FreeBSD-5.3/usr.sbin/pkg_install/lib/file.c
/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Jordan K. Hubbard
* 18 July 1993
*
* Miscellaneous file access utilities.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.sbin/pkg_install/lib/file.c,v 1.68 2004/07/28 16:03:13 stefanf Exp $");
#include "lib.h"
#include <err.h>
#include <pwd.h>
#include <time.h>
#include <sys/wait.h>
/* Quick check to see if a file exists */
Boolean
fexists(const char *fname)
{
struct stat dummy;
if (!lstat(fname, &dummy))
return TRUE;
return FALSE;
}
/* Quick check to see if something is a directory or symlink to a directory */
Boolean
isdir(const char *fname)
{
struct stat sb;
if (lstat(fname, &sb) != FAIL && S_ISDIR(sb.st_mode))
return TRUE;
else if (lstat(strconcat(fname, "/."), &sb) != FAIL && S_ISDIR(sb.st_mode))
return TRUE;
else
return FALSE;
}
/* Check to see if file is a dir or symlink to a dir, and is empty */
Boolean
isemptydir(const char *fname)
{
if (isdir(fname)) {
DIR *dirp;
struct dirent *dp;
dirp = opendir(fname);
if (!dirp)
return FALSE; /* no perms, leave it alone */
for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
if (strcmp(dp->d_name, ".") && strcmp(dp->d_name, "..")) {
closedir(dirp);
return FALSE;
}
}
(void)closedir(dirp);
return TRUE;
}
return FALSE;
}
/*
* Returns TRUE if file is a regular file or symlink pointing to a regular
* file
*/
Boolean
isfile(const char *fname)
{
struct stat sb;
if (stat(fname, &sb) != FAIL && S_ISREG(sb.st_mode))
return TRUE;
return FALSE;
}
/*
* Check to see if file is a file or symlink pointing to a file and is empty.
* If nonexistent or not a file, say "it's empty", otherwise return TRUE if
* zero sized.
*/
Boolean
isemptyfile(const char *fname)
{
struct stat sb;
if (stat(fname, &sb) != FAIL && S_ISREG(sb.st_mode)) {
if (sb.st_size != 0)
return FALSE;
}
return TRUE;
}
/* Returns TRUE if file is a symbolic link. */
Boolean
issymlink(const char *fname)
{
struct stat sb;
if (lstat(fname, &sb) != FAIL && S_ISLNK(sb.st_mode))
return TRUE;
return FALSE;
}
/* Returns TRUE if file is a URL specification */
Boolean
isURL(const char *fname)
{
/*
* I'm sure there are other types of URL specifications that I could
* also be looking for here, but for now I'll just be happy to get ftp
* and http working.
*/
if (!fname)
return FALSE;
while (isspace(*fname))
++fname;
if (!strncmp(fname, "ftp://", 6) || !strncmp(fname, "http://", 7) ||
!strncmp(fname, "https://", 8) || !strncmp(fname, "file://", 7))
return TRUE;
return FALSE;
}
char *
fileFindByPath(const char *base, const char *fname)
{
static char tmp[FILENAME_MAX];
char *cp;
const char *suffixes[] = {".tbz", ".tgz", ".tar", NULL};
int i;
if (fexists(fname) && isfile(fname)) {
strcpy(tmp, fname);
return tmp;
}
if (base) {
strcpy(tmp, base);
cp = strrchr(tmp, '/');
if (cp) {
*cp = '\0'; /* chop name */
cp = strrchr(tmp, '/');
}
if (cp)
for (i = 0; suffixes[i] != NULL; i++) {
*(cp + 1) = '\0';
strcat(cp, "All/");
strcat(cp, fname);
strcat(cp, suffixes[i]);
if (fexists(tmp))
return tmp;
}
}
cp = getenv("PKG_PATH");
while (cp) {
char *cp2 = strsep(&cp, ":");
for (i = 0; suffixes[i] != NULL; i++) {
snprintf(tmp, FILENAME_MAX, "%s/%s%s", cp2 ? cp2 : cp, fname, suffixes[i]);
if (fexists(tmp) && isfile(tmp))
return tmp;
}
}
return NULL;
}
char *
fileGetContents(const char *fname)
{
char *contents;
struct stat sb;
int fd;
if (stat(fname, &sb) == FAIL) {
cleanup(0);
errx(2, "%s: can't stat '%s'", __func__, fname);
}
contents = (char *)malloc(sb.st_size + 1);
fd = open(fname, O_RDONLY, 0);
if (fd == FAIL) {
cleanup(0);
errx(2, "%s: unable to open '%s' for reading", __func__, fname);
}
if (read(fd, contents, sb.st_size) != sb.st_size) {
cleanup(0);
errx(2, "%s: short read on '%s' - did not get %lld bytes", __func__,
fname, (long long)sb.st_size);
}
close(fd);
contents[sb.st_size] = '\0';
return contents;
}
/*
* Takes a filename and package name, returning (in "try") the
* canonical "preserve" name for it.
*/
Boolean
make_preserve_name(char *try, int max, const char *name, const char *file)
{
int len, i;
if ((len = strlen(file)) == 0)
return FALSE;
else
i = len - 1;
strncpy(try, file, max);
if (try[i] == '/') /* Catch trailing slash early and save checking in the loop */
--i;
for (; i; i--) {
if (try[i] == '/') {
try[i + 1]= '.';
strncpy(&try[i + 2], &file[i + 1], max - i - 2);
break;
}
}
if (!i) {
try[0] = '.';
strncpy(try + 1, file, max - 1);
}
/* I should probably be called rude names for these inline assignments */
strncat(try, ".", max -= strlen(try));
strncat(try, name, max -= strlen(name));
strncat(try, ".", max--);
strncat(try, "backup", max -= 6);
return TRUE;
}
/* Write the contents of "str" to a file */
void
write_file(const char *name, const char *str)
{
FILE *fp;
size_t len;
fp = fopen(name, "w");
if (!fp) {
cleanup(0);
errx(2, "%s: cannot fopen '%s' for writing", __func__, name);
}
len = strlen(str);
if (fwrite(str, 1, len, fp) != len) {
cleanup(0);
errx(2, "%s: short fwrite on '%s', tried to write %ld bytes",
__func__, name, (long)len);
}
if (fclose(fp)) {
cleanup(0);
errx(2, "%s: failure to fclose '%s'", __func__, name);
}
}
void
copy_file(const char *dir, const char *fname, const char *to)
{
char cmd[FILENAME_MAX];
if (fname[0] == '/')
snprintf(cmd, FILENAME_MAX, "/bin/cp -r %s %s", fname, to);
else
snprintf(cmd, FILENAME_MAX, "/bin/cp -r %s/%s %s", dir, fname, to);
if (vsystem(cmd)) {
cleanup(0);
errx(2, "%s: could not perform '%s'", __func__, cmd);
}
}
void
move_file(const char *dir, const char *fname, const char *to)
{
char cmd[FILENAME_MAX];
if (fname[0] == '/')
snprintf(cmd, FILENAME_MAX, "/bin/mv %s %s", fname, to);
else
snprintf(cmd, FILENAME_MAX, "/bin/mv %s/%s %s", dir, fname, to);
if (vsystem(cmd)) {
cleanup(0);
errx(2, "%s: could not perform '%s'", __func__, cmd);
}
}
/*
* Copy a hierarchy (possibly from dir) to the current directory, or
* if "to" is TRUE, from the current directory to a location someplace
* else.
*
* Though slower, using tar to copy preserves symlinks and everything
* without me having to write some big hairy routine to do it.
*/
void
copy_hierarchy(const char *dir, const char *fname, Boolean to)
{
char cmd[FILENAME_MAX * 3];
if (!to) {
/* If absolute path, use it */
if (*fname == '/')
dir = "/";
snprintf(cmd, FILENAME_MAX * 3, "/usr/bin/tar cf - -C %s %s | /usr/bin/tar xpf -",
dir, fname);
}
else
snprintf(cmd, FILENAME_MAX * 3, "/usr/bin/tar cf - %s | /usr/bin/tar xpf - -C %s",
fname, dir);
#ifdef DEBUG
printf("Using '%s' to copy trees.\n", cmd);
#endif
if (system(cmd)) {
cleanup(0);
errx(2, "%s: could not perform '%s'", __func__, cmd);
}
}
/* Unpack a tar file */
int
unpack(const char *pkg, const char *flist)
{
const char *comp, *cp;
char suff[80];
comp = "";
/*
* Figure out by a crude heuristic whether this or not this is probably
* compressed and whichever compression utility was used (gzip or bzip2).
*/
if (strcmp(pkg, "-")) {
cp = strrchr(pkg, '.');
if (cp) {
strcpy(suff, cp + 1);
if (strchr(suff, 'z') || strchr(suff, 'Z')) {
if (strchr(suff, 'b'))
comp = "-j";
else
comp = "-z";
}
}
}
else
#if defined(__FreeBSD_version) && __FreeBSD_version >= 500039
comp = "-j";
#else
comp = "-z";
#endif
if (vsystem("/usr/bin/tar -xp %s -f '%s' %s", comp, pkg, flist ? flist : "")) {
warnx("tar extract of %s failed!", pkg);
return 1;
}
return 0;
}
/*
* Using fmt, replace all instances of:
*
* %F With the parameter "name"
* %D With the parameter "dir"
* %B Return the directory part ("base") of %D/%F
* %f Return the filename part of %D/%F
*
* Does not check for overflow - caution!
*
*/
void
format_cmd(char *buf, int max, const char *fmt, const char *dir, const char *name)
{
char *cp, scratch[FILENAME_MAX * 2];
int l;
while (*fmt && max > 0) {
if (*fmt == '%') {
switch (*++fmt) {
case 'F':
strncpy(buf, name, max);
l = strlen(name);
buf += l, max -= l;
break;
case 'D':
strncpy(buf, dir, max);
l = strlen(dir);
buf += l, max -= l;
break;
case 'B':
snprintf(scratch, FILENAME_MAX * 2, "%s/%s", dir, name);
cp = &scratch[strlen(scratch) - 1];
while (cp != scratch && *cp != '/')
--cp;
*cp = '\0';
strncpy(buf, scratch, max);
l = strlen(scratch);
buf += l, max -= l;
break;
case 'f':
snprintf(scratch, FILENAME_MAX * 2, "%s/%s", dir, name);
cp = &scratch[strlen(scratch) - 1];
while (cp != scratch && *(cp - 1) != '/')
--cp;
strncpy(buf, cp, max);
l = strlen(cp);
buf += l, max -= l;
break;
default:
*buf++ = *fmt;
--max;
break;
}
++fmt;
}
else {
*buf++ = *fmt++;
--max;
}
}
*buf = '\0';
}