Add script for checking out a generation

1 files changed, 45 insertions, 0 deletions

diff --git a/nix-script-channel-checkout-generation.sh b/nix-script-channel-checkout-generation.sh
new file mode 100755
index 0000000..044e2d0
--- /dev/null
+++ b/nix-script-channel-checkout-generation.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+source $(dirname ${BASH_SOURCE[0]})/nix-utils.sh
+
+usage() {
+    cat <<EOS
+    $(help_synopsis "${BASH_SOURCE[0]}" "[-h] [-g <n>]")
+
+        -g <n>  Generation to checkout
+        -h      Show this help and exit
+
+$(help_end)
+EOS
+}
+
+# no generation by now
+GEN=
+
+while getopts "hg:" OPTION
+do
+    case $OPTION in
+        g)
+            GEN=$OPTARG
+            stdout "GEN = $GEN"
+            ;;
+        h)
+            usage
+            exit 0
+            ;;
+
+        *)
+            ;;
+    esac
+done
+
+[[ -z "$GEN" ]] && stderr "No generation number passed" && exit 1
+
+CHANNELS=/nix/var/nix/profiles/per-user/root/channels
+
+stdout "Executing checkout. Password cache will be reset afterwards"
+explain sudo nix-env -p $CHANNELS --switch-generation $GEN
+
+stdout "Resetting sudo password"
+sudo -k
+