Re: [Bug-tar] [GNU tar 1.26] testsuite: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 25 26 27 28 30 31 34 36 38 39 40 42 43 44 45 46 47 48 49 51 52 53 54 55 57 58 59 60 61 62 64 65 66 67 68 69 71 72 73 74 79 80 81 82 83 84 85 87 90 91 92

[Kevin Brott]

On Thu, Aug 18, 2011 at 11:25, Kevin Brott <address@hidden> wrote:

On Thu, Aug 18, 2011 at 10:28, Paul Eggert <address@hidden> wrote:

On 08/18/2011 09:46 AM, Kevin Brott wrote:
> Looks like tar isn't putting anything but zero-byte files into the archives

Thanks for the truss output.  I expect that it's this line
in src/create.c:1639

 else if (fstatat (parentfd, name, &st->stat, fstatat_flags) != 0)

Could you please run a debugger like GDB and step through that line
with an offending test case?  My suspicion is that fstatat is incorrectly
reporting that the file size is zero.  If so, can you explain how fstatat
is implemented on your system?  Is the code using the gnulib replacement,
or is fstatat implemented via system's C library, or what?

If you can't run a debugger, simply insert some printf statements
and print st->stat.st_size right after the successful fstatat.

Working on that debugging (using the system native tools because there's no working gcc for AIX 7.1 yet, and I'm not real familiar with adb or dbx) ... but doing some quick reading I suspect the issue stems from this:

"IBM AIX Version 7.1 Differences Guide" p7

Table 1-2 Short list of new library functions and system calls

System calls System calls

acessxat mknodat

chownxat openat

faccessat openxat

fchmodat readlinkat

fchownat renameat

fexecve stat64at

fstatat statx64at

futimens statxat

kopenat symlinkat

linkat ulinkat

mkdirat utimensat

mkfifoat

Which implies that fstatat wasn't available in earlier versions of AIX - but is now in 7.1 - which might end up just being a ./configure issue.  The official reference for it seems to be here: http://publib.boulder.ibm.com/infocenter/aix/v7r1/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf2/statx.htm

AIX dbx is not being my friend today. I'm not finding the data I think you're looking for. And my c-foo is apparently weak-sauce, as putting a simple printf in create.c resulted in a src/tar that segfaults.

Any chance you could pass a short .diff this way for create.c that would result in the data dump you want?

--
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/* Kevin  Brott <address@hidden> */