Address shellcheck checks

.github/workflows/base-tests.yaml

@@ -49,7 +49,7 @@ jobs:
         run: |
           find . -name .git -prune -o -type f \
             '!' '(' -name '*.txt' -o -name '*.md' ')' \
-            -exec grep -q -m1 '^#!/bin/.*sh' {} ';' \
+            -exec grep -q -m1 '^#!/bin/\(ba\|da\|k\)\?sh' {} ';' \
             -print0 \
           | xargs -0 shellcheck
 

scripts/freeze_versions

@@ -127,12 +127,12 @@ for arg in "$@"; do
 			# we were specified precisely with extension etc
 			imgpath="$imgprefix"
 		else
-			imgpaths=( $(/bin/ls -1 "$imgprefix".*) )
+			mapfile -t imgpaths < <( /bin/ls -1 "$imgprefix".* )
 			case ${#imgpaths[@]} in
 				0) error "There is no ${imgprefix}.* files.  Available images for the app are:"
 				   /bin/ls -1 "$topd/images/${img%%-*}/${img}--"* | sed -e 's,^,  ,g' 1>&2
 				   exit 1;;
-				1) imgpath=$(realpath -ms --relative-to="${save_ds:-.}" ${imgpaths[0]});;  # already would include topd
+				1) imgpath=$(realpath -ms --relative-to="${save_ds:-.}" "${imgpaths[0]}");;  # already would include topd
 				*) error "There are multiple images available. Include extension into your version specification. Available images are:"
 				   echo "${imgpaths[@]}" | sed -e 's, ,\n  ,g' -e 's,^,  ,g'
 				   exit 1;;
@@ -149,13 +149,13 @@ for arg in "$@"; do
 	# if it was a copy into some other super-dataset, we should copy some other fields
 	if [ -n "$topd_rel" ]; then
     # if copying to some other dataset, procedure is different, since we need to copy all
-    git config -f $topd/.datalad/config --get-regexp "containers.${img}\." \
-    | while read var value; do
+    git config -f "$topd"/.datalad/config --get-regexp "containers.${img}\." \
+    | while read -r var value; do
       case "${var##*.}" in
         image) continue;;  # already done above, skip
         cmdexec)
           if echo "$value" | grep -q '^{img_dspath}/'; then
-            value=$(echo "$value" | sed -e "s,{img_dspath}/,{img_dspath}/$topd_rel,g")
+            value="${value//{img_dspath}\//{img_dspath}\/$topd_rel}"
           else
             value="$topd_rel$value"
           fi;;