Extroot works fine when the target device is specified by a path. It fails however if the device is specified by UUID (the target partition gets mounted much later by hotplug hooks). This is because the blkid command is no longer compiled into BusyBox (since changeset [1]) so it's unavailable for the preinit phase.
The closest bug report I was able to find is [2], although the reporting person mentions that /tmp/overlay-disabled showed up which wasn't there in my case. This patch sets PATH and LD_LIBRARY_PATH environment variables so that the blkid command installed on the target device can be used by that particular preinit script. [1] https://dev.openwrt.org/changeset/26245 [2] https://dev.openwrt.org/ticket/10653 Signed-off-by: Jaroslaw Swierczynski <jarek1...@gmail.com> --- Index: package/block-mount/files/50_determine_usb_root =================================================================== --- package/block-mount/files/50_determine_usb_root (wersja 32004) +++ package/block-mount/files/50_determine_usb_root (kopia robocza) @@ -9,6 +9,8 @@ pi_include /lib/functions/mount.sh local OLD_UCI_CONFIG_DIR="$UCI_CONFIG_DIR" + local OLD_PATH="$PATH" + local OLD_LD_LIBRARY_PATH="$LD_LIBRARY_PATH" set_jffs_mp determine_root_device @@ -19,6 +21,9 @@ UCI_CONFIG_DIR="/tmp/overlay/etc/config" ER_IS_SQUASHFS=true ER_OVERLAY_PREFIX="/tmp/overlay" + PATH=$ER_OVERLAY_PREFIX/sbin:$PATH + LD_LIBRARY_PATH=$ER_OVERLAY_PREFIX/usr/lib:$LD_LIBRARY_PATH + export PATH LD_LIBRARY_PATH fi # For squashfs on firstboot root_device will be tmpfs for the ramoverlay, @@ -51,6 +56,9 @@ } } UCI_CONFIG_DIR="$OLD_UCI_CONFIG_DIR" + PATH="$OLD_PATH" + LD_LIBRARY_PATH="$OLD_LD_LIBRARY_PATH" + export PATH LD_LIBRARY_PATH } boot_hook_add preinit_mount_root determine_external_root _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
