Age | Commit message (Collapse) | Author |
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cp, mv, install, mkdir, mkfifo, mknod are adjusted so that:
-Z no longer accepts an argument.
-Z or --context without an argument do not warn without SELinux.
--context with an argument will warn without SELinux.
* src/local.mk: Reference the new selinux module where required.
* src/system.h: Make the argument to --context optional.
* src/mkdir.c: Likewise. Also handle the SMACK case for --context.
Note we currently silently ignore -Z with SMACK.
* src/mkfifo.c: Likewise.
* src/mknod.c: Likewise.
* src/install.c: Likewise. Note install(1) by default already
set the context for target files to their system default,
albeit with an older method. Use the -Z option to select between
the old and new context restoration behavior, and document
the differences and details for how context restoration
is done in new and old methods, with a view disabling the
old method entirely in future.
* src/cp.c: Make the argument to --context optional.
Note -Z implies --no-preserve=context. I.E. -Z overrides
that aspect of -a no matter what order specified.
(struct cp_options): Document the context handling options.
(main): Check/adjust option combinations after all
options are processed, to both simplify processing
and to make handling independent of order of options
on the command line. Also improve the diagnostics
from a failed call to setfscreatecon().
(set_process_security_ctx): A new function,
refactored to set the default context from the source file,
or with the type adjusted as per the system default for
the destination path.
(set_file_security_ctx): A new function refactored to
set the security context of an existing file, either based on
the process context or the default system context for a path.
(copy_internal): Use the refactored functions to simplify
error handling and consistently fail or warn as needed.
(copy_reg): Likewise.
(copy_internal): With --preserve=context, also copy
context from non regular files. Note for directories this may
impact the copying of subsequent files to that directory?
(copy_attr): If we're handling SELinux explicitly,
then exclude to avoid the redudant copy with --preserve=context,
and the problematic copy with -Z. Note SELinux attribute exclusion
also now honors cp -a --no-preserve=context. Note there was a
very small window over 10 years ago, where attr_copy_file was
available, while attr_copy_check_permissions was not, so we
don't bother adding an explicit m4 check for the latter function.
* src/mv.c: Support --context, but don't allow specifying an argument.
* src/chcon.c: Adjust a comment to be specific to SELinux.
* src/runcon.c: Likewise.
* src/copy.c: Honor the context settings to "restorecon" as appropriate.
* src/copy.h: Add a new setting to select "restorecon" functionality.
* tests/mkdir/selinux.sh: s/-Z/--context=/
* tests/cp/cp-a-selinux.sh: Augment this test with cases
testing basic -Z functionality, and also test the various
invalid option combinations and option precedence.
* tests/mkdir/restorecon.sh: Add a new test for the
more involved mkdir -Z handling, since the directory changing
and non existent directories need to be specially handled.
Also check the similar but simpler handling of -Z by mk{nod,fifo}.
* tests/local.mk: Reference the new test.
* doc/coreutils.texi (cp invocation): Update as per interface changes.
(mv invocation): Likewise.
(install invocation): Likewise.
(mkfifo invocation): Likewise.
(mknod invocation): Likewise.
(mkdir invocation): Likewise.
* NEWS: Mention the new feature and change in behavior.
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* src/id.c (usage): Remove 'name' from the synopsis,
implying that one can also specify by user ID.
(main): Like chown(1), call parse_user_spec() to implement
user name or ID lookup with appropriate precedence.
* doc/coreutils.texi (id invocation): Mention that
a user ID is supported and how '+' affects lookup order.
* tests/misc/id-groups.sh: Remove test now subsumed into...
* tests/misc/id-uid.sh: New test covering new interface.
* tests/local.mk: Rename the test.
* NEWS: Mention the new feature.
Addresses http://bugs.gnu.org/15421
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* src/group-list.h (print_group_list): Add a parameter for the
delimiter of type char.
* src/group-list.c (print_group_list): Likewise, and use it instead
of a white space character to delimit the group entries.
* src/groups.c (main): Pass white space character to print_group_list().
* src/id.c (longopts): Add array element for the new long option.
(usage): Document the new option. While at it, fix the alignment
of the descriptions to match that of HELP_OPTION_DESCRIPTION.
(main): Define the bool flag opt_zero indicating the use of the
new option. In the getopt_long loop, handle it.
Output an error diagnostic in the case the --zero option has been
specified together with the default format.
In the case of -gG, pass either a NUL or a white space character to
print_group_list() - depending on the above new flag.
Likewise change the printing of the final newline character: output
a NUL instead if the --zero option has been specified.
* doc/coreutils.texi (id invocation): Document the new option.
While at it, move the @exitstatus macro down after the macro
@primaryAndSupplementaryGroups in order to be consistent with
other texinfo documents.
(groups invocation): Move @exitstatus down after the macro
@primaryAndSupplementaryGroups here, too.
* tests/misc/id-zero.sh: Add new test exercising the new option.
* tests/local.mk (all_tests): Reference it.
* NEWS (New features): Mention the new option.
Fixes http://bugs.gnu.org/9987
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Consolidate all smack routines and checks in a module.
We replace and wrap the most commonly used smack routines,
which allows removing ifdefs throughout the code.
* gl/lib/smack.h: A new header containing the implementation
of the wrapped and replacement routines. Note the is_smack_enabled()
routine should be optimized out at compile time when compiled
on a system without libsmack.
* gl/modules/smack: Describe the new module and move the
configure time code here from ...
* m4/jm-macros.m4: ... here.
* bootstrap.conf: Reference the new module.
* src/id.c: Use the routines without ifdefs where possible.
* src/ls.c: Likewise.
* src/mkdir.c: Likewise.
* src/mkfifo.c: Likewise.
* src/mknod.c: Likewise.
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* src/id.c (main): Be consistent with the SELinux case,
and only show errors in getting the security context
when -Z is specified.
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There was slight change to libsmack such that positive values are
reserved for returning length of the label for smack_new_label_from_*
functions.
* m4/jm-macros.m4: Set HAVE_SMACK when both smack_new_label_from_self()
and recently added smack_new_label_from_path() are present.
The latter's presence indicates the newer API of the former.
* src/id.c (main): Check that smack_new_label_from_self() < 0,
and not just non-zero.
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Adds an optional dependency on libsmack.
* m4/jm-macros.m4: Look for the smack library/header.
* src/id.c (main): Output the smack context if available.
* src/local.mk: Link with libsmack if available.
* NEWS: Mention the new feature.
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Run "make update-copyright", but then also run this,
perl -pi -e 's/2\d\d\d-//' tests/sample-test
to make that one script use the single most recent year number.
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* src/id.c (gidtostr, uidtostr): Define macros.
(gidtostr_ptr, uidtostr_ptr): Define safer functions.
Use gidtostr and uidtostr to print GID and UID without
need/risk of casts.
* src/group-list.c: Likewise.
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* src/copy.c (copy_reg): Split an expression before a binary operator,
not after it.
* src/cut.c (set_fields): Likewise.
* src/id.c (main): Likewise.
* src/install.c (setdefaultfilecon): Likewise.
* src/join.c (ignore_case): Likewise.
* src/pr.c (cols_ready_to_print, init_parameters, print_page): Likewise.
* src/stty.c (set_window_size): Likewise.
* src/wc.c (SUPPORT_OLD_MBRTOWC): Likewise.
* src/who.c (scan_entries): Likewise.
* src/test.c (binary_operator): Join a split line.
* src/extent-scan.c (extent_scan_read): Move an ">" from end of line
to beginning of the following.
Likewise for two other expressions.
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* src/id.c (main): Using -Z with -r or -n would fail with "id: cannot
print only names or real IDs in default format", in spite of that "-Z",
which specifies a non-default format. Now, it succeeds and ignores
the -n or -r option. The error was that the test for default_format
was not updated when I added the new --context (-Z) option in
commit v6.9-33-g5320d0f.
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* src/id.c (main): Invocations like "id" and "id -G" would call getcon
to determine the current security context even though that result would
not be used. Similarly, when POSIXLY_CORRECT is set. Rearrange
conditionals and hoist the POSIXLY_CORRECT test so that we call
getcon only when necessary.
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* src/id.c (main): Factor out uses of "argc - optind".
Move option-consistency checks to precede the potential getcon call.
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Run this (twice):
git grep -E -l '`[^ ]+'\' src/*.c \
|xargs perl -pi -e 's/`([^ ]+'\'')/'\''$1/'
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Run this command:
perl -0777 -pi -e \
's/fprintf \(stderr, _\("Try `%s --help.*\n.*;/emit_try_help ();/m'\
src/*.c
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Run "make update-copyright".
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* src/id.c (main): Report an error if no args are given and getuid
fails, because print_full_info needs ruid. Redo code so that
getuid and friends are invoked only when needed; this makes the
code easier to follow, and is how I found the above bug.
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* src/id.c (main): Replace confusing use of "etc.".
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* src/id.c (GETID_MAY_FAIL): Remove.
(main): Check for nonzero errno, rather than having a compile-time
GETID_MAY_FAIL guess. Suggested by Roland McGrath in
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10021#47>.
Also, the old code was incorrect if uid_t was narrower than int.
(print_full_info): Remove unnecessary cast to -1.
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* src/id.c (GETID_MAY_FAIL, main, print_full_info): Undo previous change.
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* doc/coreutils.texi (Block size): IEC 60027-2 has been superseded
by ISO/IEC 80000-13, so prefer the newer standard but also mention
the old. The new standard specifies Zi and Yi, so they are no
longer GNU extensions. Fix stale URL to BIPM.
2011-11-14 Paul Eggert <eggert@cs.ucla.edu>
id: handle (uid_t) -1 more portably
* src/id.c (GETID_MAY_FAIL): Remove.
(main): Check for negative return values, not for -1.
The old code was incorrect if uid_t was narrower than int,
regardless of whether we were on a GNU or a POSIX platform.
The new code is simpler and doesn't need GETID_MAY_FAIL.
(print_full_info): Remove unnecessary cast to -1.
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POSIX-conforming getuid, geteuid, etc. functions cannot fail,
but on GNU/Hurd systems and some others, they may.
* src/id.c (main) [__GNU__]: Detect and diagnose any such failure.
* tests/id/gnu-zero-uids: New file.
* tests/Makefile.am (TESTS): Add it to the list.
* tests/init.cfg (require_gnu_): New function.
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* src/groups.c (main): Don't capitalize the first word of diagnostic.
* src/id.c (main): Likewise.
Reported by Ludovic Courtès.
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Run "make update-copyright".
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Use this command:
git ls-files | grep -v COPYING \
| xargs env UPDATE_COPYRIGHT_USE_INTERVALS=1 \
build-aux/update-copyright
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If getgroups failed with ENOSYS, mgetgroups would unnecessarily
fail, and that provoked id into freeing an uninitialized pointer.
Meanwhile, we were not using xalloc_die properly. Both issues
are better solved in gnulib, by introducing xgetgroups; this
patch uses the new interface.
Regression introduced by commit 6a31fd8d7.
* gnulib: Update, for mgetgroups improvments.
* src/id.c (print_full_info): Adjust caller to die on allocation
failure, and no longer worry about ENOSYS.
* src/group-list.c (print_group_list): Likewise.
* src/setuidgid.c (main): Likewise.
* NEWS: Mention the fix.
* THANKS: Update.
Reported by Scott Harrison.
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A replacement getgroups is now guaranteed to exist, but it may
fail with ENOSYS. mgetgroups is moved to gnulib, and now takes
gid_t instead of GETGROUPS_T (but setgroups still needs GETGROUPS_T).
* gnulib: Update to latest.
* gl/modules/mgetgroups: Delete, moved to gnulib.
* gl/m4/mgetgroups.m4: Likewise.
* gl/lib/mgetgroups.h: Likewise.
* gl/lib/mgetgroups.c: Likewise.
* src/group-list.c (print_group_list): Adjust callers.
* src/id.c (print_full_info): Likewise.
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This is because bitwise operators are:
- confusing and inconsistent in a boolean context
- non short circuiting
- brittle in C89 where bool can be an int (so > 1)
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* src/system.h: Rename emit_bug_reporting_address() to
emit_ancillary_info() and update it to not print the translation
project address in en_* locales, and _do_ print it in the 'C'
(and other) locales so that it's included in the default man page.
Also mention how to invoke the texinfo documentation for each command.
Also move the "hard-locale.h" include to the 8 files that now use it.
* man/help2man: Strip the newly added texinfo reference from the
--help output as a more verbose version is already added by help2man.
Suggestion from C de-Avillez
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* src/id.c (print_full_info) [POSIXLY_CORRECT]: Don't print context.
Reported by Ulrich Drepper.
* NEWS (Changes in behavior): Mention it.
* doc/coreutils.texi (id invocation): Document that id also prints the
security context, when possible, and when POSIXLY_CORRECT is not set.
* tests/id/no-context: New file. Test for this.
* tests/Makefile.am (TESTS): Add it.
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Transformed via this shell code:
t=$'\t'
git ls-files \
| grep -vE '(^|/)((GNU)?[Mm]akefile|ChangeLog)|\.(am|mk)$' \
| grep -vE 'tests/pr/|help2man' \
| xargs grep -lE "^ *$t" \
| xargs perl -MText::Tabs -ni -le \
'$m=/^( *\t[ \t]*)(.*)/; print $m ? expand($1) . $2 : $_'
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* src/id.c (usage): Improve description, based on a suggestion
from Brian M. Carlson in http://bugs.debian.org/514675
* man/id.x: Use a better one-liner, based on the one at top of id.c.
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* gl/lib/mgetgroups.c: Avoid -Wsign-compare warning by using unsigned
types for the parameters of the new function realloc_groupbuf().
mgetgroups() was refactored to use this function rather than
explicitly allocating and copying from automatic storage itself.
* src/group-list.c: Use int rather than size_t as variable is
used in signed comparisons.
* src/id.c: ditto.
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In 1463824d8e7f72c31f1d803d7cfe2b608ccafc5c, I added some
missing "const" directives, as well as some new, redundant ones.
This removes the redundant ones. Pointed out by Eric Blake.
* base64.c, cat.c, chcon.c, chgrp.c, chmod.c, chown.c, comm.c:
* cp.c, csplit.c, cut.c, date.c, dd.c, df.c, dircolors.c, du.c:
* env.c, expand.c, fmt.c, fold.c, groups.c, head.c, id.c:
* install.c, join.c, kill.c, ln.c, ls.c, md5sum.c, mkdir.c:
* mkfifo.c, mknod.c, mktemp.c, mv.c, nice.c, nl.c, od.c:
* paste.c, pathchk.c, pinky.c, pr.c, ptx.c, readlink.c, rm.c:
* rmdir.c, runcon.c, seq.c, shred.c, shuf.c, sort.c, split.c:
* stat.c, stty.c, su.c, sum.c, tac.c, tail.c, tee.c, timeout.c:
* touch.c, tr.c, truncate.c, tty.c, uname.c, unexpand.c, uniq.c:
* wc.c, who.c: Remove redundant const directives.
* maint.mk (sc_const_long_option): Don't require redundant "const".
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* maint.mk (sc_const_long_option): New rule. Enforce global change.
* src/base64.c (long_options): Use "const" where possible.
* src/cat.c (main): Likewise.
* src/chcon.c (long_options): Likewise.
* src/chgrp.c (long_options): Likewise.
* src/chmod.c (long_options): Likewise.
* src/chown.c (long_options): Likewise.
* src/comm.c (long_options, OUTPUT_DELIMITER_OPTION): Likewise.
* src/cp.c (long_opts): Likewise.
* src/csplit.c (longopts): Likewise.
* src/cut.c (longopts): Likewise.
* src/date.c (long_options): Likewise.
* src/dd.c (conversions, flags, statuses): Likewise.
* src/df.c (long_options): Likewise.
* src/dircolors.c (long_options): Likewise.
* src/du.c (long_options): Likewise.
* src/env.c (longopts): Likewise.
* src/expand.c (longopts): Likewise.
* src/fmt.c (long_options): Likewise.
* src/fold.c (longopts): Likewise.
* src/groups.c (longopts): Likewise.
* src/head.c (long_options): Likewise.
* src/id.c (longopts): Likewise.
* src/install.c (long_options): Likewise.
* src/join.c (longopts): Likewise.
* src/kill.c (long_options): Likewise.
* src/ln.c (long_options): Likewise.
* src/ls.c (long_time_format, long_options, sort_functions): Likewise.
* src/md5sum.c (long_options): Likewise.
* src/mkdir.c (longopts): Likewise.
* src/mkfifo.c (longopts): Likewise.
* src/mknod.c (longopts): Likewise.
* src/mktemp.c (longopts): Likewise.
* src/mv.c (long_options): Likewise.
* src/nice.c (longopts): Likewise.
* src/nl.c (longopts): Likewise.
* src/od.c (charname, long_options): Likewise.
* src/paste.c (longopts): Likewise.
* src/pathchk.c (longopts): Likewise.
* src/pinky.c (longopts): Likewise.
* src/pr.c (long_options): Likewise.
* src/ptx.c (long_options): Likewise.
* src/readlink.c (longopts): Likewise.
* src/rm.c (long_opts): Likewise.
* src/rmdir.c (longopts): Likewise.
* src/runcon.c (long_options): Likewise.
* src/seq.c (long_options): Likewise.
* src/shred.c (long_opts): Likewise.
* src/shuf.c (long_opts): Likewise.
* src/sort.c (monthtab, long_options): Likewise.
* src/split.c (longopts): Likewise.
* src/stat.c (long_options): Likewise.
* src/stty.c (mode_info, control_info, longopts, set_mode) Likewise.
(set_control_char, speeds): Likewise.
* src/su.c (longopts): Likewise.
* src/sum.c (longopts): Likewise.
* src/tac.c (longopts): Likewise.
* src/tail.c (long_options): Likewise.
* src/tee.c (long_options): Likewise.
* src/timeout.c (long_options): Likewise.
* src/touch.c (longopts): Likewise.
* src/tr.c (long_options): Likewise.
* src/truncate.c (longopts): Likewise.
* src/tty.c (longopts): Likewise.
* src/uname.c (uname_long_options, arch_long_options): Likewise.
* src/unexpand.c (longopts): Likewise.
* src/uniq.c (longopts): Likewise.
* src/wc.c (longopts): Likewise.
* src/who.c (longopts): Likewise.
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* bootstrap.conf (gnulib_modules): Add progname.
* src/*.c (program_name): Remove declaration.
* (main): Call set_program_name rather than setting program_name.
* src/nice.c (main): Cast program_name to "(char *)".
* src/prog-fprintf.c: Include "system.h"
* src/system.h: Include "progname.h".
* maint.mk (sc_program_name): Adjust rule.
Suggestion from Eric Blake.
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* src/base64.c: Likewise.
* src/basename.c: Likewise.
* src/cat.c: Likewise.
* src/chcon.c: Likewise.
* src/chgrp.c: Likewise.
* src/chmod.c: Likewise.
* src/chown.c: Likewise.
* src/chroot.c: Likewise.
* src/cksum.c: Likewise.
* src/comm.c: Likewise.
* src/cp.c: Likewise.
* src/csplit.c: Likewise.
* src/cut.c: Likewise.
* src/date.c: Likewise.
* src/dd.c: Likewise.
* src/df.c: Likewise.
* src/dircolors.c: Likewise.
* src/dirname.c: Likewise.
* src/du.c: Likewise.
* src/echo.c: Likewise.
* src/env.c: Likewise.
* src/expand.c: Likewise.
* src/expr.c: Likewise.
* src/factor.c: Likewise.
* src/fmt.c: Likewise.
* src/fold.c: Likewise.
* src/groups.c: Likewise.
* src/head.c: Likewise.
* src/hostid.c: Likewise.
* src/hostname.c: Likewise.
* src/id.c: Likewise.
* src/install.c: Likewise.
* src/join.c: Likewise.
* src/kill.c: Likewise.
* src/link.c: Likewise.
* src/ln.c: Likewise.
* src/logname.c: Likewise.
* src/ls.c: Likewise.
* src/md5sum.c: Likewise.
* src/mkdir.c: Likewise.
* src/mkfifo.c: Likewise.
* src/mknod.c: Likewise.
* src/mktemp.c: Likewise.
* src/mv.c: Likewise.
* src/nice.c: Likewise.
* src/nl.c: Likewise.
* src/nohup.c: Likewise.
* src/od.c: Likewise.
* src/paste.c: Likewise.
* src/pathchk.c: Likewise.
* src/pinky.c: Likewise.
* src/pr.c: Likewise.
* src/printenv.c: Likewise.
* src/printf.c: Likewise.
* src/ptx.c: Likewise.
* src/pwd.c: Likewise.
* src/readlink.c: Likewise.
* src/rm.c: Likewise.
* src/rmdir.c: Likewise.
* src/runcon.c: Likewise.
* src/seq.c: Likewise.
* src/setuidgid.c: Likewise.
* src/shuf.c: Likewise.
* src/sleep.c: Likewise.
* src/sort.c: Likewise.
* src/split.c: Likewise.
* src/stat.c: Likewise.
* src/stty.c: Likewise.
* src/su.c: Likewise.
* src/sum.c: Likewise.
* src/sync.c: Likewise.
* src/tac.c: Likewise.
* src/tail.c: Likewise.
* src/tee.c: Likewise.
* src/test.c: Likewise.
* src/timeout.c: Likewise.
* src/touch.c: Likewise.
* src/tr.c: Likewise.
* src/true.c: Likewise.
* src/tsort.c: Likewise.
* src/tty.c: Likewise.
* src/uname.c: Likewise.
* src/unexpand.c: Likewise.
* src/uniq.c: Likewise.
* src/unlink.c: Likewise.
* src/uptime.c: Likewise.
* src/users.c: Likewise.
* src/wc.c: Likewise.
* src/who.c: Likewise.
* src/whoami.c: Likewise.
* src/yes.c: Likewise.
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g grep -E -l 'define AUTHORS "[^,]+", "[^,]+"$'|xargs perl -pi -e \
's/(define AUTHORS) ("[^,]+"), ("[^,]+")$/$1 \\\n proper_name ($2), \\\n proper_name ($3)/'
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* NEWS: Mention new behaviour.
* src/id.c (main): Do not print SELinux context when user is specified.
* tests/Makefile.am: Add the new test.
* tests/misc/id-context: New file. Test for the fix.
Problem reported by Ronny Buchmann in http://bugzilla.redhat.com/443485.
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In 6.11, we mistakenly suppressed the printing of certain group IDs,
thinking they were useless AFS-specific artifacts.
This change reverts that, so now they are printed once again.
http://thread.gmane.org/gmane.org.fsf.announce/867/focus=13345
This also reverts the bug-fix that applied solely to the new code
used to avoid printing those IDs
Revert "id bug fix: don't point to potentially clobbered static storage"
This reverts commit f7d1c59c224f81a8bab5fa2afcaf815988f50467.
Revert "Work around AFS bug: id and groups would print invalid group number."
This reverts commit b7a836c0a3524cda8ef79c30c3fe7ea759ae4656.
Revert "* src/c99-to-c89.diff: Accommodate a C99-ism in id.c."
This reverts commit d44893c5dba4150b4ded9cf6aad316c1ef620c9f.
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On at least Mac OS, when calling getpwuid twice with the same UID,
the static storage containing results from the first call is
invalidated by the second call.
* src/id.c (main): Point to a copy of the user name string.
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* src/id.c (main): Call print_group_list with a user name, if possible.
* src/groups.c (main): Likewise.
* NEWS: Mention this.
For details, see
http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/12852
http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/12875
Signed-off-by: ribalba <geerd.dietger.hoffmann@gmail.com>
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* src/groups.c (main): New file, replacing groups.sh.
* src/group-list.c, src/group-list.h: New files, factored out of id.c,
implementing the functionality that "id" and "groups" have in common.
* src/id.c (print_full_info): Avoid a segfault when trying to print
an error message if getgroups fails.
(print_group_list): Move to group-list.c.
(print_group): Likewise.
* man/Makefile.am: When building groups.1, obtain the help text
from src/groups.c, not src/groups.sh.
(noinst_HEADERS): Add group-list.h.
(group): Remove rule.
(dist_man_MANS): Remove groups.1.
* doc/coreutils.texi (groups: Print group names a user is in):
Explain why "groups" and "groups $(id -un)" give different results
in existing login sessions after you change the group database.
(id: Print user identity): Likewise for "id".
* po/POTFILES.in: Add src/group-list.c and src/groups.c.
* NEWS: mention this.
* AUTHORS: Update.
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I wanted to use the xgetgroups function from id.c, so factored it out
and made it into a non-exiting function (hence the "m" prefix rather than "x").
* src/setuidgid.c (main): Use mgetgroups. Include "mgetgroups.h".
* src/id.c (xgetgroups): Remove function.
Include "mgetgroups.h".
(print_group_list): Use mgetgroups, not xgetgroups.
* gl/modules/mgetgroups: New module.
* gl/lib/mgetgroups.c: New file. mgetgroups is derived from
id.c's xgetgroups function.
* bootstrap.conf (gnulib_modules): Add mgetgroups.
* gl/m4/mgetgroups.m4: New file.
* gl/lib/mgetgroups.h: New file.
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