libs: made error message clearer and more consistent

lib/aaa_errors.sh

@@ -134,7 +134,7 @@ check_root()
         return 0
     fi
     if [[ $EUID -ne 0 ]]; then
-        prnt E "That script must be run with root privileges."
+        prnt E "check_root: That script must be run with root privileges."
         die 4 --force
     fi
 }

lib/filefct.sh

@@ -177,7 +177,7 @@ patchfile()
     local workfile=${dstfile}.work
 
     if [[ ! -s $srcfile ]]; then
-        prnt E "The source file is empty, is not a file or don't exists!"
+        prnt E "patchfile(): Source file is empty, is not a file or don't exists!"
         die 10
     fi
 
@@ -218,7 +218,7 @@ file_exists()
     prnt I "Checking $@ files existance..."
     for f in $@; do
         if [[ ! -f $(select_file $f) ]]; then
-            prnt E "The $f file is missing, cannot continue."
+            prnt E "file_exists(): The $f file is missing, can't continue."
             die 10
        fi
     done

lib/services.sh

@@ -15,7 +15,7 @@
 exec_serv()
 {
     if [[ $# -lt 2 ]]; then
-        prnt E "exec_serv(): Syntax error!"
+        prnt E "exec_serv(): Syntax error (parameters: $@)!"
         exit 11
     fi
 

lib/utils.sh

@@ -21,6 +21,11 @@ export -f stdtime
 # ------------------------------------------------------------------------------
 # Check if a function exists, return 0 if so
 function_exists() {
+    if [[ $# -ne 1 ]]; then
+        prnt E "function_exists(): A function name is required!"
+        die 11 --force
+    fi
+
     LC_ALL=C type -t $1 | grep function
     return $?
 }

lib/version.sh

@@ -13,7 +13,7 @@
 get_os_version()
 {
     if [[ ! -f /etc/os-release ]]; then
-        prnt E "Your distribution doesn't have the needed os-release file."
+        prnt E "get_os_version(): Your distribution doesn't have the needed os-release file."
         die 8 --force
     fi
 
@@ -26,7 +26,7 @@ get_os_version()
         source /etc/os-release
 
         if [[ -z $ID ]]; then
-            prnt E "Your /etc/os-release file mises some vital information."
+            prnt E "get_os_version(): Your /etc/os-release file mises some vital information."
             die --force 8
         fi
 
@@ -50,7 +50,7 @@ export read_os_release
 set_sys_vars()
 {
     if [[ $# -ne 4 ]]; then
-        prnt E "get_os_version(): incorect number of parameters ($@)."
+        prnt E "set_sys_vars(): Incorrect number of parameters ($@)."
         die --force 7
     fi
 

lib/zzz_main_fct.sh

@@ -16,7 +16,7 @@ read_commandline()
 {
     syntax_error()
     {
-        prnt E "Error while analysing command line, please check your parameters."
+        prnt E "Error while analysing command line parameters."
         die 1 --force
     }
 
@@ -52,9 +52,9 @@ read_commandline()
                 if [[ -s $STAGE_FILE ]]; then
                     export RESUME=true
                 else
-                    prnt E "The state file doesn't exists or is empty!"
+                    prnt E "The status file doesn't exists or is empty!"
                     prnt E "Without it, resuming is impossible."
-                    die 1 --force
+                    die 17 --force
                 fi
                 ;;
             "-R"|"--no-root-check")
@@ -102,7 +102,7 @@ read_commandline()
                         export NEW_LOGFILE=$opt
                         want_logfile=false
                     else
-                        prnt E "It's impossible to specify several log files."
+                        prnt E "Impossible to specify several log files."
                         die 1 --force
                     fi
                 elif [[ $want_conffile == true ]]; then