eudev doesn't work, /dev not populated about eudev HOT 37 CLOSED

The problem is most likely that we are missing rules that are needed for proper module loading without kmod. A solution is in the kmod branch. It will be merged after proper review.

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@fluxer This issue should be fixed in HEAD. Please let me know if you are still having this problem.

from eudev.

Still no joy. Executing from the initramfs

udevd --daemon --debug

tells me that /etc/udev/hwdb.bin is missing.

from eudev.

Thanks for the report! What's going on here is that the hwdb files are being installed into

 udevhwdbdir = $(udevlibexecdir)/hwdb.d

where this is substituted at configure time

udevlibexecdir=@udevlibexecdir@

but, udevadm-hwdb.c is hard coded to look in /etc/udev/hwdb.bin. systemd upstream has already fixed this by adding another AM_CPPFLAGS -DHWDB_BIN=hwdb_bin where the later is still hard set to hwdb_bin=/etc/udev/hwdb.bin, only now in their Makefile.am rather than their c code.

I don't completely like this solution since it disconnects hwdb_bin from a configurable directory which is substituted at configure time. I will half adopt their solution.

from eudev.

On Fri, Nov 23, 2012 at 5:38 PM, blueness [email protected] wrote:

Thanks for the report! What's going on here is that the hwdb files are being installed into

udevhwdbdir = $(udevlibexecdir)/hwdb.d

where

rootprefix=@rootprefix@
udevlibexecdir=@udevlibexecdir@

but, udevadm-hwdb.c is hard coded to look in /etc/udev/hwdb.bin. systemd upstream has already fixed this by adding another AM_CPPFLAGS -DHWDB_BIN=hwdb_bin where the later is still hard set to hwdb_bin=/etc/udev/hwdb.bin, only now in their Makefile.am rather than their c code.

I wonder why he isn't defining it in config.h though, exporting it
using AC_DEFINE_UNQUOTED...

lu

from eudev.

Luca, look at my commit in

https://github.com/gentoo/eudev/commit/e5cc2b881fd1db175b0d80bcccf21ae70857a532

My next step will be to add -DHWDB_BIN=@udevhwdbdir@ and replace the hard coded patch in the code. I think my approach will make it a lot easier to control paths to various components in the future via substitution variables.

from eudev.

On Fri, Nov 23, 2012 at 7:59 PM, blueness [email protected] wrote:

Luca, look at my commit in

e5cc2b8

From what I can see you should have the make vars already defined by
autoconf no need to redo that.

My next step will be to add -DHWDB_BIN=@udevhwdbdir@ and replace the hard coded patch in the code. I think my approach will make it a lot easier to control paths to various components in the future via substitution variables.

Use AC_DEFINE_UNQUOTED instead.

lu

from eudev.

Yeah I can use AC_DEFINE_UNQUOTED, thanks.

from eudev.

I was not able to use AC_DEFINE* because AC_ARG_WITH does not set up a template in config.h.in like AC_CHECK_* does, so I reverted to using AM_CPPFLAGS as we've been doing up til now --- upstream and ryao did it this way.

@fluxer, /sbin/udevadm hwdb --update should now create /etc/udev/hwdb.bin, or wherever you configure it. It'll always be in the same directory as udev.conf. You may still bump up against issue #18, but at least udevd --daemon --debug should find the file.

Thanks! and please be patient since the pieces are just now starting to come together.

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@fluxer I appear to have had some old rules on my system that messed up my testing. 2718feb should fix your issue.

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I gave it a whirl just now, it still doesn't work and still leaves me in initramfs. I changed the initramfs hook to include /etc/udev/hwdb.bin but that doesn't seem to help. And again, I did tried this from the initramfs:

udevd --daemon --debug
udevadm hwdb --update
udevadm trigger
udevadm settle

where the trigger trow a lot of output this time, something that didn't happened before and makes me thing you've made some progress. I will give it another try later on, just let me know.

from eudev.

@fluxer Is there any possibility that Arch Linux uses custom udev rules? It might be worthwhile doing a diff between the rules provided by eudev and the rules provided by Arch Linux's systemd package.

from eudev.

I've tried that before, look at my first comment:

Since I was using the udev-fork of braindamaged and it worked for me I tried to use the rules from it and copied them over those that eudev provided, that didn't helped either.

from eudev.

Just to do a bit of a run-down on the install process, based on what's done in gentoo:

1. The usual ./configure [options] && make && make install
2. if the *.hwdb files are not installed/not part of the checkout (and we're going to remove them soon if they haven't been already), get them from https://github.com/gentoo/hwids (or from systemd) (gentoo packages them externally)
3. use 'udevadm --trigger' to create the /etc/udev/hwdb.bin file from the *.hwdb files
4. If using eudev inside an initramfs, rebuild the initramfs (including the hwdb.bin)
5. restart udevd and/or reboot

So if the above matches what you're doing, and it's failing to boot, then if you could provide us with some of that debug output we'd appreciate it -- I'm curious to see what's going on.

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1. check!
2. check! I use hwids package which paths I'm specifying in the configure step - /lib/hwdata/{pci,usb}.ids
3. blueness already pointed me to the right direction about that - udevadm hwdb --update, '--trigger' is not valid :)
4. check!
5. check! After I'm left in initramfs I tried all of the above and it still doesn't makes the nodes.

Here are screenshots of the output of 'udevd --daemon --debug':
http://img834.imageshack.us/img834/1125/udevd1.png
http://img542.imageshack.us/img542/5936/udevd2.png

Compiled today from master, using untouched rules provided by eudev, if the 'udevadm trigger' is important too I will have to make a few more screenshots or if you tell me how to make the nodes manually for my disks (IDE) I can dump it on it and upload it.

from eudev.

Hello, I have the same problem with default kernel. My logs (catched by bootlogd):

eudev-git 20130121: http://pastebin.com/mk9a3VGu
eudev-git 20130121 (with included /etc/udev/hwdb.bin): http://pastebin.com/qze3qQfh
systemd 196: http://pastebin.com/Sq080jtf

BTW if look into last log, you'll see that systemd-udev misses hwdb file too but works as expected. Maybe the problem is not here?

from eudev.

@fluxer , try rebuild eudev with --enable-libkmod.

from eudev.

Nope, didn't worked either. I noticed that

--with-usb-ids-path=/lib/hwdata/usb.ids 
--with-pci-ids-path=/lib/hwdata/pci.ids 
--enable-rule_generator

are not valid configure options, could it be that there is something missing in the configure script?

I'm using the following commands to compile it:

./autogen.sh
./configure --prefix=/usr \
            --sysconfdir=/etc \
            --bindir=/sbin \
            --libexecdir=/lib \
            --with-firmware-path=/usr/lib/firmware/updates:/lib/firmware/updates:/usr/lib/firmware:/lib/firmware \
            --with-usb-ids-path=/lib/hwdata/usb.ids \
            --with-pci-ids-path=/lib/hwdata/pci.ids \
            --enable-rule_generator \
            --disable-introspection \
            --disable-gudev \
            --disable-manpages \
            --enable-libkmod
make

Edit: Two more things

1. I'm no longer running and testing this on Arch Linux, rather something ala LFS with Pacman. I will change the issue title
2. I'm using hwids dating from 20121226. I will update my package and see what happens.

from eudev.

That is correct. The build system doesn't actually do anything with the *.ids files. You can just copy them directly to /etc/udev/hwdb.d/ or /lib/udev/hwdb.d (or alternatively, make /lib/udev/hwdb.d be a symlink to where they are actually installed), and then run udevadm hwdb --update to generate the "hwdb.bin" file.

from eudev.

also, --enable-rule-generator should have no effect on this, as all it does is install the helper scripts and the 75-persistent-*-generator.rules as per udev-171 and older. (also, you need to checkout the rule-generator branch to obtain the code for this)

from eudev.

Just to confirm -- your kernels do have CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT enabled, correct?

from eudev.

Tried to link the hwids files to /lib/udev/hwdb.d and still the same, hwdb.bin updated and included in the initramfs.

And about CONFIG_DEVTMPFS and CONFIG_DEVTMPFS_MOUNT - yes, both are built-in into the kernel. The kernel is 3.4.23 from Zen sources.

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If you have /dev line in /etc/fstab, make sure it says devtmpfs as filesystem and nothing else -- this would prevent the /dev population if it's wrongly set.

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Pseudo filesystems mounted as follows:

mount -t proc proc /proc -o nosuid,noexec,nodev
mount -t sysfs sys /sys -o nosuid,noexec,nodev
mount -t devtmpfs dev /dev -o mode=0755,nosuid
mount -t tmpfs run /run -o nosuid,nodev,mode=0755

After discussion with Ian he came to the conclusion that this a problem with the combination of kmod and eudev which I'm using. It seems that the necessary modules to access the real filesystems are not loaded.

from eudev.

this a problem with the combination of kmod and eudev which I'm using

Are you sure that have modules loading support enabled (--enable-modules)? I just want to notice you that it's disabled by default.

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I was running into big issues with eudev on Archlinux myself and I just got it working with runit-musl+ignite instead of systemd.

Thanks the TZ86's comment I added --enable-modules and it works now! This is my configure line (prefix is for testing):

./configure --prefix=/usr/local/eudev --enable-modules --enable-libkmod

However, there's a big problem with ./configure --help output:

--disable-modules Disable loadable module support [default=enabled]

That is CLEARLY not the case! The default is disabled, not enabled.

So far so good. I will put up a AUR build so that more Arch users can try this out tomorrow.

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I tried to compile it with '--enable-modules' and nothing changed. Here is what ldd says:

ldd /sbin/udevadm 
linux-vdso.so.1 (0x00007fffbb7ff000)
libudev.so.1 => /lib/libudev.so.1 (0x00007fc581e71000)
libblkid.so.1 => /lib/libblkid.so.1 (0x00007fc581c3d000)
libkmod.so.2 => /lib/libkmod.so.2 (0x00007fc581a28000)
librt.so.1 => /lib/librt.so.1 (0x00007fc581820000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007fc581604000)
libc.so.6 => /lib/libc.so.6 (0x00007fc581260000)
libm.so.6 => /lib/libm.so.6 (0x00007fc580f66000)
/lib64/ld-linux-x86-64.so.2 (0x00007fc5820ac000)
libuuid.so.1 => /lib/libuuid.so.1 (0x00007fc580d61000)
liblzma.so.5 => /lib/liblzma.so.5 (0x00007fc580b3e000)
libz.so.1 => /lib/libz.so.1 (0x00007fc580928000)

ldd /sbin/udevd   
linux-vdso.so.1 (0x00007fff1adff000)
libudev.so.1 => /lib/libudev.so.1 (0x00007fa1709fc000)
libblkid.so.1 => /lib/libblkid.so.1 (0x00007fa1707c8000)
libkmod.so.2 => /lib/libkmod.so.2 (0x00007fa1705b3000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007fa170397000)
libc.so.6 => /lib/libc.so.6 (0x00007fa16fff3000)
libm.so.6 => /lib/libm.so.6 (0x00007fa16fcf9000)
librt.so.1 => /lib/librt.so.1 (0x00007fa16faf1000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa170c37000)
libuuid.so.1 => /lib/libuuid.so.1 (0x00007fa16f8ec000)
liblzma.so.5 => /lib/liblzma.so.5 (0x00007fa16f6c9000)
libz.so.1 => /lib/libz.so.1 (0x00007fa16f4b3000)

from eudev.

I tried to compile it with '--enable-modules' and nothing changed

Strange, it works for me. Do you update initramfs image?

from eudev.

I did, I'm rebuilding it everytime.

It seems that it works now after adding all of the eudev rules into the initramfs, eudev compiled with '--enable-modules' and '--enable-libkmod'. I've tried that before except that eudev was not compiled with that options and it didn't worked. I guess that those configure options should be set to enabled by default?

from eudev.

This is probably a documentation issue, more than anything. At this time, --enable-modules is required for -all- module load support (that is, --disable-modules drops all module loading support). --enable-libkmod , on the other hand, enables build-time internal libkmod-based module loading.

We'll make sure to properly document the flags in the future and probably we'll also swap the default so that "modules" is enabled.

Are we at a point now where this issue can be closed?

(oops - didn't mean to actually close this issue, yet)

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I think the issue should stay open until the proper defaults are set in the configure script. Other than that I'm trough it.

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Or at least make sure to open a new documentation bug and fix the configure outputs :) But its good for me too.

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I agree with fluxer and vostok4. Not ready to be closed, but getting there!

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so --enable-modules was supposed to be on by default, but the AC_ARG_ENABLE command for it in configure was incomplete. Fixed in commit 0407037

(this should bring an eudev default build a lot closer to expected behaviour, if not resolve the issue completely)

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this should bring an eudev default build a lot closer to expected behaviour, if not resolve the issue completely

Yep, now it works perfectly even without --enable-libkmod and --enable-modules. Thanks!

@fluxer, I think the issue may be closed now.

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@TZ86: Good.

@ALL: Thank you for your time.

from eudev.

as per comments above, the now properly-implemented defaults seem to have sorted this issue. Closing again

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