536 lines
12 KiB
C
536 lines
12 KiB
C
#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif
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/*
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* FreeBSD install - a package for the installation and maintainance
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* of non-core utilities.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Jordan K. Hubbard
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* 18 July 1993
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*
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* Miscellaneous file access utilities.
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*
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*/
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#include "lib.h"
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#include <err.h>
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#include <fetch.h>
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#include <pwd.h>
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#include <time.h>
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#include <sys/wait.h>
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/* Quick check to see if a file exists */
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Boolean
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fexists(const char *fname)
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{
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struct stat dummy;
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if (!lstat(fname, &dummy))
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return TRUE;
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return FALSE;
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}
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/* Quick check to see if something is a directory or symlink to a directory */
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Boolean
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isdir(const char *fname)
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{
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struct stat sb;
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if (lstat(fname, &sb) != FAIL && S_ISDIR(sb.st_mode))
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return TRUE;
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else if (lstat(strconcat(fname, "/."), &sb) != FAIL && S_ISDIR(sb.st_mode))
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return TRUE;
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else
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return FALSE;
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}
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/* Check to see if file is a dir or symlink to a dir, and is empty */
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Boolean
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isemptydir(const char *fname)
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{
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if (isdir(fname)) {
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DIR *dirp;
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struct dirent *dp;
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dirp = opendir(fname);
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if (!dirp)
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return FALSE; /* no perms, leave it alone */
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for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
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if (strcmp(dp->d_name, ".") && strcmp(dp->d_name, "..")) {
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closedir(dirp);
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return FALSE;
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}
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}
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(void)closedir(dirp);
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return TRUE;
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}
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return FALSE;
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}
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/*
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* Returns TRUE if file is a regular file or symlink pointing to a regular
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* file
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*/
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Boolean
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isfile(const char *fname)
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{
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struct stat sb;
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if (stat(fname, &sb) != FAIL && S_ISREG(sb.st_mode))
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return TRUE;
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return FALSE;
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}
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/*
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* Check to see if file is a file or symlink pointing to a file and is empty.
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* If nonexistent or not a file, say "it's empty", otherwise return TRUE if
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* zero sized.
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*/
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Boolean
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isemptyfile(const char *fname)
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{
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struct stat sb;
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if (stat(fname, &sb) != FAIL && S_ISREG(sb.st_mode)) {
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if (sb.st_size != 0)
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return FALSE;
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}
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return TRUE;
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}
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/* Returns TRUE if file is a symbolic link. */
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Boolean
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issymlink(const char *fname)
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{
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struct stat sb;
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if (lstat(fname, &sb) != FAIL && S_ISLNK(sb.st_mode))
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return TRUE;
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return FALSE;
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}
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/* Returns TRUE if file is a URL specification */
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Boolean
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isURL(const char *fname)
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{
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/*
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* I'm sure there are other types of URL specifications that I could
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* also be looking for here, but for now I'll just be happy to get ftp
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* and http working.
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*/
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if (!fname)
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return FALSE;
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while (isspace(*fname))
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++fname;
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if (!strncmp(fname, "ftp://", 6) || !strncmp(fname, "http://", 7))
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return TRUE;
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return FALSE;
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}
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#define HOSTNAME_MAX 64
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/*
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* Try and fetch a file by URL, returning the directory name for where
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* it's unpacked, if successful.
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*/
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char *
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fileGetURL(const char *base, const char *spec)
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{
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char *cp, *rp;
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char fname[FILENAME_MAX];
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char pen[FILENAME_MAX];
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char buf[8192];
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FILE *ftp;
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pid_t tpid;
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int pfd[2], pstat, r, w;
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char *hint;
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int fd;
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rp = NULL;
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/* Special tip that sysinstall left for us */
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hint = getenv("PKG_ADD_BASE");
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if (!isURL(spec)) {
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if (!base && !hint)
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return NULL;
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/*
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* We've been given an existing URL (that's known-good) and now we need
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* to construct a composite one out of that and the basename we were
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* handed as a dependency.
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*/
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if (base) {
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strcpy(fname, base);
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/*
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* Advance back two slashes to get to the root of the package
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* hierarchy
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*/
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cp = strrchr(fname, '/');
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if (cp) {
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*cp = '\0'; /* chop name */
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cp = strrchr(fname, '/');
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}
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if (cp) {
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*(cp + 1) = '\0';
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strcat(cp, "All/");
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strcat(cp, spec);
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strcat(cp, ".tgz");
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}
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else
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return NULL;
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}
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else {
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/*
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* Otherwise, we've been given an environment variable hinting
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* at the right location from sysinstall
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*/
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strcpy(fname, hint);
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strcat(fname, spec);
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strcat(fname, ".tgz");
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}
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}
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else
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strcpy(fname, spec);
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if ((ftp = fetchGetURL(fname, Verbose ? "v" : NULL)) == NULL) {
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printf("Error: FTP Unable to get %s: %s\n",
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fname, fetchLastErrString);
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return NULL;
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}
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if (isatty(0) || Verbose)
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printf("Fetching %s...", fname), fflush(stdout);
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pen[0] = '\0';
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if ((rp = make_playpen(pen, 0)) == NULL) {
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printf("Error: Unable to construct a new playpen for FTP!\n");
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fclose(ftp);
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return NULL;
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}
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if (pipe(pfd) == -1) {
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warn("pipe()");
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cleanup(0);
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exit(2);
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}
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if ((tpid = fork()) == -1) {
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warn("pipe()");
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cleanup(0);
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exit(2);
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}
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if (!tpid) {
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dup2(pfd[0], 0);
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for (fd = getdtablesize() - 1; fd >= 3; --fd)
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close(fd);
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execl("/usr/bin/tar", "tar", Verbose ? "-xzvf" : "-xzf", "-",
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(char *)0);
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_exit(2);
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}
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close(pfd[0]);
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for (;;) {
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if ((r = fread(buf, 1, sizeof buf, ftp)) < 1)
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break;
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if ((w = write(pfd[1], buf, r)) != r)
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break;
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}
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if (ferror(ftp))
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warn("warning: error reading from server");
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fclose(ftp);
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close(pfd[1]);
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if (w == -1)
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warn("warning: error writing to tar");
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tpid = waitpid(tpid, &pstat, 0);
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if (Verbose)
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printf("tar command returns %d status\n", WEXITSTATUS(pstat));
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if (rp && (isatty(0) || Verbose))
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printf(" Done.\n");
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return rp;
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}
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char *
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fileFindByPath(const char *base, const char *fname)
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{
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static char tmp[FILENAME_MAX];
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char *cp;
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const char *suffixes[] = {".tgz", ".tar", ".tbz2", NULL};
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int i;
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if (fexists(fname) && isfile(fname)) {
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strcpy(tmp, fname);
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return tmp;
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}
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if (base) {
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strcpy(tmp, base);
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cp = strrchr(tmp, '/');
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if (cp) {
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*cp = '\0'; /* chop name */
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cp = strrchr(tmp, '/');
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}
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if (cp)
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for (i = 0; suffixes[i] != NULL; i++) {
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*(cp + 1) = '\0';
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strcat(cp, "All/");
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strcat(cp, fname);
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strcat(cp, suffixes[i]);
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if (fexists(tmp))
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return tmp;
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}
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}
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cp = getenv("PKG_PATH");
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while (cp) {
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char *cp2 = strsep(&cp, ":");
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for (i = 0; suffixes[i] != NULL; i++) {
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snprintf(tmp, FILENAME_MAX, "%s/%s%s", cp2 ? cp2 : cp, fname, suffixes[i]);
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if (fexists(tmp) && isfile(tmp))
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return tmp;
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}
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}
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return NULL;
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}
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char *
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fileGetContents(const char *fname)
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{
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char *contents;
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struct stat sb;
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int fd;
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if (stat(fname, &sb) == FAIL) {
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cleanup(0);
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errx(2, __FUNCTION__ ": can't stat '%s'", fname);
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}
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contents = (char *)malloc(sb.st_size + 1);
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fd = open(fname, O_RDONLY, 0);
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if (fd == FAIL) {
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cleanup(0);
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errx(2, __FUNCTION__ ": unable to open '%s' for reading", fname);
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}
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if (read(fd, contents, sb.st_size) != sb.st_size) {
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cleanup(0);
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errx(2, __FUNCTION__ ": short read on '%s' - did not get %qd bytes",
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fname, (long long)sb.st_size);
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}
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close(fd);
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contents[sb.st_size] = '\0';
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return contents;
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}
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/*
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* Takes a filename and package name, returning (in "try") the
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* canonical "preserve" name for it.
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*/
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Boolean
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make_preserve_name(char *try, int max, const char *name, const char *file)
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{
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int len, i;
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if ((len = strlen(file)) == 0)
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return FALSE;
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else
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i = len - 1;
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strncpy(try, file, max);
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if (try[i] == '/') /* Catch trailing slash early and save checking in the loop */
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--i;
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for (; i; i--) {
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if (try[i] == '/') {
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try[i + 1]= '.';
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strncpy(&try[i + 2], &file[i + 1], max - i - 2);
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break;
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}
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}
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if (!i) {
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try[0] = '.';
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strncpy(try + 1, file, max - 1);
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}
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/* I should probably be called rude names for these inline assignments */
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strncat(try, ".", max -= strlen(try));
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strncat(try, name, max -= strlen(name));
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strncat(try, ".", max--);
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strncat(try, "backup", max -= 6);
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return TRUE;
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}
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/* Write the contents of "str" to a file */
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void
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write_file(const char *name, const char *str)
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{
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FILE *fp;
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size_t len;
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fp = fopen(name, "w");
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if (!fp) {
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cleanup(0);
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errx(2, __FUNCTION__ ": cannot fopen '%s' for writing", name);
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}
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len = strlen(str);
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if (fwrite(str, 1, len, fp) != len) {
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cleanup(0);
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errx(2, __FUNCTION__ ": short fwrite on '%s', tried to write %ld bytes", name, (long)len);
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}
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if (fclose(fp)) {
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cleanup(0);
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errx(2, __FUNCTION__ ": failure to fclose '%s'", name);
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}
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}
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void
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copy_file(const char *dir, const char *fname, const char *to)
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{
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char cmd[FILENAME_MAX];
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if (fname[0] == '/')
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snprintf(cmd, FILENAME_MAX, "cp -r %s %s", fname, to);
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else
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snprintf(cmd, FILENAME_MAX, "cp -r %s/%s %s", dir, fname, to);
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if (vsystem(cmd)) {
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cleanup(0);
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errx(2, __FUNCTION__ ": could not perform '%s'", cmd);
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}
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}
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void
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move_file(const char *dir, const char *fname, const char *to)
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{
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char cmd[FILENAME_MAX];
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if (fname[0] == '/')
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snprintf(cmd, FILENAME_MAX, "mv %s %s", fname, to);
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else
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snprintf(cmd, FILENAME_MAX, "mv %s/%s %s", dir, fname, to);
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if (vsystem(cmd)) {
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cleanup(0);
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errx(2, __FUNCTION__ ": could not perform '%s'", cmd);
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}
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}
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/*
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* Copy a hierarchy (possibly from dir) to the current directory, or
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* if "to" is TRUE, from the current directory to a location someplace
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* else.
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*
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* Though slower, using tar to copy preserves symlinks and everything
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* without me having to write some big hairy routine to do it.
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*/
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void
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copy_hierarchy(const char *dir, const char *fname, Boolean to)
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{
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char cmd[FILENAME_MAX * 3];
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if (!to) {
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/* If absolute path, use it */
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if (*fname == '/')
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dir = "/";
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snprintf(cmd, FILENAME_MAX * 3, "tar cf - -C %s %s | tar xpf -",
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dir, fname);
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}
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else
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snprintf(cmd, FILENAME_MAX * 3, "tar cf - %s | tar xpf - -C %s",
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fname, dir);
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#ifdef DEBUG
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printf("Using '%s' to copy trees.\n", cmd);
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#endif
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if (system(cmd)) {
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cleanup(0);
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errx(2, __FUNCTION__ ": could not perform '%s'", cmd);
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}
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}
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/* Unpack a tar file */
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int
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unpack(const char *pkg, const char *flist)
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{
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char args[10], suff[80], *cp;
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args[0] = '\0';
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/*
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* Figure out by a crude heuristic whether this or not this is probably
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* compressed and whichever compression utility was used (gzip or bzip2).
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*/
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if (strcmp(pkg, "-")) {
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cp = strrchr(pkg, '.');
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if (cp) {
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strcpy(suff, cp + 1);
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if (strchr(suff, 'z') || strchr(suff, 'Z')) {
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if (strchr(suff, 'b'))
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strcpy(args, "-y");
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else
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strcpy(args, "-z");
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}
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}
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}
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else
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strcpy(args, "-z");
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strcat(args, " -xpf");
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if (vsystem("tar %s '%s' %s", args, pkg, flist ? flist : "")) {
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warnx("tar extract of %s failed!", pkg);
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return 1;
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}
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return 0;
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}
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/*
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* Using fmt, replace all instances of:
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*
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* %F With the parameter "name"
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* %D With the parameter "dir"
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* %B Return the directory part ("base") of %D/%F
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* %f Return the filename part of %D/%F
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*
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* Does not check for overflow - caution!
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*
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*/
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void
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format_cmd(char *buf, const char *fmt, const char *dir, const char *name)
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{
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char *cp, scratch[FILENAME_MAX * 2];
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while (*fmt) {
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if (*fmt == '%') {
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switch (*++fmt) {
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case 'F':
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strcpy(buf, name);
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buf += strlen(name);
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break;
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case 'D':
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strcpy(buf, dir);
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buf += strlen(dir);
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break;
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case 'B':
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sprintf(scratch, "%s/%s", dir, name);
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cp = &scratch[strlen(scratch) - 1];
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while (cp != scratch && *cp != '/')
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--cp;
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*cp = '\0';
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strcpy(buf, scratch);
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buf += strlen(scratch);
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break;
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case 'f':
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sprintf(scratch, "%s/%s", dir, name);
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cp = &scratch[strlen(scratch) - 1];
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while (cp != scratch && *(cp - 1) != '/')
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--cp;
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strcpy(buf, cp);
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buf += strlen(cp);
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break;
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default:
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*buf++ = *fmt;
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break;
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}
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++fmt;
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}
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else
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*buf++ = *fmt++;
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}
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*buf = '\0';
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}
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