add code for creating an in-memory cpio archive, that I wrote a long time ago when we were planning to send RPM requires and provides of local binary packages to the backend for processing, along with spec files

osc/cpio.py

@@ -0,0 +1,66 @@
+#!/usr/bin/python
+
+import struct, sys
+
+class Cpio:
+    """cpio archive small files in memory, using new style portable header format"""
+
+    def __init__(self):
+        self.cpio = ''
+
+    def add(self, name=None, content=None):
+        namesize = len(name) + 1
+        if namesize % 2:
+            name += '\0'
+        filesize = len(content)
+
+        c = []
+        c.append('070701') # magic
+        c.append('%08X' % 0) # inode
+        c.append('%08X' % 0) # mode
+        c.append('%08X' % 0) # uid
+        c.append('%08X' % 0) # gid
+        c.append('%08X' % 0) # nlink
+        c.append('%08X' % 0) # mtime
+        c.append('%08X' % filesize)
+        c.append('%08X' % 0) # major
+        c.append('%08X' % 0) # minor
+        c.append('%08X' % 0) # rmajor
+        c.append('%08X' % 0) # rminor
+        c.append('%08X' % namesize)
+        c.append('%08X' % 0) # checksum
+
+        c.append(name + '\0')
+        c.append('\0' * (len(''.join(c)) % 4))
+
+        c.append(content)
+    
+        c = ''.join(c)
+        sys.stderr.write('%s\n' % len(c))
+        if len(c) % 4:
+            c += '\0' * (4 - len(c) % 4)
+        sys.stderr.write('%s\n\n' % len(c))
+
+        self.cpio += c
+    
+    def add_padding(self):
+        if len(self.cpio) % 512:
+            self.cpio += '\0' * (512 - len(self.cpio) % 512)
+
+    def get(self):
+        self.add('TRAILER!!!', '')
+        self.add_padding()
+        return ''.join(self.cpio)
+        
+
+def main():
+    cpio = Cpio()
+    cpio.add(name='asdf', content='123\n')
+    cpio.add(name='bar', content='foo1\n')
+    cpio.add(name='services', content=open('/etc/services').read())
+    sys.stdout.write(cpio.get())
+
+
+
+if __name__ == '__main__':
+    main()