fix(easyos): move to dynamic release behaviour (#1494)

The static list included a release that has been removed
and also  hard coded mappings for 2023 and 2024. This dynamically determines the latest two years
and finds available releases in those years, so will still provide reasonable service next year.

quickget

@@ -679,16 +679,17 @@ function releases_dragonflybsd() {
 }
 
 function releases_easyos() {
-    #local Y2023=""
-    #local Y2024=""
-    #Y2024=$(web_pipe https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/2024/ | grep "tr class" | tail -n +2 | cut -d'"' -f6 | cut -d'/' -f1 | sort -r)
-    #Y2023=$(web_pipe https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/2023/ | grep "tr class" | tail -n +2 | cut -d'"' -f6 | cut -d'/' -f1 | sort -r)
-    #echo -n ${2024}
-    #echo ${Y2023}
-    # Not dynamic for now
-    echo 5.7 5.6.7 5.6.6 5.6.5 5.6.4 5.6.3 5.6.2 5.6.1
+    local ALL_RELEASES=""
+    local YEAR=""
+    # get the latest 2 years of releases so that when we hit next year we still have the latest 2 years
+    TWO_YEARS=$(web_pipe https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/ | grep -o -E '[[:digit:]]{4}/' | sort -nr | tr -d /  | head -n 2 )
+    for YEAR in ${TWO_YEARS} ; do
+        ALL_RELEASES="${ALL_RELEASES} $(web_pipe https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/${YEAR}/ | grep -o -E '[[:digit:]]+(\.[[:digit:]])+/' | tr -d / | sort -nr)"
+    done
+    echo ${ALL_RELEASES}
 }
 
+
 function releases_elementary() {
     echo 8.0 7.1 7.0
 }
@@ -1766,12 +1767,14 @@ function get_easyos() {
     local ISO=""
     local YEAR=""
     ISO="easy-${RELEASE}-amd64.img"
-    case ${RELEASE} in
-        5.6.5|5.6.4|5.6.3|5.6.2|5.6.1) YEAR="2023";;
-        5.7|5.6.7|5.6.6)               YEAR="2024";;
-    esac
-    URL="https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/${YEAR}/${RELEASE}"
-    HASH=$(web_pipe "${URL}/md5.sum.txt" | cut -d' ' -f1)
+    TWO_YEARS=$(web_pipe https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/ | grep -o -E '[[:digit:]]{4}/' | sort -nr | tr -d /  | head -n 2 )
+    for YEAR in ${TWO_YEARS} ; do
+        if web_check "https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/${YEAR}/${RELEASE}/" ; then
+            URL="https://distro.ibiblio.org/easyos/amd64/releases/kirkstone/${YEAR}/${RELEASE}"
+            HASH=$(web_pipe "${URL}/md5.sum.txt" | cut -d' ' -f1)
+            break
+        fi
+    done
     echo "${URL}/${ISO} ${HASH}"
 }