strace-log-merge: work around corner cases of strace -ttt parsing

Employing strace -ttt for the logs destined to be fed to
strace-log-merge is ultimately the best solution except for the logs
that pass the following dates:

Thu Jan  1 00:00:09 UTC 1970
Thu Jan  1 00:01:39 UTC 1970
Thu Jan  1 00:16:39 UTC 1970
Thu Jan  1 02:46:39 UTC 1970
Fri Jan  2 03:46:39 UTC 1970
Mon Jan 12 13:46:39 UTC 1970
Sun Apr 26 17:46:39 UTC 1970
Sat Mar  3 09:46:39 UTC 1973
Sun Sep  9 01:46:39 UTC 2001
Sat Nov 20 17:46:39 UTC 2286
Wed Nov 16 09:46:39 UTC 5138
Fri Sep 27 01:46:39 UTC 33658
Sun May 20 17:46:39 UTC 318857
Sat Nov  7 09:46:39 UTC 3170843
Sun Jul  5 01:46:39 UTC 31690708
Sat Jan 25 17:46:39 UTC 316889355

Let's lift this limitation.

* strace-log-merge: Generate numeric-only key for sorting, use sort -n
option.

diff --git a/strace-log-merge b/strace-log-merge
index 9791bb7b71227cf0797b38859fb275b5d1edaad0..fb95f7c4465c88deec0f0307efbf066441245c4b 100755 (executable)
--- a/strace-log-merge
+++ b/strace-log-merge
@@ -40,6 +40,9 @@ option which prints timestamps (otherwise sorting won't do any good).
 __EOF__
 }
 
+dd='\([0-9][0-9]\)'
+ds='\([0-9][0-9]*\)'
+
 if [ $# -ne 1 ]; then
        show_usage >&2
        exit 1
@@ -59,10 +62,10 @@ for file in "$logfile".*; do
        # Some strace logs have last line which is not '\n' terminated,
        # so add extra newline to every file.
        # grep -v '^$' removes empty lines which may result.
-       sed "s/^/$pid /" < "$file"
+       sed -n "s/^\($dd:\)\?\($dd:\)\?\($ds\.\)\?$ds /\2\4\6\7 $pid \0/p" < "$file"
        echo
 done \
-| sort -s -k2,2 | grep -v '^$'
+| sort -s -n -k1,1 | sed -n 's/^[0-9][0-9]* //p'
 
 rc=$?
 [ $rc -eq 1 ] &&