Add sha256sum.sh

bin/release/sha256sum.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+set -Eeuo pipefail
+
+# functions
+function init_terminal_colors(){
+    color_red=$(echo -ne "\033[1;31m")
+    color_green=$(echo -ne "\033[1;32m")
+    color_reset=$(echo -ne "\033[0m")
+}
+
+function log(){
+    color="$1"
+    title="$2"
+    message="$3"
+    if basename "$0" >/dev/null 2>&1 ; then
+        parent=$(basename "$0")
+    else
+        parent="."
+    fi
+    echo "${color}${parent}: ${title}: ${message}${color_reset}" 1>&2
+}
+
+function usage(){
+    echo "Description: Prints sha256sum for input files, and write it to <input dir file>/<input file>.sha256."
+    echo
+    echo "Usage: $(basename "$0") [Options]... <file1> <file2>..."
+    echo "   Example: This command prints sha256sum for input files"
+    echo "            $ $(basename "$0") file1.zip file2.exe file3.tar.gz"
+    echo
+    echo "Options: #mandatory #optional"
+    echo
+    echo "  --help #optional"
+    echo "      This help text"
+    echo
+    echo "  --write #optional"
+    echo "      Write sha256sum to <input dir file>/<input file>.sha256"   
+    echo "        : default value: false"
+    echo "        : example: $(basename "$0") --write dir1/file1.zip dir2/file2.exe dir3/dir3/file3.tar.gz"
+    echo "                   Will print sha256sum to standard output and create dir1/file1.zip.sha256 dir2/file2.exe.sha256 dir3/dir3/file3.tar.gz.sha256"
+    echo
+}
+
+function consume_args(){
+    files=''
+    write=false
+    while [[ $# -gt 0 ]] ; do
+        case "$1" in
+        --help)
+            usage
+            exit 0
+            ;;
+        --write)
+            if [[ ${2:-} =~ true|false ]] ; then
+                write=$2
+                shift
+                shift
+            else
+                write=true
+                shift
+            fi
+            ;;
+        --*)
+            log "$color_red" "option $1" "is unknown"
+            usage >&2
+            return 1
+            ;;
+        *)
+            file="$1"
+            files="$files $1"
+            shift
+        esac
+    done
+
+    # check mandatory options
+    if [[ -z $files ]] ; then
+        log "$color_red" "mandatory option" "Please specify an input file"
+        usage
+        exit 1
+    fi
+}
+
+# main
+init_terminal_colors
+consume_args "$@"
+for file in $files ; do
+    if [[ -f $file ]] ; then
+        sha256sum_file="$file.sha256"
+        sha256sum=$(sha256sum "$file")
+        if [[ $write == false ]] ; then
+            echo "${sha256sum}"
+        else
+            echo -n "${sha256sum},"
+            echo "${sha256sum}" | cut --delimiter ' ' --field 1 > "$sha256sum_file" && exit_code=0 || exit_code=1
+            if [[ $exit_code -eq 0 ]] ; then
+                echo "    $sha256sum_file ${color_green}created${color_reset}"
+            else
+                echo
+                log "$color_red" "output permissions" "Can not output to $sha256sum_file"
+                exit 1
+            fi
+        fi
+    else
+        log "$color_red" "input file" "$file does not exist"
+        exit 1
+    fi
+done