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Tycho Andersen 64cb2da8dc libmount: do not unnecessarily chmod utab.lock
Before ecfeae90a2 ("libmount: Ensure utab.lock mode 644"), you could do
something like:

irc:/tmp umount --version
umount from util-linux 2.27.1 (libmount 2.27.0: selinux, assert, debug)
irc:/tmp mkdir foo bar
irc:/tmp unshare -Urm
irc:/tmp mount --bind foo bar
irc:/tmp umount bar
irc:/tmp echo $?
0

However, afterwards, you get:

/tmp unshare -Urm
/tmp mount --bind foo bar
/tmp umount bar
umount: /tmp/bar: filesystem was unmounted, but failed to update userspace mount table.

Because of the chmod failing:

fchmod(3, 0644)                         = -1 EPERM (Operation not permitted)

Let's figure out whether the chmod is necessary before doing it, and only
do it if it is necessary. This won't fix cases where the system is already
broken, but at least on healthy systems umount will behave as before.

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
2020-04-22 12:36:43 +02:00
Documentation docs: add rev(1) to TODO 2020-03-09 11:07:48 +01:00
bash-completion more: use getopt_long() to parse options 2020-04-13 12:14:08 +01:00
config build-sys: gtkdoc-fixxref v1.27 requires module option 2018-02-01 13:23:40 +01:00
disk-utils [clang-tidy] fix misleading identation 2020-04-20 13:21:00 -07:00
include lib/mbsalign: add function to calculate width 2020-04-22 12:22:29 +02:00
lib lib/mbsalign: add function to calculate width 2020-04-22 12:22:29 +02:00
libblkid [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
libfdisk [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
libmount libmount: do not unnecessarily chmod utab.lock 2020-04-22 12:36:43 +02:00
libsmartcols libsmartcols: don't calculate with encoding on scols_table_enable_noencoding() 2020-04-22 12:24:33 +02:00
libuuid [clang-tidy] do not use else after return 2020-04-20 13:20:59 -07:00
login-utils [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
m4 build-sys: add missing NR underscore to UL_CHECK_SYSCALL() 2019-11-25 20:33:05 +00:00
misc-utils [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
po po: update uk.po (from translationproject.org) 2020-01-22 20:52:11 +02:00
schedutils chrt: Use sched_setscheduler system call directly 2020-01-30 10:45:32 +01:00
sys-utils eject: fix compiler warning [-Wformat-overflow] 2020-04-22 10:32:49 +02:00
term-utils [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
tests [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
text-utils [clang-tidy] fix wrong *cmp usage 2020-04-20 13:21:00 -07:00
tools build-sys: add --with-cryptsetup to config-gen.d/all.conf 2019-12-05 14:57:50 +01:00
.editorconfig add .editorconfig 2016-01-25 00:12:14 +01:00
.gitignore lsirq: add new command 2020-03-06 16:21:10 +01:00
.travis-functions.sh travis: fix sudo command line 2019-12-16 14:29:33 +01:00
.travis.yml docs: add info about branches; update travis.yml 2018-10-24 13:02:59 +02:00
AUTHORS docs: update AUTHORS file 2020-01-21 11:07:27 +01:00
COPYING docs: corrections to FSF license files, and postal address 2012-02-24 14:13:35 +01:00
ChangeLog build-sys: use AUTOMAKE_OPTIONS = gnu 2011-05-26 15:04:01 +02:00
Makefile.am getopt: use examples installation directory in man page 2020-02-15 15:24:01 +00:00
NEWS build-sys: release++ (v2.35) 2020-01-21 11:15:21 +01:00
README docs: add link to mail list archive 2018-12-17 10:16:22 +01:00
README.licensing docs: add GPLv3 text 2019-11-08 11:10:54 +01:00
autogen.sh build-sys: improve bison version detection 2018-04-30 09:43:32 +02:00
configure.ac more: replace siglongjmp() and signal() calls with signalfd() 2020-03-27 21:06:01 +00:00
util-linux.doap docs: replace FTP by HTTPS in kernel.org URLs 2016-12-19 11:22:26 +01:00

README

				  util-linux

		util-linux is a random collection of Linux utilities

     Note: for the years 2006-2010 this project was named "util-linux-ng".

MAILING LIST:

      E-MAIL:  util-linux@vger.kernel.org
      URL:     http://vger.kernel.org/vger-lists.html#util-linux
      ARCHIVE: https://lore.kernel.org/util-linux/

      The mailing list will reject email messages that contain:
       - more than 100K characters
       - html
       - spam phrases/keywords
      See: http://vger.kernel.org/majordomo-info.html#taboo

IRC CHANNEL:

      #util-linux at freenode.net:

      irc://chat.freenode.net/util-linux

      The IRC channel and Mailing list are for developers and project
      maintainers. For end users it is recommended to utilize the
      distribution's support system.

BUG REPORTING:

      E-MAIL: util-linux@vger.kernel.org
      Web:    https://github.com/karelzak/util-linux/issues

      This project has no resources to provide support for distribution specific
      issues. For end users it is recommended to utilize the distribution's
      support system.

NLS (PO TRANSLATIONS):

      PO files are maintained by:
	  http://translationproject.org/domain/util-linux.html

VERSION SCHEMA:

      Standard releases:
	  <major>.<minor>[.<maint>]
	     major = fatal and deep changes
	     minor = typical release with new features
	     maint = maintenance releases; bug fixes only

      Development releases:
	 <major>.<minor>-rc<N>

SOURCE CODE:

 Download archive:
	  https://www.kernel.org/pub/linux/utils/util-linux/

 SCM (Source Code Management) Repository:

    Primary repository:
	  git clone git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git

    Backup repository:
	  git clone git://github.com/karelzak/util-linux.git

    Web interfaces:
	  http://git.kernel.org/cgit/utils/util-linux/util-linux.git
	  https://github.com/karelzak/util-linux

      Note: the GitHub repository may contain temporary development branches too.

      The kernel.org repository contains master (current development) and stable/*
      (maintenance) branches only. All master or stable/* changes are always pushed
      to both repositories at the same time.

    Repository Branches: 'git branch -a'
	  master branch
	   - current development
	   - the source for stable releases when deemed ready.
	   - day-to-day status is: 'it works for me'. This means that its
	     normal state is useful but not well tested.
	   - long-term development or invasive changes in active development are
	     forked into separate 'topic' branches from the tip of 'master'.

	  stable/ branches
	   - public releases
	   - branch name: stable/v<major>.<minor>.
	   - created from the 'master' branch after two or more release
	     candidates and the final public release. This means that the stable
	     releases are committed, tagged, and reachable in 'master'.
	   - these branches then become forked development branches. This means
	     that any changes made to them diverge from the 'master' branch.
	   - maintenance releases are part of, and belong to, their respective
	     stable branch. As such, they are tags(<major>.<minor>.<maint>) and
	     not branches of their own. They are not part of, visible in, or
	     have anything to do with the 'master' development branch. In git
	     terminology: maintenance releases are not reachable from 'master'.
	   - when initially cloned (as with the 'git clone' command given above)
	     these branches are created as 'remote tracking branches' and are
	     only visible by using the -a or -r options to 'git branch'. To
	     create a local branch use the desired tag with this command:
	     'git checkout -b v2.29.2 v2.29.2'

    Tags: 'git tag'
	   - a new tag object is created for every release.
	   - tag name: v<version>.
	   - all tags are signed by the maintainer's PGP key.

    Known Bugs:
	- don't use tag v2.13.1 (created and published by mistake),
	  use v2.13.1-REAL instead.

WORKFLOW EXAMPLE:

 1) development (branch: <master>)

 2) master release (tags: v2.29-rc1, v2.29-rc2, v2.29, branch: <master>)

 3) development (work on v2.30, branch: <master>)

 4) fork -- create a new branch <stable/v2.29> based on tag v2.29

     4a) new patches or cherry-pick patches from <master> (branch: <stable/v2.29>)

     4b) stable release (tag: v2.29.1, branch: <stable/v2.29>)

     4c) more patches; another release (tag: v2.29.2, branch: <stable/v2.29>)

 5) master release v2.30 (branch: <master>)
    ...

where 3) and 4) happen simultaneously.