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Fallback to a boot_server kernel param if ip= not passed

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Depending on bootloader and configuration, ramdisks may receive
a ip= kernel parameter that is used for manual network bring up
in the ramdisk.  This parameter contains the address of the boot
server.  In the absence of ip=, we want the ramdisk to DHCP and
proceed as normal.  However, in this case need to know the address
of the boot server.  This falls back to a 'boot_server' parameter
for this address if it is not provided via kernel cmdline.

Change-Id: Id1ed15ba125d91fa0a13d8e19d1385082ee5d9e9
Closes-bug: #1401289
Related-bug: #1401298
This commit is contained in:
Adam Gandelman 2014-12-10 15:36:15 -08:00
parent 1273cd5532
commit 441b30f89f
1 changed files with 8 additions and 1 deletions
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9
elements/ramdisk-base/init.d/20-init-variables
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@ -18,7 +18,14 @@ readonly _BOOTIF_=$(get_kernel_parameter BOOTIF)
readonly _IP_=$(get_kernel_parameter ip)
readonly BOOT_MAC_ADDRESS=$(echo "$_BOOTIF_" | sed -e "s/-/:/g" | \
sed -e "s/^01://g" | tr 'a-f' 'A-F')
readonly BOOT_SERVER=$(echo "$_IP_" | cut -d':' -f2)
# If bootloader did not pass on network info, we fallback to a kernel
# parameter to locate the address of the boot server.
if [ -n "$_IP_" ]; then
readonly BOOT_SERVER=$(echo "$_IP_" | cut -d':' -f2)
else
readonly BOOT_SERVER=$(get_kernel_parameter boot_server)
fi
# IP address, netmask, gateway can be set a later point of time if
# IP address is assigned by dhcp (for non-pxe boots).