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-rwxr-xr-xupdate.sh484
1 files changed, 0 insertions, 484 deletions
diff --git a/update.sh b/update.sh
deleted file mode 100755
index 3d64cb6..0000000
--- a/update.sh
+++ /dev/null
@@ -1,484 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
-# This file is part of the "Configuration file sharing" project.
-# For details, see https://github.com/egor-tensin/config-links.
-# Distributed under the MIT License.
-
-# This script 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`!
-
-# usage: ./update.sh [-h|--help] [-d|--database PATH] [-s|--shared-dir DIR] [-n|--dry-run]
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-dump() {
- local prefix="${FUNCNAME[0]}"
- [ "${#FUNCNAME[@]}" -gt 1 ] && prefix="${FUNCNAME[1]}"
-
- local msg
- for msg; do
- echo "$prefix: $msg"
- done
-}
-
-# Cygwin-related stuff
-
-os="$( uname -o )"
-readonly os
-
-is_cygwin() {
- test "$os" == 'Cygwin'
-}
-
-check_symlinks_enabled_cygwin() {
- case "${CYGWIN-}" in
- *winsymlinks:native*) ;;
- *winsymlinks:nativestrict*) ;;
-
- *)
- dump "native Windows symlinks aren't enabled in Cygwin" >&2
- return 1
- ;;
- esac
-}
-
-# Making sure paths point to files/directories
-
-_traverse_path_usage() {
- local prefix="${FUNCNAME[0]}"
- [ "${#FUNCNAME[@]}" -gt 1 ] && prefix="${FUNCNAME[1]}"
-
- local msg
- for msg; do
- echo "$prefix: $msg"
- done
-
- echo "usage: $prefix [-h|--help] [-0|--null|-z|--zero] [-e|--exist] [-f|--file] [-d|--directory] [--] [PATH]..."
-}
-
-traverse_path() {
- local -a paths=()
-
- local must_exist=
- local type_flag=
- local type_name=
-
- local fmt='%s\n'
-
- while [ "$#" -gt 0 ]; do
- local key="$1"
- shift
-
- case "$key" in
- -h|--help)
- _traverse_path_usage
- return 0
- ;;
- -0|--null|-z|--zero)
- fmt='%s\0'
- ;;
- --)
- break
- ;;
- -e|--exist)
- must_exist=1
- ;;
- -d|--directory)
- type_flag=-d
- type_name="directory"
- ;;
- -f|--file)
- type_flag=-f
- type_name="regular file"
- ;;
- -*)
- _traverse_path_usage "unrecognized parameter: $key" >&2
- return 1
- ;;
- *)
- paths+=("$key")
- ;;
- esac
- done
-
- paths+=("$@")
-
- [ "${#paths[@]}" -eq 0 ] && return 0
-
- if is_cygwin; then
- local i
- for i in "${!paths[@]}"; do
- paths[$i]="$( cygpath -- "${paths[$i]}" )"
- done
- fi
-
- local -a abs_paths=()
-
- local path
- while IFS= read -d '' -r path; do
- if [ -n "$must_exist" ] && [ ! -e "$path" ]; then
- dump "must exist: $path" >&2
- return 1
- fi
-
- if [ -e "$path" ] && [ -n "$type_flag" ] && ! test "$type_flag" "$path"; then
- dump "must be a $type_name: $path" >&2
- return 1
- fi
-
- abs_paths+=("$path")
- done < <( readlink -z --canonicalize-missing -- ${paths[@]+"${paths[@]}"} )
-
- printf -- "$fmt" ${abs_paths[@]+"${abs_paths[@]}"}
-}
-
-# Variable resolution
-
-declare -A cached_paths
-
-resolve_variable() {
- if [ "$#" -ne 1 ]; then
- echo "usage: ${FUNCNAME[0]} VAR_NAME" >&2
- return 1
- fi
-
- local var_name="$1"
-
- if [ -n "${cached_paths[$var_name]+x}" ]; then
- echo "${cached_paths[$var_name]}"
- return 0
- fi
-
- if [ "$var_name" = "$root_var_name" ]; then
- echo ''
- return 0
- fi
-
- if [ -z "${!var_name+x}" ]; then
- dump "variable is not set: $var_name" >&2
- return 1
- fi
-
- local var_path="${!var_name}"
- traverse_path --exist --directory -- "$var_path"
-}
-
-cache_variable() {
- local var_name
- for var_name; do
- [ -n "${cached_paths[$var_name]+x}" ] && continue
- cached_paths[$var_name]="$( resolve_variable "$var_name" )"
- done
-}
-
-readonly root_var_name='CONFIG_LINKS_ROOT'
-readonly var_name_regex='%\([_[:alpha:]][_[:alnum:]]*\)%'
-
-extract_variable_name() {
- local s
- for s; do
- local var_name
- if ! var_name="$( expr "$s" : "$var_name_regex/" )"; then
- dump "couldn't extract variable name from: $s" >&2
- return 1
- fi
- echo "$var_name"
- done
-}
-
-# Shared directory settings
-
-shared_dir="$( pwd )"
-
-update_shared_dir() {
- if [ "$#" -ne 1 ]; then
- echo "usage: ${FUNCNAME[0]} DIR" >&2
- return 1
- fi
-
- local new_shared_dir
- new_shared_dir="$( traverse_path --exist --directory -- "$1" )"
-
- [ "$db_path" == "$shared_dir/$default_db_name" ] \
- && db_path="$new_shared_dir/$default_db_name"
-
- shared_dir="$new_shared_dir"
-}
-
-# Database maintenance
-
-readonly default_db_name='links.bin'
-db_path="$shared_dir/$default_db_name"
-declare -A database
-
-update_database_path() {
- if [ "$#" -ne 1 ]; then
- echo "usage: ${FUNCNAME[0]} PATH" >&2
- return 1
- fi
-
- db_path="$( traverse_path --file -- "$1" )"
-
- local db_dir
- db_dir="$( dirname -- "$db_path" )"
- mkdir -p -- "$db_dir"
-}
-
-ensure_database_exists() {
- [ -f "$db_path" ] || is_dry_run || > "$db_path"
-}
-
-read_database() {
- [ ! -f "$db_path" ] && is_dry_run && return 0
-
- local entry
- while IFS= read -d '' -r entry; do
- database[$entry]=1
- done < "$db_path"
-}
-
-write_database() {
- is_dry_run && return 0
-
- > "$db_path"
-
- local entry
- for entry in "${!database[@]}"; do
- printf -- '%s\0' "$entry" >> "$db_path"
- done
-}
-
-delete_obsolete_dirs() {
- if [ "$#" -ne 2 ]; then
- echo "usage: ${FUNCNAME[0]} BASE_DIR DIR" >&2
- return 1
- fi
-
- is_dry_run && return 0
-
- local base_dir="$1"
- local dir="$2"
-
- base_dir="$( traverse_path --exist --directory -- "$base_dir" )"
- dir="$( traverse_path --exist --directory -- "$dir" )"
-
- [ "$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 --ignore-fail-on-non-empty -- "$subpath" )
-}
-
-delete_obsolete_entries() {
- local entry
- for entry in "${!database[@]}"; do
- dump "entry: $entry"
- unset -v 'database[$entry]'
-
- local var_name
- var_name="$( extract_variable_name "$entry" )" || continue
- cache_variable "$var_name"
-
- local symlink_var_dir
- symlink_var_dir="$( resolve_variable "$var_name" )" || continue
- local shared_var_dir="$shared_dir/%$var_name%"
- local subpath="${entry#%$var_name%/}"
- local symlink_path="$symlink_var_dir/$subpath"
- local shared_path="$shared_var_dir/$subpath"
-
- dump " shared file path: $shared_path"
- dump " symlink path: $symlink_path"
-
- if [ ! -L "$shared_path" ] && [ ! -e "$shared_path" ]; then
- dump ' the shared file is missing, so going to delete the symlink'
- is_dry_run && continue
-
- if [ ! -L "$symlink_path" ]; then
- dump " not a symlink or doesn't exist, so won't delete"
- continue
- fi
-
- local target_path
- target_path="$( traverse_path -- "$symlink_path" )"
-
- if [ "$shared_path" != "$target_path" ]; then
- dump " doesn't point to the shared file, so won't delete"
- continue
- fi
-
- rm -f -- "$symlink_path"
-
- local symlink_dir
- symlink_dir="$( dirname -- "$symlink_path" )"
- delete_obsolete_dirs "$symlink_var_dir" "$symlink_dir" || true
-
- continue
- fi
-
- if [ ! -L "$symlink_path" ]; then
- dump " not a symlink or doesn't exist"
- continue
- fi
-
- local target_path
- target_path="$( traverse_path -- "$symlink_path" )"
-
- if [ "$target_path" != "$shared_path" ]; then
- dump " doesn't point to the shared file"
- continue
- fi
-
- dump ' ... points to the shared file'
- database[$entry]=1
- done
-}
-
-discover_new_entries() {
- local shared_var_dir
- while IFS= read -d '' -r shared_var_dir; do
- dump "shared directory: $shared_dir/$shared_var_dir"
-
- local var_name
- var_name="$( extract_variable_name "$shared_var_dir" )"
- cache_variable "$var_name"
-
- shared_var_dir="$shared_dir/$shared_var_dir"
-
- local symlink_var_dir
- symlink_var_dir="$( resolve_variable "$var_name" )" || continue
- dump " symlinks directory: $symlink_var_dir"
-
- local shared_path
- while IFS= read -d '' -r shared_path; do
- dump " shared file path: $shared_path"
-
- local entry="%$var_name%/${shared_path:${#shared_var_dir}}"
-
- if [ -n "${database[$entry]+x}" ]; then
- dump ' ... already has a symlink'
- continue
- fi
-
- local subpath="${shared_path:${#shared_var_dir}}"
- local symlink_path="$symlink_var_dir/$subpath"
-
- dump " symlink path: $symlink_path"
-
- is_dry_run && continue
-
- local symlink_dir
- symlink_dir="$( dirname -- "$symlink_path" )"
- mkdir -p -- "$symlink_dir"
- ln -f -s --no-target-directory -- "$shared_path" "$symlink_path"
-
- database[$entry]=1
- done < <( find "$shared_var_dir" -type f -print0 )
-
- done < <( find "$shared_dir" -regextype posix-basic -mindepth 1 -maxdepth 1 -type d -regex ".*/$var_name_regex\$" -printf '%P/\0' )
-}
-
-# Main routines
-
-script_name="$( basename -- "${BASH_SOURCE[0]}" )"
-readonly script_name
-
-script_usage() {
- local msg
- for msg; do
- echo "$script_name: $msg"
- done
-
- echo "usage: $script_name [-h|--help] [-d|--database PATH] [-s|--shared-dir DIR] [-n|--dry-run]
- -h,--help show this message and exit
- -d,--database set database file path
- -s,--shared-dir set top-level shared directory path
- (current working directory by default)
- -n,--dry-run don't actually do anything intrusive"
-}
-
-parse_script_options() {
- while [ "$#" -gt 0 ]; do
- local key="$1"
- shift
-
- case "$key" in
- -h|--help)
- script_usage
- exit 0
- ;;
- -n|--dry-run)
- dry_run=1
- continue
- ;;
- -d|--database|-s|--shared-dir)
- ;;
- *)
- script_usage "unrecognized parameter: $key" >&2
- exit 1
- ;;
- esac
-
- if [ "$#" -eq 0 ]; then
- script_usage "missing argument for parameter: $key" >&2
- exit 1
- fi
-
- local value="$1"
- shift
-
- case "$key" in
- -d|--database)
- update_database_path "$value"
- ;;
- -s|--shared-dir)
- update_shared_dir "$value"
- ;;
- *)
- script_usage "unrecognized parameter: $key" >&2
- exit 1
- ;;
- esac
- done
-}
-
-is_dry_run() {
- test -n "${dry_run+x}"
-}
-
-check_symlinks_enabled() {
- if is_cygwin; then
- check_symlinks_enabled_cygwin
- else
- return 0
- fi
-}
-
-main() {
- parse_script_options "$@"
- check_symlinks_enabled
- ensure_database_exists
- read_database
- delete_obsolete_entries
- discover_new_entries
- write_database
-}
-
-main "$@"
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 20:18:57 +0000