refactor: small optimalizations

devc.sh

@@ -5,7 +5,7 @@
 # different dev containers, resuming sessions and #
 # automatic container updates.                    #
 # =============================================== #
-set -eu
+set -euo pipefail
 log() { printf '\e[%sm%s\e[0m %s\n' "${3:-36}" "${2:-○}" "$1"; }
 arg() { echo -n " $@"; }
 
@@ -69,9 +69,8 @@ param_args() {
       arg "-e XAUTHORITY=/run/user/1000/.Xauthority"
       ;;
     -mnt) # Mount directory.
+      arg "-w /mnt/ -v $2:/mnt/$([ ! -d "$2" ] && echo 'file')"
       shift
-      arg "-w /mnt/"
-      arg "-v $1:/mnt/$([ ! -d "$1" ] && echo 'file')"
       ;;
     *) # Use unknown arguments as container arguments.
       arg "$1" ;;
@@ -101,24 +100,21 @@ name="${image%:*}"
 
 # Get container registry from the DEVC_REGISTRY env
 # variable.
-if [ -n "${DEVC_REGISTRY:-}" ]; then
-  registry="$DEVC_REGISTRY"
-else
+registry="${DEVC_REGISTRY:-}"
+if [ -z "$registry" ]; then
   log "registry unknown; set the DEVC_REGISTRY environment variable" 'x' 31
   exit 1
 fi
 
 # Get container command from the DEVC_COMMAND env variable
 # if set, else use bash -l.
-if [ -z "${DEVC_COMMAND:-}" ]; then
-  DEVC_COMMAND="bash -l"
-fi
+DEVC_COMMAND="${DEVC_COMMAND:-bash -l}"
 
 # When container is not running or arguments are provided,
 # recreate it.
 if [ "$($engine container inspect "$name" -f {{.State.Running}} 2>&1)" != 'true' ] || [[ $# -gt 0 ]]; then
-  log "starting devcontainer..."
-  $engine network create --ignore "devc"
+  log "starting $image..."
+  $engine network create --ignore "devc" 1>/dev/null
   $engine container rm -f -t 0 "$name" 1>/dev/null
   $engine run -td $(default_args) $(param_args $@) "$registry/$image"
 fi