40 lines
1.3 KiB
Bash
40 lines
1.3 KiB
Bash
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#!/bin/sh
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Author: Jascha Sundaresan <flizarthanon@gmail.com>
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#
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# This helper script generates a top-level 'rootfs' node for inclusion
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# in a Flattened Image Tree (FIT) source (.its) file. The node includes
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# the size and SHA1 hash of a given root filesystem image and is used by
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# certain Netgear devices which expect this metadata at the top level of
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# the FIT structure.
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#
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# The resulting block is written to standard output and can be appended
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# or inserted into an existing .its file by the OpenWrt build system.
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# Example:
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# scripts/gen_netgear_rootfs_node.sh build_dir/.../root.squashfs > node.txt
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#
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# See also: scripts/mkits.sh, which generates the main FIT .its source.
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ROOTFS_FILE="$1"
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ROOTFS_SIZE=$(stat -c %s "${ROOTFS_FILE}")
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ROOTFS_SHA1=$(
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sha1sum "${ROOTFS_FILE}" | awk '{ print "<0x" substr($0, 1, 8) \
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" 0x" substr($0, 9, 8) \
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" 0x" substr($0, 17, 8) \
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" 0x" substr($0, 25, 8) \
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" 0x" substr($0, 33, 8) ">" }'
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)
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cat <<EOF | sed 's/^/\t/'
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rootfs {
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size = <${ROOTFS_SIZE}>;
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hash-1 {
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value = ${ROOTFS_SHA1};
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algo = "sha1";
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};
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};
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EOF
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