coreutils/install.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2003 by Glenn McGrath
   4  * SELinux support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
   5  *
   6  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   7  */
   8 //config:config INSTALL
   9 //config:       bool "install"
  10 //config:       default y
  11 //config:       help
  12 //config:         Copy files and set attributes.
  13 //config:
  14 //config:config FEATURE_INSTALL_LONG_OPTIONS
  15 //config:       bool "Enable long options"
  16 //config:       default y
  17 //config:       depends on INSTALL && LONG_OPTS
  18 //config:       help
  19 //config:         Support long options for the install applet.
  20
  21 //applet:IF_INSTALL(APPLET(install, BB_DIR_USR_BIN, BB_SUID_DROP))
  22
  23 //kbuild:lib-$(CONFIG_INSTALL) += install.o
  24
  25 /* -v, -b, -c are ignored */
  26 //usage:#define install_trivial_usage
  27 //usage:        "[-cdDsp] [-o USER] [-g GRP] [-m MODE] [-t DIR] [SOURCE]... DEST"
  28 //usage:#define install_full_usage "\n\n"
  29 //usage:       "Copy files and set attributes\n"
  30 //usage:     "\n        -c      Just copy (default)"
  31 //usage:     "\n        -d      Create directories"
  32 //usage:     "\n        -D      Create leading target directories"
  33 //usage:     "\n        -s      Strip symbol table"
  34 //usage:     "\n        -p      Preserve date"
  35 //usage:     "\n        -o USER Set ownership"
  36 //usage:     "\n        -g GRP  Set group ownership"
  37 //usage:     "\n        -m MODE Set permissions"
  38 //usage:     "\n        -t DIR  Install to DIR"
  39 //usage:        IF_SELINUX(
  40 //usage:     "\n        -Z      Set security context"
  41 //usage:        )
  42
  43 #include "libbb.h"
  44 #include "libcoreutils/coreutils.h"
  45
  46 #if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
  47 static const char install_longopts[] ALIGN1 =
  48         IF_FEATURE_VERBOSE(
  49         "verbose\0"             No_argument       "v"
  50         )
  51         "directory\0"           No_argument       "d"
  52         "preserve-timestamps\0" No_argument       "p"
  53         "strip\0"               No_argument       "s"
  54         "group\0"               Required_argument "g"
  55         "mode\0"                Required_argument "m"
  56         "owner\0"               Required_argument "o"
  57         "target-directory\0"    Required_argument "t"
  58 /* autofs build insists of using -b --suffix=.orig */
  59 /* TODO? (short option for --suffix is -S) */
  60 #if ENABLE_SELINUX
  61         "context\0"             Required_argument "Z"
  62         "preserve_context\0"    No_argument       "\xff"
  63         "preserve-context\0"    No_argument       "\xff"
  64 #endif
  65         ;
  66 #endif
  67
  68
  69 #if ENABLE_SELINUX
  70 static void setdefaultfilecon(const char *path)
  71 {
  72         struct stat s;
  73         security_context_t scontext = NULL;
  74
  75         if (!is_selinux_enabled()) {
  76                 return;
  77         }
  78         if (lstat(path, &s) != 0) {
  79                 return;
  80         }
  81
  82         if (matchpathcon(path, s.st_mode, &scontext) < 0) {
  83                 goto out;
  84         }
  85         if (strcmp(scontext, "<<none>>") == 0) {
  86                 goto out;
  87         }
  88
  89         if (lsetfilecon(path, scontext) < 0) {
  90                 if (errno != ENOTSUP) {
  91                         bb_perror_msg("warning: can't change context"
  92                                         " of %s to %s", path, scontext);
  93                 }
  94         }
  95
  96  out:
  97         freecon(scontext);
  98 }
  99
 100 #endif
 101
 102 int install_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 103 int install_main(int argc, char **argv)
 104 {
 105         struct stat statbuf;
 106         mode_t mode;
 107         uid_t uid;
 108         gid_t gid;
 109         char *arg, *last;
 110         const char *gid_str;
 111         const char *uid_str;
 112         const char *mode_str;
 113         int mkdir_flags = FILEUTILS_RECUR;
 114         int copy_flags = FILEUTILS_DEREFERENCE | FILEUTILS_FORCE;
 115         int opts;
 116         int ret = EXIT_SUCCESS;
 117         int isdir;
 118 #if ENABLE_SELINUX
 119         security_context_t scontext;
 120         bool use_default_selinux_context = 1;
 121 #endif
 122         enum {
 123                 OPT_c             = 1 << 0,
 124                 OPT_v             = 1 << 1,
 125                 OPT_b             = 1 << 2,
 126                 OPT_MKDIR_LEADING = 1 << 3,
 127                 OPT_DIRECTORY     = 1 << 4,
 128                 OPT_PRESERVE_TIME = 1 << 5,
 129                 OPT_STRIP         = 1 << 6,
 130                 OPT_GROUP         = 1 << 7,
 131                 OPT_MODE          = 1 << 8,
 132                 OPT_OWNER         = 1 << 9,
 133                 OPT_TARGET        = 1 << 10,
 134 #if ENABLE_SELINUX
 135                 OPT_SET_SECURITY_CONTEXT = 1 << 11,
 136                 OPT_PRESERVE_SECURITY_CONTEXT = 1 << 12,
 137 #endif
 138         };
 139
 140 #if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
 141         applet_long_options = install_longopts;
 142 #endif
 143         opt_complementary = "t--d:d--t:s--d:d--s" IF_FEATURE_INSTALL_LONG_OPTIONS(IF_SELINUX(":Z--\xff:\xff--Z"));
 144         /* -c exists for backwards compatibility, it's needed */
 145         /* -b is ignored ("make a backup of each existing destination file") */
 146         opts = getopt32(argv, "cvb" "Ddpsg:m:o:t:" IF_SELINUX("Z:"),
 147                         &gid_str, &mode_str, &uid_str, &last
 148                         IF_SELINUX(, &scontext));
 149         argc -= optind;
 150         argv += optind;
 151
 152 #if ENABLE_SELINUX
 153         if (opts & (OPT_PRESERVE_SECURITY_CONTEXT|OPT_SET_SECURITY_CONTEXT)) {
 154                 selinux_or_die();
 155                 use_default_selinux_context = 0;
 156                 if (opts & OPT_PRESERVE_SECURITY_CONTEXT) {
 157                         copy_flags |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
 158                 }
 159                 if (opts & OPT_SET_SECURITY_CONTEXT) {
 160                         setfscreatecon_or_die(scontext);
 161                         copy_flags |= FILEUTILS_SET_SECURITY_CONTEXT;
 162                 }
 163         }
 164 #endif
 165
 166         if ((opts & OPT_v) && FILEUTILS_VERBOSE) {
 167                 mkdir_flags |= FILEUTILS_VERBOSE;
 168                 copy_flags |= FILEUTILS_VERBOSE;
 169         }
 170
 171         /* preserve access and modification time, this is GNU behaviour,
 172          * BSD only preserves modification time */
 173         if (opts & OPT_PRESERVE_TIME) {
 174                 copy_flags |= FILEUTILS_PRESERVE_STATUS;
 175         }
 176         mode = 0755; /* GNU coreutils 6.10 compat */
 177         if (opts & OPT_MODE)
 178                 mode = bb_parse_mode(mode_str, mode);
 179         uid = (opts & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
 180         gid = (opts & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();
 181
 182         /* If -t DIR is in use, then isdir=true, last="DIR" */
 183         isdir = (opts & OPT_TARGET);
 184         if (!(opts & (OPT_TARGET|OPT_DIRECTORY))) {
 185                 /* Neither -t DIR nor -d is in use */
 186                 argc--;
 187                 last = argv[argc];
 188                 argv[argc] = NULL;
 189                 /* coreutils install resolves link in this case, don't use lstat */
 190                 isdir = stat(last, &statbuf) < 0 ? 0 : S_ISDIR(statbuf.st_mode);
 191         }
 192
 193         if (argc < 1)
 194                 bb_show_usage();
 195
 196         while ((arg = *argv++) != NULL) {
 197                 char *dest;
 198
 199                 if (opts & OPT_DIRECTORY) {
 200                         dest = arg;
 201                         /* GNU coreutils 6.9 does not set uid:gid
 202                          * on intermediate created directories
 203                          * (only on last one) */
 204                         if (bb_make_directory(dest, 0755, mkdir_flags)) {
 205                                 ret = EXIT_FAILURE;
 206                                 goto next;
 207                         }
 208                 } else {
 209                         dest = last;
 210                         if (opts & OPT_MKDIR_LEADING) {
 211                                 char *ddir = xstrdup(dest);
 212                                 char *dn = dirname(ddir);
 213                                 /* musl can return read-only "/" or "." string.
 214                                  * bb_make_directory needs writable string.
 215                                  */
 216                                 if ((dn[0] != '/' && dn[0] != '.') || dn[1] != '\0') {
 217                                         bb_make_directory(dn, 0755, mkdir_flags);
 218                                         /* errors are not checked. copy_file
 219                                          * will fail if dir is not created.
 220                                          */
 221                                 }
 222                                 free(ddir);
 223                         }
 224                         if (isdir)
 225                                 dest = concat_path_file(last, bb_basename(arg));
 226                         if (copy_file(arg, dest, copy_flags) != 0) {
 227                                 /* copy is not made */
 228                                 ret = EXIT_FAILURE;
 229                                 goto next;
 230                         }
 231                         if (opts & OPT_STRIP) {
 232                                 char *args[4];
 233                                 args[0] = (char*)"strip";
 234                                 args[1] = (char*)"-p"; /* -p --preserve-dates */
 235                                 args[2] = dest;
 236                                 args[3] = NULL;
 237                                 if (spawn_and_wait(args)) {
 238                                         bb_perror_msg("strip");
 239                                         ret = EXIT_FAILURE;
 240                                 }
 241                         }
 242                 }
 243
 244                 /* Set the file mode (always, not only with -m).
 245                  * GNU coreutils 6.10 is not affected by umask. */
 246                 if (chmod(dest, mode) == -1) {
 247                         bb_perror_msg("can't change %s of %s", "permissions", dest);
 248                         ret = EXIT_FAILURE;
 249                 }
 250 #if ENABLE_SELINUX
 251                 if (use_default_selinux_context)
 252                         setdefaultfilecon(dest);
 253 #endif
 254                 /* Set the user and group id */
 255                 if ((opts & (OPT_OWNER|OPT_GROUP))
 256                  && lchown(dest, uid, gid) == -1
 257                 ) {
 258                         bb_perror_msg("can't change %s of %s", "ownership", dest);
 259                         ret = EXIT_FAILURE;
 260                 }
 261  next:
 262                 if (ENABLE_FEATURE_CLEAN_UP && isdir)
 263                         free(dest);
 264         }
 265
 266         return ret;
 267 }