[PATCH] util-linux: add minimal uuidgen implementation

[Osama Abdelkader]

On Sun, Nov 23, 2025 at 03:19:58AM +0200, Osama Abdelkader wrote:
> Add a simple uuidgen utility that generates RFC 4122 compliant
> UUIDs (version 4, random). Uses the existing generate_uuid()
> function from libbb.
> 
> Features:
> - Generates standard format UUIDs: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
> - RFC 4122 version 4 compliant
> - Minimal implementation (~1.1 kb)
> - NOFORK applet for efficiency
> 
> Signed-off-by: Osama Abdelkader <osama.abdelkader at gmail.com>
> ---
>  util-linux/uuidgen.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 util-linux/uuidgen.c
> 
> diff --git a/util-linux/uuidgen.c b/util-linux/uuidgen.c
> new file mode 100644
> index 000000000..6c5fb6903
> --- /dev/null
> +++ b/util-linux/uuidgen.c
> @@ -0,0 +1,47 @@
> +/* vi: set sw=4 ts=4: */
> +/*
> + * Mini uuidgen implementation for busybox
> + *
> + * Licensed under GPLv2 or later, see file LICENSE in this source tree.
> + */
> +//config:config UUIDGEN
> +//config:	bool "uuidgen (1.1 kb)"
> +//config:	default y
> +//config:	help
> +//config:	Generate a UUID (Universally Unique Identifier) in RFC 4122 format.
> +
> +//applet:IF_UUIDGEN(APPLET_NOFORK(uuidgen, uuidgen, BB_DIR_USR_BIN, BB_SUID_DROP, uuidgen))
> +
> +//kbuild:lib-$(CONFIG_UUIDGEN) += uuidgen.o
> +
> +//usage:#define uuidgen_trivial_usage
> +//usage:       ""
> +//usage:#define uuidgen_full_usage "\n\n"
> +//usage:       "Generate a UUID (Universally Unique Identifier)"
> +
> +#include "libbb.h"
> +
> +/* This is a NOFORK applet. Be very careful! */
> +
> +int uuidgen_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
> +int uuidgen_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
> +{
> +	uint8_t uuid[16];
> +	
> +	if (argv[1]) {
> +		bb_show_usage();
> +	}
> +
> +	generate_uuid(uuid);
> +	
> +	/* Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx */
> +	printf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n",
> +		uuid[0], uuid[1], uuid[2], uuid[3],
> +		uuid[4], uuid[5],
> +		uuid[6], uuid[7],
> +		uuid[8], uuid[9],
> +		uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
> +
> +	return fflush_all();
> +}
> +
> -- 
> 2.43.0
> 
ping.