This is from the following thread:
http://thread.gmane.org/gmane.linux.raid/35753/focus=35795
Additional tests + more specific info.
Signed-off-by: Michal Soltys <soltys@ziu.info>
[harald@redhat.com: usable_root(): relaxed check for root]
The "read" shell builtin consumes backslashes, which is a problem if
your root device is something like "LABEL=Fedora\x2016".
Using "read -r" tells the shell to leave backslashes alone.
Whitespace removal in:
out="${out}${chop# }$r"
will damage certain strings, for example the following call:
str_replace ' aax aaxaa' x y
would return 'aayaayaa' instead of ' aay aayaa'.
Signed-off-by: Michal Soltys <soltys@ziu.info>
To not pollute dracut-lib.sh, all the fsck related functions were moved
to fs-lib.sh. The functions available are as follows:
- fsck_single
this will detect/verify filesystem, check if it has necessary tools and
check the filesystem respecting additional flags (if any), using
specific "driver" (or falling back to generic one). Currently
available: fsck_drv_{com,xfs,std}. 'com' is used for tools following
typical subset of options/return codes (e.g. ext, jfs), 'std' is used
for "unknown" fs and doesn't assume it can be run non-interactively.
Please see comments around the code for more info.
- fsck_batch
this will check provided list of the devices;
Both of the above functions will fake empty fstab, to make generic fsck
not complain too much (excact devices are always provided on the command
line).
"Known" filesystems currently: ext234, reiser, jfs, xfs
- det_fs
Small bug fixed - as this function is meant to be called in $(), it may
not be verbose.
Current behaviour is:
- if detection is successful, use its result
- if detection is not successful, and filesystem is provided, return
the provided one; otherwise use auto
if a value of a key on the kernel command line includes wildcards, these
would be expanded.
E.g., if you have "key=/dev/sd*" the value would be substituted with
"/dev/sda /dev/sda1 /dev/sda2" instead of returning "/dev/sd*"
Mount the securityfs filesystem and make available its location through the
exported variable SECURITYFSDIR.
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Acked-by: Gianluca Ramunno <ramunno@polito.it>
Both functions will be used by rootfs-block and fstab-sys modules.
Both are based on code present in mount-root.sh, though few changes are
present.
det_fs:
will try to determine filesystem type for supplied device, even if it's
not auto. If fs cannot be detected, or if the detected one differs from
the supplied one - a warning is issued (so user can fix its stuff later)
wrap_fsck:
will call fsck for specific device with optionally additional
fsckoptions. The function returns fsck return value.
Signed-off-by: Michal Soltys <soltys@ziu.info>
If /proc/cmdline is empty (like if root=... is set in /etc/cmdline),
modules.d/99base/init will crash with a message saying "can't shift that
many" right before switch_root. The problem is in the block of code that
tries to look for init args. It does something like:
read CMDLINE </proc/cmdline
[...]
set $CMDLINE
shift
If CMDLINE="" then "set $CMDLINE" will dump all the variables to stdout.
(That should be "set -- $CMDLINE" instead.) Since there's no $1, the
"shift" causes an error, and dracut crashes.
The 'shift' was copy-and-pasted from the previous block. It doesn't
belong here; remove it.
[Harald Hoyer <harald@redhat.com>: corrected commit message]
[Harald Hoyer <harald@redhat.com>: fixed indention]
Signed-off-by: Will Woods <wwoods@redhat.com>
Given that we boot into a modern Linux distribution with the "/run" toplevel
directory, we can easily mount move the whole /run directory to the real
root in the end and have the complete initramfs later on in
/run/initramfs. All log files and /run states are still accessible and
to save space /run/initramfs can be removed later on.
Because the kernel does not mount a tmpfs on /run prior to unpacking the
initramfs cpio image, we have to copy ourselves very early to a tmpfs
and mount it on /run.
Due to lazy umount the old initramfs binaries should
be removed in the end by switch_root.
This feature can be turned on with "--prefix".
This adds the following parameters:
rd.caps=1
turn the caps module on/off
rd.caps.initdrop=cap_sys_module,cap_sys_rawio
drop the specified comma seperated capabilities
rd.caps.disablemodules=1
turn off module loading
rd.caps.disablekexec=1
turn off the kexec functionality
If module loading is turned off, all modules have to be loaded in the
initramfs, which are used later on. This can be done with
"rd.driver.pre="
rd.driver.pre=autofs4,sunrpc,ipt_REJECT,nf_conntrack_ipv4,....
Because the kernel command line would get huge with all those drivers, I
recommend to make use of $initramfs/etc/cmdline.
So, all rd.caps.* and rd.driver.pre arguments are in caps.conf can be
copied to $initramfs/etc/cmdline with "-i caps.conf /etc/cmdline".
Also all modules have to be loaded in the initramfs via "--add-drivers".
The resulting initramfs creation would look like this:
--add-drivers "autofs4 sunrpc ipt_REJECT nf_conntrack_ipv4 \
nf_defrag_ipv4 iptable_filter ip_tables
ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack
ip6table_filter ip6_tables dm_mirror dm_region_hash dm_log uinput ppdev
parport_pc parport ipv6 sg 8139too 8139cp mii i2c_piix4 i2c_core ext3
jbd mbcache sd_mod crc_t10dif sr_mod cdrom ata_generic pata_acpi ata_piix
dm_mod" \
/boot/initramfs-caps.img
We want all "/var/run" information to live in /dev/.run, until the real
root is mounted.
Therefore we mount a tmpfs on /dev/.run, which can/will be bind/move mounted
on /var/run later on.
New:
str_starts, str_replace
funiq - print new unique file name
mkuniqdir - create and print new unique dir
splitsep - splits given string 'str' with separator 'sep' into vars
udevmatch - create udev rule match for a device
Modified:
foreach_uuid_until - use $___ as a place holder
Let take a look at Linux sources, /usr/src/linux-2.6.35/init/main.c:
204: char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
857: run_init_process("/sbin/init");
817: static void run_init_process(char *init_filename)
818: {
819: argv_init[0] = init_filename;
820: kernel_execve(init_filename, argv_init, envp_init);
821: }
As we can see HOME=/ and TERM=linux are provided for init and this might be
expected on some systems (Gentoo comes to my mind, here ;-)). That's why we
should give to init the same set of env. vars as Linux kernel does.
set $RDTIMESTAMP for init, if rd.timestamp is specified on the
kernel command line, so that systemd can print out:
"systemd: Boot finished after 15s = 3s (kernel) + 2s (initrd) + 10s
(userspace)"
Instead of adding modprobe and rmmod, create symlinks to /bin/true to
don't produce unnecessary errors. Anyway it's a workaround for
following desired behaviour: modprobe tries to insert module only if
it's not built into kernel
Common wisdom to enter single user on Linux is to edit command
line and add "single". This was not possible because switch_root
was always called with empty init arguments. Collect them from
command line and pass to real init when switching root.
Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Daniel Drake