sagemathgh-37995: Remove interactive confirmation for installing expe…

…rimental packages

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This removes some complexity and eliminates the pitfall that Sage is
waiting for confirmation from the user but the query is hidden in long
terminal output from other package installations.
With this PR we just exit with an error and tell users what to do.

Fixes sagemath#35670.

### 📝 Checklist

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- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

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URL: sagemath#37995
Reported by: Matthias Köppe
Reviewer(s):

build/bin/sage-spkg

@@ -363,32 +363,10 @@ WRAPPED_SCRIPTS="build install preinst pipinst postinst $INSTALLED_SCRIPTS"
 warning_for_experimental_packages() { ############################
 if [ x`cat "$PKG_SCRIPTS/type"` = x"experimental" ]; then
     if [ $YES != 1 -a -n "$PKG_NAME_UPSTREAM" ]; then
-        # We use /dev/tty here because our output may be redirected
-        # to a logfile, or line-buffered.
-        write_to_tty <<EOF
-=========================== WARNING ===========================
-You are about to download and install the experimental package
-$PKG_NAME.  This probably won't work at all for you! There
-is no guarantee that it will build correctly, or behave as
-expected. Use at your own risk!
-===============================================================
-EOF
-        if [ $? -ne 0 ]; then
-            echo "Terminal not available for prompting.  Use 'sage -i -y $PKG_BASE'"
-            echo "to install experimental packages in non-interactive mode."
-            YES=-1
-        fi
-        if [ $YES != -1 ]; then
-            read -p "Are you sure you want to continue [Y/n]? " answer < /dev/tty > /dev/tty 2>&1
-        else
-            answer=n
-        fi
-        case "$answer" in
-            n*|N*) exit 1;;
-        esac
-        # Confirm the user's input.  (This gives important
-        # feedback to the user when output is redirected to a logfile.)
-        echo > /dev/tty "OK, installing $PKG_NAME now..."
+        echo "Error: The package $PKG_NAME is marked as experimental."
+        echo "Use 'sage -i -y $PKG_BASE' to force installation of this package"
+        echo "or use the configure option --enable-experimental-packages"
+        exit 1
     fi
 fi
 } ############################## warning_for_experimental_packages

build/pkgs/configure/checksums.ini

@@ -1,3 +1,3 @@
 tarball=configure-VERSION.tar.gz
-sha1=dca19f73642b76f1f96b860bb6603499f586380d
-sha256=843e060687a9a2360ea3e9499e5c20eb744fcfc2acd4b13c01444ecd961fd43e
+sha1=f593a1829c212d3ca288997f1b9a628c031cdf6e
+sha256=f112fc41dfa549b0eff89223f20cf6b97e4196aff23775fea1f7a9705b44604a

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-f5e78840b108412e1e26382910af993f874c6933
+f42c9f7bce761282a09103dea32de38da9bf6e46