BUG: make 'untar' work when extracting a single directory starting wi…

…th './' (#6)

src/io/untar/config.vsh.yaml

@@ -33,8 +33,4 @@ test_resources:
     path: test.sh
 engines:
   - type: docker
-    image: alpine:latest
-    setup:
-      - type: apk
-        packages:
-          - bash
+    image: debian:stable-slim

src/io/untar/script.sh

@@ -4,17 +4,27 @@ set -eo pipefail
 
 extra_args=()
 
+TMPDIR=$(mktemp -d "$meta_temp_dir/$meta_functionality_name-XXXXXX")
+function clean_up {
+  [[ -d "$TMPDIR" ]] && rm -r "$TMPDIR"
+}
+trap clean_up EXIT
 
 # Check if tarball contains 1 top-level directory. If so, extract the contents of the
 # directory to the output directory instead of the directory itself.
 echo "Directory contents:"
-tar -taf "${par_input}" 
+tar -taf "${par_input}" > "$TMPDIR/tar_contents.txt"
+cat "$TMPDIR/tar_contents.txt"
 
 printf "Checking if tarball contains only a single top-level directory: "
-if [[ $(tar -taf ${par_input} | grep -o -E "^.*?\\/" | uniq | wc -l) -eq 1 ]]; then
+if [[ $(grep -o -E "^.*?\\/" "$TMPDIR/tar_contents.txt" | uniq | wc -l) -eq 1 ]]; then
     echo "It does."
     echo "Extracting the contents of the top-level directory to the output directory instead of the directory itself."
-    extra_args+=("--strip-components=1")
+    # The directory can be both of the format './<directory>' (or ././<directory>) or just <directory>
+    # Adjust the number of stripped components accordingly by looking for './' at the beginning of the file.
+    starting_relative=$(grep -oP -m 1 '^(./)*' "$TMPDIR/tar_contents.txt" | tr -d '\n' | wc -c)
+    n_strips=$(( ($starting_relative / 2)+1 ))
+    extra_args+=("--strip-components=$n_strips")
 else
     echo "It does not."
 fi
@@ -26,5 +36,6 @@ fi
 
 echo "Starting extraction of tarball '$par_input' to output directory '$par_output'."
 mkdir -p "$par_output"
+echo "executing 'tar --directory=$par_output ${extra_args[@]} -xavf $par_input'"
 tar --directory="$par_output" ${extra_args[@]} -xavf "$par_input"
 

src/io/untar/test.sh

@@ -8,6 +8,7 @@ TMPDIR=$(mktemp -d "$meta_temp_dir/$meta_functionality_name-XXXXXX")
 function clean_up {
   [[ -d "$TMPDIR" ]] && rm -r "$TMPDIR"
 }
+trap clean_up EXIT
 echo ">>> Created temporary directory '$TMPDIR'."
 
 INPUT_FILE="$TMPDIR/test_file.txt"
@@ -17,7 +18,7 @@ echo ">>> Created '$INPUT_FILE'."
 
 echo ">>> Creating tar.gz from '$INPUT_FILE'."
 TARFILE="${INPUT_FILE}.tar.gz"
-tar czvf ${INPUT_FILE}.tar.gz $(basename "$INPUT_FILE") -C "$TMPDIR"
+tar -C "$TMPDIR" -czvf ${INPUT_FILE}.tar.gz $(basename "$INPUT_FILE")
 [[ ! -f "$TARFILE" ]] && echo ">>> Test setup failed: could not create tarfile." && exit 1
 echo ">>> '$TARFILE' created."
 
@@ -50,7 +51,7 @@ echo ">>> Check whether excluded file was not extracted"
 echo ">>> Creating test tarball containing only 1 top-level directory."
 mkdir "$TMPDIR/input_test_3/"
 cp "$INPUT_FILE" "$TMPDIR/input_test_3/"
-tar czvf "$TMPDIR/input_test_3.tar.gz" $(basename "$TMPDIR/input_test_3") -C "$TMPDIR"
+tar -C "$TMPDIR" -czvf "$TMPDIR/input_test_3.tar.gz" $(basename "$TMPDIR/input_test_3")
 TARFILE_3="$TMPDIR/input_test_3.tar.gz"
 
 echo ">>> Creating temporary output directory for test 3."
@@ -65,4 +66,23 @@ echo "Extracting '$TARFILE_3' to '$OUTPUT_DIR_3'".
 echo ">>> Check whether extracted file exists"
 [[ ! -f "$OUTPUT_DIR_3/test_file.txt" ]] && echo "Output file could not be found!" && exit 1
 
+echo ">>> Check for tar archive that contains a single directory starting with './'."
+mkdir "$TMPDIR/input_test_4/"
+cp "$INPUT_FILE" "$TMPDIR/input_test_4/"
+
+pushd "$TMPDIR/" 
+trap popd ERR
+tar -czvf "$TMPDIR/input_test_4.tar.gz" ./input_test_4
+popd
+trap - ERR
+
+OUTPUT_DIR_4="$TMPDIR/output_test_4/"
+echo "Extracting '$TMPDIR/input_test_4.tar.gz' to '$OUTPUT_DIR_4'".
+./$meta_functionality_name \
+   --input "$TMPDIR/input_test_4.tar.gz" \
+   --output "$OUTPUT_DIR_4"
+
+echo ">>> Check whether extracted file exists"
+[[ ! -f "$OUTPUT_DIR_4/test_file.txt" ]] && echo "Output file could not be found!" && exit 1
+
 echo ">>> Test finished successfully"