Karel Zak [Wed, 28 Jun 2017 10:08:25 +0000 (12:08 +0200)]
wipefs: try another magic strings on -o and -t
The commit 92296e9ba2bf95259520fa7537ff8edc2aa9edbc introduces "try
all permutations for the same superblock". This feature has to be also
available if -o and -t is specified.
Karel Zak [Fri, 26 May 2017 11:11:37 +0000 (13:11 +0200)]
wipefs: print all signature permutations
The same FS/RAID/PT signature may be detected by more ways and on more
places on the device. The libblkid returns only the first detected
signature by default. This patch use blkid_probe_hide_range() to
re-scan device for all possible permutations of the same signature.
For example the default wipefs(8) output as well as --no-act output will
contains primary as well as backup GPT signature now.
Reported-by: Ruediger Meier <sweet_f_a@gmx.de> Signed-off-by: Karel Zak <kzak@redhat.com>
Karel Zak [Fri, 26 May 2017 10:58:09 +0000 (12:58 +0200)]
libblkid: allow to hide already detected signatures
The libblkid probing functions returns the first successful result of
the filesystem/RAID/PT. Unfortunately, some signatures is possible to
detect by more ways or device may contains more copies (e.g. GPT).
This is no problem when we wipe signatures from the device. In this
case we zeroize on-device signature and re-scan for the signature (by
blkid_probe_step_back()).
The problem is if we want to read all permutations without the device
modification (for example wipefs(8) dry run).
This patch add blkid_probe_hide_range(). The function remove (zeroize)
specified signature from in-memory cached buffers. If the buffer is
later re-used by probing functions then the signature is invisible and
we can try detect another variant of the magic string.
setpriv: support modifying the set of ambient capabilities
Right now, we do not support modifying the set of ambient capabilities,
which has been introduced quite recently with Linux 4.3. As libcap-ng
does not yet provide any ability to modify this set, we do have to roll
our own support via `prctl`, which is now easy to do due to the
indirections introduced in the preceding commits. We add a new command
line argument "--ambient-caps", which uses the same syntax as both
"--inh-caps" and "--bounding-set" to specify either adding or dropping
capabilities.
This commit also adjusts documentation to mention the newly introduced
ability to modify the ambient capability set.
Based on a patch by Andy Lutomirski.
Reviewed-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Patrick Steinhardt <ps@pks.im>
Our code dumping owned capabilities does not yet handle ambient
capabilities, which were only recently introduced with Linux 4.3. This
commit implements printing ambient capabilities if they're supported by
the system.
Based on a patch by Andy Lutomirski.
Reviewed-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Patrick Steinhardt <ps@pks.im>
libcap-ng provides a function to update capabilities with
`capng_update`. As libcap-ng has not yet been updated to enable
modification of ambient capabilities, we cannot use it to update this
set, though. In order to allow easily extending the logic to also handle
ambient capability sets, we create a new function `cap_update`. Right
now, it simply calls out to `capng_update` for all supported capability
types.
Reviewed-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Patrick Steinhardt <ps@pks.im>
setpriv: proxy function checking whether a capability is set
The loop in `print_caps` iterates over every capability, checks whether
it is set and, if so, prints out its name. Currently, the checking and
printing is rather intertwined, making it harder to extend the check
whether we own a capability.
Prepare code for the introduction of ambient capabilities by
disentangling the code checking for a capability and printing code. A
new function `has_cap` is introduced and `print_caps` will now simply
call out to it and only handle printing itself. This easily allows to
extend the capability check based on which capability set is queried.
Reviewed-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Patrick Steinhardt <ps@pks.im>
setpriv: introduce indirection for `capng_type` enum
The capng_type is used to distinguish the different types of capability
sets, that is the effective, inheratibale, permitted capabilities as
well as the capability bounding set. In Linux 4.3, a new set of
capabilities was introduced with ambient capabilities. Unfortunately,
libcap-ng does not provide any support for these kind of capabilities
and as such, we will have to roll our own support.
As a first step, we introduce an indirection for the `capng_type` enum,
allowing us to add the ambient capability type later on. Right now, no
functional change is expected from this change and in fact, each of the
newly introduce enums should have the same value as respective enum of
libcap-ng.
Reviewed-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Patrick Steinhardt <ps@pks.im>
Karel Zak [Tue, 27 Jun 2017 12:14:14 +0000 (14:14 +0200)]
Merge branch 'help-description' of https://github.com/rudimeier/util-linux
* 'help-description' of https://github.com/rudimeier/util-linux:
misc: update --help content again
login: add --help text
blockdev: improve --help and man page
misc: consolidate all --help option descriptions
misc: introduce print_usage_help_options()
misc: revert to the old USAGE_HELP strings
Ruediger Meier [Sun, 25 Jun 2017 20:01:12 +0000 (22:01 +0200)]
misc: update --help content again
We change
-h, --help display this help and exit
-V, --version output version information and exit
to
-h, --help display this help
-V, --version print version
Some thoughts about this:
* use "display" for --help because it matches better if we
would add pager support (like git --help)
* "print" for --version to be different
* "this" for --help is important to make clear that running
--help would not give you any better information than the
one you see already
* remove "information and exit" because it's bloat for the
short-help, everybody knows what it does if it exists
In the manpages we should use the old, longer but more correct
descriptions, inclusive a reminder if --help/--version are only
working when used as the only option. Note the term "version
information" indicates that we don't only print a single version
number.
CC: J William Piggott <elseifthen@gmx.com> Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
Ruediger Meier [Sun, 25 Jun 2017 12:49:47 +0000 (14:49 +0200)]
misc: consolidate all --help option descriptions
Now we are always using the same text also for commands
which had still hardcoded descriptions or where we can't
use the standard print_usage_help_options macro.
Ruediger Meier [Sat, 24 Jun 2017 22:19:50 +0000 (00:19 +0200)]
misc: introduce print_usage_help_options()
Consolidate --help and --version descriptions. We are
now able to align them to the other options.
We changed include/c.h. The rest of this patch was
generated by sed, plus manually setting the right
alignment numbers. We do not change anything but
white spaces in the --help output.
Ruediger Meier [Tue, 27 Jun 2017 06:25:22 +0000 (08:25 +0200)]
tools: checkusage can dump all command output
use
$ make CU_DUMP=1 checkusage
for easily reviewing and comparing all output in
/tmp/checkusage--help
/tmp/checkusage--version
/tmp/checkusage--unknownopt
This was a big help when doing all my last usage cleanup.
Actually I used it to dump the original output, edited it
how I would like it, and then changed our programs to match
the wanted output.
Karel Zak [Mon, 26 Jun 2017 13:58:37 +0000 (15:58 +0200)]
Merge branch 'usage-part2' of https://github.com/rudimeier/util-linux
* 'usage-part2' of https://github.com/rudimeier/util-linux:
misc: cosmetics, remove argument from usage(FILE*)
misc: cosmetics, remove argument from usage(int)
misc: never use usage(stderr)
misc: never use usage(ERROR)
misc: cleanup and fix --unknownopt issues
flock, getopt: write --help to stdout and return 0
tools: add checkusage.sh
Sami Kerola [Sun, 18 Jun 2017 17:16:35 +0000 (17:16 +0000)]
uuidparse: add new command
This command will analyze and print information about UUID's. The command
is based on libuuid/src/uuid_time.c but modified to use libsmartcol.
[kzak@redhat.com: - minor coding style changes]
Reference: http://marc.info/?l=util-linux-ng&m=149735980715600&w=2 Signed-off-by: Sami Kerola <kerolasa@iki.fi> Signed-off-by: Karel Zak <kzak@redhat.com>
Ruediger Meier [Tue, 20 Jun 2017 18:20:29 +0000 (20:20 +0200)]
misc: cosmetics, remove argument from usage(FILE*)
This patch is trivial and changes nothing, because
we were always using usage(stdout)
Now all our usage() functions look very similar. If wanted we
could auto-generate another big cosmetical patch to remove all
the useless "FILE *out" constants and use printf and puts
rather than their f* friends. Such patch could be automatically
synchronized with the translation project (newlines!) to not
make the translators sick.
Ruediger Meier [Sun, 18 Jun 2017 22:02:44 +0000 (00:02 +0200)]
flock, getopt: write --help to stdout and return 0
... and use errtryhelp() instead of usage().
Note in past "getopt --help" returned 2. But it is otherwise
documented and was just a mistake IMO. See the unreachable exit(0)
which was removed here: d1d03b54
Ruediger Meier [Sun, 18 Jun 2017 13:19:39 +0000 (15:19 +0200)]
tools: add checkusage.sh
Just some simple generic tests for our UL commands, regarding
options --help, --version and --unknownopt.
The script looks still a bit weired but could be polished to
be used in tests/. It would be the first time testing at least
"something" for *all* built binaries (currently 109! commands).
For the record here are the current candidates with possible
problems:
$ make checkusage
agetty: --unknownopt, stderr too long: 45
blockdev: --unknownopt, stderr too long: 28
flock: --help, no stdout
flock: --help, non-empty stderr
getopt: --help, returns error
kill: --unknownopt, stderr too short: 1
lsipc: --unknownopt, stderr too long: 77
pg: --unknownopt, stderr too long: 23
renice: --unknownopt, stderr too long: 18
rtcwake: --unknownopt, non-empty stdout
rtcwake: --unknownopt, stderr too long: 21
sulogin: --unknownopt, stderr too long: 17
write: --unknownopt, stderr too long: 12
Karel Zak [Mon, 26 Jun 2017 11:56:45 +0000 (13:56 +0200)]
Merge branch '170622' of github.com:jwpi/util-linux
* '170622' of github.com:jwpi/util-linux:
Docs: move option naming to howto-contribute.txt
Docs: update howto-usage-function.txt
Docs: add a comment for constants to boilerplate.c
include/c.h: add USAGE_COMMANDS and USAGE_COLUMNS
Karel Zak [Mon, 26 Jun 2017 11:42:25 +0000 (13:42 +0200)]
Merge branch 'usage-part1' of https://github.com/rudimeier/util-linux
* 'usage-part1' of https://github.com/rudimeier/util-linux:
misc: no more errtryh()
mkfs.cramfs: add --help and --version
more: add --help and --version
whereis: add --help and --version
login: add --help and --version
fsck: add --help and --version
setarch: use errtryhelp()
dmesg: do not accept any non-option arguments
blkid: use errtryhelp instead of errtryh
misc: remove superfluous null pointer checks for optarg
uuidd: remove unused define
Creating and naming options is not done when writing usage().
A contributor may not even read howto-usage-function.txt, but
they should read howto-contribute.txt. So move option naming
and change information there.
Signed-off-by: J William Piggott <elseifthen@gmx.com>
Karel Zak [Fri, 23 Jun 2017 12:26:47 +0000 (14:26 +0200)]
agetty: fix login name DEL/CTRL^U issue
agetty refresh prompt (/etc/issue file etc.) when requested by inotify
or netlink. For this purpose we monitor some file descriptors by
select().
The terminal input file descriptor is switched to non-canonical mode before
select(). The goal is to be informed about user activity before
new-line. The FD is immediately switched back to canonical mode when
activity is detected. The side effect is that all not-read-yet chars in
the input buffer are lost ... so we need to call read() before switch
to canonical mode to save the chars.
The original implementation has been based on TIOCSTI ioctl. It
returns already read chars back to the terminal input buffer to make
them useful for canonical mode. The problem was race (agetty writes to
input buffer in the same time as user) and result was reordered chars
in login name... so useless.
This issue has been later fixed by extra buffer (commit 790119b8850ae13bb4254c5096a54b2aeb355b20) for already read data. And
TIOCSTI ioctl has been removed. Unfortunately this solution is also
wrong, because the buffer is maintained only by agetty and
inaccessible for terminal when user edit (by DEL/CTRL^U) login name in
canonical mode.
The solution is simple -- just don't try to be smart and keep terminal
in canonical mode all time (so terminal controls DEL, CTRL^U, etc) and
flush input buffer (=discard unread data) and ask user for login name
again after prompt reload.
The agetty reload is very rarely situation and for user it's pretty
obvious that he has to type login name again (as all terminal has been
clear+redraw).
Addresses: https://github.com/karelzak/util-linux/issues/454
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1464148 Signed-off-by: Karel Zak <kzak@redhat.com>
Ivan Delalande [Wed, 21 Jun 2017 23:43:05 +0000 (16:43 -0700)]
dmesg: print only 2 hex digits for each hex-escaped byte
As buf is passed as a signed char buffer in fwrite_hex, fprintf will
print every byte from 0x80 as a signed-extended int causing each of
these bytes to be printed as "\xffffff80" and such, which can be pretty
confusing. Force fprintf to use the argument as a char to make it print
only 2 digits, e.g. "\x80".
Pali Rohár [Thu, 22 Jun 2017 08:38:24 +0000 (10:38 +0200)]
tests: Add UDF hdd image which label has length 30 characters
Structure dstring for label has 32 bytes, first byte is 8 (Compression ID),
last byte is 30 (count of 8bit characters in label). Therefore label is not
nul terminated and dstring parser needs to handle it (fixed in previous
commit).
Pali Rohár [Thu, 22 Jun 2017 08:38:08 +0000 (10:38 +0200)]
libblkid: udf: Fix parsing of UDF dstring structures
First byte of dstring is OSTA Compression ID and the last byte is length of
recorded bytes (including first byte). Last byte is not a part of recorded
characters, therefore it should not be treated as data to decode.
Karel Zak [Wed, 21 Jun 2017 09:54:51 +0000 (11:54 +0200)]
Merge branch 'master' of https://github.com/pali/util-linux
* 'master' of https://github.com/pali/util-linux:
tests: Add UDF hdd images with blocksize 1024 and 4096 created by Linux mkudffs 1.3
libblkid: udf: Fix detection of UDF images with block size 1024 and 4096
Karel Zak [Wed, 21 Jun 2017 09:16:23 +0000 (11:16 +0200)]
Merge branch '170427' of github.com:jwpi/util-linux
* '170427' of github.com:jwpi/util-linux:
hwclock: remove unused stdarg.h
Docs: update howto-usage-function.txt
hwclock: add --update-drift check
hwclock: slice up the usage text
hwclock: update --help content and grammar
hwclock: use RTC in help output
include: update pathnames.h
hwclock: add usage() functions heading
hwclock: update usage() FILE name
hwclock: update usage() to util-linux style
hwclock: remove dead code in usage()
Karel Zak [Wed, 21 Jun 2017 08:53:28 +0000 (10:53 +0200)]
wipefs: exit on failed erase
The current behavior is to report error and continue, it seems strange:
# blockdev --setro /dev/sdc
# wipefs -a /dev/sdc
wipefs: /dev/sdc: failed to erase xfs magic string at offset 0x00000000: Operation not permitted
/dev/sdc: 4 bytes were erased at offset 0x00000000 (xfs): 58 46 53 42
^^^^^^^^^^^
not true
The patch calls err() to exit.
Reported-by: Vratislav Podzimek <vpodzime@redhat.com> Signed-off-by: Karel Zak <kzak@redhat.com>
* use /dev/rtc0 (/dev/rtc was for the 'old' driver)
* remove hwclock Award workaround and alpha cmos paths
* relocate _PATH_BTMP from hwclock to login-utils
* add a comment for _PATH_BTMP and fix other login-utils comments
* add a comment for proc/cpuinfo
* remove empty shutdown.c comment from 4d43977f
Review changes
* remove 'used in' comments
* white space fixes
Reviewed-by: Karel Zak <kzak@redhat.com> Signed-off-by: J William Piggott <elseifthen@gmx.com>
Karel Zak [Tue, 20 Jun 2017 10:46:02 +0000 (12:46 +0200)]
libmount: ignore "bind" from fstab on command line "remount"
The current code always apply all flags from /etc/fstab on remount.
Unfortunately remount+bind has special semantic and it's impossible
from command line to avoid interaction with the "bind" from fstab.
This changes the per-mountpoint (VFS) ro flag to rw, but doesn't
change the filesystem itself.
This patch forces libmount to ignore "bind" from fstab when "-o
remount" specified on command line. If you need remount+bind semantic
you have to specify the "bind" flag on command line. This allow to
differentiate between
# mount /foo -o remount,bind,rw --> mount(MS_REMOUNT|MS_BIND)
and
# mount /foo -o remount,rw --> mount(MS_REMOUNT)
Suggested-by: NeilBrown <neilb@suse.com> Signed-off-by: Karel Zak <kzak@redhat.com>
Vinnie Magro [Mon, 19 Jun 2017 21:45:02 +0000 (14:45 -0700)]
dmesg: fragment concatenation
When extended console is enabled, the kernel doesn't internally
concatenate message fragments, this change adds log fragment
concatenation to dmesg: instead of being printed as separate messages,
fragments are combined onto one line and printed with the timestamp of
the first line.
This doesn't work in all cases - such as if another message is logged in
between two fragment lines, but in this case the behavior matches the
previous output format (printed on the separate lines).
[kzak@redhat.com: - rename kmsg_read_buf to kmsg_saved_size,
- minor coding style fixes]
Signed-off-by: Vinnie Magro <vmagro@fb.com> Signed-off-by: Karel Zak <kzak@redhat.com>
Karel Zak [Tue, 20 Jun 2017 08:20:49 +0000 (10:20 +0200)]
Merge branch '170424' of github.com:jwpi/util-linux
* '170424' of github.com:jwpi/util-linux:
parse-date: time_zone_hhmm() bug fixes
parse-date: remove unused ordinal_day_seen
parse-date: remove unused year_seen
parse-date: refactor tm_diff()
parse-date: use to_uchar() instead of assignment.
parse-date: use uintmax_t where appropriate
parse-date: use int where appropriate
parse-date: use intmax_t where appropriate
parse-date: remove unused EPOCH_YEAR
parse-date: replace ISDIGIT with c_isdigit
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