Re: [PATCH 2/2] Use libudev's enumerate_devices function (#559394)

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Updated patch:

diff --git a/baseudev.py b/baseudev.py
index 0eb66b8..5ba1011 100644
- --- a/baseudev.py
+++ b/baseudev.py
@@ -31,29 +31,19 @@ import logging
 log = logging.getLogger("storage")

 def udev_enumerate_devices(deviceClass="block"):
- -    top_dir = "/sys/class/%s" % deviceClass
- -    devices = []
- -    for dev_name in os.listdir(top_dir):
- -        full_path = os.path.join(top_dir, dev_name)
- -        link_ref = os.readlink(full_path)
- -        real_path = os.path.join(top_dir, link_ref)
- -        sysfs_path = os.path.normpath(real_path)
- -        devices.append(sysfs_path[4:])
- -    return devices
+    return global_udev.enumerate_devices(subsystem=deviceClass)

 def udev_get_device(sysfs_path):
- -    if not os.path.exists("/sys%s" % sysfs_path):
+    if not os.path.exists(sysfs_path):
         log.debug("%s does not exist" % sysfs_path)
         return None

- -    # XXX we remove the /sys part when enumerating devices,
- -    # so we have to prepend it when creating the device
- -    dev = global_udev.create_device("/sys" + sysfs_path)
+    dev = global_udev.create_device(sysfs_path)

     if dev:
         dev["name"] = dev.sysname
         dev["symlinks"] = dev["DEVLINKS"]
- -        dev["sysfs_path"] = sysfs_path
+        dev["sysfs_path"] = sysfs_path[4:]


On Thu, 28 Jan 2010, David Lehman wrote:

On Thu, 2010-01-28 at 13:31 -1000, David Cantrell wrote:
From: Martin Gracik <mgracik@xxxxxxxxxx>

Do not list the directories in sys, but use the libudev's
enumerate_devices function to get the sysfs paths.  Run /sbin/udevadm
rather than just udevadm to ensure baseudev.py in an updates.img works.
---
 baseudev.py |   20 +++++---------------
 1 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/baseudev.py b/baseudev.py
index 0eb66b8..8a23825 100644
--- a/baseudev.py
+++ b/baseudev.py
@@ -31,24 +31,14 @@ import logging
 log = logging.getLogger("storage")

 def udev_enumerate_devices(deviceClass="block"):
-    top_dir = "/sys/class/%s" % deviceClass
-    devices = []
-    for dev_name in os.listdir(top_dir):
-        full_path = os.path.join(top_dir, dev_name)
-        link_ref = os.readlink(full_path)
-        real_path = os.path.join(top_dir, link_ref)
-        sysfs_path = os.path.normpath(real_path)
-        devices.append(sysfs_path[4:])
-    return devices
+    return global_udev.enumerate_devices(subsystem=deviceClass)

This part looks great.


 def udev_get_device(sysfs_path):
-    if not os.path.exists("/sys%s" % sysfs_path):
+    if not os.path.exists(sysfs_path):
         log.debug("%s does not exist" % sysfs_path)
         return None

-    # XXX we remove the /sys part when enumerating devices,
-    # so we have to prepend it when creating the device
-    dev = global_udev.create_device("/sys" + sysfs_path)
+    dev = global_udev.create_device(sysfs_path)

     if dev:
         dev["name"] = dev.sysname

This is going to cause lots of problems. You're changing the
'sysfs_path' value in the info dict to include the '/sys' prefix, which
is not what is expected by the devicetree and devices modules. Stuff
like this is all over the place:

storage/devicetree.py:1314: _p = "/sys/%s/%s" % (sysfs_path, protected)

So you'll want to hack it off when setting dev['sysfs_path'].

@@ -90,11 +80,11 @@ def udev_settle():
     # lots of disks, or with slow disks
     argv = ["settle", "--timeout=300"]

-    iutil.execWithRedirect("udevadm", argv, stderr="/dev/null")
+    iutil.execWithRedirect("/sbin/udevadm", argv, stderr="/dev/null")

 def udev_trigger(subsystem=None, action="add"):
     argv = ["trigger", "--action=%s" % action]
     if subsystem:
         argv.append("--subsystem-match=%s" % subsystem)

-    iutil.execWithRedirect("udevadm", argv, stderr="/dev/null")
+    iutil.execWithRedirect("/sbin/udevadm", argv, stderr="/dev/null")


Why are these necessary? Is there also a /usr/bin/udevadm somewhere? We
want the benefit of $PATH so we don't have to change our code if
something moves in the udev packaging.

Dave


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- -- David Cantrell <dcantrell@xxxxxxxxxx>
Red Hat / Honolulu, HI

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