[PATCH] udev: persistent FireWire device names

[Clemens Ladisch <clemens@ladisch.de>]

---
 Makefile.am                        |    1 +
 rules/60-persistent-firewire.rules |   26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 3b7ec0b..415fae6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1510,6 +1510,7 @@ dist_udevrules_DATA += \
 	rules/60-persistent-input.rules \
 	rules/60-persistent-alsa.rules \
 	rules/60-persistent-storage.rules \
+	rules/60-persistent-firewire.rules \
 	rules/75-net-description.rules \
 	rules/75-tty-description.rules \
 	rules/78-sound-card.rules \
diff --git a/rules/60-persistent-firewire.rules b/rules/60-persistent-firewire.rules
new file mode 100644
index 0000000..2eb8cfe
--- /dev/null
+++ b/rules/60-persistent-firewire.rules
@@ -0,0 +1,26 @@
+# do not edit this file, it will be overwritten on update
+
+ACTION="remove", GOTO="persistent_firewire_end"
+SUBSYSTEM!="firewire", GOTO="persistent_firewire_end"
+
+ATTR{is_local}="1", OPTIONS="link_priority=1"
+
+TEST="guid", SYMLINK+="firewire/by-id/guid-$attr{guid}"
+
+# Most devices have the model name in the root directory.
+TEST="vendor_name", TEST="model_name", \
+	OPTIONS="string_escape=replace", \
+	SYMLINK+="firewire/by-name/$attr{vendor_name} $attr{model_name}"
+# Some devices have the model name only in the first unit directory, so we have
+# to get the name from the corresponding subdevice.  (The detour through cat is
+# necessary because $attr does not allow substitutions in its file name.)
+TEST="vendor_name", TEST!="model_name", TEST="$kernel.0/model_name", \
+	PROGRAM="/bin/cat $sys$devpath/$kernel.0/model_name", \
+	OPTIONS="string_escape=replace", \
+	SYMLINK+="firewire/by-name/$attr{vendor_name} $result"
+# To make the preceding rule work when the subdevice is added after the parent
+# device, force a 'change' event to rerun that rule in this case.
+ACTION="add", DEVPATH="*/fw[0-9]*/fw[0-9]*.0", TEST="model_name", TEST!="../model_name", \
+	ATTR{../uevent}="change"
+
+LABEL="persistent_firewire_end"