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From d7725fb45fe8d4fcb67cb9fbc117bc1cf66fcd56 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 17 Oct 2017 10:44:01 +0200
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Subject: [PATCH 136/141] blkid: update man page about lsblk and ambivalent
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probing
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Upstream: http://github.com/karelzak/util-linux/commit/12786a901520d7b30ff75ee8727221bf8a3089cb
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Upstream: http://github.com/karelzak/util-linux/commit/27fbfef33c1f23b5448b6cee856bcb3500b33c42
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1501953
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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misc-utils/blkid.8 | 39 +++++++++++++++++++++++++++------------
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1 file changed, 27 insertions(+), 12 deletions(-)
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diff --git a/misc-utils/blkid.8 b/misc-utils/blkid.8
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index a974b8e99..1f12d202a 100644
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--- a/misc-utils/blkid.8
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+++ b/misc-utils/blkid.8
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@@ -61,6 +61,23 @@ library. It can determine the type of content (e.g. filesystem or swap)
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that a block device holds, and also the attributes (tokens, NAME=value pairs)
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from the content metadata (e.g. LABEL or UUID fields).
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.PP
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+.B It is recommended to use
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+.BR lsblk (8)
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+.B command to get information about block devices, or lsblk --fs to get an overview of filesystems, or
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+.BR findmnt (8)
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+.B to search in already mounted filesystems.
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+.PP
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+.RS
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+.BR lsblk (8)
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+provides more information, better control on output formatting, easy to use in
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+scripts and it does not require root permissions to get actual information.
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+.B blkid
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+reads information directly from devices and for non-root users
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+it returns cached unverified information.
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+.B blkid
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+is mostly designed for system services and to test libblkid functionality.
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+.RE
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+.PP
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When
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.I device
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is specified, tokens from only this device are displayed.
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@@ -71,21 +88,19 @@ If none is given, all devices which appear in
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.I /proc/partitions
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are shown, if they are recognized.
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.PP
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-Note that
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-.B blkid
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-reads information directly from devices and for non-root users
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-it returns cached unverified information. It is better to use
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-.B lsblk --fs
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-to get a user-friendly overview of filesystems and devices.
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-.BR lsblk (8)
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-is also easy to use in scripts.
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-.B blkid
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-is mostly designed for system services and to test libblkid functionality.
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-.PP
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.B blkid
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has two main forms of operation: either searching for a device with a
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specific NAME=value pair, or displaying NAME=value pairs for one or
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more specified devices.
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+.PP
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+For security reasons
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+.B blkid
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+silently ignores all devices where the probing result is ambivalent (multiple
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+colliding filesystems are detected). The low-level probing mode (\fB-p\fR)
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+provides more information and extra return code in this case.
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+It's recommended to use
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+.BR wipefs (8)
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+to get a detailed overview and to erase obsolete stuff (magic strings) from the device.
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.SH OPTIONS
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The \fIsize\fR and \fIoffset\fR arguments may be followed by the multiplicative
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suffixes like KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB
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@@ -264,7 +279,7 @@ identified, an exit code of 2 is returned.
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For usage or other errors, an exit code of 4 is returned.
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-If an ambivalent low-level probing result was detected, an exit code of 8 is
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+If an ambivalent probing result was detected by low-level probing mode (\fB\-p\fR), an exit code of 8 is
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returned.
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.SH CONFIGURATION FILE
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The standard location of the
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--
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2.13.6
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