Add Bash libs collect.sh (pt-collect internals), safeguards.sh, and alt_cmds.sh.

lib/bash/safeguards.sh

@@ -0,0 +1,51 @@
+# This program is copyright 2011 Percona Inc.
+# Feedback and improvements are welcome.
+#
+# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation, version 2; OR the Perl Artistic License.  On UNIX and similar
+# systems, you can issue `man perlgpl' or `man perlartistic' to read these
+# licenses.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+# Place, Suite 330, Boston, MA  02111-1307  USA.
+# ###########################################################################
+# safeguards package
+# ###########################################################################
+
+# Package: safeguards
+# safeguards is a collection of function to help avoid blowing things up.
+
+set -u
+
+disk_space() {
+   local filesystem=${1:-"$PWD"}
+   # Filesystem    512-blocks       Used  Available  Capacity  Mounted on
+   # /dev/disk0s2   236306352  190223184   45571168       81%  /
+   df -m -P $filesystem
+}
+
+check_disk_space() {
+   local file=$1
+   local mb=${2:-"0"}
+   local pct=${3:-"0"}
+
+   local avail=$(cat $file | awk '/^\//{print $4}');
+   local full=$(cat $file  | awk '/^\//{print $5}' | sed -e 's/%//g');
+   if [ "${avail}" -le "$mb" -o "$full" -le "$pct" ]; then
+      echo "Not enough free space (${full}% full, ${avail}MB free)"
+      echo "Wanted less than ${pct}% full and more than ${mb}MB"
+      return 1
+   fi
+   return 0
+}
+
+
+# ###########################################################################
+# End safeguards package
+# ###########################################################################