pax does not exit with an error if the processed archive is truncated: # (cd / && tar zcf - bsd | dd count=128 2>/dev/null | tar tzf -) bsd gzip: stdin: Input/output error tar: End of archive volume 1 reached gzip: stdout: Broken pipe tar: Failed write to archive volume: 1: Broken pipe # echo $? 0
There's two ways to fix this. 1) take the exit code of gzip into account: Index: ar_io.c =================================================================== RCS file: /cvs/src/bin/pax/ar_io.c,v retrieving revision 1.44 diff -u -p -p -u -r1.44 ar_io.c --- ar_io.c 11 Jan 2014 05:36:26 -0000 1.44 +++ ar_io.c 28 Mar 2014 14:09:37 -0000 @@ -337,8 +337,11 @@ ar_close(void) (void)close(arfd); /* Do not exit before child to ensure data integrity */ - if (zpid > 0) + if (zpid > 0) { waitpid(zpid, &status, 0); + if (WIFEXITED(status) && WEXITSTATUS(status)) + exit_val = 1; + } if (vflag && (artyp == ISTAPE)) { (void)fputs("done.\n", listf); 2) call paxwarn with 1 on truncated reads. Which will also work for non-gzipped tar files. Index: ar_io.c =================================================================== RCS file: /cvs/src/bin/pax/ar_io.c,v retrieving revision 1.44 diff -u -p -p -u -r1.44 ar_io.c --- ar_io.c 11 Jan 2014 05:36:26 -0000 1.44 +++ ar_io.c 3 Apr 2014 22:04:07 -0000 @@ -567,7 +570,7 @@ ar_read(char *buf, int cnt) if (res < 0) syswarn(1, errno, "Failed read on archive volume %d", arvol); else - paxwarn(0, "End of archive volume %d reached", arvol); + paxwarn(1, "End of archive volume %d reached", arvol); return(res); } Is there a historic reason for this?