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-rw-r--r--src/common.sh22
-rw-r--r--src/db.sh201
-rw-r--r--src/path.sh94
-rw-r--r--src/vars.sh58
4 files changed, 375 insertions, 0 deletions
diff --git a/src/common.sh b/src/common.sh
new file mode 100644
index 0000000..18df4ce
--- /dev/null
+++ b/src/common.sh
@@ -0,0 +1,22 @@
+# 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.
+
+dump() {
+ local prefix="${FUNCNAME[0]}"
+ [ "${#FUNCNAME[@]}" -gt 1 ] && prefix="${FUNCNAME[1]}"
+
+ local msg
+ for msg; do
+ echo "$prefix: $msg"
+ done
+}
+
+set_dry_run() {
+ dry_run=1
+}
+
+is_dry_run() {
+ test -n "${dry_run+x}"
+}
diff --git a/src/db.sh b/src/db.sh
new file mode 100644
index 0000000..6d733ef
--- /dev/null
+++ b/src/db.sh
@@ -0,0 +1,201 @@
+# 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.
+
+# 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' )
+}
diff --git a/src/path.sh b/src/path.sh
new file mode 100644
index 0000000..b1b1e8f
--- /dev/null
+++ b/src/path.sh
@@ -0,0 +1,94 @@
+# 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.
+
+# 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[@]}"}
+}
diff --git a/src/vars.sh b/src/vars.sh
new file mode 100644
index 0000000..d74506b
--- /dev/null
+++ b/src/vars.sh
@@ -0,0 +1,58 @@
+# 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.
+
+# 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
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 15:08:38 +0000