refactor(hm/pkgs): Implement with an nixpkgs overlay

1 files changed, 77 insertions, 0 deletions

diff --git a/sys/nixpkgs/pkgs/scripts/source/small_functions/update-sys.sh b/sys/nixpkgs/pkgs/scripts/source/small_functions/update-sys.sh
new file mode 100755
index 00000000..68fb342d
--- /dev/null
+++ b/sys/nixpkgs/pkgs/scripts/source/small_functions/update-sys.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env dash
+
+# shellcheck source=/dev/null
+SHELL_LIBRARY_VERSION="2.0.13" . %SHELL_LIBRARY_PATH
+
+help() {
+    cat <<EOF
+This is a NixOS System flake update manager.
+
+Usage:
+    $NAME [--branch <branchname>] [--help]
+
+Options:
+    --branch | -b  BRANCHNAME
+                                select a branch to update from.
+    --mode | -m  MODE
+                                select a mode to update with
+    --help   | -h
+                                output this help.
+EOF
+    exit "$1"
+}
+default_branch=$(mktmp)
+BRANCH=""
+
+while [ "$#" -gt 0 ]; do
+    case "$1" in
+    "--help" | "-h")
+        help 0
+        ;;
+    "--branch" | "-b")
+        if [ -n "$2" ]; then
+            BRANCH="$2"
+        else
+            error "$1 requires an argument"
+            help 1
+        fi
+        shift 2
+        ;;
+    "--mode" | "-m")
+        if [ -n "$2" ]; then
+            MODE="$2"
+        else
+            error "$1 requires an argument"
+            help 1
+        fi
+        shift 2
+        ;;
+    *)
+        error "the option $1 does not exist!"
+        help 1
+        ;;
+    esac
+done
+
+cd /etc/nixos || die "No /etc/nixos"
+msg "Starting system update..."
+git remote update origin --prune >/dev/null 2>&1
+if ! [ "$BRANCH" = "" ]; then
+    git switch "$BRANCH" >/dev/null 2>&1 && msg2 "Switched to branch '$BRANCH'"
+fi
+msg2 "Updating git repository..."
+git pull --rebase
+
+git remote show origin | grep 'HEAD' | cut -d':' -f2 | sed -e 's/^ *//g' -e 's/ *$//g' >"$default_branch" &
+
+msg2 "Updating system..."
+if [ -n "$MODE" ]; then
+    nixos-rebuild "$MODE"
+else
+    nixos-rebuild switch
+fi
+
+git switch "$(cat "$default_branch")" >/dev/null 2>&1 && msg2 "Switched to branch '$(cat "$default_branch")'"
+msg "Finished Update!"
+
+# vim: ft=sh