feat(unitproc/bknpass):Make portable if script used in bash function

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

diff --git a/unitproc/bktemp-checkMakeTar b/unitproc/bktemp-checkMakeTar
index a1dc31208fddce40496b828ccb00c760761d9dd6..07cec787b146360fefc30b004f2abdc5fcfa95b8 100644 (file)
--- a/unitproc/bktemp-checkMakeTar
+++ b/unitproc/bktemp-checkMakeTar
@@ -1,44 +1,56 @@
 #!/bin/bash
-
 # Desc: Checks that a valid tar archive exists, creates one otherwise
 
-
+#===BEGIN Declare local script functions===
 yell() { echo "$0: $*" >&2; }      #o Yell, Die, Try Three-Fingered Claw technique
 die() { yell "$*"; exit 111; }     #o Ref/Attrib: https://stackoverflow.com/a/25515370
 try() { "$@" || die "cannot $*"; } #o
-
-#===BEGIN Declare local script functions===
 checkMakeTar() {
     # Desc: Checks that a valid tar archive exists, creates one otherwise
     # Usage: checkMakeTar [ path ]
+    # Version: 1.0.2
     # Input: arg1: path of tar archive
-    # Output: exit code 0 (even if tar had to be created)
-    # Depends: try, tar, date
-    local PATH_TAR="$1"
+    # Output: exit code 0 : tar readable
+    #         exit code 1 : tar missing; created
+    #         exit code 2 : tar not readable; moved; replaced
+    # Depends: bash 5, date 8, tar 1, try()
+    local pathTar returnFlag0 returnFlag1 returnFlag2
+    pathTar="$1";
 
     # Check if file is a valid tar archive
-    if tar --list --file="$PATH_TAR" 1>/dev/null 2>&1; then
+    if tar --list --file="$pathTar" 1>/dev/null 2>&1; then
        ## T1: return success
-       return 0;
+       returnFlag0="tar valid";
     else
        ## F1: Check if file exists
-       if [[ -f "$PATH_TAR" ]]; then
+       if [[ -f "$pathTar" ]]; then
            ### T: Rename file
-           try mv "$PATH_TAR" "$PATH_TAR""--broken--""$(date +%Y%m%dT%H%M%S)";
+           try mv "$pathTar" "$pathTar""--broken--""$(date +%Y%m%dT%H%M%S)" && \
+               returnFlag1="tar moved";
        else
            ### F: -
            :
-       fi
+       fi;
        ## F2: Create tar archive, return 0
-       try tar --create --file="$PATH_TAR" --files-from=/dev/null;
+       try tar --create --file="$pathTar" --files-from=/dev/null && \
+           returnFlag2="tar created";
+    fi;
+    
+    # Determine function return code
+    if [[ "$returnFlag0" = "tar valid" ]]; then
        return 0;
-    fi
+    elif [[ "$returnFlag2" = "tar created" ]] && ! [[ "$returnFlag1" = "tar moved" ]]; then
+       return 1; # tar missing so created
+    elif [[ "$returnFlag2" = "tar created" ]] && [[ "$returnFlag1" = "tar moved" ]]; then
+       return 2; # tar not readable so moved; replaced
+    fi;
 } # checks if arg1 is tar; creates one otherwise
 #===END Declare local script functions===
 
 #====BEGIN sample code====
-myFile="/tmp/$(date +%s)..tar"
-yell "$myFile doesn't yet exist."
+#myFile="/tmp/$(date +%s)..tar"
+myFile="/tmp/$(date +%Y%m%d).tar"
+if [[ -f "$myFile" ]]; then yell "$myFile already exists."; else yell "$myFile doesn't yet exist."; fi
 if checkMakeTar "$myFile"; then
     yell "checkMakeTar() function run and exited:$?";
 else
@@ -53,3 +65,6 @@ else
     ls -l "$myFile";
 fi
 #====END sample code====
+
+# Author: Steven Baltakatei Sandoval
+# License: GPLv3+