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|
#! /usr/bin/env sh
UPDATE_SCRIPT_NAME="update.sh"
info() {
echo "Info: $1"
}
dbg() {
[ -n "$DEBUG_ENABLE" ] && echo "Debug: $1"
}
die() {
echo "Error: $1"
exit 1
}
# Search for a file “upwards”.
# This will return the relative path from "$1" to the found file.
#
# # Type
# upfind :: Path -> String -> Path
#
# # Arguments
# $1
# : The directory to use as start of your search.
#
# $2
# : The file to search for.
#
# # Example
# upfind "/home/user1" "/usr"
# => /usr
upfind() {
starting_directory="$(readlink --canonicalize "$1")"
search_string="$2"
current_directory="$starting_directory"
while
search_result=$(fd "$search_string" "$current_directory/" --max-depth 1)
dbg "Debugging upfind - search in $current_directory gives: $search_result"
[ -z "$search_result" ] && [ "$current_directory" != "/" ]
do current_directory=$(dirname "$current_directory"); done
realpath --relative-to="$1" "$search_result"
}
# Construct the storage path for the update script allowed hashes.
#
# # Type
# get_storage_path :: Path -> Path
#
# # Arguments
# $1
# : The path to the update script
#
# # Returns
# The constructed storage path.
get_storage_path() {
update_script="$(realpath "$1")"
storage_path="$XDG_DATE_HOME/fupdate-flake/$update_script"
echo "$storage_path"
}
# Checks if a given path to the update script is allowed.
#
# # Type
# is_allowed :: Path -> bool
#
# # Arguments
# $1
# : The path to the update script to check.
#
# # Return exit code
# 0
# : If the update script is allowed
#
# 1
# : If it is not.
is_allowed() {
update_script="$(realpath "$1")"
storage_path="$(get_storage_path "$update_script")"
# Use this invocation, to also include the path to the `$update_script`
update_script_hash="$(sha256sum "$update_script")"
if [ -f "$storage_path" ]; then
if [ "$(cat "$storage_path")" = "$update_script_hash" ]; then
return 0
else
return 1
fi
else
return 1
fi
}
# Asks the user if they want to allow a given script.
#
# # Type
# ask_to_allow_update_script :: Path
#
# # Arguments
# $1
# : The path to the update script to ask for.
ask_to_allow_update_script() {
update_script="$(realpath "$1")"
printf "\033[2J" # clear the screen
cat "$update_script"
printf "Do you want to allow this script?[N/y]: "
read -r allow
case "$allow" in
[yY])
info "Update script allowed."
storage_path="$(get_storage_path "$update_script")"
update_script_hash="$(sha256sum "$update_script")"
mkdir --parents "$(dirname "$storage_path")"
printf "%s" "$update_script_hash" >"$storage_path"
;;
*)
info "Update script not allowed."
;;
esac
}
# Performs a full update.
# This consists of running an update script.
# Additionally, it also checks for duplicated inputs in a `flake.lock` file, if it exists.
#
# # Type
# update :: Path -> Path -> [String]
#
# # Arguments
# $1
# : The path to the update script to execute.
#
# $2
# : The base directory from which to start the update.
#
# $3
# : Arguments to pass to the update script.
update() {
update_script="$1"
base_directory="$2"
shift 2
cd "$base_directory" || die "The provided base directory '$base_directory' cannot be accessed"
dbg "Changed directory to: $base_directory"
dbg "Executing update script ('$update_script') following args: '$*'"
"$update_script" "$@"
if [ -f "flake.lock" ] && grep '[^0-9]_[0-9]' flake.lock --quiet; then
batgrep '[^0-9]_[0-9]' flake.lock
die "Your flake.nix contains duplicate inputs!"
fi
}
main() {
base_directory="$(git rev-parse --show-toplevel)"
update_script="$(upfind "$PWD" "$UPDATE_SCRIPT_NAME")"
dbg "update_script is: $update_script"
if [ "$update_script" = "" ]; then
die "Failed to find update script."
elif is_allowed "$update_script"; then
update "$update_script" "$base_directory" "$@"
else
ask_to_allow_update_script "$update_script"
is_allowed "$update_script" && main "$@"
fi
}
main
# vim: ft=sh
|
