From: David van Moolenbroek <david@minix3.org>
Date: Fri, 2 Oct 2009 12:23:00 +0000 (+0000)
Subject: Add id(1) -g, -n, -r options (Bug#302, reported by Aleksey Cheusov)
X-Git-Tag: v3.1.5~37
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=e7dea9c6095321013f36eac1842d1d60d04a1cad;p=minix.git

Add id(1) -g, -n, -r options (Bug#302, reported by Aleksey Cheusov)
---

diff --git a/commands/simple/id.c b/commands/simple/id.c
index b2e6ae3fc..b1b044f97 100755
--- a/commands/simple/id.c
+++ b/commands/simple/id.c
@@ -18,8 +18,8 @@ int main(int argc, char *argv[])
 {
   struct passwd *pwd;
   struct group *grp;
-  uid_t ruid, euid;
-  gid_t rgid, egid;
+  uid_t ruid, euid, uid;
+  gid_t rgid, egid, gid;
 #if __minix_vmd
   uid_t suid;
   gid_t sgid;
@@ -36,7 +36,7 @@ int main(int argc, char *argv[])
 #endif
   int g;
   int isug;
-  int c, uopt = 0;
+  int c, uopt = 0, gopt = 0, nopt = 0, ropt = 0;
 
 #if __minix_vmd
   get6id(&ruid, &euid, &suid, &rgid, &egid, &sgid);
@@ -52,19 +52,50 @@ int main(int argc, char *argv[])
   ngroups = getgroups(NGROUPS_MAX, groups);
 #endif
 
-  while((c = getopt(argc, argv, "u")) != EOF) {
+  while((c = getopt(argc, argv, "ugnr")) != EOF) {
 	switch(c) {
 		case 'u':
 			uopt = 1;
 			break;
+		case 'g':
+			gopt = 1;
+			break;
+		case 'n':
+			nopt = 1;
+			break;
+		case 'r':
+			ropt = 1;
+			break;
 		default:
 			fprintf(stderr, "%s: unrecognized option\n", argv[0]);
 			return(1);
 	}
   }
 
+  if(uopt && gopt) {
+	fprintf(stderr, "%s: cannot combine -u and -g\n", argv[0]);
+	return 1;
+  }
+
+  if((nopt || ropt) && !uopt && !gopt) {
+	fprintf(stderr, "%s: cannot use -n or -r without -u or -g\n", argv[0]);
+	return 1;
+  }
+
   if(uopt) {
-	printf("%d\n", euid);
+	uid = ropt ? ruid : euid;
+	if (!nopt || (pwd = getpwuid(uid)) == NULL)
+		printf("%u\n", uid);
+	else
+		printf("%s\n", pwd->pw_name);
+	return 0;
+  }
+  if(gopt) {	
+	gid = ropt ? rgid : egid;
+	if (!nopt || (grp = getgrgid(gid)) == NULL)
+		printf("%u\n", gid);
+	else
+		printf("%s\n", grp->gr_name);
 	return 0;
   }
 
diff --git a/man/man1/id.1 b/man/man1/id.1
index ba3d6a311..4cfbd8184 100644
--- a/man/man1/id.1
+++ b/man/man1/id.1
@@ -3,6 +3,7 @@
 id \- print the uid and gid
 .SH SYNOPSIS
 \fBid\fR
+.RB [ \-ugnr ]
 .br
 .de FL
 .TP
@@ -22,7 +23,11 @@ id \- print the uid and gid
 If the effective uid and gid are different from the real ones, all of them
 are printed.
 .PP
-Under Minix-vmd the supplementary group IDs are also printed.
+If the \fB\-u\fP or \fB\-g\fP option is specified, then \fBid\fP will print
+the effective uid or guid number, respectively, on a single line. Combined
+with either of those options, the \fB\-n\fP option prints the name instead of
+the number, and the \fB\-r\fP option prints the real instead of the effective
+uid or gid.
 .SH "SEE ALSO"
 .BR getuid (2),
 .BR getgid (2),