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-rwxr-xr-xupdate.sh192
1 files changed, 91 insertions, 101 deletions
diff --git a/update.sh b/update.sh
index 3c2b0fd..c61b07c 100755
--- a/update.sh
+++ b/update.sh
@@ -60,7 +60,7 @@ dump() {
done
}
-resolve_path() {
+traverse_path() {
local -a paths
local exit_with_usage=
@@ -68,6 +68,8 @@ resolve_path() {
local type_flag=
local type_name=
+ local fmt='%s\n'
+
while [ "$#" -gt 0 ]; do
local key="$1"
shift
@@ -77,6 +79,9 @@ resolve_path() {
exit_with_usage=0
break
;;
+ -z|-0|--zero)
+ fmt='%s\0'
+ ;;
--)
break
;;
@@ -115,6 +120,7 @@ resolve_path() {
while IFS= read -d '' -r path; do
if [ -n "$must_exist" ] && [ ! -e "$path" ]; then
dump "must exist: $path" >&2
+ return 1
fi
if [ -e "$path" ] && [ -n "$type_flag" ] && ! test "$type_flag" "$path"; then
@@ -122,7 +128,7 @@ resolve_path() {
return 1
fi
- echo "$path"
+ printf -- "$fmt" "$path"
done < <( readlink -z --canonicalize-missing -- ${paths[@]+"${paths[@]}"} )
}
@@ -149,22 +155,32 @@ resolve_variable() {
fi
local var_path="${!var_name}"
- resolve_path --exist --directory -- "$var_path"
+ 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
}
-check_symlinks_enabled() {
- if is_cygwin; then
- check_symlinks_enabled_cygwin
- else
- return 0
- fi
+readonly var_name_regex='%\([_[:alpha:]][_[:alnum:]]*\)%'
+
+extract_variable_name() {
+ local s
+ for s; do
+ local var_name
+ var_name="$( expr "$s" : "$var_name_regex/" )"
+
+ if [ -z "$var_name" ]; then
+ dump "couldn't extract variable name from: $s" >&2
+ return 1
+ fi
+
+ echo "$var_name"
+ done
}
# Shared directory settings
@@ -178,7 +194,7 @@ update_shared_dir() {
fi
local new_shared_dir
- new_shared_dir="$( resolve_path --exist --directory -- "$1" )"
+ new_shared_dir="$( traverse_path --exist --directory -- "$1" )"
[ "$db_path" == "$shared_dir/$default_db_fn" ] \
&& db_path="$new_shared_dir/$default_db_fn"
@@ -198,12 +214,12 @@ update_database_path() {
return 1
fi
- db_path="$( resolve_path --file -- "$1" )"
+ db_path="$( traverse_path --file -- "$1" )"
mkdir -p -- "$( dirname -- "$db_path" )"
}
ensure_database_exists() {
- [ -f "$db_path" ] || is_dry_run || touch "$db_path"
+ [ -f "$db_path" ] || is_dry_run || > "$db_path"
}
read_database() {
@@ -216,10 +232,7 @@ read_database() {
}
write_database() {
- if is_dry_run; then
- dump "won't write the database because it's a dry run"
- return 0
- fi
+ is_dry_run && return 0
> "$db_path"
@@ -235,21 +248,13 @@ delete_obsolete_dirs() {
return 1
fi
+ is_dry_run && return 0
+
local base_dir="$1"
local dir="$2"
- if [ ! -d "$base_dir" ]; then
- dump "base directory doesn't exist: $base_dir" >&2
- return 1
- fi
-
- if [ ! -d "$dir" ]; then
- dump "directory doesn't exist: $dir" >&2
- return 1
- fi
-
- base_dir="$( resolve_path --exist --directory -- "$base_dir" )"
- dir="$( resolve_path --exist --directory -- "$dir" )"
+ base_dir="$( traverse_path --exist --directory -- "$base_dir" )"
+ dir="$( traverse_path --exist --directory -- "$dir" )"
[ "$base_dir" == "$dir" ] && return 0
@@ -261,136 +266,113 @@ delete_obsolete_dirs() {
return 1
fi
- if is_dry_run; then
- dump "won't delete the directory because it's a dry run"
- return 0
- fi
-
( cd "$base_dir" && rmdir -p --ignore-fail-on-non-empty -- "$subpath" )
}
-readonly var_name_regex='%\([_[:alpha:]][_[:alnum:]]*\)%'
-
-extract_variable_name() {
- local s
- for s; do
- local var_name
- var_name="$( expr "$s" : "$var_name_regex/" )"
-
- if [ -z "$var_name" ]; then
- dump "couldn't extract variable name from: $s" >&2
- return 1
- fi
-
- echo "$var_name"
- done
-}
-
delete_obsolete_entries() {
local entry
for entry in "${!database[@]}"; do
dump "entry: $entry"
+ unset -v 'database[$entry]'
local var_name
- if ! var_name="$( extract_variable_name "$entry" )"; then
- unset -v 'database[$entry]'
- continue
- fi
+ var_name="$( extract_variable_name "$entry" )" || continue
cache_variable "$var_name"
local symlink_var_dir
- if ! symlink_var_dir="$( resolve_variable "$var_name" )"; then
- unset -v 'database[$entry]'
- continue
- fi
+ symlink_var_dir="$( 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/$subpath"
- if [ ! -e "$shared_path" ]; then
- dump " missing source file: $shared_path" >&2
+ 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, so won't delete: $symlink_path"
- elif is_dry_run; then
- dump " won't delete an obsolete symlink, because it's a dry run"
- else
- rm -f -- "$symlink_path"
+ dump " not a symlink or doesn't exist, so won't delete"
+ continue
+ fi
- local symlink_dir
- symlink_dir="$( dirname -- "$symlink_path" )"
+ local target_path
+ target_path="$( traverse_path -- "$symlink_path" )"
- delete_obsolete_dirs "$symlink_var_dir" "$symlink_dir" || true
+ if [ "$shared_path" != "$target_path" ]; then
+ dump " doesn't point to the shared file, so won't delete"
+ continue
fi
- unset -v 'database[$entry]'
+ rm -f -- "$symlink_path"
+
+ local symlink_dir
+ symlink_dir="$( dirname -- "$symlink_path" )"
+
+ delete_obsolete_dirs "$symlink_var_dir" "$symlink_dir" || true
continue
fi
- if [ ! -L "$symlink_path" ] || [ ! -e "$symlink_path" ]; then
- dump " not a symlink or doesn't exist: $symlink_path" >&2
- unset -v 'database[$entry]'
+ if [ ! -L "$symlink_path" ]; then
+ dump " not a symlink or doesn't exist"
continue
fi
local target_path
- target_path="$( resolve_path -- "$symlink_path" )"
+ target_path="$( traverse_path -- "$symlink_path" )"
if [ "$target_path" != "$shared_path" ]; then
- dump " points to a wrong file: $symlink_path" >&2
- unset -v 'database[$entry]'
+ dump " doesn't point to the shared file"
continue
fi
- dump ' ... points to the right file'
+ 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 "source directory: $shared_var_dir"
+ dump "shared directory: $shared_dir/$shared_var_dir"
local var_name
- var_name="$( basename -- "$shared_var_dir" )"
- var_name="$( expr "$var_name" : "$var_name_regex" )"
- dump " variable name: $var_name"
+ var_name="$( extract_variable_name "$shared_var_dir" )"
cache_variable "$var_name"
+ shared_var_dir="$shared_dir/$shared_var_dir"
+
local symlink_var_dir
- if ! symlink_var_dir="$( resolve_variable "$var_name" )"; then
- continue
- fi
- dump " destination directory: $symlink_var_dir"
+ symlink_var_dir="$( resolve_variable "$var_name" )" || continue
+ dump " symlinks directory: $symlink_var_dir"
local shared_path
while IFS= read -d '' -r shared_path; do
- dump " source file: $shared_path"
+ dump " shared file path: $shared_path"
- local entry="%$var_name%${shared_path:${#shared_var_dir}}"
+ local entry="%$var_name%/${shared_path:${#shared_var_dir}}"
if [ -n "${database[$entry]+x}" ]; then
- dump ' ... points to the right file'
+ dump ' ... already has a symlink'
continue
fi
- local symlink_path="$symlink_var_dir${shared_path:${#shared_var_dir}}"
- dump " destination file: $symlink_path"
+ local subpath="${shared_path:${#shared_var_dir}}"
+ local symlink_path="$symlink_var_dir/$subpath"
- if is_dry_run; then
- dump " won't create a symlink because it's a dry run"
- else
- mkdir -p -- "$( dirname -- "$symlink_path" )"
- ln -f -s -- "$shared_path" "$symlink_path"
- fi
+ dump " symlink path: $symlink_path"
+
+ is_dry_run && continue
+
+ mkdir -p -- "$( dirname -- "$symlink_path" )"
+ ln -f -s --no-target-directory -- "$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 ".*/$var_name_regex\$" -print0 )
+ done < <( find "$shared_dir" -regextype posix-basic -mindepth 1 -maxdepth 1 -type d -regex ".*/$var_name_regex\$" -printf '%P/\0' )
}
# Main routines
@@ -429,14 +411,14 @@ parse_script_options() {
;;
*)
- dump "usage error: unrecognized parameter: $key" >&2
+ dump "unrecognized parameter: $key" >&2
exit_with_usage=1
break
;;
esac
if [ "$#" -eq 0 ]; then
- dump "usage error: missing argument for parameter: $key" >&2
+ dump "missing argument for parameter: $key" >&2
exit_with_usage=1
break
fi
@@ -454,7 +436,7 @@ parse_script_options() {
;;
*)
- dump "usage error: unrecognized parameter: $key" >&2
+ dump "unrecognized parameter: $key" >&2
exit_with_usage=1
break
;;
@@ -466,6 +448,14 @@ is_dry_run() {
test -n "${dry_run+x}"
}
+check_symlinks_enabled() {
+ if is_cygwin; then
+ check_symlinks_enabled_cygwin
+ else
+ return 0
+ fi
+}
+
main() {
parse_script_options "$@"
[ -n "${exit_with_usage+x}" ] && exit_with_usage