[libvirt] [PATCH] Added example script on how to convert LXC container config

[Cédric Bosdonnat]

---
 Makefile.am                          |  2 +-
 configure.ac                         |  1 +
 examples/lxcconvert/Makefile.am      | 19 ++++++++++
 examples/lxcconvert/virt-lxc-convert | 67 ++++++++++++++++++++++++++++++++++++
 4 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 examples/lxcconvert/Makefile.am
 create mode 100644 examples/lxcconvert/virt-lxc-convert

diff --git a/Makefile.am b/Makefile.am
index 9847ff0..0ef983f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ SUBDIRS = . gnulib/lib include src daemon tools docs gnulib/tests \
   tests po examples/object-events examples/hellolibvirt \
   examples/dominfo examples/domsuspend examples/apparmor \
   examples/xml/nwfilter examples/openauth examples/systemtap \
-  tools/wireshark
+  examples/lxcconvert tools/wireshark
 
 ACLOCAL_AMFLAGS = -I m4
 
diff --git a/configure.ac b/configure.ac
index 62b74c5..f970de0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2695,6 +2695,7 @@ AC_CONFIG_FILES([\
         examples/hellolibvirt/Makefile \
         examples/systemtap/Makefile \
         examples/xml/nwfilter/Makefile \
+        examples/lxcconvert/Makefile \
         tools/wireshark/Makefile \
         tools/wireshark/src/Makefile])
 AC_OUTPUT
diff --git a/examples/lxcconvert/Makefile.am b/examples/lxcconvert/Makefile.am
new file mode 100644
index 0000000..c5ae537
--- /dev/null
+++ b/examples/lxcconvert/Makefile.am
@@ -0,0 +1,19 @@
+## Copyright (C) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany. 
+##
+## This library is free software; you can redistribute it and/or
+## modify it under the terms of the GNU Lesser General Public
+## License as published by the Free Software Foundation; either
+## version 2.1 of the License, or (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public
+## License along with this library.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+EXTRA_DIST=				\
+	virt-lxc-convert
+
diff --git a/examples/lxcconvert/virt-lxc-convert b/examples/lxcconvert/virt-lxc-convert
new file mode 100644
index 0000000..ea32ff4
--- /dev/null
+++ b/examples/lxcconvert/virt-lxc-convert
@@ -0,0 +1,67 @@
+#!/usr/bin/env sh
+
+function show_help()
+{
+    cat << EOF
+$0 /path/to/lxc/config/file
+
+Wrapper around virsh domxml-from-native to ease conversion of LXC
+containers configuration to libvirt domain XML.
+EOF
+}
+
+if test "$#" != 1; then
+    show_help
+    exit 1
+fi
+
+conf=$1
+
+
+conf_new=/tmp/config-$$
+domain_new=/tmp/config-$$.xml
+
+cp $conf $conf_new
+
+# Do we have lxc.mount, and is it pointing to a readable file?
+fstab=`grep 'lxc.mount[[:space:]]*=' $conf_new | sed -e 's/[[:space:]]\+=[[:space:]]\+/=/' | cut -f 2 -d '='`
+if test \( -n "$fstab" \) -a \( -r "$fstab" \); then
+    sed -i -e 's/^lxc.mount[[:space:]]*=.*$//' $conf_new
+    sed -e 's/^\([^#]\)/lxc.mount.entry = \1/' $fstab | cat $conf_new - >${conf_new}.tmp
+    mv ${conf_new}.tmp $conf_new
+fi
+
+memory=`free | grep 'Mem:' | sed -e 's: \+: :g' | cut -f 2 -d ' '`
+default_tmpfs="size=$((memory/2))"
+
+# Do we have tmpfs without size param?
+grep -e 'lxc.mount.entry[[:space:]]*=[[:space:]]*tmpfs[[:space:]]' $conf_new | while read line; do
+    has_size=`echo $line | grep -v -e 'size='`
+    # Add the default size here (50%) if no size is given
+    if test -n "$has_size"; then
+        sed -i -e "\;$line;s/\([[:space:]]\+[0-9][[:space:]]\+[0-9][::space::]*$\)/,$default_tmpfs\1/" $conf_new
+    fi
+    # Convert relative sizes
+    has_rel_size=`echo $line | grep -e 'size=[0-9]\+%'`
+    if test -n "$has_rel_size"; then
+        percent=`echo "$line" | sed -e 's:size=\([0-9]\+\)%:\n\1%\n:' | grep '\%' | sed -e 's/%//'`
+        size="$((memory*percent/100))"
+        sed -i -e "\;$line;s/size=[0-9]\+%/size=${size}/" $conf_new
+    fi
+done
+
+# Do we have any memory limit set?
+mem_limit=`grep 'lxc.cgroup.memory.limit_in_bytes[[:space:]]*=' $conf_new`
+if test -z "$mem_limit"; then
+    sed -i -e "1s:^:lxc.cgroup.memory.limit_in_bytes = $memory\n:" $conf_new
+fi
+
+virsh -c lxc:/// domxml-from-native lxc-tools $conf_new >$domain_new
+
+cat $domain_new
+
+# Remove the temporary config
+rm $conf_new
+rm $domain_new
+
+exit 0
-- 
1.9.0