>Number:         23776
>Category:       bin
>Synopsis:       
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 17 03:18:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Kirk Russell
>Release:        NetBSD 1.6
>Organization:
Kirk Russell                  Bridlewood Software Testers Guild
>Environment:
System: NetBSD greyhawk 1.6 NetBSD 1.6 (GREYHAWK) #0: Tue Nov 18 22:00:12 EST 2003 kirk@greyhawk:/usr/src/sys/arch/i386/compile/GREYHAWK i386
Architecture: i386
Machine: i386
>Description:
During August 1999 (after 1.4, but before 1.5) the leading "/" removal
feature was added to pax.   This feature appears to change how the
"-s replstr" feature works.  Now the NetBSD pax "-s replstr" behaviour
is different than other vendor's.  

With my example, the 1st stage of the pipeline will create a tar archive of
/etc/passwd, using the "-s replstr" feature to strip "/etc/" while the
2nd stage of the pipeline views the contents of the archive.  SunOS,
QNX6 and NetBSD's 1.4 pax all have the expected behaviour:

$ uname -a
SunOS saltmarsh 4.1.1_U1 2 sun3
$ pax -w -s 'T^/etc/TT' /etc/passwd  | pax -v
USTAR format archive
-rw-r--r--  0 root     staff         522 Sep 29 22:48 passwd

$ uname -a
SunOS nodes 5.8 Generic sun4u sparc SUNW,Ultra-5_10
$ pax -w -s 'T^/etc/TT' /etc/passwd  | pax -v
USTAR format archive
-r--r--r--  0 root     sys          761 Mar  3  2003 passwd

$ uname -a
QNX node18 6.2.1 2003/05/17-02:28:40edt x86pc x86
$ pax -w -s 'T^/etc/TT' /etc/passwd  | pax -v
USTAR format archive
-rw-r--r--  0 root     root          430 Jun 17 08:32 passwd

# this is a NetBSD 1.4 pax executable running under NetBSD 1.6
$ cksum ./bin/pax ; ls -l ./bin/pax
1498629648 262144 ./bin/pax
-r-xr-xr-x  1 kirk  techies  262144 Oct 31  2000 ./bin/pax 
$ ./bin/pax -w -s 'T^/etc/TT' /etc/passwd  | ./bin/pax -v  
-rw-r--r--  1 root     wheel       1044 Nov 20 17:28 passwd
pax: ustar vol 1, 1 files, 4096 bytes read, 0 bytes written in 1 secs (4096 bytes/sec)


Now with NetBSD 1.6, the behaviour is different because the replacement
didn't happen:

$ uname -a
NetBSD greyhawk 1.6 NetBSD 1.6 (GREYHAWK) #0: Tue Nov 18 22:00:12 EST 2003     kirk@greyhawk:/usr/src/sys/arch/i386/compile/GREYHAWK i386
$ pax -w -s 'T^/etc/TT' /etc/passwd  | pax -v 
pax: Removing leading / from absolute path names in the archive
-rw-r--r--  1 root     wheel       1044 Nov 20 17:28 etc/passwd
pax: ustar vol 1, 1 files, 4096 bytes read, 0 bytes written in 1 secs (4096 bytes/sec)

But this works:

greyhawk$ pax -A -w -s 'T^/etc/TT' /etc/passwd  | pax -v
-rw-r--r--  1 root     wheel       1044 Nov 20 17:28 passwd
pax: ustar vol 1, 1 files, 4096 bytes read, 0 bytes written in 1 secs (4096 bytes/sec)

So, it work appear the leading "/" removal is happening before the replacement
string processing.  I would guess the leading "/" removal should happen
after the replacement string processing, not before.  I think this is a bug
because I would expect the "-s replstr" feature work as it did before.
>How-To-Repeat:
$ pax -w -s 'T^/etc/TT' /etc/passwd  | pax -v 
pax: Removing leading / from absolute path names in the archive
-rw-r--r--  1 root     wheel       1044 Nov 20 17:28 etc/passwd
pax: ustar vol 1, 1 files, 4096 bytes read, 0 bytes written in 1 secs (4096 bytes/sec)
>Fix:
The work-a-round is to use the "-A" argument when using the "-s" argument.
The fix is to do the leading "/" removal after the replacement string
processing, not before.
>Release-Note:
>Audit-Trail:
>Unformatted: