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-rw-r--r--scripts/install-multi-user.sh10
-rw-r--r--scripts/install-nix-from-closure.sh5
2 files changed, 13 insertions, 2 deletions
diff --git a/scripts/install-multi-user.sh b/scripts/install-multi-user.sh
index 4b65783a20ff..c89e18b5116d 100644
--- a/scripts/install-multi-user.sh
+++ b/scripts/install-multi-user.sh
@@ -240,10 +240,16 @@ EOF
 }
 trap finish_fail EXIT
 
+channel_update_failed=0
 function finish_success {
     finish_cleanup
 
     ok "Alright! We're done!"
+    if [ "x$channel_update_failed" = x1 ]; then
+        echo ""
+        echo "But fetching the nixpkgs channel failed. (Are you offline?)"
+        echo "To try again later, run \"sudo -i nix-channel --update nixpkgs\"."
+    fi
     cat <<EOF
 
 Before Nix will work in your existing shells, you'll need to close
@@ -734,7 +740,9 @@ setup_default_profile() {
     # otherwise it will be lost in environments where sudo doesn't pass
     # all the environment variables by default.
     _sudo "to update the default channel in the default profile" \
-          HOME="$ROOT_HOME" NIX_SSL_CERT_FILE="$NIX_SSL_CERT_FILE" "$NIX_INSTALLED_NIX/bin/nix-channel" --update nixpkgs
+          HOME="$ROOT_HOME" NIX_SSL_CERT_FILE="$NIX_SSL_CERT_FILE" "$NIX_INSTALLED_NIX/bin/nix-channel" --update nixpkgs \
+          || channel_update_failed=1
+
 }
 
 
diff --git a/scripts/install-nix-from-closure.sh b/scripts/install-nix-from-closure.sh
index fc633fa2337e..7810a6461be3 100644
--- a/scripts/install-nix-from-closure.sh
+++ b/scripts/install-nix-from-closure.sh
@@ -132,7 +132,10 @@ if ! $nix/bin/nix-channel --list | grep -q "^nixpkgs "; then
     $nix/bin/nix-channel --add https://nixos.org/channels/nixpkgs-unstable
 fi
 if [ -z "$_NIX_INSTALLER_TEST" ]; then
-    $nix/bin/nix-channel --update nixpkgs
+    if ! $nix/bin/nix-channel --update nixpkgs; then
+        echo "Fetching the nixpkgs channel failed. (Are you offline?)"
+        echo "To try again later, run \"nix-channel --update nixpkgs\"."
+    fi
 fi
 
 added=