diff options
| -rw-r--r-- | update.sh | 89 |
1 files changed, 82 insertions, 7 deletions
@@ -17,12 +17,15 @@ # `CYGWIN` Windows environment variable value **must** include either # `winsymlinks:native` or `winsymlinks:nativestrict`! -# usage: ./update.sh +# usage: ./update.sh [-d|--database PATH] [-n|--dry-run] [-h|--help] set -o errexit set -o nounset set -o pipefail +script_argv0="${BASH_SOURCE[0]}" +script_dir="$( cd "$( dirname "$script_argv0" )" && pwd )" + dump() { local prefix="${FUNCNAME[0]}" @@ -35,8 +38,6 @@ dump() { shift done } - -script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" ensure_symlinks_enabled() { case "${CYGWIN:-}" in @@ -65,6 +66,11 @@ read_database() { } write_database() { + if [ -n "${dry_run+x}" ]; then + dump 'won'"'"'t write the database because it'"'"'s a dry run' + return 0 + fi + > "$database_path" local entry @@ -100,6 +106,11 @@ delete_obsolete_dirs() { return 1 fi + if [ -n "${dry_run+x}" ]; then + dump 'won'"'"'t delete the directory because it'"'"'s a dry run' + return 0 + fi + ( cd "$base_dir" && rmdir -p "$subpath" --ignore-fail-on-non-empty ) } @@ -140,7 +151,13 @@ delete_obsolete_entries() { if [ ! -e "$src_path" ]; then dump " missing source file: $src_path" >&2 - rm -f "$dest_path" + + if [ -z "${dry_run+x}" ]; then + rm -f "$dest_path" + else + dump ' won'"'"'t delete an obsolete symlink, because it'"'"'s a dry run' + fi + unset database["$entry"] local dest_dir @@ -204,8 +221,12 @@ discover_new_entries() { local dest_path="$dest_var_dir${src_path:${#src_var_dir}}" dump " destination file: $dest_path" - mkdir -p "$( dirname "$dest_path" )" - ln --force -s "$src_path" "$dest_path" + if [ -z "${dry_run+x}" ]; then + mkdir -p "$( dirname "$dest_path" )" + ln --force -s "$src_path" "$dest_path" + else + dump ' won'"'"'t create a symlink because it'"'"'s a dry run' + fi database[$entry]=1 done < <( find "$src_var_dir" -type f -print0 ) @@ -213,7 +234,61 @@ discover_new_entries() { done < <( find "$script_dir" -regextype posix-basic -mindepth 1 -maxdepth 1 -type d -regex ".*/$var_name_regex\$" -print0 ) } +exit_with_usage() { + dump "usage: $script_argv0 [-d|--database PATH] [-n|--dry-run] [-h|--help]" + dump 'optional parameters:' + dump ' -d,--database set database file path' + dump ' -n,--dry-run don'"'"'t actually do anything intrusive' + dump ' -h,--help show this message and exit' + exit "${exit_with_usage:-0}" +} + +parse_script_options() { + while [ "$#" -gt 0 ]; do + local key="$1" + shift + + case "$key" in + -h|--help) + exit_with_usage=0 + break + ;; + + -n|--dry-run) + dry_run=1 + continue + ;; + + -d|--database) + ;; + + *) + dump "usage error: unrecognized parameter: $key" >&2 + exit_with_usage=1 + break + ;; + esac + + if [ "$#" -eq 0 ]; then + dump "usage error: missing argument for parameter: $key" >&2 + exit_with_usage=1 + break + fi + + local value="$1" + shift + + case "$key" in + -d|--database) + database_path="$value" + ;; + esac + done +} + main() { + parse_script_options "$@" + [ -n "${exit_with_usage+x}" ] && exit_with_usage ensure_database_exists read_database delete_obsolete_entries @@ -222,4 +297,4 @@ main() { write_database } -main +main "$@" |