2011/4/2 Tomasz Czapiewski <[email protected]>:
Hi,
I have replaced BusyBox 1.2.1 with 1.18.1 yestarday on one embedded machine
and I've encountered problems using FISH connection from Midnight Commander
on PC to Dropbear SSH server on embedded machine.
All the file and dir names (including '.' and '..') are ending with:
'\"\ \ ' - quotation mark (interted commas) and two spaces.
Unfortunately I don't know how MC executes 'ls' command (which arguments).
I couldn't get the problematic output with 'ls' or 'ls -al' or other
arguments so can't track where's the problem myself.
BusyBox 1.18.1 (before upgrade, on 1.2.1 everything was fine)
Midnight Commander 4.7.0.6
On Saturday 02 April 2011 21:59, Tomasz Czapiewski wrote:
On Sat, 2 Apr 2011, Sergey Naumov wrote:
It seems that it is problem of new mc. I have similar problems with mc
from Debian 6.0.0 and openssh. mc from debian 5.0.0 works fine with my
busybox-based system.
Sergey Naumov.
Thanks for info, but I haven't upgraded MC in last few moths (it's default
one in Kubuntu 10.10) and it worked without any problems with older
BusyBox. I can only assume that there were any used by MC parameters which
older BusyBox was missing and MC haven't used them. Is there already known
workaround for this problem?
Here's the strace log from current connection (cut the key exchange and
password verification at the beginning):
http://www.mediafire.com/?zydc5kkqtb66o2c
$ grep 'execve.*ls' LOG-dropbear-fish-shell.log
860 execve("/bin/ls", ["ls", "-1", "/"], [/* 10 vars */] <unfinished ...>
861 execve("/bin/ls", ["ls", "-Q", "/"], [/* 10 vars */]) = 0
862 execve("/bin/ls", ["ls", "-Qlan", "/"], [/* 10 vars */] <unfinished ...>
865 execve("/bin/ls", ["ls", "-Qlan", "/"], [/* 10 vars */] <unfinished ...>
869 execve("/bin/ls", ["ls", "-1", "//bin"], [/* 10 vars */] <unfinished ...>
870 execve("/bin/ls", ["ls", "-Q", "//bin"], [/* 10 vars */]) = 0
871 execve("/bin/ls", ["ls", "-Qlan", "//bin"], [/* 10 vars */] <unfinished
...>
874 execve("/bin/ls", ["ls", "-Qlan", "//bin"], [/* 10 vars */] <unfinished
...>
878 execve("/bin/ls", ["ls", "-1", "//mnt"], [/* 10 vars */] <unfinished ...>
879 execve("/bin/ls", ["ls", "-Q", "//mnt"], [/* 10 vars */] <unfinished ...>
880 execve("/bin/ls", ["ls", "-Qlan", "//mnt"], [/* 10 vars */] <unfinished
...>
883 execve("/bin/ls", ["ls", "-Qlan", "//mnt"], [/* 10 vars */]) = 0
887 execve("/bin/ls", ["ls", "-1", "/tmp"], [/* 10 vars */] <unfinished ...>
888 execve("/bin/ls", ["ls", "-Q", "/tmp"], [/* 10 vars */]) = 0
889 execve("/bin/ls", ["ls", "-Qlan", "/tmp"], [/* 10 vars */] <unfinished
...>
892 execve("/bin/ls", ["ls", "-Qlan", "/tmp"], [/* 10 vars */] <unfinished
...>
897 execve("/bin/ls", ["ls", "-1", "/tmp/.stagecraft\" "], [/* 10 vars */]
<unfinished ...>
It uses -Q.
busybox 1.2.1 didn't have -Q at all. Probably mc was detecting that
and used some other method. Now it uses -Q (because it is supported, but isn't
happy with results.
Let's check how it ended up using '.stagecraft" '
$ grep 'stagecraft' LOG-dropbear-fish-shell.log
889 lstat64("/tmp/.stagecraft", {st_mode=S_IFDIR|0777, st_size=0, ...}) = 0
891 write(1, "Pdrwxrwxrwx 0.0\nS0\ndJan 1 00:00\n:\".stagecraft\" \n\n", 50)
= 50
892 lstat64("/tmp/.stagecraft", {st_mode=S_IFDIR|0777, st_size=0, ...}) = 0
855 write(7, "#LIST /tmp/.stagecraft\\\"\\ \\ \nif `perl -v > /dev/null 2>&1` ;
then\nperl -e '\nuse strict;\nuse POSIX;\n"..., 2216) = 2216
858 <... read resumed> "#LIST /tmp/.stagecraft\\\"\\ \\ \nif `perl -v > /dev/null
2>&1` ; then\nperl -e '\nuse strict;\nuse POSIX;\n"..., 1023) = 1023
858 read(0, "osedir(DIR);\n} else {\nprintf(\"### 500\\n\");\n}\nexit 0\n'
/tmp/.stagecraft\\\"\\ \\ ||\n echo '### 500'\n"..., 1023) = 1023
897 execve("/bin/ls", ["ls", "-1", "/tmp/.stagecraft\" "], [/* 10 vars */]
<unfinished ...>
897 lstat64("/tmp/.stagecraft\" ", 0x7fa51a38) = -1 ENOENT (No such file or
directory)
897 write(2, "ls: /tmp/.stagecraft\" : No such file or directory\n", 51) = 51
The second line above is fishy. Let's see where it comes from:
891 read(0, "d", 1) = 1
891 read(0, "r", 1) = 1
891 read(0, "w", 1) = 1
891 read(0, "x", 1) = 1
891 read(0, "r", 1) = 1
891 read(0, "w", 1) = 1
891 read(0, "x", 1) = 1
891 read(0, "r", 1) = 1
891 read(0, "w", 1) = 1
891 read(0, "x", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "3", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "J", 1) = 1
891 read(0, "a", 1) = 1
891 read(0, "n", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "1", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, ":", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, "0", 1) = 1
891 read(0, " ", 1) = 1
891 read(0, "\"", 1) = 1
891 read(0, ".", 1) = 1
891 read(0, "s", 1) = 1
891 read(0, "t", 1) = 1
891 read(0, "a", 1) = 1
891 read(0, "g", 1) = 1
891 read(0, "e", 1) = 1
891 read(0, "c", 1) = 1
891 read(0, "r", 1) = 1
891 read(0, "a", 1) = 1
891 read(0, "f", 1) = 1
891 read(0, "t", 1) = 1
891 read(0, "\"", 1) = 1
891 read(0, "\n", 1) = 1
891 waitpid(-1, 0x7f898c50, WNOHANG) = -1 ECHILD (No child processes)
891 waitpid(-1, 0x7f898c50, WNOHANG) = -1 ECHILD (No child processes)
891 waitpid(-1, 0x7f898c50, WNOHANG) = -1 ECHILD (No child processes)
891 waitpid(-1, 0x7f898c50, WNOHANG) = -1 ECHILD (No child processes)
891 fcntl64(1, F_GETFL) = 0x1 (flags O_WRONLY)
891 write(1, "Pdrwxrwxrwx 0.0\nS0\ndJan 1 00:00\n:\".stagecraft\" \n\n", 50)
= 50
I don't see what process 891 is (I see neither fork or clone which created it,
nor any execve's in it), but this is clearly where bug originates:
this process reads ls output (byte-by-byte), and then
translates it in some other format. This translation is buggy:
it took input in the form ".stagecraft" (quotes included)
and converted it to ".stagecraft"<space><space>
which looks wrong to me.
Aha. Looks like we have some docs:
http://cvs.savannah.gnu.org/viewvc/mc/mc/vfs/README.fish?view=markup
According to it, process 891 must be shell running "while read..."
part of the shell construct similar to:
ls -Qlan /tmp | grep '^[^cbt]' | ( while read p x u g s m d y n; do echo "P$p
$u.$g
S$s
d$m $d $y
:$n
"; done )
Questions for further debugging:
What is your shell?
Can you run this:
ls -Qlan /tmp | grep '^[^cbt]' | ( while read p x u g s m d y n; do echo "P$p
$u.$g
S$s
d$m $d $y
:$n
"; done ) >LOG
and post resulting LOG file?
