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From ea14134fc6b3305d28f317170e3c0daec00628ac Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Fri, 5 Dec 2014 13:52:25 +0000
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Subject: [PATCH] v2v: Fix missing loop device which breaks conversion of RHEL
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3 guests (RHBZ#1171130).
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(cherry picked from commit 1bd779c983d62f36bf50ad613928cf209f98fbce)
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---
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v2v/convert_linux.ml | 26 +++++++++++++++++++++-----
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1 file changed, 21 insertions(+), 5 deletions(-)
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diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml
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index 5852022..a4897ca 100644
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--- a/v2v/convert_linux.ml
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+++ b/v2v/convert_linux.ml
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@@ -883,14 +883,30 @@ let rec convert ~verbose ~keep_serial_console (g : G.guestfs) inspect source =
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(* loop is a module in RHEL 5. Try to load it. Doesn't matter
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* for other OSs if it doesn't exist, but RHEL 5 will complain:
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* "All of your loopback devices are in use."
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- *
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- * XXX RHEL 3 unfortunately will give this error anyway.
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- * mkinitrd runs the nash command `findlodev' which is
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- * essentially incompatible with modern kernels that don't
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- * have fixed /dev/loopN devices.
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*)
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(try g#modprobe "loop" with G.Error _ -> ());
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+ (* On RHEL 3 we have to take extra gritty to get a working
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+ * loopdev. mkinitrd runs the nash command `findlodev'
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+ * which does this:
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+ *
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+ * for (devNum = 0; devNum < 256; devNum++) {
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+ * sprintf(devName, "/dev/loop%s%d", separator, devNum);
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+ * if ((fd = open(devName, O_RDONLY)) < 0) return 0;
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+ * if (ioctl(fd, LOOP_GET_STATUS, &loopInfo)) {
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+ * close(fd);
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+ * printf("%s\n", devName);
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+ * return 0;
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+ * // etc
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+ *
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+ * In a modern kernel, /dev/loop<N> isn't created until it is
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+ * used. But we can create /dev/loop0 manually. Note we have
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+ * to do this in the appliance /dev. (RHBZ#1171130)
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+ *)
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+ if family = `RHEL_family && inspect.i_major_version = 3 then
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+ ignore (g#debug "sh" [| "mknod"; "-m"; "0666";
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+ "/dev/loop0"; "b"; "7"; "0" |]);
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+
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(* RHEL 4 mkinitrd determines if the root filesystem is on LVM
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* by checking if the device name (after following symlinks)
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* starts with /dev/mapper. However, on recent kernels/udevs,
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--
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1.8.3.1
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