From dcabe75887d0560e82d22555cb1ef6c320f0c367 Mon Sep 17 00:00:00 2001 From: Martin Winkler Date: Sun, 20 Mar 2022 14:33:39 +0100 Subject: [PATCH] Beta stage: traverses through /**/* without error (some files excluded; see test/totest.sh) --- rdlink.sh | 84 +++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 66 insertions(+), 18 deletions(-) diff --git a/rdlink.sh b/rdlink.sh index 29e60b7..f951514 100755 --- a/rdlink.sh +++ b/rdlink.sh @@ -18,14 +18,45 @@ LOG_LEVEL="${LOG_LEVEL:-1}" # 7 = debug -> 0 = emergency rl::rdlink() { local subject= + local work= + local resolved=0 info "pwd: $(pwd)" info "Processing... $@" subject="$(rl::normalize "${1:-}")" || true # Follow multiple symlinks - while subject="$(rl::quicklink "${subject}")" ; do : ; done - subject="$(rl::canon "${subject}")" || true + while subject="$(rl::quicklink "${subject}")" ; do + # A link was resolved at least once + info "rl::rdlink - Link found: $subject" + resolved=1 + done + + # Special cases handling + { + # If subject is still a link, after rl::quicklink call(s) + # current user has no permission to access the link itself + # (e.g. /proc/**/cwd) + if [ -L "${subject}" ] ; then + info "rl::rdlink exit - can't access link ${subject}" + printf "\n" + return 1 + fi + } + + # Empty output if (dirname $subject) is not a valid path + if ! work="$(rl::canon "${subject}")" ; then + # Special: Links resolved to something like: /proc/2267178/fd/pipe:[22306727] + # are not existing files but `readlink -f` prints result anyway + # Printing result if a link was resolved at least once + if (( ! resolved )); then + info "rl::rdlink exit - invalid path ${subject}" + printf "\n" + return 1 + fi + else + subject="${work}" + fi printf "${subject}\n" } @@ -43,13 +74,13 @@ rl::quicklink() { fi info " - symlink ${1} -> ${subject}" - # relative target; append root + # relative symlink target; prepend its parent direcotry if [[ "${subject}" != "/"* ]]; then work="$(rl::canon "$(dirname -- "${1:-}")")" subject="${work}/${subject}" info " - relative link resolved: ${subject}" fi - + printf "${subject}\n" return 0 } @@ -61,23 +92,40 @@ rl::canon() { info "Canonicalize path... ${1:-}" if work="$(cd "${1:-}" >/dev/null 2>&1 && pwd -P)" ; then - subject="${work}" + # Special: `pwd -P` returns with // as root for links starting at / + # e.g. $(readlink /proc/self/root) == "/" + # $(cd /proc/self/root/mnt && pwd -P) == "//mnt" + subject="$(rl::normalize "${work}")" info " - directory: ${subject}" elif work="$(cd "$(dirname -- "${1:-}")" >/dev/null 2>&1 && pwd -P)" ; then bname="$(basename -- "${1:-}")" + + # Special: / produces // + [[ "${work}" == "/" ]] && work= + subject="${work}${bname:+"/${bname}"}" info " - parent: ${subject}" else - info " - no hit" + info " - no hit for: ${1:-}" subject="${1:-}" + return 1 fi - printf "${subject}\n" + printf -- "${subject}\n" + return 0 } rl::normalize() { + local work= info "Normalizing... ${1:-}" - printf -- "${1:-}\n" + + work="${1:-}" + # Remove multiple / + while [[ "${work:-}" = *"//"* ]]; do + work="${work//'//'/'/'}" + done + + printf -- "${work}\n" } rl::main() { @@ -118,20 +166,20 @@ function rl::log () { printf "%s [%9s] %s\n" "$(date -u +"%Y-%m-%d %H:%M:%S UTC")" "${log_level}" "${log_line}" 1>&2 done <<< "${@:-}" } -emergency () { rl::log emergency "${@}"; exit 1; } -alarm() { [[ "${LOG_LEVEL:-0}" -ge 1 ]] && rl::log alert "${@}"; true; } -critical () { [[ "${LOG_LEVEL:-0}" -ge 2 ]] && rl::log critical "${@}"; true; } -error () { [[ "${LOG_LEVEL:-0}" -ge 3 ]] && rl::log error "${@}"; true; } -warning () { [[ "${LOG_LEVEL:-0}" -ge 4 ]] && rl::log warning "${@}"; true; } -notice () { [[ "${LOG_LEVEL:-0}" -ge 5 ]] && rl::log notice "${@}"; true; } -info () { [[ "${LOG_LEVEL:-0}" -ge 6 ]] && rl::log info "${@}"; true; } -debug () { [[ "${LOG_LEVEL:-0}" -ge 7 ]] && rl::log debug "${@}"; true; } -msg () { echo "$@"; true; } +emergency() { rl::log emergency "${@}"; exit 1; } +alarm() { [[ "${LOG_LEVEL:-0}" -ge 1 ]] && rl::log alert "${@}"; true; } +critical() { [[ "${LOG_LEVEL:-0}" -ge 2 ]] && rl::log critical "${@}"; true; } +error() { [[ "${LOG_LEVEL:-0}" -ge 3 ]] && rl::log error "${@}"; true; } +warning() { [[ "${LOG_LEVEL:-0}" -ge 4 ]] && rl::log warning "${@}"; true; } +notice() { [[ "${LOG_LEVEL:-0}" -ge 5 ]] && rl::log notice "${@}"; true; } +info() { [[ "${LOG_LEVEL:-0}" -ge 6 ]] && rl::log info "${@}"; true; } +debug() { [[ "${LOG_LEVEL:-0}" -ge 7 ]] && rl::log debug "${@}"; true; } +msg() { echo "$@"; true; } # Provide as function to be called when sourced rdlink() { - rl::main "$@" + rl::rdlink "$@" } ### Check if script is _sourced