source: MondoRescue/branches/3.2/mindi-busybox/coreutils/install.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Copyright (C) 2003 by Glenn McGrath
 * SELinux support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* -v, -b, -c are ignored */
//usage:#define install_trivial_usage
//usage:    "[-cdDsp] [-o USER] [-g GRP] [-m MODE] [SOURCE]... DEST"
//usage:#define install_full_usage "\n\n"
//usage:       "Copy files and set attributes\n"
//usage:     "\n    -c  Just copy (default)"
//usage:     "\n    -d  Create directories"
//usage:     "\n    -D  Create leading target directories"
//usage:     "\n    -s  Strip symbol table"
//usage:     "\n    -p  Preserve date"
//usage:     "\n    -o USER Set ownership"
//usage:     "\n    -g GRP  Set group ownership"
//usage:     "\n    -m MODE Set permissions"
//usage:    IF_SELINUX(
//usage:     "\n    -Z  Set security context"
//usage:    )

#include "libbb.h"
#include "libcoreutils/coreutils.h"

#if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
static const char install_longopts[] ALIGN1 =
    "directory\0"           No_argument       "d"
    "preserve-timestamps\0" No_argument       "p"
    "strip\0"               No_argument       "s"
    "group\0"               Required_argument "g"
    "mode\0"                Required_argument "m"
    "owner\0"               Required_argument "o"
/* autofs build insists of using -b --suffix=.orig */
/* TODO? (short option for --suffix is -S) */
#if ENABLE_SELINUX
    "context\0"             Required_argument "Z"
    "preserve_context\0"    No_argument       "\xff"
    "preserve-context\0"    No_argument       "\xff"
#endif
    ;
#endif


#if ENABLE_SELINUX
static void setdefaultfilecon(const char *path)
{
    struct stat s;
    security_context_t scontext = NULL;

    if (!is_selinux_enabled()) {
        return;
    }
    if (lstat(path, &s) != 0) {
        return;
    }

    if (matchpathcon(path, s.st_mode, &scontext) < 0) {
        goto out;
    }
    if (strcmp(scontext, "<<none>>") == 0) {
        goto out;
    }

    if (lsetfilecon(path, scontext) < 0) {
        if (errno != ENOTSUP) {
            bb_perror_msg("warning: can't change context"
                    " of %s to %s", path, scontext);
        }
    }

 out:
    freecon(scontext);
}

#endif

int install_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int install_main(int argc, char **argv)
{
    struct stat statbuf;
    mode_t mode;
    uid_t uid;
    gid_t gid;
    char *arg, *last;
    const char *gid_str;
    const char *uid_str;
    const char *mode_str;
    int copy_flags = FILEUTILS_DEREFERENCE | FILEUTILS_FORCE;
    int opts;
    int min_args = 1;
    int ret = EXIT_SUCCESS;
    int isdir = 0;
#if ENABLE_SELINUX
    security_context_t scontext;
    bool use_default_selinux_context = 1;
#endif
    enum {
        OPT_c             = 1 << 0,
        OPT_v             = 1 << 1,
        OPT_b             = 1 << 2,
        OPT_MKDIR_LEADING = 1 << 3,
        OPT_DIRECTORY     = 1 << 4,
        OPT_PRESERVE_TIME = 1 << 5,
        OPT_STRIP         = 1 << 6,
        OPT_GROUP         = 1 << 7,
        OPT_MODE          = 1 << 8,
        OPT_OWNER         = 1 << 9,
#if ENABLE_SELINUX
        OPT_SET_SECURITY_CONTEXT = 1 << 10,
        OPT_PRESERVE_SECURITY_CONTEXT = 1 << 11,
#endif
    };

#if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
    applet_long_options = install_longopts;
#endif
    opt_complementary = "s--d:d--s" IF_FEATURE_INSTALL_LONG_OPTIONS(IF_SELINUX(":Z--\xff:\xff--Z"));
    /* -c exists for backwards compatibility, it's needed */
    /* -v is ignored ("print name of each created directory") */
    /* -b is ignored ("make a backup of each existing destination file") */
    opts = getopt32(argv, "cvb" "Ddpsg:m:o:" IF_SELINUX("Z:"),
            &gid_str, &mode_str, &uid_str IF_SELINUX(, &scontext));
    argc -= optind;
    argv += optind;

#if ENABLE_SELINUX
    if (opts & (OPT_PRESERVE_SECURITY_CONTEXT|OPT_SET_SECURITY_CONTEXT)) {
        selinux_or_die();
        use_default_selinux_context = 0;
        if (opts & OPT_PRESERVE_SECURITY_CONTEXT) {
            copy_flags |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
        }
        if (opts & OPT_SET_SECURITY_CONTEXT) {
            setfscreatecon_or_die(scontext);
            copy_flags |= FILEUTILS_SET_SECURITY_CONTEXT;
        }
    }
#endif

    /* preserve access and modification time, this is GNU behaviour,
     * BSD only preserves modification time */
    if (opts & OPT_PRESERVE_TIME) {
        copy_flags |= FILEUTILS_PRESERVE_STATUS;
    }
    mode = 0755; /* GNU coreutils 6.10 compat */
    if (opts & OPT_MODE)
        bb_parse_mode(mode_str, &mode);
    uid = (opts & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
    gid = (opts & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();

    last = argv[argc - 1];
    if (!(opts & OPT_DIRECTORY)) {
        argv[argc - 1] = NULL;
        min_args++;

        /* coreutils install resolves link in this case, don't use lstat */
        isdir = stat(last, &statbuf) < 0 ? 0 : S_ISDIR(statbuf.st_mode);
    }

    if (argc < min_args)
        bb_show_usage();

    while ((arg = *argv++) != NULL) {
        char *dest = last;
        if (opts & OPT_DIRECTORY) {
            dest = arg;
            /* GNU coreutils 6.9 does not set uid:gid
             * on intermediate created directories
             * (only on last one) */
            if (bb_make_directory(dest, 0755, FILEUTILS_RECUR)) {
                ret = EXIT_FAILURE;
                goto next;
            }
        } else {
            if (opts & OPT_MKDIR_LEADING) {
                char *ddir = xstrdup(dest);
                bb_make_directory(dirname(ddir), 0755, FILEUTILS_RECUR);
                /* errors are not checked. copy_file
                 * will fail if dir is not created. */
                free(ddir);
            }
            if (isdir)
                dest = concat_path_file(last, bb_basename(arg));
            if (copy_file(arg, dest, copy_flags) != 0) {
                /* copy is not made */
                ret = EXIT_FAILURE;
                goto next;
            }
            if (opts & OPT_STRIP) {
                char *args[4];
                args[0] = (char*)"strip";
                args[1] = (char*)"-p"; /* -p --preserve-dates */
                args[2] = dest;
                args[3] = NULL;
                if (spawn_and_wait(args)) {
                    bb_perror_msg("strip");
                    ret = EXIT_FAILURE;
                }
            }
        }

        /* Set the file mode (always, not only with -m).
         * GNU coreutils 6.10 is not affected by umask. */
        if (chmod(dest, mode) == -1) {
            bb_perror_msg("can't change %s of %s", "permissions", dest);
            ret = EXIT_FAILURE;
        }
#if ENABLE_SELINUX
        if (use_default_selinux_context)
            setdefaultfilecon(dest);
#endif
        /* Set the user and group id */
        if ((opts & (OPT_OWNER|OPT_GROUP))
         && lchown(dest, uid, gid) == -1
        ) {
            bb_perror_msg("can't change %s of %s", "ownership", dest);
            ret = EXIT_FAILURE;
        }
 next:
        if (ENABLE_FEATURE_CLEAN_UP && isdir)
            free(dest);
    }

    return ret;
}