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#!/usr/bin/env bash
# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "Windows configuration files" project.
# For details, see https://github.com/egor-tensin/windows-home.
# Distributed under the MIT License.
# This relies on the availability of native symlinks.
# Those are indeed supported by NTFS, but require Administrator privileges for
# creation.
# It likely won't bother you as long as you don't use the functions defined in
# this file.
# In any case, you will see `ln` complaining about some access being denied in
# case something goes wrong.
#
# Remember that in order to force `ln` to use native NTFS symlinks, your
# `CYGWIN` Windows environment variable value **must** include either
# `winsymlinks:native` or `winsymlinks:nativestrict`!
set -o errexit
set -o nounset
set -o pipefail
dump() {
local prefix="${FUNCNAME[0]}"
if [ "${#FUNCNAME[@]}" -gt 1 ]; then
prefix="${FUNCNAME[1]}"
fi
while [ "$#" -ne 0 ]; do
echo "$prefix: $1" || true
shift
done
}
script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
ensure_symlinks_enabled() {
case "${CYGWIN:-}" in
*winsymlinks:native*) ;;
*winsymlinks:nativestrict*) ;;
*)
dump 'native Windows symbolic links aren'"'"'t enabled in Cygwin' >&2
return 1
;;
esac
}
database_path="$script_dir/db.bin"
declare -A database
ensure_database_exists() {
[ -f "$database_path" ] || touch "$database_path"
}
read_database() {
local entry
while IFS= read -d '' -r entry; do
database[$entry]=1
done < "$database_path"
}
write_database() {
> "$database_path"
local entry
for entry in "${!database[@]}"; do
printf '%s\0' "$entry" >> "$database_path"
done
}
delete_obsolete_dirs() {
if [ $# -ne 2 ]; then
echo "usage: ${FUNCNAME[0]} BASE_DIR DIR"
return 1
fi
local base_dir="$1"
local dir="$2"
base_dir="$( readlink -m "$base_dir" )"
dir="$( readlink -m "$dir" )"
if [ ! -d "$base_dir" ]; then
dump "base directory doesn't exist: $base_dir" >&2
return 1
fi
[ "$base_dir" == "$dir" ] && return 0
local subpath="${dir##$base_dir/}"
if [ "$subpath" == "$dir" ]; then
dump "base directory: $base_dir" >&2
dump "... is not a parent of: $dir" >&2
return 1
fi
( cd "$base_dir" && rmdir -p "$subpath" --ignore-fail-on-non-empty )
}
delete_obsolete_entries() {
local entry
for entry in "${!database[@]}"; do
dump "entry: $entry"
local var_name
var_name="$( expr "$entry" : '%\([_[:alpha:]][_[:alnum:]]*\)%/' )"
if [ -z "$var_name" ]; then
dump ' couldn'"'"'t extract variable name' >&2
unset database["$entry"]
continue
fi
if [ -z "${!var_name+x}" ]; then
dump " variable is not set: $var_name" >&2
unset database["$entry"]
continue
fi
local dest_var_dir
dest_var_dir="$( readlink -m "$( cygpath "${!var_name}" )" )"
local src_var_dir="$script_dir/%$var_name%"
local subpath="${entry#%$var_name%/}"
local dest_path="$dest_var_dir/$subpath"
local src_path="$src_var_dir/$subpath"
if [ ! -e "$dest_path" ]; then
dump " missing destination file: $dest_path" >&2
unset database["$entry"]
continue
fi
if [ ! -e "$src_path" ]; then
dump " missing source file: $src_path" >&2
rm -f "$dest_path"
unset database["$entry"]
local dest_dir
dest_dir="$( dirname "$dest_path" )"
delete_obsolete_dirs "$dest_var_dir" "$dest_dir" || true
continue
fi
if [ ! -L "$dest_path" ]; then
dump " not a symbolic link: $dest_path" >&2
unset database["$entry"]
continue
fi
local target_path
target_path="$( readlink -e "$dest_path" )"
if [ "$target_path" != "$src_path" ]; then
dump " points to a wrong file: $dest_path" >&2
unset database["$entry"]
continue
fi
dump ' ... points to the right file'
done
}
var_name_regex='%\([_[:alpha:]][_[:alnum:]]*\)%'
discover_new_entries() {
local src_var_dir
while IFS= read -d '' -r src_var_dir; do
dump "source directory: $src_var_dir"
local var_name
var_name="$( basename "$src_var_dir" )"
var_name="$( expr "$var_name" : "$var_name_regex" )"
dump " variable name: $var_name"
if [ -z "${!var_name+x}" ]; then
dump " variable is not set: $var_name" >&2
continue
fi
local dest_var_dir
dest_var_dir="$( readlink -m "$( cygpath "${!var_name}" )" )"
dump " destination directory: $dest_var_dir"
local src_path
while IFS= read -d '' -r src_path; do
dump " source file: $src_path"
local entry="%$var_name%${src_path:${#src_var_dir}}"
if [ -n "${database[$entry]+x}" ]; then
dump ' ... points to the right file'
continue
fi
local dest_path="$dest_var_dir${src_path:${#src_var_dir}}"
dump " destination file: $dest_path"
mkdir -p "$( dirname "$dest_path" )"
ln --force -s "$src_path" "$dest_path"
database[$entry]=1
done < <( find "$src_var_dir" -type f -print0 )
done < <( find "$script_dir" -regextype posix-basic -mindepth 1 -maxdepth 1 -type d -regex ".*/$var_name_regex\$" -print0 )
}
main() {
ensure_database_exists
read_database
delete_obsolete_entries
ensure_symlinks_enabled
discover_new_entries
write_database
}
main
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