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Add required hook functions to netboot boot script

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Initramfs-tools boot scripts must provide hook functions (netboot_top,
netboot_premount, netboot_bottom) and mount wrappers (mount_top, mount_premount,
mount_bottom) for the init script to call them properly.

Without these, the init script doesn't recognize netboot as a valid boot method
and falls back to trying /dev/root, causing "cannot open block device" errors.
This commit is contained in:
Torbjørn Lindahl
2026-01-31 10:43:33 +01:00
parent 8e9a90bfc3
commit d7d0098a5c
1 changed files with 53 additions and 0 deletions
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53
initramfs/scripts/netboot
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@@ -7,6 +7,38 @@ export PATH=/usr/bin:/usr/sbin:/bin:/sbin
MOUNTPOINT=/root
TMPFS_MOUNT=/mnt
# Hook functions for initramfs-tools boot script integration
netboot_top()
{
if [ "${netboot_top_used}" != "yes" ]; then
[ "${quiet?}" != "y" ] && log_begin_msg "Running /scripts/netboot-top"
run_scripts /scripts/netboot-top
[ "$quiet" != "y" ] && log_end_msg
fi
netboot_top_used=yes
}
netboot_premount()
{
if [ "${netboot_premount_used}" != "yes" ]; then
[ "${quiet?}" != "y" ] && log_begin_msg "Running /scripts/netboot-premount"
run_scripts /scripts/netboot-premount
[ "$quiet" != "y" ] && log_end_msg
fi
netboot_premount_used=yes
}
netboot_bottom()
{
if [ "${netboot_premount_used}" = "yes" ] || [ "${netboot_top_used}" = "yes" ]; then
[ "${quiet?}" != "y" ] && log_begin_msg "Running /scripts/netboot-bottom"
run_scripts /scripts/netboot-bottom
[ "$quiet" != "y" ] && log_end_msg
fi
netboot_premount_used=no
netboot_top_used=no
}
# Parse kernel command line for HTTP root
parse_cmdline() {
for x in $(cat /proc/cmdline); do
@@ -27,6 +59,11 @@ parse_cmdline() {
mountroot() {
rc=1
# Run hook scripts
netboot_top
netboot_premount
parse_cmdline
if test -z "${ROOT_URL}"; then
@@ -145,3 +182,19 @@ mountroot() {
return ${rc}
}
# Standard mount hook wrappers expected by initramfs init
mount_top()
{
netboot_top
}
mount_premount()
{
netboot_premount
}
mount_bottom()
{
netboot_bottom
}