Dlaczego ta strona podręcznika ma dzisiejszą datę?

Dlaczego konkretna manstrona (w moim przypadku dla ncpolecenia) miałaby dzisiejszą datę bez mojej aktualizacji systemu? Ponadto dlaczego dziennik „aktualizacji nienadzorowanej” nie pokazuje żadnej konkretnej aktywności na ten dzień?

2018-03-14 07:47:38,124 INFO Initial blacklisted packages:
2018-03-14 07:47:38,135 INFO Starting unattended upgrades script
2018-03-14 07:47:38,135 INFO Allowed origins are: ['o=LinuxMint,a=qiana-security', 'o=LinuxMintESM,a=qiana']
2018-03-14 07:47:51,767 INFO No packages found that can be upgraded unattended and no pending auto-removals

Oto stopka strony ncman:

BSD                             March 14, 2018                             BSD

Dotyczy to Linux Mint 17 (qiana), opartego na Ubuntu 14.04 (zaufany) z groff 1.22.2 i man-db 2.6.7.1.

EDYTOWAĆ

Żądane polecenia wyjściowe:

1. man -aw nc

   /usr/share/man/man1/nc_openbsd.1.gz
   

2. ls -ld $(man -aw nc)

   -rw-r--r-- 1 root root 5.7K Dec  4  2012 /usr/share/man/man1/nc_openbsd.1.gz
   

Co jest dziwne ...

3. dpkg -S $(man -aw nc)?

   netcat-openbsd: /usr/share/man/man1/nc_openbsd.1.gz
   

4. type -a man

   man is /usr/bin/man
   

5. zgrep docdate $(man -aw nc)

   .Dd $Mdocdate: February 7 2012 $
   

6. DODATKOWE STOPY strace -f man nc 2>&1 | grep -e '^BSD' -e '"/.*nc'

   ychaouche#ychaouche-PC 14:31:15 ~ $ strace -f man nc 2>&1 | grep -e '^BSD' -e '"/.*nc'
   execve("/usr/bin/man", ["man", "nc"], [/* 87 vars */]) = 0
   lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
   lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
   readlink("/usr/share/man/man1/nc.1.gz", "/etc/alternatives/nc.1.gz", 4095) = 25
   lstat("/etc/alternatives/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=35, ...}) = 0
   readlink("/etc/alternatives/nc.1.gz", "/usr/share/man/man1/nc_openbsd.1"..., 4095) = 35
   lstat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
   access("/usr/share/man/man1/nc.1.gz", R_OK) = 0
   lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
   lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
   readlink("/usr/share/man/man1/nc.1.gz", "/etc/alternatives/nc.1.gz", 4095) = 25
   lstat("/etc/alternatives/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=35, ...}) = 0
   readlink("/etc/alternatives/nc.1.gz", "/usr/share/man/man1/nc_openbsd.1"..., 4095) = 35
   lstat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
   stat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   stat("/usr/share/man/cat1/nc.1.gz", 0x7fffa49c0940) = -1 ENOENT (No such file or directory)
   stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
   [pid  3878] stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
   [pid  3878] access("/usr/share/man/man1/nc_openbsd.1.gz", R_OK <unfinished ...>
   BSD                             March 20, 2018                             BSD
   

7. strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*"' | sort -u | grep -v /dev/ | xargs sh -c 'zgrep "March 14" "$@"' sh 2> /dev/null

    no output
   

   wygląda na to, że data nie jest zakodowana na stałe. Może to być makro generujące dzisiejszą datę.

8. env | grep -e ROFF -e MAN -e GRO

   SESSION_MANAGER=local/ychaouche-PC:@/tmp/.ICE-unix/2915,unix/ychaouche-PC:/tmp/.ICE-unix/2915
   MANDATORY_PATH=/usr/share/gconf/default.mandatory.path
   

9. env -i man nc pokazuje dzisiejszą datę (20 marca 2018)

10. zcat /usr/share/man/man1/nc_openbsd.1.gz | nroff -mandoc | grep BSD

    ychaouche#ychaouche-PC 06:59:53 ~ $ zcat /usr/share/man/man1/nc_openbsd.1.gz | nroff -mandoc | grep BSD
    NC(1)                     BSD General Commands Manual                    NC(1)
    BSD                             March 20, 2018                             BSD
    ychaouche#ychaouche-PC 07:01:41 ~ $
    

11. strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*tmac/[^"]*"' | sort -u | xargs ls -lrtd

    ychaouche#ychaouche-PC 17:26:08 /usr/share/man/man1 $ unalias ls
    ychaouche#ychaouche-PC 17:26:12 /usr/share/man/man1 $ unalias xargs
    ychaouche#ychaouche-PC 17:26:14 /usr/share/man/man1 $ unalias grep
    ychaouche#ychaouche-PC 17:26:16 /usr/share/man/man1 $ strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*tmac/[^"]*"' | sort -u | xargs ls -lrtd
    -rw-r--r-- 1 root root  4065 Jan 22  2014 /usr/share/groff/1.22.2/tmac/papersize.tmac
    -rw-r--r-- 1 root root  1860 Jan 22  2014 /usr/share/groff/1.22.2/tmac/andoc.tmac
    -rw-r--r-- 1 root root    71 Jan 22  2014 /usr/share/groff/1.22.2/tmac/unicode.tmac
    -rw-r--r-- 1 root root  1552 Jan 22  2014 /usr/share/groff/1.22.2/tmac/tty.tmac
    -rw-r--r-- 1 root root  5183 Jan 22  2014 /usr/share/groff/1.22.2/tmac/tty-char.tmac
    -rw-r--r-- 1 root root  1145 Jan 22  2014 /usr/share/groff/1.22.2/tmac/troffrc-end
    -rw-r--r-- 1 root root  1387 Jan 22  2014 /usr/share/groff/1.22.2/tmac/troffrc
    -rw-r--r-- 1 root root  4729 Jan 22  2014 /usr/share/groff/1.22.2/tmac/pspic.tmac
    -rw-r--r-- 1 root root 22042 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-syms
    -rw-r--r-- 1 root root  4048 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-nroff
    -rw-r--r-- 1 root root 29284 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-common
    -rw-r--r-- 1 root root  2250 Jan 22  2014 /usr/share/groff/1.22.2/tmac/latin1.tmac
    -rw-r--r-- 1 root root 27860 Jan 22  2014 /usr/share/groff/1.22.2/tmac/hyphen.us
    -rw-r--r-- 1 root root 15678 Jan 22  2014 /usr/share/groff/1.22.2/tmac/hyphenex.us
    -rw-r--r-- 1 root root  1362 Jan 22  2014 /usr/share/groff/1.22.2/tmac/fallbacks.tmac
    -rw-r--r-- 1 root root 73807 Jan 22  2014 /usr/share/groff/1.22.2/tmac/doc.tmac
    -rw-r--r-- 1 root root   537 Jan 22  2014 /usr/share/groff/1.22.2/tmac/composite.tmac
    -rw-r--r-- 1 root root   704 Jan 22  2014 /usr/share/groff/site-tmac/mdoc.local
    ychaouche#ychaouche-PC 17:26:18 /usr/share/man/man1 $
    

GNU roff nie wspierał tych:

 .Dd $Mdocdate: February 7 2012 $

Rozszerzenie OpenBSD (tutaj, które $Mdocdate: ...$jest słowem kluczowym CVS / RCS rozwiniętym przez CVS (którego OpenBSD używa do kontroli wersji ich kodu) z datą ręcznej zmiany), powodując rozszerzenie bieżącej daty zamiast podanej. Mogę go odtworzyć na Ubuntu 14.04 dla wszystkich stron podręcznika użytkownika, które mają takie Mdocdate.

Zobacz https://savannah.gnu.org/bugs/?42968 zaimplementowane w https://lists.gnu.org/archive/html/groff-commit/2014-10/msg00092.html (wersja Groff 1.22.3).

W przypadku stron podręcznika MirBSD (obecnie MirOS) takich jak twoje paxcpiolub mksh, które używają tego samego $Mdocdate: ...$słowa kluczowego CVS, strony podręcznika redefiniują (zawijają) .Ddmakro mdoc, więc makra systemu roff nie muszą go obsługiwać:

.\"
.\" Implement .Dd with the Mdocdate RCS keyword
.\"
.rn Dd xD
.de Dd
.ie ^G\\$1^G$Mdocdate:^G \{\
.       xD \\$2 \\$3, \\$4
.\}
.el .xD \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8
..
.\"
.\" .Dd must come before definition of .Mx, because when called
.\" with -mandoc, it might implement .Mx itself, but we want to
.\" use our own definition. And .Dd must come *first*, always.
.\"
.Dd $Mdocdate: August 16 2017 $