vp-build/lib/unpack.c
Juan RP 3f31d9163b lib/unpack.c: change some comments for consistency.
--HG--
extra : convert_revision : 7a016105f8616e09885b46205af883efd1f92dfa
2009-08-16 18:59:53 +02:00

453 lines
12 KiB
C

/*-
* Copyright (c) 2008-2009 Juan Romero Pardines.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <xbps_api.h>
static int unpack_archive_fini(struct archive *, prop_dictionary_t, bool);
static void set_extract_flags(int);
int
xbps_unpack_binary_pkg(prop_dictionary_t pkg, bool essential)
{
prop_string_t filename, repoloc, arch;
struct archive *ar;
const char *pkgname;
char *binfile;
int pkg_fd, rv = 0;
assert(pkg != NULL);
/*
* Append filename to the full path for binary pkg.
*/
prop_dictionary_get_cstring_nocopy(pkg, "pkgname", &pkgname);
filename = prop_dictionary_get(pkg, "filename");
arch = prop_dictionary_get(pkg, "architecture");
repoloc = prop_dictionary_get(pkg, "repository");
if (filename == NULL || arch == NULL || repoloc == NULL)
return ENOTSUP;
binfile = xbps_xasprintf("%s/%s/%s",
prop_string_cstring_nocopy(repoloc),
prop_string_cstring_nocopy(arch),
prop_string_cstring_nocopy(filename));
if (binfile == NULL)
return EINVAL;
if ((pkg_fd = open(binfile, O_RDONLY)) == -1) {
rv = errno;
goto out;
}
ar = archive_read_new();
if (ar == NULL) {
rv = ENOMEM;
goto out2;
}
/*
* Enable support for tar format and all compression methods.
*/
archive_read_support_compression_all(ar);
archive_read_support_format_tar(ar);
if ((rv = archive_read_open_fd(ar, pkg_fd,
ARCHIVE_READ_BLOCKSIZE)) != 0)
goto out3;
rv = unpack_archive_fini(ar, pkg, essential);
/*
* If installation of package was successful, make sure the package
* is really on storage (if possible).
*/
if (rv == 0)
if (fdatasync(pkg_fd) == -1)
rv = errno;
out3:
archive_read_finish(ar);
out2:
(void)close(pkg_fd);
out:
free(binfile);
if (rv == 0) {
/*
* Set package state to unpacked.
*/
rv = xbps_set_pkg_state_installed(pkgname,
XBPS_PKG_STATE_UNPACKED);
}
return rv;
}
/*
* Flags for extracting files in binary packages. If a package
* is marked as "essential", its files will be overwritten and then
* the old and new dictionaries are compared to find out if there
* are some files that were in the old package that should be removed.
*/
#define EXTRACT_FLAGS ARCHIVE_EXTRACT_SECURE_NODOTDOT | \
ARCHIVE_EXTRACT_SECURE_SYMLINKS
#define FEXTRACT_FLAGS ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM | \
ARCHIVE_EXTRACT_TIME | EXTRACT_FLAGS
static void
set_extract_flags(int flags)
{
if (getuid() == 0)
flags = FEXTRACT_FLAGS;
else
flags = EXTRACT_FLAGS;
}
static int
install_config_file(prop_dictionary_t d, struct archive_entry *entry,
const char *pkgname, int flags, bool skip)
{
prop_dictionary_t forigd;
prop_object_t obj, obj2;
prop_object_iterator_t iter, iter2;
const char *cffile, *sha256_new;
char *buf, *sha256_cur = NULL, *sha256_orig = NULL;
int rv = 0;
bool install_new = false;
if (d == NULL)
return 0;
iter = xbps_get_array_iter_from_dict(d, "conf_files");
if (iter == NULL)
return 0;
/*
* Get original hash for the file from current
* installed package.
*/
buf = xbps_xasprintf(".%s/metadata/%s/%s", XBPS_META_PATH,
pkgname, XBPS_PKGFILES);
if (buf == NULL)
return errno;
forigd = prop_dictionary_internalize_from_file(buf);
free(buf);
if (forigd != NULL) {
iter2 = xbps_get_array_iter_from_dict(forigd, "conf_files");
if (iter2 != NULL) {
while ((obj2 = prop_object_iterator_next(iter2))) {
prop_dictionary_get_cstring_nocopy(obj2,
"file", &cffile);
if (strstr(archive_entry_pathname(entry),
cffile)) {
prop_dictionary_get_cstring(obj2,
"sha256", &sha256_orig);
break;
}
}
prop_object_iterator_release(iter2);
}
prop_object_release(forigd);
}
/*
* Compare original, installed and new hash for current file.
*/
while ((obj = prop_object_iterator_next(iter))) {
prop_dictionary_get_cstring_nocopy(obj, "file", &cffile);
if (strstr(archive_entry_pathname(entry), cffile) == 0)
continue;
buf = xbps_xasprintf(".%s", cffile);
if (buf == NULL) {
prop_object_iterator_release(iter);
return errno;
}
prop_dictionary_get_cstring_nocopy(obj, "sha256", &sha256_new);
sha256_cur = xbps_get_file_hash(buf);
free(buf);
if (sha256_cur == NULL) {
if (errno == ENOENT) {
/*
* File not installed, install new one.
*/
install_new = true;
break;
} else {
rv = errno;
break;
}
}
/*
* Orig = X, Curr = X, New = X
*
* Install new file.
*/
if ((strcmp(sha256_orig, sha256_cur) == 0) &&
(strcmp(sha256_cur, sha256_new) == 0) &&
(strcmp(sha256_orig, sha256_new) == 0)) {
install_new = true;
break;
/*
* Orig = X, Curr = X, New = Y
*
* Install new file.
*/
} else if ((strcmp(sha256_orig, sha256_cur) == 0) &&
(strcmp(sha256_cur, sha256_new)) &&
(strcmp(sha256_orig, sha256_new))) {
install_new = true;
break;
/*
* Orig = X, Curr = Y, New = X
*
* Keep current file as is.
*/
} else if ((strcmp(sha256_orig, sha256_cur)) &&
(strcmp(sha256_orig, sha256_new) == 0) &&
(strcmp(sha256_cur, sha256_new))) {
skip = true;
break;
/*
* Orig = X, Curr = Y, New = Y
*
* Install new file.
*/
} else if ((strcmp(sha256_orig, sha256_cur)) &&
(strcmp(sha256_cur, sha256_new) == 0) &&
(strcmp(sha256_orig, sha256_new))) {
install_new = true;
break;
/*
* Orig = X, Curr = Y, New = Z
*
* Install new file as file.new.
*/
} else if ((strcmp(sha256_orig, sha256_cur)) &&
(strcmp(sha256_cur, sha256_new)) &&
(strcmp(sha256_orig, sha256_new))) {
buf = xbps_xasprintf(".%s.new", cffile);
if (buf == NULL) {
rv = errno;
break;
}
printf("Installing new configuration "
"file %s.new\n", cffile);
install_new = true;
archive_entry_set_pathname(entry, buf);
free(buf);
break;
}
}
if (install_new)
set_extract_flags(flags);
if (sha256_orig)
free(sha256_orig);
if (sha256_cur)
free(sha256_cur);
prop_object_iterator_release(iter);
return rv;
}
/*
* TODO: remove printfs and return appropiate errors to be interpreted by
* the consumer.
*/
static int
unpack_archive_fini(struct archive *ar, prop_dictionary_t pkg,
bool essential)
{
prop_dictionary_t filesd;
struct archive_entry *entry;
const char *pkgname, *version, *rootdir;
char *buf, *buf2;
int rv = 0, flags, lflags, eflags;
bool actgt = false, skip_entry = false;
assert(ar != NULL);
assert(pkg != NULL);
rootdir = xbps_get_rootdir();
flags = xbps_get_flags();
if (strcmp(rootdir, "") == 0)
rootdir = "/";
if (chdir(rootdir) == -1)
return errno;
prop_dictionary_get_cstring_nocopy(pkg, "pkgname", &pkgname);
prop_dictionary_get_cstring_nocopy(pkg, "version", &version);
set_extract_flags(lflags);
while (archive_read_next_header(ar, &entry) == ARCHIVE_OK) {
/*
* Always overwrite pkg metadata files. Other files
* in the archive aren't overwritten unless a package
* defines the "essential" boolean obj.
*/
eflags = 0;
eflags = lflags;
if (strcmp("./INSTALL", archive_entry_pathname(entry)) &&
strcmp("./REMOVE", archive_entry_pathname(entry)) &&
strcmp("./files.plist", archive_entry_pathname(entry)) &&
strcmp("./props.plist", archive_entry_pathname(entry))) {
if (essential == false) {
eflags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
eflags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
}
}
/*
* Run the pre INSTALL action if the file is there.
*/
if (strcmp("./INSTALL", archive_entry_pathname(entry)) == 0) {
buf = xbps_xasprintf(".%s/metadata/%s/INSTALL",
XBPS_META_PATH, pkgname);
if (buf == NULL)
return errno;
actgt = true;
archive_entry_set_pathname(entry, buf);
if (archive_read_extract(ar, entry, eflags) != 0) {
if ((rv = archive_errno(ar)) != EEXIST) {
free(buf);
return rv;
}
}
if ((rv = xbps_file_chdir_exec(rootdir, buf, "pre",
pkgname, version, NULL)) != 0) {
free(buf);
printf("%s: preinst action target error %s\n",
pkgname, strerror(errno));
return rv;
}
/* pass to the next entry if successful */
free(buf);
continue;
/*
* Unpack metadata files in final directory.
*/
} else if (strcmp("./REMOVE",
archive_entry_pathname(entry)) == 0) {
buf2 = xbps_xasprintf(".%s/metadata/%s/REMOVE",
XBPS_META_PATH, pkgname);
if (buf2 == NULL)
return errno;
archive_entry_set_pathname(entry, buf2);
free(buf2);
buf2 = NULL;
} else if (strcmp("./files.plist",
archive_entry_pathname(entry)) == 0) {
/*
* Now we have a dictionary from the entry
* in memory. Will be written to disk later, when
* all files are extracted.
*/
filesd = xbps_read_dict_from_archive_entry(ar, entry);
if (filesd == NULL)
return errno;
/* Pass to next entry */
continue;
} else if (strcmp("./props.plist",
archive_entry_pathname(entry)) == 0) {
buf2 = xbps_xasprintf(".%s/metadata/%s/props.plist",
XBPS_META_PATH, pkgname);
if (buf2 == NULL)
return errno;
archive_entry_set_pathname(entry, buf2);
free(buf2);
}
/*
* Handle configuration files.
*/
if ((rv = install_config_file(filesd, entry, pkgname,
eflags, skip_entry)) != 0) {
prop_object_release(filesd);
return rv;
}
if (skip_entry) {
archive_read_data_skip(ar);
skip_entry = false;
continue;
}
/*
* Extract entry from archive.
*/
if (archive_read_extract(ar, entry, eflags) != 0) {
rv = archive_errno(ar);
if (rv != EEXIST) {
printf("ERROR: %s...exiting!\n",
archive_error_string(ar));
return rv;;
} else if (rv == EEXIST) {
if (flags & XBPS_FLAG_VERBOSE) {
printf("WARNING: ignoring existent "
"path: %s\n",
archive_entry_pathname(entry));
}
rv = 0;
continue;
}
}
if (flags & XBPS_FLAG_VERBOSE)
printf(" %s\n", archive_entry_pathname(entry));
}
if ((rv = archive_errno(ar)) == 0) {
/*
* Now that all files were successfully unpacked, we
* can safely externalize files.plist because the path
* is reachable.
*/
buf2 = xbps_xasprintf(".%s/metadata/%s/files.plist",
XBPS_META_PATH, pkgname);
if (!prop_dictionary_externalize_to_file(filesd, buf2)) {
prop_object_release(filesd);
free(buf2);
return errno;
}
free(buf2);
}
prop_object_release(filesd);
return rv;
}