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nsinstall.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Netscape Portable Runtime (NSPR).
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
** Netscape portable install command.
**
** Brendan Eich, 7/20/95
*/
#include <stdio.h>  /* OSF/1 requires this before grp.h, so put it first */
#include <assert.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdarg.h>
#ifdef USE_REENTRANT_LIBC
#include "libc_r.h"
#endif /* USE_REENTRANT_LIBC */

#include "pathsub.h"

#define HAVE_FCHMOD

#if defined(BEOS)
#undef HAVE_FCHMOD
#endif

/*
 * Does getcwd() take NULL as the first argument and malloc
 * the result buffer?
 */
#if !defined(DARWIN) && !defined(NEXTSTEP) && !defined(VMS)
#define GETCWD_CAN_MALLOC
#endif

#ifdef NEXTSTEP
#include <bsd/libc.h>

/*
** balazs.pataki@sztaki.hu: The getcwd is broken in NEXTSTEP (returns 0),
** when called on a mounted fs. Did anyone notice this? Here's an ugly
** workaround ...
*/
#define getcwd(b,s)   my_getcwd(b,s)

static char *
my_getcwd (char *buf, size_t size)
{
    FILE *pwd = popen("pwd", "r");
    char *result = fgets(buf, size, pwd);

    if (result) {
        buf[strlen(buf)-1] = '\0';
    }
    pclose (pwd);
    return buf;
}
#endif /* NEXTSTEP */

#ifdef LINUX
#include <getopt.h>
#endif

#if defined(SCO) || defined(UNIXWARE) || defined(SNI) || defined(NCR) || defined(NEC) || defined(NEXTSTEP)
#if !defined(S_ISLNK) && defined(S_IFLNK)
#define S_ISLNK(a)      (((a) & S_IFMT) == S_IFLNK)
#endif
#endif

#if defined(SNI)
extern int fchmod(int fildes, mode_t mode);
#endif

#ifdef QNX
#define d_ino d_stat.st_ino
#endif

static void
usage(void)
{
    fprintf(stderr,
      "usage: %s [-C cwd] [-L linkprefix] [-m mode] [-o owner] [-g group]\n"
      "       %*s [-DdltR] file [file ...] directory\n",
      program, (int)strlen(program), "");
    exit(2);
}

static int
mkdirs(char *path, mode_t mode)
{
    char *cp;
    struct stat sb;
    int res;
    
    while (*path == '/' && path[1] == '/')
      path++;
    while ((cp = strrchr(path, '/')) && cp[1] == '\0')
      *cp = '\0';
    if (cp && cp != path) {
      *cp = '\0';
      if ((stat(path, &sb) < 0 || !S_ISDIR(sb.st_mode)) &&
          mkdirs(path, mode) < 0) {
          return -1;
      }
      *cp = '/';
    }
    res = mkdir(path, mode);
    if ((res != 0) && (errno == EEXIST))
      return 0;
     else
      return res;
}

static uid_t
touid(char *owner)
{
    struct passwd *pw;
    uid_t uid;
    char *cp;

    pw = getpwnam(owner);
    if (pw)
      return pw->pw_uid;
    uid = strtol(owner, &cp, 0);
    if (uid == 0 && cp == owner)
      fail("cannot find uid for %s", owner);
    return uid;
}

static gid_t
togid(char *group)
{
    struct group *gr;
    gid_t gid;
    char *cp;

    gr = getgrnam(group);
    if (gr)
      return gr->gr_gid;
    gid = strtol(group, &cp, 0);
    if (gid == 0 && cp == group)
      fail("cannot find gid for %s", group);
    return gid;
}

int
main(int argc, char **argv)
{
    int onlydir, dodir, dolink, dorelsymlink, dotimes, opt, len, lplen, tdlen, bnlen, exists, fromfd, tofd, cc, wc;
    mode_t mode = 0755;
    char *linkprefix, *owner, *group, *cp, *cwd, *todir, *toname, *name, *base, *linkname, *bp, buf[BUFSIZ];
    uid_t uid;
    gid_t gid;
    struct stat sb, tosb;
    struct utimbuf utb;

    program = argv[0];
    cwd = linkname = linkprefix = owner = group = 0;
    onlydir = dodir = dolink = dorelsymlink = dotimes = lplen = 0;

    while ((opt = getopt(argc, argv, "C:DdlL:Rm:o:g:t")) != EOF) {
      switch (opt) {
        case 'C':
          cwd = optarg;
          break;
        case 'D':
          onlydir = 1;
          break;
        case 'd':
          dodir = 1;
          break;
        case 'l':
          dolink = 1;
          break;
        case 'L':
          linkprefix = optarg;
          lplen = strlen(linkprefix);
          dolink = 1;
          break;
        case 'R':
          dolink = dorelsymlink = 1;
          break;
        case 'm':
          mode = strtoul(optarg, &cp, 8);
          if (mode == 0 && cp == optarg)
            usage();
          break;
        case 'o':
          owner = optarg;
          break;
        case 'g':
          group = optarg;
          break;
        case 't':
          dotimes = 1;
          break;
        default:
          usage();
      }
    }

    argc -= optind;
    argv += optind;
    if (argc < 2 - onlydir)
      usage();

    todir = argv[argc-1];
    if ((stat(todir, &sb) < 0 || !S_ISDIR(sb.st_mode)) &&
      mkdirs(todir, 0777) < 0) {
      fail("cannot make directory %s", todir);
    }
    if (onlydir)
      return 0;

    if (!cwd) {
#ifdef GETCWD_CAN_MALLOC
      cwd = getcwd(0, PATH_MAX);
#else
      cwd = malloc(PATH_MAX + 1);
      cwd = getcwd(cwd, PATH_MAX);
#endif
    }
    xchdir(todir);
#ifdef GETCWD_CAN_MALLOC
    todir = getcwd(0, PATH_MAX);
#else
    todir = malloc(PATH_MAX + 1);
    todir = getcwd(todir, PATH_MAX);
#endif
    tdlen = strlen(todir);
    xchdir(cwd);
    tdlen = strlen(todir);

    uid = owner ? touid(owner) : -1;
    gid = group ? togid(group) : -1;

    while (--argc > 0) {
      name = *argv++;
      len = strlen(name);
      base = xbasename(name);
      bnlen = strlen(base);
      toname = (char*)xmalloc(tdlen + 1 + bnlen + 1);
      sprintf(toname, "%s/%s", todir, base);
      exists = (lstat(toname, &tosb) == 0);

      if (dodir) {
          /* -d means create a directory, always */
          if (exists && !S_ISDIR(tosb.st_mode)) {
            (void) unlink(toname);
            exists = 0;
          }
          if (!exists && mkdir(toname, mode) < 0)
            fail("cannot make directory %s", toname);
          if ((owner || group) && chown(toname, uid, gid) < 0)
            fail("cannot change owner of %s", toname);
      } else if (dolink) {
          if (*name == '/') {
            /* source is absolute pathname, link to it directly */
            linkname = 0;
          } else {
            if (linkprefix) {
                /* -L implies -l and prefixes names with a $cwd arg. */
                len += lplen + 1;
                linkname = (char*)xmalloc(len + 1);
                sprintf(linkname, "%s/%s", linkprefix, name);
            } else if (dorelsymlink) {
                /* Symlink the relative path from todir to source name. */
                linkname = (char*)xmalloc(PATH_MAX);

                if (*todir == '/') {
                  /* todir is absolute: skip over common prefix. */
                  lplen = relatepaths(todir, cwd, linkname);
                  strcpy(linkname + lplen, name);
                } else {
                  /* todir is named by a relative path: reverse it. */
                  reversepath(todir, name, len, linkname);
                  xchdir(cwd);
                }

                len = strlen(linkname);
            }
            name = linkname;
          }

          /* Check for a pre-existing symlink with identical content. */
          if (exists &&
            (!S_ISLNK(tosb.st_mode) ||
             readlink(toname, buf, sizeof buf) != len ||
             strncmp(buf, name, len) != 0)) {
            (void) (S_ISDIR(tosb.st_mode) ? rmdir : unlink)(toname);
            exists = 0;
          }
          if (!exists && symlink(name, toname) < 0)
            fail("cannot make symbolic link %s", toname);
#ifdef HAVE_LCHOWN
          if ((owner || group) && lchown(toname, uid, gid) < 0)
            fail("cannot change owner of %s", toname);
#endif

          if (linkname) {
            free(linkname);
            linkname = 0;
          }
      } else {
          /* Copy from name to toname, which might be the same file. */
          fromfd = open(name, O_RDONLY);
          if (fromfd < 0 || fstat(fromfd, &sb) < 0)
            fail("cannot access %s", name);
          if (exists && (!S_ISREG(tosb.st_mode) || access(toname, W_OK) < 0))
            (void) (S_ISDIR(tosb.st_mode) ? rmdir : unlink)(toname);
          tofd = open(toname, O_CREAT | O_WRONLY, 0666);
          if (tofd < 0)
            fail("cannot create %s", toname);

          bp = buf;
          while ((cc = read(fromfd, bp, sizeof buf)) > 0) {
            while ((wc = write(tofd, bp, cc)) > 0) {
                if ((cc -= wc) == 0)
                  break;
                bp += wc;
            }
            if (wc < 0)
                fail("cannot write to %s", toname);
          }
          if (cc < 0)
            fail("cannot read from %s", name);

          if (ftruncate(tofd, sb.st_size) < 0)
            fail("cannot truncate %s", toname);
          /*
          ** On OpenVMS we can't chmod() until the file is closed, and we
          ** have to utime() last since fchown/chmod alter the timestamps.
          */
#ifndef VMS
          if (dotimes) {
            utb.actime = sb.st_atime;
            utb.modtime = sb.st_mtime;
            if (utime(toname, &utb) < 0)
                fail("cannot set times of %s", toname);
          }
#ifdef HAVE_FCHMOD
          if (fchmod(tofd, mode) < 0)
#else
          if (chmod(toname, mode) < 0)
#endif
            fail("cannot change mode of %s", toname);
#endif
          if ((owner || group) && fchown(tofd, uid, gid) < 0)
            fail("cannot change owner of %s", toname);

          /* Must check for delayed (NFS) write errors on close. */
          if (close(tofd) < 0)
            fail("cannot write to %s", toname);
          close(fromfd);
#ifdef VMS
          if (chmod(toname, mode) < 0)
            fail("cannot change mode of %s", toname);
          if (dotimes) {
            utb.actime = sb.st_atime;
            utb.modtime = sb.st_mtime;
            if (utime(toname, &utb) < 0)
                fail("cannot set times of %s", toname);
          }
#endif
      }

      free(toname);
    }

    free(cwd);
    free(todir);
    return 0;
}

/*
** Pathname subroutines.
**
** Brendan Eich, 8/29/95
*/

char *program;

void
fail(char *format, ...)
{
    int error;
    va_list ap;

#ifdef USE_REENTRANT_LIBC
    R_STRERROR_INIT_R();
#endif

    error = errno;
    fprintf(stderr, "%s: ", program);
    va_start(ap, format);
    vfprintf(stderr, format, ap);
    va_end(ap);
    if (error)

#ifdef USE_REENTRANT_LIBC
    R_STRERROR_R(errno);
      fprintf(stderr, ": %s", r_strerror_r);
#else
      fprintf(stderr, ": %s", strerror(errno));
#endif

    putc('\n', stderr);
    exit(1);
}

char *
getcomponent(char *path, char *name)
{
    if (*path == '\0')
      return 0;
    if (*path == '/') {
      *name++ = '/';
    } else {
      do {
          *name++ = *path++;
      } while (*path != '/' && *path != '\0');
    }
    *name = '\0';
    while (*path == '/')
      path++;
    return path;
}

#ifdef UNIXWARE_READDIR_BUFFER_TOO_SMALL
/* Sigh.  The static buffer in Unixware's readdir is too small. */
struct dirent * readdir(DIR *d)
{
        static struct dirent *buf = NULL;
#define MAX_PATH_LEN 1024


        if(buf == NULL)
                buf = (struct dirent *) malloc(sizeof(struct dirent) + MAX_PATH_LEN)
;
        return(readdir_r(d, buf));
}
#endif

char *
ino2name(ino_t ino, char *dir)
{
    DIR *dp;
    struct dirent *ep;
    char *name;

    dp = opendir("..");
    if (!dp)
      fail("cannot read parent directory");
    for (;;) {
      if (!(ep = readdir(dp)))
          fail("cannot find current directory");
      if (ep->d_ino == ino)
          break;
    }
    name = xstrdup(ep->d_name);
    closedir(dp);
    return name;
}

void *
xmalloc(size_t size)
{
    void *p = malloc(size);
    if (!p)
      fail("cannot allocate %u bytes", size);
    return p;
}

char *
xstrdup(char *s)
{
    return strcpy((char*)xmalloc(strlen(s) + 1), s);
}

char *
xbasename(char *path)
{
    char *cp;

    while ((cp = strrchr(path, '/')) && cp[1] == '\0')
      *cp = '\0';
    if (!cp) return path;
    return cp + 1;
}

void
xchdir(char *dir)
{
    if (chdir(dir) < 0)
      fail("cannot change directory to %s", dir);
}

int
relatepaths(char *from, char *to, char *outpath)
{
    char *cp, *cp2;
    int len;
    char buf[NAME_MAX];

    assert(*from == '/' && *to == '/');
    for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
      if (*cp == '\0')
          break;
    while (cp[-1] != '/')
      cp--, cp2--;
    if (cp - 1 == to) {
      /* closest common ancestor is /, so use full pathname */
      len = strlen(strcpy(outpath, to));
      if (outpath[len] != '/') {
          outpath[len++] = '/';
          outpath[len] = '\0';
      }
    } else {
      len = 0;
      while ((cp2 = getcomponent(cp2, buf)) != 0) {
          strcpy(outpath + len, "../");
          len += 3;
      }
      while ((cp = getcomponent(cp, buf)) != 0) {
          sprintf(outpath + len, "%s/", buf);
          len += strlen(outpath + len);
      }
    }
    return len;
}

void
reversepath(char *inpath, char *name, int len, char *outpath)
{
    char *cp, *cp2;
    char buf[NAME_MAX];
    struct stat sb;

    cp = strcpy(outpath + PATH_MAX - (len + 1), name);
    cp2 = inpath;
    while ((cp2 = getcomponent(cp2, buf)) != 0) {
      if (strcmp(buf, ".") == 0)
          continue;
      if (strcmp(buf, "..") == 0) {
          if (stat(".", &sb) < 0)
            fail("cannot stat current directory");
          name = ino2name(sb.st_ino, "..");
          len = strlen(name);
          cp -= len + 1;
          strcpy(cp, name);
          cp[len] = '/';
          free(name);
          xchdir("..");
      } else {
          cp -= 3;
          strncpy(cp, "../", 3);
          xchdir(buf);
      }
    }
    strcpy(outpath, cp);
}

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