update_mirror.sh: Improve sanity check for repositories arguments

This prevents accidental copies of packages to wrong repositories.

Signed-off-by: Diego Giovane Pasqualin <dpasqualin@c3sl.ufpr.br>

bin/update_mirror.sh

@@ -30,6 +30,11 @@ PUBLISHSCRIPT="$(dirname $0)/le_publish.sh"
 PROJECT="le"
 HOST="http://windu.c3sl.ufpr.br/$PROJECT"
 
+# This is the "order" of the repositories, it means that usually the
+# developer will upgrade a package from unstable to testing, after that from
+# testing to rc, and so on.
+REPO_ORDER=( unstable testing rc stable )
+
 function clean() {
     rm -rf $TMPDIR
     exit 0
@@ -137,6 +142,30 @@ fi
 FROMREPO=$1
 TOREPO=$2
 
+# Check repository order and validity
+if ! (grep -qw $FROMREPO <<< ${REPO_ORDER[@]} &&
+      grep -qw $TOREPO <<< ${REPO_ORDER[@]}); then
+    echo -n "Repositories must be one of the following: "
+    echo ${REPO_ORDER[@]}
+    exit 1
+fi
+
+for ((i=0; i<${#REPO_ORDER[@]}; i++)); do
+    if [ ${REPO_ORDER[$i]} = $FROMREPO ]; then
+        next=${REPO_ORDER[(($i+1))]}
+        if [ $next != $TOREPO ]; then
+            echo -n "You are trying to copy a package from $FROMREPO to"
+            echo    " $TOREPO. Usually you'd copy it to $next first."
+            read -p "Are you sure you wanna do this (y/N)? " yn
+            if [ "$yn" != "y" ]; then
+                exit 0
+            fi
+        fi
+        break
+    fi
+done
+
+# Check whether diff argument was given
 DIFF=false
 if test "$3" = "--diff"; then
     DIFF=true