[elbe-devel] [PATCH 2/3] grub-legacy: Add a grubinstaller variant

[bage at linutronix.de]

From: Christian Teklenborg <chris at linutronix.de>

Keep the setup and teardown of the loop device as in the grub2 version.
Obviously, use update-grub to update the grub configuration but tweak the
menu.lst (the grub-legacy config file) to work for most cases.

This does not set the console value from the XML that should be set in kopt
as well but would need code restructuring to get that information.

Signed-off-by: Christian Teklenborg <chris at linutronix.de>
Signed-off-by: Bastian Germann <bage at linutronix.de>
---
 elbepack/hdimg.py | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 elbepack/rfs.py   |  2 ++
 2 files changed, 60 insertions(+)

diff --git a/elbepack/hdimg.py b/elbepack/hdimg.py
index 5c8ef6d84..225228210 100644
--- a/elbepack/hdimg.py
+++ b/elbepack/hdimg.py
@@ -219,6 +219,62 @@ class grubinstaller202(grubinstaller_base):
             do("losetup -d /dev/poop0", allow_fail=True)
 
 
+class grubinstaller97(grubinstaller_base):
+
+    def install(self, target):
+        if '/' not in self.fs:
+            return
+
+        imagemnt = os.path.join(target, "imagemnt")
+        imagemntfs = Filesystem(imagemnt)
+        try:
+            do('cp -a /dev/loop0 /dev/poop0')
+
+            do('losetup /dev/poop0 "%s"' % self.fs['/'].filename)
+            do('kpartx -as /dev/poop0')
+
+            for entry in self.fs.depthlist():
+                do('mount /dev/mapper/poop0p%d %s' %
+                   (entry.partnum, imagemntfs.fname(entry.mountpoint)))
+
+            do("mount --bind /dev %s" % imagemntfs.fname("dev"))
+            do("mount --bind /proc %s" % imagemntfs.fname("proc"))
+            do("mount --bind /sys %s" % imagemntfs.fname("sys"))
+
+            do('mkdir -p "%s"' % imagemntfs.fname("boot/grub"))
+
+            devmap = open(imagemntfs.fname("boot/grub/device.map"), "w")
+            devmap.write("(hd0) /dev/poop0\n")
+            devmap.close()
+
+            chroot(imagemnt, "update-initramfs -u -k all")
+
+            # Replace groot and kopt because
+            # else they will be given bad values
+            do('chroot %s sed -in "s/^# groot=.*$/# groot=\(hd0,%d\)/" %s' %
+               (imagemnt, int(entry.partnum) - 1, "/boot/grub/menu.lst"))
+            do('chroot %s sed -in "s/^# kopt=.*$/# kopt=root=LABEL=%s/" %s' %
+               (imagemnt, entry.label, "/boot/grub/menu.lst"))
+
+            chroot(imagemnt, "update-grub")
+
+            do("chroot %s grub-install --no-floppy /dev/poop0" %
+               (imagemnt))
+
+        finally:
+            os.unlink(imagemntfs.fname("boot/grub/device.map"))
+            do("umount %s" % imagemntfs.fname("dev"), allow_fail=True)
+            do("umount %s" % imagemntfs.fname("proc"), allow_fail=True)
+            do("umount %s" % imagemntfs.fname("sys"), allow_fail=True)
+
+            for entry in reversed(self.fs.depthlist()):
+                do('umount /dev/mapper/poop0p%d' % entry.partnum,
+                   allow_fail=True)
+
+            do('kpartx -d /dev/poop0', allow_fail=True)
+            do("losetup -d /dev/poop0", allow_fail=True)
+
+
 class simple_fstype(object):
     def __init__(self, typ):
         self.type = typ
@@ -347,6 +403,8 @@ def do_image_hd(hd, fslabel, target, grub_version, grub_fw_type=None):
 
     if grub_version == 202:
         grub = grubinstaller202(grub_fw_type)
+    elif grub_version == 97:
+        grub = grubinstaller97(grub_fw_type)
     else:
         grub = grubinstaller_base()
 
diff --git a/elbepack/rfs.py b/elbepack/rfs.py
index b77d5cc87..c65d9831f 100644
--- a/elbepack/rfs.py
+++ b/elbepack/rfs.py
@@ -83,6 +83,8 @@ class BuildEnv (object):
         if not self.rfs.isfile("etc/elbe_version"):
             # avoid starting daemons inside the buildenv
             self.rfs.mkdir_p("usr/sbin")
+            # grub-legacy postinst will fail if /boot/grub does not exist
+            self.rfs.mkdir_p("boot/grub")
             self.rfs.write_file(
                 "usr/sbin/policy-rc.d",
                 0o755,
-- 
2.20.1