new hashing

bin/hash-update

@@ -0,0 +1 @@
+../files/hash-update

files/hash-update

@@ -0,0 +1,129 @@
+#!/bin/bash
+
+function helpexit() {
+    echo 'Create or append md5/sha* list of files
+Usage:
+    Creating hashes: hash-update [-r] [-t hash-type] [-f list_name] [[files to hash]]
+    Checking hashes: hash-update -c [-f list_name]
+  -r recursive
+  -c check
+  -t hash-type defaults to sha256. choose from md5, sha1, sha256, sha512 etc..
+  -f list_name is [type]sums.txt by default
+  If files to check omitted, list files in current folder
+
+  Check files with "sha256sum -c sha256sums.txt", or passing -c to this script.
+  To update hashes, simply delete the sha256sums file.
+'
+    exit
+}
+
+function valid_type() {
+    local valid
+    for valid in b2 md5 sha1 sha224 sha256 sha384 sha512; do
+      if [[ "$1" = "$valid" ]]; then
+        return 0
+      fi
+    done
+    return 1
+}
+
+recursive=0
+check=0
+hashtype=sha256
+
+paths=()
+for ((i=1; i<=${#@}; i++)) {
+    j=$(( i + 1 ))
+    [[ "${!i}" = "-h" ]] && helpexit
+    [[ "${!i}" = "--help" ]] && helpexit
+    [[ "${!i}" = "-r" ]] && { recursive=1; continue; }
+    [[ "${!i}" = "-c" ]] && { check=1; continue; }
+    [[ "${!i}" = "-t" ]] && { hashtype="${!j}"; i=$(( $i + 1 )); continue; }
+    [[ "${!i}" = "-f" ]] && { list_name="${!j}"; i=$(( $i + 1 )); continue; }
+    paths+=("${!i}")
+}
+valid_type "$hashtype" || {
+    echo Type "$hashtype" is not valid.
+    echo Choose from b2 md5 sha1 sha224 sha256 sha384 sha512
+    exit 1
+}
+
+if [[ -z "$list_name" ]]; then
+  list_name="${hashtype}sums.txt"
+fi
+SUMBIN="${hashtype}sum"
+which $SUMBIN &>/dev/null || {
+    echo $SUMBIN not in PATH
+    exit 1
+}
+
+if [[ $check -eq 1 ]]; then
+    $SUMBIN -c "$list_name"
+    exit $?
+fi
+
+if [[ ${#paths[@]} -eq 0 ]]; then
+    paths+=(".")
+fi
+which pv &>/dev/null && PVBIN=$( which pv )
+set -e
+echo "Updating: $list_name"
+test -f "$list_name" || touch "$list_name"
+updates_done=0
+_update() {
+    if [ "$1" = "$list_name" ]; then
+        return
+    fi
+    if [[ -L "$1" ]]; then
+        echo "$1 is a symlink"
+        return
+    fi
+    if test -d "$1"; then
+        echo "$1 is a directory"
+        return
+    fi
+    if test -f "$1"; then
+        if sed 's,^[^ ]\+  ,,' "$list_name" | grep -qFx "$1"; then
+            echo "Exists: $1"
+        else
+            echo "New:    $1"
+            size=$( stat -c %s "$1" )
+            if [[ $size -gt 100000000 ]] && [[ -n "$PVBIN" ]]; then
+                # Use pv is size > 100MB
+                sum=$( $PVBIN "$1" | $SUMBIN | awk '{ print $1 }' )
+                printf "%s  %s\n" "$sum" "$1" >> "$list_name"
+            else
+                $SUMBIN "$1" >> "$list_name"
+            fi
+            updates_done=1
+        fi
+    fi
+}
+shopt -s globstar
+shopt -s nullglob
+for ((i=0; i<=${#paths[@]}; i++)) {
+    if [[ -d "${paths[$i]}" ]]; then
+        pathname="${paths[$i]}"
+        pathname="${pathname%%/}"
+        if [[ "$recursive" -eq 1 ]]; then
+            for file in "${pathname}"/**; do
+                file="${file#./}"
+                _update "$file"
+            done
+        else
+            for file in "${pathname}"/*; do
+                file="${file#./}"
+                _update "$file"
+            done
+        fi
+    fi
+    if [[ -f "${paths[$i]}" ]]; then
+        file="${paths[$i]}"
+        file="${file#./}"
+        _update "$file"
+    fi
+}
+
+if [[ $updates_done -eq 1 ]]; then
+    sort -k 2 -o "$list_name" "$list_name"
+fi