#!/bin/bash
#
# Helper script to clean up, restore symlinks and set permissions
# in a just downloaded and uncompressed (zipball) instance.
#
# Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
#         Kovács Zoltán <kovacsz@marcusconsulting.hu>
# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
# 2023-09-11 v1.0
# new: forked from the "Smartfront's DOCKER_skeleton" repository.
# 2022-11-04 v0.2
# fix: Content regexp now matches well to the special chars allowed.
# 2022-09-22 v0.1 Initial release.

# Where I'm?
# https://gist.github.com/TheMengzor/968e5ea87e99d9c41782
[[ -z "$(which dirname)"  ]] && exit 1
[[ -z "$(which readlink)" ]] && exit 1
#
SOURCE="$0"
while [ -h "$SOURCE" ]; do
    # resolve $SOURCE until the file is no longer a symlink
    SCRPATH="$( cd -P "$(dirname "$SOURCE" )" && echo "$PWD" )" #"
    SOURCE="$(readlink "$SOURCE")"
    # if $SOURCE was a relative symlink, we need to resolve it
    # relative to the path where the symlink file was located
    [[ $SOURCE != /* ]] && SOURCE="$SCRPATH/$SOURCE"
done; SCRPATH="$( cd -P "$(dirname "$SOURCE" )" && echo "$PWD" )" #"
# We've the absolute path of the script.

# Removing some unnecessary files.
#
if [ -n "$(which find)" ]; then
    find "$SCRPATH" -name .gitignore -delete
fi
if [ -d "$SCRPATH/.git" ]; then
    rm -Rf "$SCRPATH/.git" 2>/dev/null
fi

# Restoring the symlinks.
# All files considered as a symlink which is containing a single line
# with a valid pathname inside.
#
if [ -n "$(which awk)" -a -n "$(which cut)" -a -n "$(which find)" -a -n "$(which ln)" ]; then
    # Files containing maximum 1 line - the .metadata store is a special exception.
    IFS=$'\n' read -r -d '' -a SUSPECTS < <( (find "$SCRPATH" ! -name '.metadata' -type f -exec awk 'END { if (NR < 2) print FILENAME }' {} \;) && printf '\0' )
    # Enumerates these files.
    for suspect in "${SUSPECTS[@]}"
    do
	if [ -n "$suspect" -a -s "$suspect" ]; then
	    # Checks the content: it seems to be a valid pathname?
	    # For this tricky read see https://stackoverflow.com/questions/46163678/
	    IFS= read -r -n 1024 -d '' content <"$suspect" || [[ $content ]]
	    if [[ "$content" =~ ^([[:alnum:]]|[-_/. ])+$ ]]; then
		# Replaces the suspect with a symlink pointing to it's content.
		rm "$suspect" 2>/dev/null ; ln -s "$content" "$suspect" 2>/dev/null
	    fi
	fi
    done
fi

# We'll use the metastore DB (if any) to restore
# the dates and saved permissions individually.
#
if [ -n "$(which metastore)" -a -x "$(which metastore)" ]; then
    (	cd "$SCRPATH"
	if [ -e ".metadata" ]; then
    	    "$(which metastore)" -amqq 2>/dev/null
	fi
    )
fi
#
# Finally we correct the permissions according to umask 007,
# allow access to directories for backup purposes
# and we grant R/W permission to the user running the script.
chmod -R g+rw,o-rw "$SCRPATH"
find "$SCRPATH" -type d -exec chmod 2771 {} \;
SETFACL="$(which setfacl)"
if [ -n "$SETFACL" ]; then
    "$SETFACL" -R -d -m u:$USER:rwX,g::rwX "$SCRPATH" 2>/dev/null
    find "$SCRPATH" -type d -exec "$SETFACL" -m u:$USER:rwx {} 2>/dev/null \;
    find "$SCRPATH" -type f -exec "$SETFACL" -m u:$USER:rw  {} 2>/dev/null \;
fi

# That's all, Folks! :)