linux-kernel - [RFC PATCH v1 1/1] bpftool: Add generating command to C dumped file.

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Date:   Tue, 12 Jul 2022 20:42:25 +0200
From:   Francis Laniel <flaniel@...ux.microsoft.com>
To:     bpf@...r.kernel.org
Cc:     Francis Laniel <flaniel@...ux.microsoft.com>,
        Quentin Monnet <quentin@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC PATCH v1 1/1] bpftool: Add generating command to C dumped file.

This commit adds the following lines to file generated by dump:
/*
 * File generated by bpftool using:
 * bpftool btf dump file /sys/kernel/btf/vmlinux format c
 * DO NOT EDIT.
 */
This warns users to not edit the file and documents the command used to
generate the file.

Signed-off-by: Francis Laniel <flaniel@...ux.microsoft.com>
---
 tools/bpf/bpftool/btf.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 7e6accb9d9f7..eecfc27370c3 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -415,7 +415,8 @@ static void __printf(2, 0) btf_dump_printf(void *ctx,
 }
 
 static int dump_btf_c(const struct btf *btf,
-		      __u32 *root_type_ids, int root_type_cnt)
+		      __u32 *root_type_ids, int root_type_cnt,
+		      int argc, char **argv)
 {
 	struct btf_dump *d;
 	int err = 0, i;
@@ -425,6 +426,14 @@ static int dump_btf_c(const struct btf *btf,
 	if (err)
 		return err;
 
+	printf("/*\n");
+	printf(" * File generated by bpftool using:\n");
+	printf(" * bpftool btf dump");
+	for (i = 0; i < argc; i++)
+		printf(" %s", argv[i]);
+	printf("\n");
+	printf(" * DO NOT EDIT.\n");
+	printf(" */\n");
 	printf("#ifndef __VMLINUX_H__\n");
 	printf("#define __VMLINUX_H__\n");
 	printf("\n");
@@ -507,8 +516,10 @@ static bool btf_is_kernel_module(__u32 btf_id)
 static int do_dump(int argc, char **argv)
 {
 	struct btf *btf = NULL, *base = NULL;
+	char **orig_argv = argv;
 	__u32 root_type_ids[2];
 	int root_type_cnt = 0;
+	int orig_argc = argc;
 	bool dump_c = false;
 	__u32 btf_id = -1;
 	const char *src;
@@ -649,7 +660,8 @@ static int do_dump(int argc, char **argv)
 			err = -ENOTSUP;
 			goto done;
 		}
-		err = dump_btf_c(btf, root_type_ids, root_type_cnt);
+		err = dump_btf_c(btf, root_type_ids, root_type_cnt,
+				 orig_argc, orig_argv);
 	} else {
 		err = dump_btf_raw(btf, root_type_ids, root_type_cnt);
 	}
-- 
2.25.1