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#! /usr/bin/env dash
# shellcheck source=/dev/null
SHELL_LIBRARY_VERSION="2.1.2" . %SHELL_LIBRARY_PATH
UPDATE_SCRIPT_NAME="update.sh"
CONFIG_DIRECTORY_PATH="$HOME/.local/share/flake-update"
# Both are used in version()
# shellcheck disable=SC2034
AUTHORS="Soispha"
# shellcheck disable=SC2034
YEARS="2023"
UPDATE_SCRIPT_NOT_WANTED=false
# Searches upward for a `UPDATE_SCRIPT_NAME` script
# Returns a path to the script if it exists, otherwise nothing is returned
check_for_update_script() {
dirname="$(search_upward_files "$UPDATE_SCRIPT_NAME")"
if [ "$dirname" ]; then
printf "%s/%s" "$dirname" "$UPDATE_SCRIPT_NAME"
fi
}
# Checks if a given path to the update script is allowed.
# Takes the path as input
# Return 0, if allowed, 1 if not.
check_for_allowed_update_script() {
update_script="$1"
config_path="${CONFIG_DIRECTORY_PATH}${update_script}"
update_script_hash="$(sha256sum "$update_script")"
if [ -f "$config_path" ]; then
if [ "$(cat "$config_path")" = "$update_script_hash" ]; then
dbg "Recorded hash matches"
return 0
else
dbg "Recorded hash \'$(cat "$config_path")\' does not match real hash \'$update_script_hash\', assuming not allowed"
return 1
fi
else
dbg "Path \'$config_path\' does not exist, assuming not allowed"
return 1
fi
}
# Asks the user if they want to allow a given script.
# Takes the path as input
ask_to_allow_update_script() {
update_script="$1"
config_path="${CONFIG_DIRECTORY_PATH}${update_script}"
update_script_hash="$(sha256sum "$update_script")"
println "\033[2J" # clear the screen
cat "$update_script"
readp "Do you want to allow this script?[N/y]: " allow
# shellcheck disable=SC2154
dbg "allow is: $allow"
case "$allow" in
[yY])
dbg "allowed script"
dbg "storing contents in: $config_path"
mkdir --parents "$(dirname "$config_path")"
print "$update_script_hash" >"$config_path"
;;
*)
UPDATE_SCRIPT_NOT_ALLOWED=true
;;
esac
}
# Runs the provided script and continues to update the nix flake
# Takes the path to the script and the directory to the flake as arguments
# If the path to the update script is empty, it will be ignored
update() {
update_script="$1"
flake_base_dir="$2"
shift 2
dbg "Provided following args to update script: '$*'"
cd "$flake_base_dir" || die "Provided dir \'$flake_base_dir\' can not be accessed"
dbg "changed directory to: $flake_base_dir"
nix flake update
if ! [ "$update_script" = "" ] && ! [ "$UPDATE_SCRIPT_NOT_WANTED" = "true" ]; then
"$update_script" "$@"
fi
if grep '[^0-9]_[0-9]' flake.lock >/dev/null; then
batgrep '[^0-9]_[0-9]' flake.lock
die "Your flake.nix contains duplicate inputs!"
fi
}
help() {
cat <<EOF
This is a Nix flake update manager.
USAGE:
$NAME [--help | --version] [flake [--no-script] | <some other command>]
OPTIONS:
--help | -h
Display this help and exit.
--version | -v
Display version and copyright information and exit.
--no-script
Avoid running the 'update.sh' script
COMMANDS:
flake
update the flake project
<some other command>
runs a executable called "update-<some other command>", if it exists
EOF
}
main() {
if ! [ "$UPDATE_SCRIPT_NOT_ALLOWED" = true ]; then
update_script="$(check_for_update_script)"
flake_base_dir="$(search_flake_base_dir)" # Assume, that the update script is in the base dir
dbg "update_script is: $update_script"
dbg "flake_base_dir is: $flake_base_dir"
if [ "$update_script" = "" ]; then
update "" "$flake_base_dir" "$@"
elif check_for_allowed_update_script "$update_script" && ! [ "$update_script" = "" ]; then
update "$update_script" "$flake_base_dir" "$@"
else
ask_to_allow_update_script "$update_script"
main "$@"
fi
fi
}
if [ "$#" -eq 0 ]; then
main
exit 0
fi
for input in "$@"; do
case "$input" in
"--help" | "-h")
help
exit 0
;;
"--version" | "-v")
version
exit 0
;;
"--no-script" | "-n")
UPDATE_SCRIPT_NOT_WANTED=true
;;
"--")
end_of_cli_options=true
# Stop processing args after that marker.
break
;;
esac
[ "$end_of_cli_options" = "true" ] && break
done
case "$1" in
"flake")
shift 1
# Filter out fupdate specific flags
while [ "$1" != "--" ]; do
# FIXME: This check allows to add a flag multiple times, but this should probably
# not be allowed <2024-03-29>
case "$1" in
"--no-script" | "-n")
shift 1;
;;
*)
break;
;;
esac
done
[ "$1" = "--" ] && shift 1
main "$@"
;;
*)
command="$1"
shift 1
[ "$1" = "--" ] && shift 1
if which update-"$command" >/dev/null 2>&1; then
update-"$command" "$@"
else
die "command \"update-$command\" is not executable, or does not exist"
fi
;;
esac
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