[game-data-packager] 06/14: make_template: add strace wrapper

[Simon McVittie]

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smcv pushed a commit to branch master
in repository game-data-packager.

commit 7e50e6da93dc079f0a14a6acf5da3e6e8b2e4ac9
Author: Alexandre Detiste <alexandre.detiste at gmail.com>
Date:   Thu Feb 12 06:02:21 2015 +0100

    make_template: add strace wrapper
    
    one just needs to complete one game to see which files are used,
    will tell also about missing files (ENOENT)
---
 game_data_packager/make_template.py | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/game_data_packager/make_template.py b/game_data_packager/make_template.py
index 2930807..614278e 100644
--- a/game_data_packager/make_template.py
+++ b/game_data_packager/make_template.py
@@ -267,14 +267,60 @@ def do_one_deb(deb):
     print('...')
     print('')
 
+def do_one_exec(pgm,lower):
+    with subprocess.Popen(['strace', '-e', 'open',
+                           '-s', '100', pgm],
+           stderr=subprocess.PIPE, stdout=subprocess.DEVNULL,
+           universal_newlines=True) as proc:
+        used = set()
+        missing = set()
+        while proc.poll() == None:
+            line = proc.stderr.readline().strip()
+            if not line.startswith('open('):
+                continue
+            file = line.split('"')[1]
+            if (not file.startswith('/usr/share/games')
+              and not file.startswith('/usr/local/games')):
+                continue
+            if 'ENOENT' in line:
+               missing.add(file)
+            else:
+               used.add(file)
+
+        dirs = set()
+        print('# used')
+        for file in sorted(used):
+            dirs.add(os.path.dirname(file))
+            print("    - %s" % file)
+        if missing:
+            print('# missing ?')
+            for file in sorted(missing):
+                print("    - %s" % file)
+
+        present = set()
+        for dir in dirs:
+            for dirpath, dirnames, filenames in os.walk(dir):
+                for fn in filenames:
+                    present.add(os.path.join(dirpath, fn))
+
+        unused = present - used
+        if unused:
+            print('# not used')
+            for file in sorted(unused):
+                print("    - %s" % file)
+
+
 def main():
     parser = argparse.ArgumentParser(
             description='Produce a template for game-data-packager YAML ' +
                 'based on an existing .deb file or installed directory',
             prog='game-data-packager guess-contents')
-    parser.add_argument('args', nargs='+', metavar='DEB|DIRECTORY')
+    parser.add_argument('args', nargs='+', metavar='DEB|DIRECTORY|FILE')
     parser.add_argument('-l', '--lower', action='store_true', dest='lower',
             help='make all files lowercase')
+    parser.add_argument('-e', '--execute', action='store_true', dest='execute',
+            help='run this game through strace and see which files from '
+                 '/usr/share/games or /usr/local/games are needed')
     args = parser.parse_args()
 
     for arg in args.args:
@@ -282,6 +328,8 @@ def main():
             do_one_dir(arg.rstrip('/'),args.lower)
         elif arg.endswith('.deb'):
             do_one_deb(arg)
+        elif args.execute:
+            do_one_exec(arg,args.lower)
         else:
             do_one_file(arg,args.lower)
 

-- 
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