESTDIR)/usr/share/initramfs-tools/hooks/bcache