/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
** 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 <errno.h>
#include <dirent.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "pathsub.h"

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

#ifdef SUNOS4
#  include "sunos4.h"
#endif

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

#ifdef __QNX__
#  include <unix.h>
#endif

#ifdef NEED_S_ISLNK
#  if !defined(S_ISLNK) && defined(S_IFLNK)
#    define S_ISLNK(a) (((a) & S_IFMT) == S_IFLNK)
#  endif
#endif

#ifndef _DIRECTORY_SEPARATOR
#  define _DIRECTORY_SEPARATOR "/"
#endif /* _DIRECTORY_SEPARATOR */

#ifdef NEED_FCHMOD_PROTO
extern int fchmod(int fildes, mode_t mode);
#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;
  int l;

  /* strip trailing "/." */
  l = strlen(path);
  if (l > 1 && path[l - 1] == '.' && path[l - 2] == '/') path[l - 2] = 0;

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

static void copyfile(char* name, char* toname, mode_t mode, char* group,
                     char* owner, int dotimes, uid_t uid, gid_t gid) {
  int fromfd, tofd = -1, cc, wc, exists;
  char buf[BUFSIZ], *bp;
  struct stat sb, tosb;
  struct utimbuf utb;

  exists = (lstat(toname, &tosb) == 0);

  fromfd = open(name, O_RDONLY);
  if (fromfd < 0 || fstat(fromfd, &sb) < 0) fail("cannot access %s", name);
  if (exists) {
    if (S_ISREG(tosb.st_mode)) {
      /* See if we can open it. This is more reliable than 'access'. */
      tofd = open(toname, O_CREAT | O_WRONLY, 0666);
    }
    if (tofd < 0) {
      (void)(S_ISDIR(tosb.st_mode) ? rmdir : unlink)(toname);
    }
  }
  if (tofd < 0) {
    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, (unsigned int)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);
#if !defined(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);
#if defined(VMS)
  if (chmod(toname, (mode & (S_IREAD | S_IWRITE))) < 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
}

static void copydir(char* from, char* to, mode_t mode, char* group, char* owner,
                    int dotimes, uid_t uid, gid_t gid) {
  DIR* dir;
  struct dirent* ep;
  struct stat sb;
  char *base, *destdir, *direntry, *destentry;

  base = xbasename(from);

  /* create destination directory */
  destdir = xmalloc((unsigned int)(strlen(to) + 1 + strlen(base) + 1));
  sprintf(destdir, "%s%s%s", to, _DIRECTORY_SEPARATOR, base);
  if (mkdirs(destdir, mode) != 0) {
    fail("cannot make directory %s\n", destdir);
    free(destdir);
    return;
  }

  if (!(dir = opendir(from))) {
    fail("cannot open directory %s\n", from);
    free(destdir);
    return;
  }

  direntry = xmalloc((unsigned int)PATH_MAX);
  destentry = xmalloc((unsigned int)PATH_MAX);

  while ((ep = readdir(dir))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue;

    sprintf(direntry, "%s/%s", from, ep->d_name);
    sprintf(destentry, "%s%s%s", destdir, _DIRECTORY_SEPARATOR, ep->d_name);

    if (stat(direntry, &sb) == 0 && S_ISDIR(sb.st_mode))
      copydir(direntry, destdir, mode, group, owner, dotimes, uid, gid);
    else
      copyfile(direntry, destentry, mode, group, owner, dotimes, uid, gid);
  }

  free(destdir);
  free(direntry);
  free(destentry);
  closedir(dir);
}

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

  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':
        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) {
#ifndef NEEDS_GETCWD
#  ifndef GETCWD_CANT_MALLOC
    cwd = getcwd(0, PATH_MAX);
#  else
    cwd = malloc(PATH_MAX + 1);
    cwd = getcwd(cwd, PATH_MAX);
#  endif
#else
    cwd = malloc(PATH_MAX + 1);
    cwd = getwd(cwd);
#endif
  }

  xchdir(todir);
#ifndef NEEDS_GETCWD
#  ifndef GETCWD_CANT_MALLOC
  todir = getcwd(0, PATH_MAX);
#  else
  todir = malloc(PATH_MAX + 1);
  todir = getcwd(todir, PATH_MAX);
#  endif
#else
  todir = malloc(PATH_MAX + 1);
  todir = getwd(todir);
#endif
  tdlen = strlen(todir);
  xchdir(cwd);
  tdlen = strlen(todir);

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

  while (--argc > 0) {
    name = *argv++;
    len = strlen(name);
    base = xbasename(name);
    bnlen = strlen(base);
    toname = xmalloc((unsigned int)(tdlen + 1 + bnlen + 1));
    sprintf(toname, "%s%s%s", todir, _DIRECTORY_SEPARATOR, 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 (access(name, R_OK) != 0) {
        fail("cannot access %s", name);
      }
      if (*name == '/') {
        /* source is absolute pathname, link to it directly */
        linkname = 0;
      } else {
        if (linkprefix) {
          /* -L prefixes names with a $cwd arg. */
          len += lplen + 1;
          linkname = xmalloc((unsigned int)(len + 1));
          sprintf(linkname, "%s/%s", linkprefix, name);
        } else if (dorelsymlink) {
          /* Symlink the relative path from todir to source name. */
          linkname = 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, (unsigned int)len) != 0 ||
           ((stat(name, &fromsb) == 0) && (fromsb.st_mtime > tosb.st_mtime)))) {
        (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. */
      if (stat(name, &sb) == 0 && S_IFDIR & sb.st_mode) {
        /* then is directory: must explicitly create destination dir  */
        /*  and manually copy files over                              */
        copydir(name, todir, mode, group, owner, dotimes, uid, gid);
      } else {
        copyfile(name, toname, mode, group, owner, dotimes, uid, gid);
      }
    }

    free(toname);
  }

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