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/* Copyright 2014 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
*
* Wrapper for coreutil's install to preserve extended attributes.
*
* Copyright 2014 Anthony G. Basile - <blueness@gentoo.org>
* Copyright 2014 Mike Frysinger - <vapier@gentoo.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <fnmatch.h>
#include <ctype.h>
#include <getopt.h>
#include <libgen.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/xattr.h>
static char *
xstrdup(const char *s)
{
char *ret = strdup(s);
if (ret == NULL)
err(1, "strdup() failed");
return ret;
}
static void *
xmalloc(size_t size)
{
void *ret = malloc(size);
if (ret == NULL)
err(1, "malloc() failed");
return ret;
}
static void *
xrealloc(void *p, size_t size)
{
void *ret = realloc(p, size);
if (ret == NULL)
err(1, "realloc() failed");
return ret;
}
static char *
path_join(const char *path, const char *file)
{
size_t len_path = strlen(path);
size_t len_file = strlen(file);
char *ret = xmalloc(len_path + len_file + 2);
memcpy(ret, path, len_path);
ret[len_path] = '/';
memcpy(ret + len_path + 1, file, len_file);
ret[len_path + len_file + 1] = '\0';
return ret;
}
static ssize_t
xlistxattr(const char *path, char *list, size_t size)
{
ssize_t ret = listxattr(path, list, size);
if (ret < 0)
err(1, "listxattr() failed");
return ret;
}
static ssize_t
xgetxattr(const char *path, char *list, char *value, size_t size)
{
ssize_t ret = getxattr(path, list, value, size);
if (ret < 0)
err(1, "getxattr() failed");
return ret;
}
static ssize_t
xsetxattr(const char *path, char *list, char *value, size_t size)
{
ssize_t ret = setxattr(path, list, value, size, 0);
if (ret < 0)
err(1, "setxattr() failed");
return ret;
}
char *exclude; /* strings of excluded xattr names */
size_t len_exclude; /* length of the string of excluded xattr names */
static void
copyxattr(const char *source, const char *target)
{
ssize_t i, j; /* counters to walk through strings */
ssize_t lsize, xsize; /* size in bytes of the list of xattrs and the values */
char *lxattr; /* string of xattr names */
static char *value = NULL ; /* string of an xattr name's value */
static size_t value_size = 0; /* size of the value string */
lsize = xlistxattr(source, NULL, 0);
lxattr = xmalloc(lsize);
xlistxattr(source, lxattr, lsize);
i = 0;
while (1) {
while (lxattr[i++] == 0)
continue;
if (i >= lsize)
break;
j = 0;
while (1) {
while (exclude[j++] == 0)
continue;
if (j >= len_exclude)
break;
if (!fnmatch(&exclude[j - 1], &lxattr[i - 1], 0))
goto skip;
while (exclude[j++] != 0)
continue;
if (j >= len_exclude)
break;
}
xsize = xgetxattr(source, &lxattr[i-1], 0, 0);
if (xsize > value_size) {
value_size = xsize;
value = xrealloc(value, value_size);
}
xgetxattr(source, &lxattr[i-1], value, xsize);
xsetxattr(target, &lxattr[i-1], value, xsize);
skip:
while (lxattr[i++] != 0)
continue;
if (i >= lsize)
break;
}
/* No need to free(value) on return because its static and we */
/* just keep reusing the same allocated memory on each call. */
free(lxattr);
}
static char *
which(char *mypath, char *portage_helper_path)
{
/* $PATH for system install */
char *path = NULL, *env_path = getenv("PATH");
/* If we don't have $PATH in our environment, then pick a sane path. */
if (env_path == NULL) {
size_t len = confstr(_CS_PATH, 0, 0);
path = xmalloc(len);
confstr(_CS_PATH, path, len);
} else
path = xstrdup(env_path);
char *dir; /* one directory in the colon delimited $PATH string */
char *canpath; /* candidate install's canonical path */
char *savedptr; /* reentrant context for strtok_r() */
dir = strtok_r(path, ":", &savedptr);
while (dir) {
char *canfile = path_join(dir, "install");
canpath = realpath(canfile, NULL);
free(canfile);
/* ignore invalid paths that cannot be canonicalized */
if (!canpath)
goto skip;
/* If argv[0]'s canonical path == candidate install's canonical path,
* then we skip this path otheriwise we get into an infinite self-invocation.
*/
if (!strcmp(mypath, canpath))
goto skip;
/* If portage install's canonical path == candidate install's canonical path,
* then we skip this path otheriwise we get into an infinite self-invocation.
*/
if (portage_helper_path)
if (!strcmp(portage_helper_path, canpath))
goto skip;
/* If the canpath exists and is either a regular file or sym link,
* assume we found the system's install.
*/
struct stat s;
if (stat(canpath, &s) == 0)
if (S_ISREG(s.st_mode)) {
free(path);
return canpath;
}
skip:
free(canpath);
dir = strtok_r(NULL, ":", &savedptr);
}
if (env_path == NULL)
err(1, "failed to find 'install' in standard utilities path");
else
err(1, "failed to find 'install' in PATH=%s", env_path);
}
int
main(int argc, char* argv[])
{
int i;
int status; /* exit status of child "install" process */
int opts_directory = 0; /* if -d was given, then all arguments are directories */
int opts_target_directory = 0; /* if -t was given, then we're installing to a target directory */
int target_is_directory = 0; /* is the target a directory? */
int first, last; /* argv indices of the first file/directory and last */
char *target; /* the target file or directory */
char *path; /* path to the target file */
char *mypath = realpath("/proc/self/exe", NULL); /* path to argv[0] */
char *install; /* path to the system install */
struct stat s; /* test if a file is a regular file or a directory */
char *portage_xattr_exclude; /* strings of excluded xattr names from $PORTAGE_XATTR_EXCLUDE */
portage_xattr_exclude = getenv("PORTAGE_XATTR_EXCLUDE");
if (portage_xattr_exclude == NULL)
exclude = xstrdup("btrfs.* security.* trusted.* system.nfs4_acl");
else
exclude = xstrdup(portage_xattr_exclude);
len_exclude = strlen(exclude);
/* We convert exclude[] to an array of concatenated NUL terminated
* strings. Also, no need to free(exclude) before we exit().
*/
char *p = exclude;
while ((p = strchr(p, ' ')))
*p++ = '\0';
opterr = 0; /* we skip many legitimate flags, so silence any warning */
while (1) {
static struct option long_options[] = {
{ "directory", no_argument, 0, 'd'},
{ "target-directory", required_argument, 0, 't'},
{ "group", required_argument, 0, 'g'},
{ "mode", required_argument, 0, 'm'},
{ "owner", required_argument, 0, 'o'},
{ "suffix", required_argument, 0, 'S'},
{ "context", optional_argument, 0, 'Z'},
{ "backup", optional_argument, 0, 'b'},
{ "help", no_argument, 0, 0 },
{ 0, 0, 0, 0 }
};
int option_index;
int c = getopt_long(argc, argv, "dt:g:m:o:S:Z:", long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 0:
case 'g':
case 'm':
case 'o':
case 'S':
case 'Z':
case 'b':
case '?':
/* We skip the flags we don't care about */
break;
case 'd':
opts_directory = 1;
break;
case 't':
opts_target_directory = 1;
target = optarg;
break;
default:
err(1, "getopt_long() failed");
}
}
first = optind;
last = argc - 1;
/* Do we need to chdir to OLDPWD? This is required when we are called my a
* wrapper like ${__PORTAGE_HELPER_PATH} which then passes its directory as
* $PWD and the source directory from which it was called as $OLDPWD. But
* we want the system install to run in the source directory, ie $OLDPWD,
* so we chdir to it. Currently we assume that if __PORTAGE_HELPER_PATH
* is set, then we chdir to oldpwd.
*/
char *oldpwd = getenv("OLDPWD");
char *portage_helper_path = getenv("__PORTAGE_HELPER_PATH");
char *portage_helper_canpath = NULL;
if (portage_helper_path)
chdir(oldpwd);
switch (fork()) {
case -1:
err(1, "fork() failed");
case 0:
/* find system install avoiding mypath and portage_helper_path! */
if (portage_helper_path)
portage_helper_canpath = realpath(portage_helper_path, NULL);
install = which(mypath, portage_helper_canpath);
free(mypath);
free(portage_helper_canpath);
argv[0] = install; /* so coreutils' lib/program.c behaves */
execv(install, argv); /* The kernel will free(install). */
err(1, "execv() failed");
default:
wait(&status);
/* Are there enough files/directories on the cmd line to
* proceed? This can happen if install is called with no
* arguments or with just --help. In which case there is
* nothing for the parent to do.
*/
if (first >= last)
goto done;
/* If all the targets are directories, do nothing. */
if (opts_directory)
goto done;
if (!opts_target_directory) {
target = argv[last];
if (stat(target, &s) != 0)
return EXIT_FAILURE;
target_is_directory = S_ISDIR(s.st_mode);
} else {
/* target was set above with the -t option */
target_is_directory = 1;
}
if (target_is_directory) {
/* If -t was passed, then the last argv *is*
* a file, so we include it for copyxattr().
*/
if (opts_target_directory)
last++;
for (i = first; i < last; i++) {
if (stat(argv[i], &s) != 0)
return EXIT_FAILURE;
/* We reproduce install's behavior and skip
* all extra directories on the command line
* that are not the final target directory.
*/
if (S_ISDIR(s.st_mode))
continue;
path = path_join(target, basename(argv[i]));
copyxattr(argv[i], path);
free(path);
}
} else
copyxattr(argv[first], target);
done:
/* Do the right thing and pass the signal back up. See:
* http://www.cons.org/cracauer/sigint.html
*/
if (WIFSIGNALED(status)) {
int signum = WTERMSIG(status);
kill(getpid(), signum);
return 128 + signum;
} else if (WIFEXITED(status))
return WEXITSTATUS(status);
else
return EXIT_FAILURE; /* We should never get here. */
}
}
|