fix(unitproc):appendArgTar: Use 'eval' for command strings

[BK-2020-03.git] / unitproc / bktemp-appendArgTar

diff --git a/unitproc/bktemp-appendArgTar b/unitproc/bktemp-appendArgTar
index 400f89e36fef8dea0126c54ade056b77a17443ad..fedd6684ef71506ad8d2e6fac42ea82ff46f2ce9 100644 (file)
--- a/unitproc/bktemp-appendArgTar
+++ b/unitproc/bktemp-appendArgTar
@@ -7,8 +7,8 @@ die() { yell "$*"; exit 111; }
 try() { "$@" || die "cannot $*"; }
 appendArgTar(){
     # Desc: Writes first argument to temporary file with arguments as options, then appends file to tar
-    # Usage: writeArg "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
-    # Version: 1.0.0
+    # Usage: appendArgTar "$(echo "Data to be written.")" [name of file to be inserted] [tar path] [temp dir] ([cmd1] [cmd2] [cmd3] [cmd4]...)
+    # Version: 1.0.3
     # Input: arg1: data to be written
     #        arg2: file name of file to be inserted into tar
     #        arg3: tar archive path (must exist first)
@@ -20,6 +20,7 @@ appendArgTar(){
     #          appendArgTar "$(cat /tmp/largefile2.gpg)" "largefile2" $HOME/archive.tar /tmp "gpg --decrypt" &
     #          appendArgTar "$(cat /tmp/largefile3.gpg)" "largefile3" $HOME/archive.tar /tmp "gpg --decrypt" &
     # Depends: bash 5
+    # Ref/Attrib: Using 'eval' to construct command strings https://askubuntu.com/a/476533
 
     # Save function name
     local FN="${FUNCNAME[0]}";
@@ -40,7 +41,11 @@ appendArgTar(){
     if ! [ -z "$7" ]; then CMD3="$7"; else CMD3="tee /dev/null "; fi # command string 3
     if ! [ -z "$8" ]; then CMD4="$8"; else CMD4="tee /dev/null "; fi # command string 4
 
+    # Input command
+    CMD0="echo \"\$1\""
+
     # # Debug
+    # yell "DEBUG:STATUS:$FN:CMD0:$CMD0"
     # yell "DEBUG:STATUS:$FN:CMD1:$CMD1"
     # yell "DEBUG:STATUS:$FN:CMD2:$CMD2"
     # yell "DEBUG:STATUS:$FN:CMD3:$CMD3"
@@ -50,7 +55,7 @@ appendArgTar(){
     # yell "DEBUG:STATUS:$FN:TMP_DIR:$TMP_DIR"
     
     # Write to temporary working dir
-    echo "$1" | $CMD1 | $CMD2 | $CMD3 | $CMD4 > "$TMP_DIR"/"$FILENAME";
+    eval "$CMD0"" | ""$CMD1"" | ""$CMD2"" | ""$CMD3"" | ""$CMD4" > "$TMP_DIR"/"$FILENAME";
 
     # Append to tar
     try tar --append --directory="$TMP_DIR" --file="$TAR_PATH" "$FILENAME";
@@ -58,10 +63,10 @@ appendArgTar(){
 } # Append Bash var to file appended to Tar archive
 
 #==BEGIN sample code==
-myFile="/tmp/$(date +%s)..original"
-echo "how are you doing?" > "$myFile"
-myVAR="$(cat "$myFile")"
-writeArg "$myVAR" "$myFile..LOUD_CHILD" "tee /tmp/cloneityclone " "tr '[:lower:]' '[:upper:]'"
+myTar="/tmp/$(date +%s).tar";
+try tar --create --file="$myTar" --files-from=/dev/null ;
+myVar="how are you doing?"
+appendArgTar "$myVar" "$(date +%s)..LOUD_insidetar" "$myTar" "/dev/shm" "tee /tmp/$(date +%s)..outsidetar " "tr '[:lower:]' '[:upper:]'"
 #==END sample code==
 
 # Author: Steven Baltakatei Sandoval