Use local isos (#314)

* Start adding params for existing isos

* Merge parameter handling code

* initial testing seems reasonable

Note that if copying files in, "wget -c " will assume

smaller-than-remote files are parts and continue
so likely will cause hashing failures
or if no hash check then corrupt isos.

* Added usage for --help

* Usage enhanced and added to Readme

* spurios unused cruft removed

README.md

@@ -226,6 +226,16 @@ disk_img="debian-bullseye/disk.qcow2"
 iso="debian-bullseye/firmware-11.0.0-amd64-DVD-1.iso"
 ```
 
+If you already have a collection of ISOs downloaded you can have `quickget` find and copy your existing file into the VM directory.
+
+~~~~
+--isodir                : base path beneath which to find local ISO copy
+                                       if a matching file is found it will be copied to the VM directory
+--localiso              : optional local ISO filename - defaults to target filename
+~~~~
+
+`quickget` will then continue to `wget` or `zsync` using that file as a prior copy.  If the target file exists in the VM directory `quickget` will raise an error if you run it with `--isodir`
+
   * Use `quickemu` to start the virtual machine:
 
 ```bash

quickget

@@ -536,9 +536,30 @@ function check_hash() {
     fi
 }
 
+function copy_local(){
+  if [ -n "${ISODIR}" ]; then
+    # use supplied filename or default to original distro ISO name
+      if [ -z ${LOCALISO} ]; then
+        LOCALISO=${FILE}
+      fi
+      LOCALFILE=$(find ${ISODIR} -type f -name "${LOCALISO}" -print -quit )
+      #echo got local file "${LOCALFILE}"
+      if [ -f "${DIR}/${FILE}" ]; then
+        echo "ERROR! File Exists - not copying over local file"
+        echo "Move it out of the way to replace it with a local file"
+        exit 1
+      else
+        cp -pv "${LOCALFILE}" ${DIR}/${FILE}
+      # if ! ; then echo ERROR! Failed to copy ${LOCALFILE}" to ${DIR}/${FILE}"
+      fi
+      #exit 0 # while testing
+    fi
+}
+
 function web_get() {
     local DIR="${2}"
     local FILE=""
+    local LOCALFILE=""
     local URL="${1}"
 
     if [ -n "${3}" ]; then
@@ -551,6 +572,7 @@ function web_get() {
       echo "ERROR! Unable to create directory ${DIR}"
       exit 1
     fi
+    copy_local
 
     if command -v aria2c > /dev/null; then
         if ! aria2c -x16 --continue=true --summary-interval=0 --download-result=hide --console-log-level=error "${URL}" -o "${DIR}/${FILE}"; then
@@ -565,11 +587,13 @@ function web_get() {
           exit 1
         fi
     fi
+
 }
 
 function zsync_get() {
     local DIR="${2}"
     local FILE=""
+    local LOCALFILE=""
     local OUT=""
     local URL="${1}"
     FILE="${URL##*/}"
@@ -589,6 +613,8 @@ function zsync_get() {
         exit 1
       fi
 
+    copy_local
+
       if ! zsync "${URL}.zsync" -i "${DIR}/${OUT}" -o "${DIR}/${OUT}" 2>/dev/null; then
           echo "ERROR! Failed to download ${URL}.zsync"
           exit 1
@@ -1888,7 +1914,25 @@ function get_windows() {
     esac
     make_vm_config "${FILE_NAME}" "virtio-win.iso"
 }
-
+function usage() {
+  echo
+  echo "Usage"
+  echo "  $0 [--isodir] [--localiso] [--list | --json] <OS> <Release> (<Option>)"
+  echo
+  echo If you omit parameters a list of supported OS options will be provided.
+  echo If you omit a Release a list of supported releases for the selected OS will be  given.
+  echo
+  echo "You can also pass optional parameters"
+  echo
+  echo "  --list                  : print a csv list of supported guest"
+  echo "  --json                  : print a json list of supported guest"
+  echo "  --isodir                : base path beneath which to find local ISO copy
+                                       if a matching file is found it will be copied to the VM directory"
+  echo "  --localiso              : local ISO filename - defaults to target filename"
+  echo "  --help                  : Print usage (this)"
+  echo "  --version               : Print version"
+  exit 1
+}
 trap cleanup EXIT
 
 if ((BASH_VERSINFO[0] < 4))
@@ -1900,18 +1944,44 @@ fi
 LANGS=()
 languages_windows
 
-if [ -n "${1}" ]; then
-    OS="${1,,}"
-    if [ "${OS}" == "list" ] || [ "${OS}" == "list_csv" ]; then
-        list_csv
-    elif [ "${OS}" == "list_json" ]; then
-        list_json
-    elif [ "${OS}" == "--version" ] || [ "${OS}" == "-version" ] || [ "${OS}" == "version" ]; then
+# handle parameters
+
+# Take command line arguments
+#if [ $# -lt 1 ]; then
+#    usage
+#    exit 0
+#else
+    while [ $# -gt 0 ]; do
+        case "${1}" in
+          -isodir|--isodir)
+            ISODIR="${2}"
+            shift
+            shift;;
+          -localiso|--localiso)
+            LOCALISO="${2}"
+            shift
+            shift;;
+         -h|--h|-help|--help)
+            usage
+            exit 0;;
+         -l|--l|-list|--list|list|list_csv)
+            list_csv;;
+          -j|--j|-json|--json|list_json)
+            list_json;;
+          -v|--v|-version|--version|version )
              whereIam=$(dirname "${BASH_SOURCE[0]}")
               quickemu_version=$( "${whereIam}"/quickemu --version)
               echo "Quickemu Version: ${quickemu_version}"
-      exit 0
-    fi
+              exit 0;;
+          test*)
+             echo "you are just testing
+             ISODIR:  ${ISODIR}
+             LOCALISO: ${LOCALISO}"
+             exit 0;;
+          *)
+
+if [ -n "${1}" ]; then
+    OS="${1,,}"
 else
     echo "ERROR! You must specify an operating system:"
     os_support
@@ -2133,3 +2203,11 @@ else
     fi
     exit 1
 fi
+;;
+   esac
+    done
+    if [ $# == 0 ]; then
+      echo "Error: You must supply an OS!"
+      os_support
+      exit 1
+fi