Cygwin 1.5.21 execvp fails when Windows PATH has empty element
Steven Doerfler
sgd-cygwin@lugaru.com
Wed Aug 2 06:29:00 GMT 2006
A Cygwin program run from cmd.exe fails to invoke another Cygwin via the
PATH, when the PATH contains an empty entry.
A Windows PATH environment variable might contain adjacent ; characters, as
in c:\dir1;;c:\dir2. This is normally a harmless error. (For most Windows
programs, an empty entry in the PATH doesn't mean to search the current
directory, as in Unix.) But this condition seems to cause functions like
execvp to fail with errno==2 under XP Pro SP2.
C:\e>set PATH=c:\cygwin\bin
C:\e>tar czfv foo.tgz *.txt
dumpinfo.txt
foo.jsp.txt
C:\e>set PATH=;c:\cygwin\bin
C:\e>tar czfv foo.tgz *.txt
dumpinfo.txt
tar (child): gzip: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
foo.jsp.txt
The problem isn't specific to tar. A trivial test program, emptypath.c,
attached, fails with error 2 on its execvp call:
c:\e>set path=;c:\cygwin\bin
c:\e>emptypath ls *.h
execvp failed: No such file or directory
c:\e>set path=c:\cygwin\bin
c:\e>emptypath ls *.h
asm.h [...valid ls output omitted...]
One workaround is to invoke programs via bash, instead of straight from
cmd.exe. When bash converts the PATH from Windows to Cygwin format, it
deletes these empty elements. The problem also doesn't occur if the empty
element appears in the PATH after the directory containing the desired
executable.
The problem still occurs if the PATH is set in Unix format:
C:\e>set PATH=:/usr/bin
C:\e>\cygwin\bin\tar czfv foo.tgz *.txt
dumpinfo.txt
tar (child): gzip: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
foo.jsp.txt
C:\e>set PATH=/usr/bin
C:\e>\cygwin\bin\tar czfv foo.tgz *.txt
dumpinfo.txt
foo.jsp.txt
This problem did not occur initially on a second XP Pro SP2 machine running
Cygwin 1.5.19. Updating that machine to 1.5.21 made the problem appear.
Is this a known bug? Thanks in advance for any responses.
Steven Doerfler
Lugaru Software, Ltd.
http://www.lugaru.com
-------------- next part --------------
#include <unistd.h>
#include <stdio.h>
main(int argc, char *argv[])
{
argv++;
if (execvp(*argv, argv) == -1)
perror("execvp failed");
exit(0);
}
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Cygwin Configuration Diagnostics
Current System Time: Wed Aug 02 00:32:28 2006
Windows XP Professional Ver 5.1 Build 2600 Service Pack 2
Path: .
c:\cygwin\bin
Output from C:\cygwin\bin\id.exe (nontsec)
UID: 1005(Steven Doerfler) GID: 513(None)
0(root) 513(None)
544(Administrators) 545(Users)
Output from C:\cygwin\bin\id.exe (ntsec)
UID: 1005(Steven Doerfler) GID: 513(None)
0(root) 513(None)
544(Administrators) 545(Users)
SysDir: C:\WINDOWS\system32
WinDir: C:\WINDOWS
Path = ';c:\cygwin\bin'
ALLUSERSPROFILE = 'C:\Documents and Settings\All Users'
APPDATA = 'C:\Documents and Settings\Steven Doerfler\Application Data'
CLASSPATH = '.;C:\Program Files\Java\jre1.5.0_06\lib\ext\QTJava.zip'
CLIENTNAME = 'Console'
CommonProgramFiles = 'C:\Program Files\Common Files'
ComSpec = 'C:\WINDOWS\system32\cmd.exe'
HOMEDRIVE = 'C:'
HOMEPATH = '\Documents and Settings\Steven Doerfler'
NUMBER_OF_PROCESSORS = '2'
OS = 'Windows_NT'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
PROCESSOR_ARCHITECTURE = 'x86'
PROCESSOR_IDENTIFIER = 'x86 Family 15 Model 4 Stepping 1, GenuineIntel'
PROCESSOR_LEVEL = '15'
PROCESSOR_REVISION = '0401'
ProgramFiles = 'C:\Program Files'
PROMPT = '$P$G'
QTJAVA = 'C:\Program Files\Java\jre1.5.0_06\lib\ext\QTJava.zip'
RSYNC_RSH = '/usr/bin/ssh'
SESSIONNAME = 'Console'
SystemDrive = 'C:'
SystemRoot = 'C:\WINDOWS'
USERDOMAIN = 'DELL4700'
USERNAME = 'Steven Doerfler'
USERPROFILE = 'C:\Documents and Settings\Steven Doerfler'
windir = 'C:\WINDOWS'
POSIXLY_CORRECT = '1'
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
(default) = '/cygdrive'
cygdrive flags = 0x00000022
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/
(default) = 'C:\cygwin'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
(default) = 'C:\cygwin/bin'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
(default) = 'C:\cygwin/lib'
flags = 0x0000000a
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
a: fd N/A N/A
c: hd NTFS 148962Mb 54% CP CS UN PA FC
d: cd N/A N/A
e: cd N/A N/A
f: hd FAT32 76279Mb 100% CP UN EDGE_DISKGO
o: net NTFS 24732Mb 29% CP CS UN PA FC IBM_PRELOAD
C:\cygwin / system binmode
C:\cygwin/bin /usr/bin system binmode
C:\cygwin/lib /usr/lib system binmode
. /cygdrive system binmode,cygdrive
Found: c:\cygwin\bin\awk.exe
Found: c:\cygwin\bin\bash.exe
Found: c:\cygwin\bin\cat.exe
Found: c:\cygwin\bin\cp.exe
Found: c:\cygwin\bin\cpp.exe
Not Found: crontab
Found: c:\cygwin\bin\find.exe
Found: c:\cygwin\bin\gcc.exe
Not Found: gdb
Found: c:\cygwin\bin\grep.exe
Found: c:\cygwin\bin\kill.exe
Found: c:\cygwin\bin\ld.exe
Found: c:\cygwin\bin\ls.exe
Found: c:\cygwin\bin\make.exe
Found: c:\cygwin\bin\mv.exe
Not Found: patch
Found: c:\cygwin\bin\perl.exe
Found: c:\cygwin\bin\rm.exe
Found: c:\cygwin\bin\sed.exe
Found: c:\cygwin\bin\ssh.exe
Found: c:\cygwin\bin\sh.exe
Found: c:\cygwin\bin\tar.exe
Found: c:\cygwin\bin\test.exe
Not Found: vi
Not Found: vim
802k 2003/09/15 c:\cygwin\bin\cygaspell-15.dll - os=4.0 img=1.0 sys=4.0
"cygaspell-15.dll" v0.0 ts=2003/9/15 8:32
56k 2005/07/09 c:\cygwin\bin\cygbz2-1.dll - os=4.0 img=1.0 sys=4.0
"cygbz2-1.dll" v0.0 ts=2005/7/9 1:09
7k 2005/11/20 c:\cygwin\bin\cygcharset-1.dll - os=4.0 img=1.0 sys=4.0
"cygcharset-1.dll" v0.0 ts=2005/11/19 21:24
7k 2003/10/19 c:\cygwin\bin\cygcrypt-0.dll - os=4.0 img=1.0 sys=4.0
"cygcrypt-0.dll" v0.0 ts=2003/10/19 3:57
1108k 2006/06/01 c:\cygwin\bin\cygcrypto-0.9.7.dll - os=4.0 img=1.0 sys=4.0
"cygcrypto-0.9.7.dll" v0.0 ts=2006/6/1 11:50
1050k 2006/06/01 c:\cygwin\bin\cygcrypto-0.9.8.dll - os=4.0 img=1.0 sys=4.0
"cygcrypto-0.9.8.dll" v0.0 ts=2006/6/1 12:08
895k 2004/04/28 c:\cygwin\bin\cygdb-4.2.dll - os=4.0 img=1.0 sys=4.0
"cygdb-4.2.dll" v0.0 ts=2004/4/27 11:31
965k 2005/05/14 c:\cygwin\bin\cygdb-4.3.dll - os=4.0 img=1.0 sys=4.0
"cygdb-4.3.dll" v0.0 ts=2005/5/14 8:37
1156k 2004/04/28 c:\cygwin\bin\cygdb_cxx-4.2.dll - os=4.0 img=1.0 sys=4.0
"cygdb_cxx-4.2.dll" v0.0 ts=2004/4/27 11:35
1240k 2005/05/14 c:\cygwin\bin\cygdb_cxx-4.3.dll - os=4.0 img=1.0 sys=4.0
"cygdb_cxx-4.3.dll" v0.0 ts=2005/5/14 8:41
174k 2004/10/14 c:\cygwin\bin\cygexpat-0.dll - os=4.0 img=1.0 sys=4.0
"cygexpat-0.dll" v0.0 ts=2004/10/14 4:34
129k 2004/03/11 c:\cygwin\bin\cygfontconfig-1.dll - os=4.0 img=1.0 sys=4.0
"cygfontconfig-1.dll" v0.0 ts=2004/3/10 19:12
40k 2006/03/24 c:\cygwin\bin\cygform-8.dll - os=4.0 img=1.0 sys=4.0
"cygform-8.dll" v0.0 ts=2006/3/24 2:16
45k 2001/04/25 c:\cygwin\bin\cygform5.dll - os=4.0 img=1.0 sys=4.0
"cygform5.dll" v0.0 ts=2001/4/25 1:28
35k 2002/01/09 c:\cygwin\bin\cygform6.dll - os=4.0 img=1.0 sys=4.0
"cygform6.dll" v0.0 ts=2002/1/9 1:03
48k 2003/08/09 c:\cygwin\bin\cygform7.dll - os=4.0 img=1.0 sys=4.0
"cygform7.dll" v0.0 ts=2003/8/9 5:25
375k 2005/09/06 c:\cygwin\bin\cygfreetype-6.dll - os=4.0 img=1.0 sys=4.0
"cygfreetype-6.dll" v0.0 ts=2005/9/6 18:51
28k 2003/07/20 c:\cygwin\bin\cyggdbm-3.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm-3.dll" v0.0 ts=2003/7/20 3:58
30k 2003/08/11 c:\cygwin\bin\cyggdbm-4.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm-4.dll" v0.0 ts=2003/8/10 22:12
19k 2003/03/22 c:\cygwin\bin\cyggdbm.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm.dll" v0.0 ts=2002/2/19 22:05
15k 2003/07/20 c:\cygwin\bin\cyggdbm_compat-3.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm_compat-3.dll" v0.0 ts=2003/7/20 4:00
15k 2003/08/11 c:\cygwin\bin\cyggdbm_compat-4.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm_compat-4.dll" v0.0 ts=2003/8/10 22:13
17k 2001/06/28 c:\cygwin\bin\cyghistory4.dll - os=4.0 img=1.0 sys=4.0
"cyghistory4.dll" v0.0 ts=2001/1/6 23:34
29k 2003/08/10 c:\cygwin\bin\cyghistory5.dll - os=4.0 img=1.0 sys=4.0
"cyghistory5.dll" v0.0 ts=2003/8/10 19:16
24k 2006/03/25 c:\cygwin\bin\cyghistory6.dll - os=4.0 img=1.0 sys=4.0
"cyghistory6.dll" v0.0 ts=2006/3/25 9:05
947k 2005/11/20 c:\cygwin\bin\cygiconv-2.dll - os=4.0 img=1.0 sys=4.0
"cygiconv-2.dll" v0.0 ts=2005/11/19 21:24
22k 2001/12/13 c:\cygwin\bin\cygintl-1.dll - os=4.0 img=1.0 sys=4.0
"cygintl-1.dll" v0.0 ts=2001/12/13 4:28
37k 2003/08/10 c:\cygwin\bin\cygintl-2.dll - os=4.0 img=1.0 sys=4.0
"cygintl-2.dll" v0.0 ts=2003/8/10 17:50
31k 2005/11/20 c:\cygwin\bin\cygintl-3.dll - os=4.0 img=1.0 sys=4.0
"cygintl-3.dll" v0.0 ts=2005/11/19 21:04
21k 2001/06/20 c:\cygwin\bin\cygintl.dll - os=4.0 img=1.0 sys=4.0
"cygintl.dll" v0.0 ts=2001/6/20 13:09
21k 2006/03/24 c:\cygwin\bin\cygmenu-8.dll - os=4.0 img=1.0 sys=4.0
"cygmenu-8.dll" v0.0 ts=2006/3/24 2:16
26k 2001/04/25 c:\cygwin\bin\cygmenu5.dll - os=4.0 img=1.0 sys=4.0
"cygmenu5.dll" v0.0 ts=2001/4/25 1:27
20k 2002/01/09 c:\cygwin\bin\cygmenu6.dll - os=4.0 img=1.0 sys=4.0
"cygmenu6.dll" v0.0 ts=2002/1/9 1:03
29k 2003/08/09 c:\cygwin\bin\cygmenu7.dll - os=4.0 img=1.0 sys=4.0
"cygmenu7.dll" v0.0 ts=2003/8/9 5:25
21k 2004/10/22 c:\cygwin\bin\cygminires.dll - os=4.0 img=1.0 sys=4.0
"cygminires.dll" v0.0 ts=2004/10/22 16:28
67k 2006/03/24 c:\cygwin\bin\cygncurses++-8.dll - os=4.0 img=1.0 sys=4.0
"cygncurses++-8.dll" v0.0 ts=2006/3/24 2:17
156k 2001/04/25 c:\cygwin\bin\cygncurses++5.dll - os=4.0 img=1.0 sys=4.0
"cygncurses++5.dll" v0.0 ts=2001/4/25 1:29
175k 2002/01/09 c:\cygwin\bin\cygncurses++6.dll - os=4.0 img=1.0 sys=4.0
"cygncurses++6.dll" v0.0 ts=2002/1/9 1:03
227k 2006/03/24 c:\cygwin\bin\cygncurses-8.dll - os=4.0 img=1.0 sys=4.0
"cygncurses-8.dll" v0.0 ts=2006/3/23 23:51
226k 2001/04/25 c:\cygwin\bin\cygncurses5.dll - os=4.0 img=1.0 sys=4.0
"cygncurses5.dll" v0.0 ts=2001/4/25 1:17
202k 2002/01/09 c:\cygwin\bin\cygncurses6.dll - os=4.0 img=1.0 sys=4.0
"cygncurses6.dll" v0.0 ts=2002/1/9 1:03
224k 2003/08/09 c:\cygwin\bin\cygncurses7.dll - os=4.0 img=1.0 sys=4.0
"cygncurses7.dll" v0.0 ts=2003/8/9 5:24
91k 2005/11/24 c:\cygwin\bin\cygneon-24.dll - os=4.0 img=1.0 sys=4.0
"cygneon-24.dll" v0.0 ts=2005/11/24 7:21
90k 2006/01/25 c:\cygwin\bin\cygneon-25.dll - os=4.0 img=1.0 sys=4.0
"cygneon-25.dll" v0.0 ts=2006/1/25 6:02
12k 2006/03/24 c:\cygwin\bin\cygpanel-8.dll - os=4.0 img=1.0 sys=4.0
"cygpanel-8.dll" v0.0 ts=2006/3/24 2:16
15k 2001/04/25 c:\cygwin\bin\cygpanel5.dll - os=4.0 img=1.0 sys=4.0
"cygpanel5.dll" v0.0 ts=2001/4/25 1:27
12k 2002/01/09 c:\cygwin\bin\cygpanel6.dll - os=4.0 img=1.0 sys=4.0
"cygpanel6.dll" v0.0 ts=2002/1/9 1:03
19k 2003/08/09 c:\cygwin\bin\cygpanel7.dll - os=4.0 img=1.0 sys=4.0
"cygpanel7.dll" v0.0 ts=2003/8/9 5:24
109k 2006/02/10 c:\cygwin\bin\cygpcre-0.dll - os=4.0 img=1.0 sys=4.0
"cygpcre-0.dll" v0.0 ts=2006/2/9 21:37
299k 2006/02/10 c:\cygwin\bin\cygpcrecpp-0.dll - os=4.0 img=1.0 sys=4.0
"cygpcrecpp-0.dll" v0.0 ts=2006/2/9 21:38
7k 2006/02/10 c:\cygwin\bin\cygpcreposix-0.dll - os=4.0 img=1.0 sys=4.0
"cygpcreposix-0.dll" v0.0 ts=2006/2/9 21:37
1249k 2005/12/30 c:\cygwin\bin\cygperl5_8.dll - os=4.0 img=1.0 sys=4.0
"cygperl5_8.dll" v0.0 ts=2005/12/29 20:48
22k 2002/06/09 c:\cygwin\bin\cygpopt-0.dll - os=4.0 img=1.0 sys=4.0
"cygpopt-0.dll" v0.0 ts=2002/6/9 1:45
108k 2001/06/28 c:\cygwin\bin\cygreadline4.dll - os=4.0 img=1.0 sys=4.0
"cygreadline4.dll" v0.0 ts=2001/1/6 23:34
148k 2003/08/10 c:\cygwin\bin\cygreadline5.dll - os=4.0 img=1.0 sys=4.0
"cygreadline5.dll" v0.0 ts=2003/8/10 19:16
152k 2006/03/25 c:\cygwin\bin\cygreadline6.dll - os=4.0 img=1.0 sys=4.0
"cygreadline6.dll" v0.0 ts=2006/3/25 9:05
230k 2006/06/01 c:\cygwin\bin\cygssl-0.9.7.dll - os=4.0 img=1.0 sys=4.0
"cygssl-0.9.7.dll" v0.0 ts=2006/6/1 11:50
214k 2006/06/01 c:\cygwin\bin\cygssl-0.9.8.dll - os=4.0 img=1.0 sys=4.0
"cygssl-0.9.8.dll" v0.0 ts=2006/6/1 12:08
228k 2005/08/15 c:\cygwin\bin\cygt1-5.dll - os=4.0 img=1.0 sys=4.0
"cygt1-5.dll" v0.0 ts=2005/8/15 10:44
1065k 2006/06/09 c:\cygwin\bin\cygxml2-2.dll - os=4.0 img=1.0 sys=4.0
"cygxml2-2.dll" v0.0 ts=2006/6/9 15:10
65k 2005/08/23 c:\cygwin\bin\cygz.dll - os=4.0 img=1.0 sys=4.0
"cygz.dll" v0.0 ts=2005/8/22 22:03
1831k 2006/07/30 c:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
"cygwin1.dll" v0.0 ts=2006/7/30 14:21
Cygwin DLL version info:
DLL version: 1.5.21
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 156
Shared data: 4
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Sun Jul 30 14:21:47 EDT 2006
Shared id: cygwin1S4
No Cygwin services found.
Cygwin Package Information
Last downloaded files to: C:\cygwin
Last downloaded files from: http://mirrors.kernel.org/sourceware/cygwin
Package Version
_update-info-dir 00416-1
alternatives 1.3.20a-2
ash 20040127-3
aspell 0.50.3-1
aspell-doc 0.50.3-1
aspell-en 0.51.0-1
base-files 3.7-1
base-passwd 2.2-1
bash 3.1-6
binutils 20060709-1
bzip2 1.0.3-1
cadaver 0.22.3-1
coreutils 5.97-1
crypt 1.1-1
cygrunsrv 1.17-1
cygutils 1.3.0-1
cygwin 1.5.21-2
cygwin-doc 1.4-3
cygwin-x-doc 1.0.4-1
diffutils 2.8.7-1
editrights 1.01-1
expat 1.95.8-1
findutils 4.3.0-2
fontconfig 2.2.2-1
freetype2 2.1.9-1
gawk 3.1.5-4
gcc-core 3.4.4-1
gcc-g++ 3.4.4-1
gcc-mingw-core 20050522-1
gcc-mingw-g++ 20050522-1
gdbm 1.8.3-7
gettext 0.14.5-1
grep 2.5.1a-2
groff 1.18.1-2
gzip 1.3.5-2
less 381-1
lesstif 0.94.4-1
libaspell15 0.50.3-1
libbz2_1 1.0.3-1
libcharset1 1.9.2-2
libdb4.2 4.2.52-1
libdb4.3 4.3.28-1
libfontconfig1 2.2.2-1
libfreetype26 2.1.9-1
libgdbm 1.8.0-5
libgdbm-devel 1.8.3-7
libgdbm3 1.8.3-3
libgdbm4 1.8.3-7
libiconv 1.9.2-2
libiconv2 1.9.2-2
libintl 0.10.38-3
libintl1 0.10.40-1
libintl2 0.12.1-3
libintl3 0.14.5-1
libncurses-devel 5.5-2
libncurses5 5.2-1
libncurses6 5.2-8
libncurses7 5.3-4
libncurses8 5.5-2
libneon24 0.24.7-2
libneon25 0.25.5-1
libpcre 4.1-2
libpcre0 6.6-1
libpopt0 1.6.4-4
libreadline4 4.1-2
libreadline5 4.3-5
libreadline6 5.1-5
libXft 2.1.6-1
libXft1 1.0.0-1
libXft2 2.1.6-1
libxml2 2.6.26-1
login 1.9-7
make 3.81-1
man 1.5p-1
mingw-runtime 3.10-1
minires 1.00-1
mktemp 1.5-3
ncurses 5.5-2
openssh 4.3p2-3
openssl 0.9.8b-1
openssl097 0.9.7j-1
pcre 6.6-1
pcre-devel 6.6-1
pcre-doc 6.6-1
perl 5.8.7-5
perl-ExtUtils-Depends 0.205-1
perl-ExtUtils-PkgConfig 1.07-1
perl_manpages 5.8.7-5
pkg-config 0.20-1
pkgconfig 0.17.2-3
psutils 1.17-1
readline 5.1-5
rsync 2.6.6-1
run 1.1.10-1
sed 4.1.5-1
t1lib 5.1.0-1
tar 1.15.91-1
termcap 20050421-1
terminfo 5.5_20060323-1
texinfo 4.8-3
unzip 5.50-5
w32api 3.7-1
wget 1.10.2-1
which 1.7-1
X-startup-scripts 1.0.11-1
xorg-x11-base 6.8.99.901-1
xorg-x11-bin 6.8.99.901-1
xorg-x11-bin-dlls 6.8.99.901-1
xorg-x11-bin-lndir 6.8.99.901-1
xorg-x11-etc 6.8.99.901-1
xorg-x11-fenc 6.8.99.901-1
xorg-x11-fnts 6.8.99.901-1
xorg-x11-libs-data 6.8.99.901-1
xorg-x11-xwin 6.8.99.901-1
xterm 202-1
xwinclip 1.2.0-1
zlib 1.2.3-1
Use -h to see help about each section
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