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Expose the kernel's build-ID through uname -b

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After r348611 the kernel's build-ID is available via sysctl.  Add a -b flag
to uname to report it.

Submitted by:	Ali Mashtizadeh <ali_mashtizadeh.com>
Reviewed by:	markj, imp
Relnotes:	Yes
Event:		Waterloo Hackathon 2019
Differential Revision:	https://reviews.freebsd.org/D20511
This commit is contained in:
Ed Maste 2019-06-27 20:34:50 +00:00
parent 7f63b888c7
commit fb9a985516
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349469
2 changed files with 23 additions and 6 deletions
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10
usr.bin/uname/uname.1
View File

@ -28,7 +28,7 @@
.\" @(#)uname.1 8.3 (Berkeley) 4/8/94
.\" $FreeBSD$
.\"
.Dd May 31, 2017
.Dd June 27, 2019
.Dt UNAME 1
.Os
.Sh NAME
@ -36,7 +36,7 @@
.Nd display information about the system
.Sh SYNOPSIS
.Nm
.Op Fl aiKmnoprsUv
.Op Fl abiKmnoprsUv
.Sh DESCRIPTION
The
.Nm
@ -53,6 +53,8 @@ Behave as though the options
and
.Fl v
were specified.
.It Fl b
Write the kernel's linker-generated build-id to standard output.
.It Fl i
Write the kernel ident to standard output.
.It Fl K
@ -152,3 +154,7 @@ and
.Fl U
extension flags appeared in
.Fx 10.0 .
The
.Fl b
extension flag appeared in
.Fx 13.0 .

19
usr.bin/uname/uname.c
View File

@ -67,9 +67,10 @@ static const char sccsid[] = "@(#)uname.c 8.2 (Berkeley) 5/4/95";
#define IFLAG 0x40
#define UFLAG 0x80
#define KFLAG 0x100
#define BFLAG 0x200
typedef void (*get_t)(void);
static get_t get_ident, get_platform, get_hostname, get_arch,
static get_t get_buildid, get_ident, get_platform, get_hostname, get_arch,
get_release, get_sysname, get_kernvers, get_uservers, get_version;
static void native_ident(void);
@ -81,11 +82,13 @@ static void native_sysname(void);
static void native_version(void);
static void native_kernvers(void);
static void native_uservers(void);
static void native_buildid(void);
static void print_uname(u_int);
static void setup_get(void);
static void usage(void);
static char *ident, *platform, *hostname, *arch, *release, *sysname, *version, *kernvers, *uservers;
static char *buildid, *ident, *platform, *hostname, *arch, *release, *sysname,
*version, *kernvers, *uservers;
static int space;
int
@ -97,11 +100,14 @@ main(int argc, char *argv[])
setup_get();
flags = 0;
while ((ch = getopt(argc, argv, "aiKmnoprsUv")) != -1)
while ((ch = getopt(argc, argv, "abiKmnoprsUv")) != -1)
switch(ch) {
case 'a':
flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
break;
case 'b':
flags |= BFLAG;
break;
case 'i':
flags |= IFLAG;
break;
@ -169,6 +175,7 @@ setup_get(void)
CHECK_ENV("i", ident);
CHECK_ENV("K", kernvers);
CHECK_ENV("U", uservers);
CHECK_ENV("b", buildid);
}
#define PRINT_FLAG(flags,flag,var) \
@ -194,6 +201,7 @@ print_uname(u_int flags)
PRINT_FLAG(flags, IFLAG, ident);
PRINT_FLAG(flags, KFLAG, kernvers);
PRINT_FLAG(flags, UFLAG, uservers);
PRINT_FLAG(flags, BFLAG, buildid);
printf("\n");
}
@ -261,6 +269,9 @@ NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
} NATIVE_SET;
NATIVE_SYSCTLNAME_GET(buildid, "kern.build_id") {
} NATIVE_SET;
static void
native_uservers(void)
{
@ -282,6 +293,6 @@ native_kernvers(void)
static void
usage(void)
{
fprintf(stderr, "usage: uname [-aiKmnoprsUv]\n");
fprintf(stderr, "usage: uname [-abiKmnoprsUv]\n");
exit(1);
}