+#!/bin/bash

+

+# This software is released into public domain.

+# It is provided "as is", without warranties or conditions of any kind.

+# Anyone is free to modify, redistribute and do anything with this software.

+

+# pomf2gomf.bash: convert pomf-style flat folders with uploads to gomf storage

+

+set -eu

+

+for req in basename sha1sum cut xxd base64 tr touch; do

+ if ! type "$req" >/dev/null; then

+ printf "fatal error: missing command %s\n" "$req" >&2

+ exit 1

+ fi

+done

+

+usage() {

+ printf "usage: %s POMF_DIR GOMF_DIR\n" "$(basename "$0")"

+ printf " where POMF_DIR is a flat directory with files named after their file IDs and\n"

+ printf " extensions and GOMF_DIR is the root dir (created if necessary) of gomf-web\n"

+}

+

+if [ $# -ne 2 ]; then

+ usage >&2

+ exit 2

+fi

+

+pomf="$1"

+gomf="$2"

+

+if ! [ -d "$pomf" ]; then

+ printf "directory %s does not exist\n" "$pomf" >&2

+ exit 1

+fi

+

+mkdir -p "$gomf/upload/files"

+mkdir -p "$gomf/upload/ids"

+

+for file in "$pomf"/*; do

+ name="$(basename "$file")"

+ id="${name%%.*}"

+ ext="${name#*.}"

+ sha="$(sha1sum -b "$file" | cut -d' ' -f1 | xxd -r -p | base64 | tr -d = | tr '+/' '-_')"

+ if [ "$name" = "$ext" ]; then # no ext

+ ext=

+ else

+ ext=".$ext"

+ fi

+ while [ ${#id} -lt 3 ]; do

+ id="_$id"

+ done

+ id1="${id:0:1}" # first letter

+ id2="${id:1:2}" # second and third letter

+ hash1="${sha:0:1}" # first letter

+ hash2="${sha:1:2}" # second and third letter

+

+ hashd="$gomf/upload/files/$hash1/$hash2/$sha"

+ idd="$gomf/upload/ids/$id1/$id2/$id"

+ mkdir -p "$hashd"

+ cp -va "$file" "$hashd/file"

+ mkdir -p "$idd"

+ ln -vs "../../../../files/$hash1/$hash2/$sha/file" "$idd/file$ext" # relative link to $gomf/upload/ids file

+ touch --no-dereference --reference "$file" "$idd/file$ext"

+done