source: MondoRescue/branches/stable/mindi-busybox/coreutils/install.c

/* 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 tarball for details.
 *
 * TODO: -d option, need a way of recursively making directories and changing
 *           owner/group, will probably modify bb_make_directory(...)
 */

#include <libgen.h>
#include <getopt.h> /* struct option */

#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"               No_argument       "g"
    "mode\0"                No_argument       "m"
    "owner\0"               No_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: failed to change context of %s to %s", path, scontext);
        }
    }

 out:
    freecon(scontext);
}

#endif

int install_main(int argc, char **argv);
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 flags;
    int ret = EXIT_SUCCESS;
    int isdir;
#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_DIRECTORY     = 1 << 3,
        OPT_PRESERVE_TIME = 1 << 4,
        OPT_STRIP         = 1 << 5,
        OPT_GROUP         = 1 << 6,
        OPT_MODE          = 1 << 7,
        OPT_OWNER         = 1 << 8,
#if ENABLE_SELINUX
        OPT_SET_SECURITY_CONTEXT = 1 << 9,
        OPT_PRESERVE_SECURITY_CONTEXT = 1 << 10,
#endif
    };

#if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
    applet_long_options = install_longopts;
#endif
    opt_complementary = "s--d:d--s" USE_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") */
    flags = getopt32(argv, "cvb" "dpsg:m:o:" USE_SELINUX("Z:"),
            &gid_str, &mode_str, &uid_str USE_SELINUX(, &scontext));
    argc -= optind;
    argv += optind;

#if ENABLE_SELINUX
    if (flags & (OPT_PRESERVE_SECURITY_CONTEXT|OPT_SET_SECURITY_CONTEXT)) {
        selinux_or_die();
        use_default_selinux_context = 0;
        if (flags & OPT_PRESERVE_SECURITY_CONTEXT) {
            copy_flags |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
        }
        if (flags & 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 (flags & OPT_PRESERVE_TIME) {
        copy_flags |= FILEUTILS_PRESERVE_STATUS;
    }
    mode = 0666;
    if (flags & OPT_MODE)
        bb_parse_mode(mode_str, &mode);
    uid = (flags & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
    gid = (flags & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();
    if (flags & (OPT_OWNER|OPT_GROUP))
        umask(0);

    /* Create directories
     * don't use bb_make_directory() as it can't change uid or gid
     * perhaps bb_make_directory() should be improved.
     */
    if (flags & OPT_DIRECTORY) {
        while ((arg = *argv++) != NULL) {
            char *slash = arg;
            while (1) {
                slash = strchr(slash + 1, '/');
                if (slash)
                    *slash = '\0';
                if (mkdir(arg, mode | 0111) == -1) {
                    if (errno != EEXIST) {
                        bb_perror_msg("cannot create %s", arg);
                        ret = EXIT_FAILURE;
                        break;
                    }
                } /* dir was created, chown? */
                else if ((flags & (OPT_OWNER|OPT_GROUP))
                 && lchown(arg, uid, gid) == -1
                ) {
                    bb_perror_msg("cannot change ownership of %s", arg);
                    ret = EXIT_FAILURE;
                    break;
                }
                if (!slash)
                    break;
                *slash = '/';
            }
        }
        return ret;
    }

    if (argc < 2)
        bb_show_usage();

    last = argv[argc - 1];
    argv[argc - 1] = NULL;
    /* coreutils install resolves link in this case, don't use lstat */
    isdir = stat(last, &statbuf) < 0 ? 0 : S_ISDIR(statbuf.st_mode);

    while ((arg = *argv++) != NULL) {
        char *dest = last;
        if (isdir)
            dest = concat_path_file(last, basename(arg));
        if (copy_file(arg, dest, copy_flags)) {
            /* copy is not made */
            ret = EXIT_FAILURE;
            goto next;
        }

        /* Set the file mode */
        if ((flags & OPT_MODE) && chmod(dest, mode) == -1) {
            bb_perror_msg("cannot change permissions of %s", dest);
            ret = EXIT_FAILURE;
        }
#if ENABLE_SELINUX
        if (use_default_selinux_context)
            setdefaultfilecon(dest);
#endif
        /* Set the user and group id */
        if ((flags & (OPT_OWNER|OPT_GROUP))
         && lchown(dest, uid, gid) == -1
        ) {
            bb_perror_msg("cannot change ownership of %s", dest);
            ret = EXIT_FAILURE;
        }
        if (flags & OPT_STRIP) {
            char *args[3];
            args[0] = (char*)"strip";
            args[1] = dest;
            args[2] = NULL;
            if (spawn_and_wait(args)) {
                bb_perror_msg("strip");
                ret = EXIT_FAILURE;
            }
        }
 next:
        if (ENABLE_FEATURE_CLEAN_UP && isdir)
            free(dest);
    }

    return ret;
}