1 files changed, 65 insertions, 0 deletions
diff --git a/pomf2gomf.bash b/pomf2gomf.bash
new file mode 100755
index 0000000..5241283
--- /dev/null
+++ b/pomf2gomf.bash
@@ -0,0 +1,65 @@
+#!/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