README

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-*shasumscript* is a tool to generate a self-checksum-script.
-
-Usage
-
-	shasumscript script.sh
-
-License
-
-	GNU-GPL-3
-
-From an idea of LSC https://github.com/dealfonso/lsc
-
-

README.md

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+# shasumscript
+
+A tool to generate a self-checksum-script.

shasumscript

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-#!/bin/sh
-# Script to add a SHA256 checksum to a file
-# Usage: shasumscript <file>
-# Output: <file>_sha256
-# Requires: shasum
-# License: GNU GPL3
-# Author: Patrick Cao Huu Thien
-
-set -e
-
-error() { printf "Error: \e[31m%s\e[0m\n" "$*" >&2; }
-err() { error "$*"; exit 1; }
-usage() { echo "Usage: $(basename "$0") [-V | -h] <file>";echo "  -V: Show version"; echo "  -h: Show this help"; }
-err_usage() { error "$*"; usage; exit 1; }
-step () { err="$?"; c=32; t=OK; test "$err" = 0 || { c=31; t=FAILED; }; printf "* %s \e[%dm%s\e[0m\n" "$*" "$c" "$t"; }
-compress() { cat | gzip -9 | base64 -w0; }
-	
-
-VERSION="0.0.1"
-if test "$1" = '-V'; then echo "shasumscript v$VERSION"; exit; fi
-if test "$1" = '-h'; then usage; exit; fi
-
-file="$1"
-test -n "$file" || err_usage "Missing file argument"
-test -e "$file" || err "File not found: $file"
-
-sha="$(shasum -a 256 "$file" | cut -d' ' -f1)" || err "Failed to calculate SHA256 checksum"
-step "Checksum"
-
-bin=$(compress < "$file")
-step "Compress"
-
-defkey=$(gpgconf --list-options gpg | awk -F: '$1 == "default-key" {print $10}' | tr -dc 'A-Z0-9')
-step "GPG default key" 
-if test -n "$defkey" 
-then 
-	pub=$(gpg --export --output - "$defkey" | compress)
-	step "Public key"
-	sig=$(gpg --detach-sig --output - "$file" | compress)
-	step "Signature"
-fi
-
-newfile="${file}_sha256"
-
-cat <<EOT > "$newfile"
-#!/bin/sh
-# script generated by shasumscript at $(date)
-#
-# This script self-checkssum it's content and exit on error
-# The real script can be found after line 37.
-#
-# License: GNU GPL3
-# Author: Patrick Cao Huu Thien
-
-set -e
-
-sig="$sig"
-pub="$pub"
-tmpexe="\$(mktemp)"
-tmpsig="\$(mktemp)"
-tmppub="\$(mktemp)"
-trap 'rm -f "\$tmpexe" "\$tmpsig" "\$tmppub"' EXIT
-
-cat "\$0" | sed '1,36d' | base64 -d 2>/dev/null| gunzip 2>/dev/null > "\$tmpexe"
-test "\$(sha256sum "\$tmpexe" | cut -d' ' -f1)" = "$sha" || {
-	echo "Checksum mismatch!" >&2
-	exit 1
-}
-txt='Checksum';printf -- "\r- \$txt";sleep 0.1;printf -- "\r/";sleep 0.1;printf -- "\r|";sleep 0.1;printf -- "\r\\\\";sleep 0.1;printf -- "\r  \e[32m%s OK\e[0m" "\$txt";sleep 0.3
-EOT
-step "pre-script"
-if test -n "$defkey"
-then
-cat <<EOT >> "$newfile"
-echo "\$sig" | base64 -d 2>/dev/null | gunzip 2>/dev/null > "\$tmpsig"
-echo "\$pub" | base64 -d 2>/dev/null | gunzip 2>/dev/null > "\$tmppub"
-gpg --verify -q --keyring "\$tmppub" "\$tmpsig" "\$tmpexe" 2>&1 | grep -q 'Good signature' || {
-	echo "Signature mismatch!" >&2
-	exit 1
-}
-txt='Verification';printf -- "\r- \$txt";sleep 0.1;printf -- "\r/";sleep 0.1;printf -- "\r|";sleep 0.1;printf -- "\r\\\\";sleep 0.1;printf -- "\r  \e[32m%s OK\e[0m" "\$txt";sleep 0.3
-EOT
-step "verify-script"
-else
-cat <<EOT >> "$newfile"
-
-#
-# No public key available
-#
-# skip GPG verification
-#
-
-EOT
-step "no-verify-script"
-fi
-cat <<EOT >> "$newfile"
-printf "\r                        \r"
-
-sh "\$tmpexe" "\$@"
-
-exit
-EOT
-
-echo "$bin" >> "$newfile"
-step "binary"
-
-chmod +x "$newfile"
-step "make it executable"
-echo
-cat <<EOT
-File created: $newfile
-
-You can distribute it.
-
-To run it:
-	./$newfile
-EOT
-
-