105 lines
3.2 KiB
Nix
105 lines
3.2 KiB
Nix
{
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pkgs ? import <nixpkgs> { },
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}:
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pkgs.writeShellScriptBin "hm" ''
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set -e
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HM="${pkgs.lib.getExe pkgs.home-manager}"
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FLAKE_PATH="''${HM_PATH:-$HOME/.config/home-manager}"
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FLAKE_OUTPUT="''${HM_USER:-$(whoami)@$(hostname)}"
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show_usage() {
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cat <<EOF
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Usage: hm <command> [args]
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Commands:
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apply Switch to a new generation
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generation list List all generations
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generation delete ID... Delete specified generation(s)
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generation rollback Rollback to the previous generation
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generation switch ID Switch to the specified generation
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generation cleanup Delete all but the current generation
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Environment Variables:
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HM_PATH Override default flake path (~/.config/home-manager)
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Currently set to "''${HM_PATH:-<not set>}"
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HM_USER Override default user output ("$(whoami)@$(hostname)")
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Currently set to "''${HM_USER:-<not set>}"
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EOF
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}
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if [[ $# -eq 0 ]]; then
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show_usage
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exit 1
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fi
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case "$1" in
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apply)
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"$HM" switch --flake "$FLAKE_PATH#$FLAKE_OUTPUT"
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;;
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generation)
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if [[ $# -lt 2 ]]; then
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echo "Error: generation command requires a subcommand"
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show_usage
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exit 1
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fi
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case "$2" in
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list)
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"$HM" generations
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;;
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delete)
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if [[ $# -lt 3 ]]; then
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echo "Error: delete requires at least one generation ID"
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exit 1
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fi
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shift 2
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"$HM" remove-generations "$@"
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;;
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rollback)
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PREV_GEN=$("$HM" generations | \
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sed -n 's/^[[:space:]]*id \([0-9]\+\).*/\1/p' | \
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head -n 2 | tail -n 1)
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if [[ -z "$PREV_GEN" ]]; then
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echo "Error: could not determine previous generation (possibly only one generation exists)"
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exit 1
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fi
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"$HM" switch --flake "$FLAKE_PATH" --switch-generation "$PREV_GEN"
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;;
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switch)
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if [[ $# -ne 3 ]]; then
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echo "Error: switch requires exactly one generation ID"
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exit 1
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fi
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"$HM" switch --flake "$FLAKE_PATH" --switch-generation "$3"
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;;
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cleanup)
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CURRENT_GEN=$("$HM" generations | sed -n 's/^.*id \([0-9]\+\) .* (current)$/\1/p')
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if [[ -z "$CURRENT_GEN" ]]; then
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echo "Error: could not determine current generation"
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exit 1
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fi
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OLD_GENS=$("$HM" generations | sed -n 's/^.*id \([0-9]\+\) .*/\1/p' | grep -v "^$CURRENT_GEN$")
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if [[ -z "$OLD_GENS" ]]; then
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echo "No old generations to delete"
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else
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echo "Deleting generations: $(echo $OLD_GENS | tr '\n' ' ')"
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echo "$OLD_GENS" | xargs "$HM" remove-generations
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echo "Cleanup complete. Current generation $CURRENT_GEN preserved."
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fi
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;;
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*)
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echo "Error: unknown generation subcommand '$2'"
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show_usage
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exit 1
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;;
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esac
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;;
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*)
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echo "Error: unknown command '$1'"
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show_usage
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exit 1
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;;
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esac
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''
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