nixos-rebuild: add -F convenience flag for --flake (#464073)

pkgs/by-name/ni/nixos-rebuild-ng/nixos-rebuild.8.scd

@@ -279,7 +279,7 @@ It must be one of the following:
 	attribute path from file specified by the *--file* option. If specified
 	without *--file* option, uses _default.nix_ in current directory.
 
-*--flake* _flake-uri[#name]_
+*--flake* _flake-uri[#name]_, *-F* _flake-uri[#name]_
 	Build the NixOS system from the specified flake. It defaults to the
 	directory containing the target of the symlink _/etc/nixos/flake.nix_,
 	if it exists. The flake must contain an output named

pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/__init__.py

@@ -100,6 +100,7 @@ def get_parser() -> tuple[argparse.ArgumentParser, dict[str, argparse.ArgumentPa
     )
     main_parser.add_argument(
         "--flake",
+        "-F",
         nargs="?",
         const=True,
         help="Build the NixOS system from the specified flake",

pkgs/os-specific/linux/nixos-rebuild/_nixos-rebuild

@@ -51,7 +51,7 @@ _nixos-rebuild() {
 
     # flakes options
     --commit-lock-file
-    --flake # flake-uri
+    --flake -F # flake-uri
     --override-input # input-name flake-uri
     --recreate-lock-file
     --update-input

pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.8

@@ -21,7 +21,7 @@
 .br
 .Op Fl -file | f Ar path
 .Op Fl -attr | A Ar attrPath
-.Op Fl -flake Ar flake-uri
+.Op Fl -flake | F Ar flake-uri
 .Op Fl -no-flake
 .Op Fl -recreate-lock-file
 .Op Fl -no-update-lock-file

pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh

@@ -176,7 +176,7 @@ while [ "$#" -gt 0 ]; do
       --no-ssh-tty)
         noSSHTTY=1
         ;;
-      --flake)
+      --flake|-F)
         flake="$1"
         shift 1
         ;;