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This patch compresses all pp files with bzip

Adds three new interfaces.

+int semanage_module_install_file(semanage_handle_t *,
+                                const char *module_name);
+int semanage_module_upgrade_file(semanage_handle_t *,
+                                const char *module_name);
+int semanage_module_install_base_file(semanage_handle_t *,
+                                     const char *module_name);

These interfaces will read either compressed or uncompressed files and
store them as compressed files in
/etc/selinux/POLICY/targeted/modules/avtive/modules

New functions

bzip and bunzip, self explanatory.

map_file which will take either a compresses or uncompressed file and
return the uncompressed data as a memory mapped file.

dupfile, which takes an open file descriptor and a filename and
duplicates the open filedescriptor to the name.  (Used for copying
compressed files to the store.)

Contains previous patch to setup sandbox as links rather then copies.



Some stats:

system-config-selinux currently needs over 100 megabytes of disk space
to install policy packages, with these fixes we only

Fedora 9
# du -m -s /etc/selinux/targeted /usr/share/selinux/targeted/
40	/etc/selinux/targeted
48	/usr/share/selinux/targeted/

Fedora 10  With this patch
# du -m -s /etc/selinux/targeted /usr/share/selinux/targeted/
10	/etc/selinux/targeted
3	/usr/share/selinux/targeted/

This does not include the space savings in
/usr/share/selinux/targeted/modules/tmp

Which needs another 40Mb of disk.


It does slow down the semodule command slightly, running semodule on all
compressed policy packages in Fedora Targeted policy.

# time  semodule -b base.pp.bz2 -i ../*bz2

real	0m14.774s
user	0m13.528s
sys	0m0.883s

Previous commands without patches

# time semodule -b base.pp -i ../*.pp

real	0m13.063s
user	0m11.742s
sys	0m1.179s

Max Heap size, as reported by valgrind -tool=massif

valgrind --tool=massif  --massif-out-file=/tmp/old/massif-b
/usr/sbin/semodule -b /usr/share/selinux/targeted/tmp/base.pp -i
/usr/share/selinux/targeted/*.pp

Without Compression
117970697

With Compression
118459897


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