[Fedora-livecd-list] [PATCH] Add initramfs image creator

[Alan Pevec]

Add initramfs image creator

Installed system is packaged as a cpio archive to be used as initramfs.

Based on markmc's patch:
http://people.redhat.com/markmc/live/livecd-creator-patches/livecd-initramfs-target.patch

Signed-off-by: Alan Pevec <apevec at redhat.com>

Index: livecd/imgcreate/creator.py
===================================================================
--- livecd.orig/imgcreate/creator.py
+++ livecd/imgcreate/creator.py
@@ -832,3 +832,58 @@ class LoopImageCreator(ImageCreator):
     def _stage_final_image(self):
         self._resparse()
         shutil.move(self._image, self._outdir + "/" + self.name + ".img")
+
+
+class InitramfsImageCreator(ImageCreator):
+    """Installs a system into a cpio archive for initramfs.
+
+    InitramfsImageCreator is a straightforward ImageCreator subclass;
+    the installed system is packaged as a compressed cpio archive which can be
+    subsequently used for initramfs.
+
+    """
+
+    def __init__(self, ks, name):
+        """Initialize an InitramfsImageCreator instance.
+        """
+        ImageCreator.__init__(self, ks, name)
+
+    def _cdroot(self):
+        """Change into the install root.
+        """
+        os.chdir(self._instroot)
+
+    #
+    # Actual implementation
+    #
+    def _get_fstab(self):
+        s =  "rootfs     /         ext3    defaults,noatime 0 0\n"
+        s += "devpts     /dev/pts  devpts  gid=5,mode=620   0 0\n"
+        s += "tmpfs      /dev/shm  tmpfs   defaults         0 0\n"
+        s += "proc       /proc     proc    defaults         0 0\n"
+        s += "sysfs      /sys      sysfs   defaults         0 0\n"
+        return s
+
+    def _mount_instroot(self, base_on = None):
+        if not base_on is None:
+            try:
+                subprocess.call(['/usr/bin/pax', '-rzf', base_on], preexec_fn=self._cdroot)
+            except OSError, e:
+                raise CreatorError("Failed to extract '%s': %s" % (base_on, e))
+
+    def __get_image(self):
+        return self._outdir + "/" + self.name + ".img"
+    _image = property(__get_image)
+    """The location of the initramfs archive.
+    """
+
+    def _stage_final_image(self):
+        try:
+            instroot_init = self._instroot + "/init"
+            if not os.path.lexists(instroot_init):
+                os.symlink("sbin/init", instroot_init)
+            subprocess.call(['/usr/bin/pax', '-w', '-zx', 'sv4cpio', '-s', '/^\.\///',
+                             '-f', self._image, '.'], preexec_fn=self._cdroot)
+        except OSError, e:
+            raise CreatorError("Failed to create the initramfs image: %s" % e)
+
Index: livecd/livecd-tools.spec
===================================================================
--- livecd.orig/livecd-tools.spec
+++ livecd/livecd-tools.spec
@@ -20,6 +20,7 @@ Requires: squashfs-tools
 Requires: pykickstart >= 0.96
 Requires: dosfstools >= 2.11-8
 Requires: isomd5sum
+Requires: pax
 %ifarch %{ix86} x86_64
 Requires: syslinux
 %endif