[PATCHv2,3/4] support/scripts: add size-stats script

diff --git a/support/scripts/size-stats b/support/scripts/size-stats
new file mode 100755
index 0000000..7dc28a0
--- /dev/null
+++ b/support/scripts/size-stats
@@ -0,0 +1,225 @@ 
+#!/usr/bin/env python
+
+# Copyright (C) 2014 by Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+# 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; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+# 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
+
+import sys
+import os
+import os.path
+import argparse
+import csv
+
+try:
+    import matplotlib.font_manager as fm
+    import matplotlib.pyplot as plt
+except ImportError:
+    sys.stderr.write("You need python-matplotlib to generate the size graph\n")
+    exit(1)
+
+colors = ['#e60004', '#009836', '#2e1d86', '#ffed00',
+          '#0068b5', '#f28e00', '#940084', '#97c000']
+
+#
+# This function returns a dict containing as keys the files present in
+# the filesystem skeleton, and as value, the string "skeleton". It is
+# used to simulate a fake "skeleton" package, to assign the files from
+# the skeleton to some package.
+#
+# builddir: path to the Buildroot output directory
+#
+def build_skeleton_dict(builddir):
+    skeleton_files = {}
+    for root, _, files in os.walk("system/skeleton"):
+        for f in files:
+            if f == ".empty":
+                continue
+            frelpath = os.path.relpath(os.path.join(root, f), "system/skeleton")
+            # Get the real size of the installed file
+            targetpath = os.path.join(builddir, "target", frelpath)
+            if os.path.islink(targetpath):
+                continue
+            sz = os.stat(targetpath).st_size
+            skeleton_files[frelpath] = { 'pkg': "skeleton", 'size': sz }
+    return skeleton_files
+
+#
+# This function returns a dict where each key is the path of a file in
+# the root filesystem, and the value is a dict containing two
+# elements: the name of the package to which this file belongs (key:
+# pkg) and the size of the file (key: size).
+#
+# builddir: path to the Buildroot output directory
+#
+def build_package_dict(builddir):
+    pkgdict = {}
+    with open(os.path.join(builddir, "build", "packages-file-list.txt")) as filelistf:
+        for l in filelistf.readlines():
+            f = l.split(",")
+            fpath = f[1].strip().replace("./", "")
+            fullpath = os.path.join(builddir, "target", fpath)
+            if not os.path.exists(fullpath):
+                continue
+            pkg = f[0]
+            sz = os.stat(fullpath).st_size
+            pkgdict[fpath] = { 'pkg': pkg, 'size': sz }
+    pkgdict.update(build_skeleton_dict(builddir))
+    return pkgdict
+
+#
+# This function builds a dictionary that contains the name of a
+# package as key, and the size of the files installed by this package
+# as the value.
+#
+# pkgdict: dictionary with the name of the files as key, and as value
+# a dict containing the name of the package to which the files
+# belongs, and the size of the file. As returned by
+# build_package_dict.
+#
+# builddir: path to the Buildroot output directory
+#
+def build_package_size(pkgdict, builddir):
+    pkgsize = {}
+
+    for root, _, files in os.walk(os.path.join(builddir, "target")):
+        for f in files:
+            fpath = os.path.join(root, f)
+            if os.path.islink(fpath):
+                continue
+            frelpath = os.path.relpath(fpath, os.path.join(builddir, "target"))
+            if not frelpath in pkgdict:
+                print("WARNING: %s is not part of any package" % frelpath)
+                pkg = "unknown"
+            else:
+                pkg = pkgdict[frelpath]["pkg"]
+
+            if pkg in pkgsize:
+                pkgsize[pkg] += os.path.getsize(fpath)
+            else:
+                pkgsize[pkg] = os.path.getsize(fpath)
+
+    return pkgsize
+
+#
+# Given a dict returned by build_package_size(), this function
+# generates a pie chart of the size installed by each package.
+#
+# pkgsize: dictionary with the name of the package as a key, and the
+# size as the value, as returned by build_package_size.
+#
+# outputf: output file for the graph
+#
+def draw_graph(pkgsize, outputf):
+    total = 0
+    for (p, sz) in pkgsize.items():
+        total += sz
+    labels = []
+    values = []
+    other_value = 0
+    for (p, sz) in pkgsize.items():
+        if sz < (total * 0.01):
+            other_value += sz
+        else:
+            labels.append("%s (%d kB)" % (p, sz / 1000.))
+            values.append(sz)
+    labels.append("Other (%d kB)" % (other_value / 1000.))
+    values.append(other_value)
+
+    plt.figure()
+    patches, texts, autotexts = plt.pie(values, labels=labels,
+                                        autopct='%1.1f%%', shadow=True,
+                                        colors=colors)
+    # Reduce text size
+    proptease = fm.FontProperties()
+    proptease.set_size('xx-small')
+    plt.setp(autotexts, fontproperties=proptease)
+    plt.setp(texts, fontproperties=proptease)
+
+    plt.title('Size per package')
+    plt.savefig(outputf)
+
+#
+# Generate a CSV file with statistics about the size of each file, its
+# size contribution to the package and to the overall system.
+#
+# pkgdict: dictionary with the name of the files as key, and as value
+# a dict containing the name of the package to which the files
+# belongs, and the size of the file. As returned by
+# build_package_dict.
+#
+# pkgsize: dictionary with the name of the package as a key, and the
+# size as the value, as returned by build_package_size.
+#
+# outputf: output CSV file
+#
+def gen_files_csv(pkgdict, pkgsizes, outputf):
+    total = 0
+    for (p, sz) in pkgsizes.items():
+        total += sz
+    with open(outputf, 'w') as csvfile:
+        wr = csv.writer(csvfile, delimiter=',', quoting=csv.QUOTE_MINIMAL)
+        wr.writerow(["File name",
+                     "Package name",
+                     "File size",
+                     "Package size",
+                     "File size in package (%)",
+                     "File size in system (%)"])
+        for (f, info) in pkgdict.items():
+            pkgname = info["pkg"]
+            filesize = info["size"]
+            pkgsize = pkgsizes[pkgname]
+            wr.writerow([f, pkgname, filesize, pkgsize, "%.4f" % (float(filesize) / pkgsize * 100), "%.4f" % (float(filesize) / total * 100)])
+
+
+#
+# Generate a CSV file with statistics about the size of each package,
+# and their size contribution to the overall system.
+#
+# pkgsize: dictionary with the name of the package as a key, and the
+# size as the value, as returned by build_package_size.
+#
+# outputf: output CSV file
+#
+def gen_packages_csv(pkgsizes, outputf):
+    total = 0
+    for (p, sz) in pkgsizes.items():
+        total += sz
+    with open(outputf, 'w') as csvfile:
+        wr = csv.writer(csvfile, delimiter=',', quoting=csv.QUOTE_MINIMAL)
+        wr.writerow(["Package name", "Package size", "Package size in system (%)"])
+        for (pkg, size) in pkgsizes.items():
+            wr.writerow([pkg, size, "%.4f" % (float(size) / total * 100)])
+
+parser = argparse.ArgumentParser(description='Draw build time graphs')
+
+parser.add_argument("--builddir", '-i', metavar="BUILDDIR", required=True,
+                    help="Buildroot output directory")
+parser.add_argument("--graph", '-g', metavar="GRAPH",
+                    help="Graph output file (.pdf or .png extension)")
+parser.add_argument("--file-size-csv", '-f', metavar="FILE_SIZE_CSV",
+                    help="CSV output file with file size statistics")
+parser.add_argument("--package-size-csv", '-p', metavar="PKG_SIZE_CSV",
+                    help="CSV output file with package size statistics")
+args = parser.parse_args()
+
+pkgdict = build_package_dict(args.builddir)
+pkgsize = build_package_size(pkgdict, args.builddir)
+
+if args.graph:
+    draw_graph(pkgsize, args.graph)
+if args.file_size_csv:
+    gen_files_csv(pkgdict, pkgsize, args.file_size_csv)
+if args.package_size_csv:
+    gen_packages_csv(pkgsize, args.package_size_csv)