Your message dated Wed, 07 Jul 2021 21:57:34 +0200
with message-id <[email protected]>
and subject line Re: Bug#984650: update-initramfs fails when
/etc/systemd/network/99-default.link is symlink to /dev/null
has caused the Debian Bug report #984650,
regarding update-initramfs fails if there is a symlink to /dev/zero in
/etc/systemd/network
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
984650: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984650
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: initramfs-tools
Version: 0.133+deb10u1
Severity: important
When one disables the "Predicatble Network InterfaceNames"
by making /lib/systemd/network/99-default.link a symlink to /dev/zero then
update-initramfs will fail as the copy of this symlink will fill-up all space
available in /var/tmp and makes it impossible to install any kernel image
the culprit is the following command executed by update-initramfs:
find /etc/systemd/network -name *.link -execdir cp -pt /var/tmp/ {} +
As it (and should) dereference de symlink, it reads zero bytes from /dev/null
until the disk is full.
Changing the symlink to a zero byte file resolved the issue for me but as this
approach is one of the recommended approaches to disable predicatble network
interface names (see [1]) others may also bump into this.
[1] https://wiki.debian.org/NetworkInterfaceNames#How_to_get_it_back
-- Package-specific info:
-- initramfs sizes
-rw-r--r-- 1 root root 6.9M Mar 6 14:31 /boot/initrd.img-4.19.0-13-amd64
-rw-r--r-- 1 root root 6.9M Mar 6 14:32 /boot/initrd.img-4.19.0-14-amd64
-- /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.19.0-14-amd64
root=UUID=8d33b150-7c84-4dd0-8893-06eab0e7b9d7 ro quiet
-- resume
RESUME=UUID=2db37a4d-80dd-46b3-aa4d-ff57862589ba
-- /proc/filesystems
ext3
ext2
ext4
-- lsmod
Module Size Used by
vmw_vsock_vmci_transport 32768 1
vsock 40960 2 vmw_vsock_vmci_transport
ata_generic 16384 0
crct10dif_pclmul 16384 0
crc32_pclmul 16384 0
vmwgfx 331776 1
ttm 126976 1 vmwgfx
ghash_clmulni_intel 16384 0
vmw_balloon 20480 0
drm_kms_helper 208896 1 vmwgfx
intel_rapl_perf 16384 0
joydev 24576 0
pcspkr 16384 0
drm 495616 4 vmwgfx,drm_kms_helper,ttm
ahci 40960 0
vmxnet3 69632 0
ata_piix 36864 0
libahci 40960 1 ahci
sg 36864 0
libata 270336 4 ata_piix,libahci,ahci,ata_generic
vmw_vmci 81920 2 vmw_balloon,vmw_vsock_vmci_transport
i2c_piix4 24576 0
ac 16384 0
button 20480 0
ip_tables 28672 0
x_tables 45056 1 ip_tables
autofs4 49152 2
ext4 745472 1
crc16 16384 1 ext4
mbcache 16384 1 ext4
jbd2 122880 1 ext4
crc32c_generic 16384 0
fscrypto 32768 1 ext4
ecb 16384 0
crc32c_intel 24576 2
sd_mod 61440 3
aesni_intel 200704 0
psmouse 172032 0
aes_x86_64 20480 1 aesni_intel
crypto_simd 16384 1 aesni_intel
cryptd 28672 3 crypto_simd,ghash_clmulni_intel,aesni_intel
glue_helper 16384 1 aesni_intel
evdev 28672 2
serio_raw 16384 0
vmw_pvscsi 28672 2
scsi_mod 249856 4 vmw_pvscsi,sd_mod,libata,sg
-- /etc/initramfs-tools/modules
-- /etc/kernel-img.conf
# Kernel image management overrides
# See kernel-img.conf(5) for details
do_symlinks = yes
do_bootloader = no
do_initrd = yes
link_in_boot = no
-- /etc/initramfs-tools/initramfs.conf
MODULES=most
BUSYBOX=auto
KEYMAP=n
COMPRESS=gzip
DEVICE=
NFSROOT=auto
RUNSIZE=10%
-- /etc/initramfs-tools/update-initramfs.conf
update_initramfs=yes
backup_initramfs=no
-- /sys/block
sda
-- mkinitramfs hooks
/etc/initramfs-tools/hooks/:
/usr/share/initramfs-tools/hooks:
dmsetup
fsck
fuse
keymap
klibc-utils
kmod
resume
thermal
udev
zz-busybox
-- System Information:
Debian Release: 10.8
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.19.0-14-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=UTF-8 (charmap=UTF-8) (ignored: LC_ALL set
to en_US.utf8), LANGUAGE=en_US:en (charmap=UTF-8) (ignored: LC_ALL set to
en_US.utf8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages initramfs-tools depends on:
ii initramfs-tools-core 0.133+deb10u1
ii linux-base 4.6
initramfs-tools recommends no packages.
Versions of packages initramfs-tools suggests:
ii bash-completion 1:2.8-6
-- no debconf information
--- End Message ---
--- Begin Message ---
Hi Frederik
On Tue, 16 Mar 2021 19:42:48 +0100 Michael Biebl <[email protected]> wrote:
>
> On Sat, 6 Mar 2021 17:22:17 +0100 Frederik Lindenaar
> <[email protected]> wrote:
> > Why not use a cp -aLt <directory> {} instead to prevent this?
> >
>
> This wouldn't produce the right result afaics. If you mask a file by
> symlinking it to /dev/null, the current code produces a file with zero-
> size (which is also acceptable for masking files).
>
> If you dereference (-L), you instead copy a character device, which is
> not the same as a zero-sized file.
>
> We also have to keep in mind, that if a .link file in
> /etc/system/network, pointing to some link elsewhere, we probably do
> want to resolve that and not copy a dangling symlink.
>
> The current code is already ugly as it is. I'm not sure, adding more
> corner cases is a good idea. That said, I'm open to suggestions. The
> code must
>
> - make sure files with the same name in /etc/systemd/network take
> precedence of files in /lib/systemd/network
> - correctly handle masked .link files (i.e. files pointing at
> /dev/null)
> - correctly handle the case that /etc/systemd/network doesn't exist or
> itself is a symlink
>
> I'm happy to take a patch for that.
No such patch was provided, so I'm closing this bug report at this point.
I'm fine with this bug being reopened if someone has interest in this and
produces a patch / MR.
Regards,
Michael
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