--- /dev/null
+// $Id: vuname.c,v 1.7 2005/03/24 12:44:17 ensc Exp $ --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "vserver.h"
+#include "util.h"
+
+#include <getopt.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <libgen.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <strings.h>
+
+#define ENSC_WRAPPERS_PREFIX "vuname: "
+#define ENSC_WRAPPERS_UNISTD 1
+#define ENSC_WRAPPERS_IO 1
+#define ENSC_WRAPPERS_VSERVER 1
+#include <wrappers.h>
+
+#define CMD_HELP 0x1000
+#define CMD_VERSION 0x1001
+#define CMD_DIR 0x4007
+#define CMD_MISSINGOK 0x4008
+
+int wrapper_exit_code = 255;
+
+static vc_uts_type const UTS_MAPPING[7] = {
+ vcVHI_CONTEXT, vcVHI_SYSNAME, vcVHI_NODENAME,
+ vcVHI_RELEASE, vcVHI_VERSION, vcVHI_MACHINE,
+ vcVHI_DOMAINNAME };
+
+#define DECL(UTS) [vcVHI_ ## UTS] = #UTS
+static char const * const UTS_STRINGS[] = {
+ DECL(CONTEXT), DECL(SYSNAME), DECL(NODENAME),
+ DECL(RELEASE), DECL(VERSION), DECL(MACHINE),
+ DECL(DOMAINNAME)
+};
+
+struct Tag {
+ bool is_set;
+ char const * value;
+};
+
+struct Arguments {
+ struct Tag tags[DIM_OF(UTS_MAPPING)];
+ xid_t xid;
+ bool do_set;
+ char const * dir;
+ bool is_missingok;
+};
+
+static struct option const
+CMDLINE_OPTIONS[] = {
+ { "help", no_argument, 0, CMD_HELP },
+ { "version", no_argument, 0, CMD_VERSION },
+ { "xid", required_argument, 0, 'x' },
+ { "set", no_argument, 0, 's' },
+ { "get", no_argument, 0, 'g' },
+ { "dir", required_argument, 0, CMD_DIR },
+ { "missingok", no_argument, 0, CMD_MISSINGOK },
+ { 0,0,0,0 }
+};
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+ VSERVER_DECLARE_CMD(cmd);
+
+ WRITE_MSG(fd, "Usage: ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " [-g] --xid <xid> <TAG>*\n"
+ " or ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " -s --xid <xid> -t <TAG>=<VALUE> [--] [<command> <args>*]\n"
+ " or ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " --dir <dir> --xid <xid> [--missingok] [--] [<command> <args>*]\n\n"
+ " Options:\n"
+ " -g ... get and print the value\n"
+ " -s ... set the value\n\n"
+ " --xid <xid> ... operate on this context; 'self' means the current one\n"
+ " -t <TAG>=<VALUE>\n"
+ " ... set <TAG> to <VALUE>; this option can be repeated multiple time\n"
+ " --dir <dir> ... read values from files in <dir>. These files must\n"
+ " have a valid TAG as their name\n"
+ " --missingok ... do not fail when the <DIR> from '--dir' does not exist.\n"
+ "\n"
+ " Possible values for TAG are:\n"
+ " context, sysname, nodename, release, version, machine, domainname\n"
+ "\n"
+ "Please report bugs to " PACKAGE_BUGREPORT "\n");
+ exit(res);
+}
+
+static void
+showVersion()
+{
+ WRITE_MSG(1,
+ "vuname " VERSION " -- modifies and shows uname entries of vserver contexts\n"
+ "This program is part of " PACKAGE_STRING "\n\n"
+ "Copyright (C) 2004 Enrico Scholz\n"
+ VERSION_COPYRIGHT_DISCLAIMER);
+ exit(0);
+}
+
+static void
+setFromDir(char const *pathname, bool is_missingok, xid_t xid)
+{
+ struct stat st;
+ size_t i;
+ size_t l_pathname = strlen(pathname);
+ char buf[l_pathname + sizeof("/domainname") + 32];
+
+ if (stat(pathname, &st)==-1) {
+ if (errno==ENOENT && is_missingok) return;
+ PERROR_Q(ENSC_WRAPPERS_PREFIX "fstat", pathname);
+ exit(wrapper_exit_code);
+ }
+
+ memcpy(buf, pathname, l_pathname);
+ if (l_pathname>0 && pathname[l_pathname-1]!='/')
+ buf[l_pathname++] = '/';
+
+ for (i=0; i<DIM_OF(UTS_STRINGS); ++i) {
+ char * ptr = buf+l_pathname;
+ int fd;
+
+ // ignore unimplemented uts-names
+ if (UTS_STRINGS[i]==0) continue;
+ strcpy(ptr, UTS_STRINGS[i]);
+ for (;*ptr;++ptr) *ptr = tolower(*ptr);
+ fd = open(buf, O_RDONLY);
+ if (fd!=-1) {
+ size_t l = Elseek(fd, 0, SEEK_END);
+ char name[l+1];
+ Elseek(fd,0,SEEK_SET);
+ EreadAll(fd, name, l);
+ while (l>0 && name[l-1]=='\n') --l;
+ name[l] = '\0';
+ Eclose(fd);
+
+ if (vc_set_vhi_name(xid, (vc_uts_type)(i), name, l)==-1) {
+ PERROR_U(ENSC_WRAPPERS_PREFIX "vc_set_vhi_name", UTS_STRINGS[i]);
+ exit(wrapper_exit_code);
+ }
+ }
+ }
+}
+
+static size_t
+findUtsIdx(char const *str, size_t len)
+{
+ size_t i;
+ for (i=0; i<DIM_OF(UTS_STRINGS); ++i)
+ if (UTS_STRINGS[i]!=0 && strncasecmp(UTS_STRINGS[i], str, len)==0)
+ return i;
+
+ WRITE_MSG(2, "Tag '");
+ Vwrite (2, str, len);
+ WRITE_STR(2, "' not recognized\n");
+ exit(wrapper_exit_code);
+}
+
+static void
+registerValue(char const *str, struct Tag tags[DIM_OF(UTS_MAPPING)])
+{
+ char const * ptr = strchr(str, '=');
+ size_t idx;
+
+ if (ptr==0) ptr = str + strlen(str);
+ assert(*ptr=='=' || *ptr=='\0');
+
+ idx = findUtsIdx(str, ptr-str);
+
+ if (*ptr=='=') ++ptr;
+ tags[idx].is_set = true;
+ tags[idx].value = ptr;
+}
+
+static void
+printUtsValue(xid_t xid, int val)
+{
+ char buf[128];
+ if (vc_get_vhi_name(xid, val, buf, sizeof(buf)-1)==-1)
+ WRITE_MSG(1, "???");
+ else
+ WRITE_STR(1, buf);
+
+}
+
+int main(int argc, char *argv[])
+{
+ struct Arguments args = {
+ .tags = { [0] = {false,0} },
+ .do_set = false,
+ .dir = 0,
+ .is_missingok= false,
+ .xid = VC_NOCTX,
+ };
+ size_t i;
+
+ assert(DIM_OF(UTS_MAPPING) == DIM_OF(args.tags));
+
+ while (1) {
+ int c = getopt_long(argc, argv, "+gst:", CMDLINE_OPTIONS, 0);
+ if (c==-1) break;
+
+ switch (c) {
+ case CMD_HELP : showHelp(1, argv[0], 0);
+ case CMD_VERSION : showVersion();
+ case CMD_DIR : args.dir = optarg; break;
+ case CMD_MISSINGOK: args.is_missingok = true; break;
+ case 'g' : args.do_set = false; break;
+ case 's' : args.do_set = true; break;
+ case 'x' : args.xid = Evc_xidopt2xid(optarg,true); break;
+ case 't' : registerValue(optarg, args.tags); break;
+ default :
+ WRITE_MSG(2, "Try '");
+ WRITE_STR(2, argv[0]);
+ WRITE_MSG(2, " --help\" for more information.\n");
+ return EXIT_FAILURE;
+ break;
+ }
+ }
+
+ if (args.xid==VC_NOCTX) {
+ WRITE_MSG(2, "No context specified; try '--help' for more information\n");
+ exit(wrapper_exit_code);
+ }
+
+ if (args.dir)
+ setFromDir(args.dir, args.is_missingok, args.xid);
+ else if (args.do_set) {
+ for (i=0; i<DIM_OF(args.tags); ++i) {
+ if (!args.tags[i].is_set) continue;
+ Evc_set_vhi_name(args.xid, i, args.tags[i].value, strlen(args.tags[i].value));
+ }
+ }
+ else if (optind==argc) {
+ char const * delim = "";
+ for (i=0; i<DIM_OF(UTS_MAPPING); ++i) {
+ WRITE_STR(1, delim);
+ printUtsValue(args.xid, i);
+ delim = " ";
+ }
+ WRITE_MSG(1, "\n");
+
+ return EXIT_SUCCESS;
+ }
+ else {
+ char const * delim = "";
+ while (optind <argc) {
+ int idx = findUtsIdx(argv[optind], strlen(argv[optind]));
+ WRITE_STR(1, delim);
+ printUtsValue(args.xid, idx);
+ delim = " ";
+
+ ++optind;
+ }
+ WRITE_MSG(1, "\n");
+
+ return EXIT_SUCCESS;
+ }
+
+ if (optind<argc)
+ EexecvpD(argv[optind], argv+optind);
+
+ return wrapper_exit_code;
+}
git://git.onelab.eu / util-vserver.git / blobdiff