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|
/*
* dpkg-deb - construction and deconstruction of *.deb archives
* build.c - building archives
*
* Copyright © 1994,1995 Ian Jackson <ian@chiark.greenend.org.uk>
* Copyright © 2000,2001 Wichert Akkerman <wakkerma@debian.org>
* Copyright © 2007-2014 Guillem Jover <guillem@debian.org>
*
* This 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 2 of the License, or
* (at your option) any later version.
*
* This 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 <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/c-ctype.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/path.h>
#include <dpkg/varbuf.h>
#include <dpkg/fdio.h>
#include <dpkg/buffer.h>
#include <dpkg/subproc.h>
#include <dpkg/compress.h>
#include <dpkg/ar.h>
#include <dpkg/options.h>
#include "dpkg-deb.h"
/**
* Simple structure to store information about a file.
*/
struct file_info {
struct file_info *next;
struct stat st;
char *fn;
};
static struct file_info *
file_info_new(const char *filename)
{
struct file_info *fi;
fi = m_malloc(sizeof(*fi));
fi->fn = m_strdup(filename);
fi->next = NULL;
return fi;
}
static void
file_info_free(struct file_info *fi)
{
free(fi->fn);
free(fi);
}
static struct file_info *
file_info_find_name(struct file_info *list, const char *filename)
{
struct file_info *node;
for (node = list; node; node = node->next)
if (strcmp(node->fn, filename) == 0)
return node;
return NULL;
}
/**
* Read a filename from the file descriptor and create a file_info struct.
*
* @return A file_info struct or NULL if there is nothing to read.
*/
static struct file_info *
file_info_get(const char *root, int fd)
{
static struct varbuf fn = VARBUF_INIT;
struct file_info *fi;
size_t root_len;
varbuf_reset(&fn);
root_len = varbuf_printf(&fn, "%s/", root);
while (1) {
int res;
varbuf_grow(&fn, 1);
res = fd_read(fd, (fn.buf + fn.used), 1);
if (res < 0)
return NULL;
if (res == 0) /* EOF -> parent died. */
return NULL;
if (fn.buf[fn.used] == '\0')
break;
varbuf_trunc(&fn, fn.used + 1);
}
fi = file_info_new(fn.buf + root_len);
if (lstat(fn.buf, &(fi->st)) != 0)
ohshite(_("unable to stat file name '%.250s'"), fn.buf);
return fi;
}
/**
* Add a new file_info struct to a single linked list of file_info structs.
*
* We perform a slight optimization to work around a ‘feature’ in tar: tar
* always recurses into subdirectories if you list a subdirectory. So if an
* entry is added and the previous entry in the list is its subdirectory we
* remove the subdirectory.
*
* After a file_info struct is added to a list it may no longer be freed, we
* assume full responsibility for its memory.
*/
static void
file_info_list_append(struct file_info **head, struct file_info **tail,
struct file_info *fi)
{
if (*head == NULL)
*head = *tail = fi;
else
*tail = (*tail)->next =fi;
}
/**
* Free the memory for all entries in a list of file_info structs.
*/
static void
file_info_list_free(struct file_info *fi)
{
while (fi) {
struct file_info *fl;
fl=fi; fi=fi->next;
file_info_free(fl);
}
}
static void
file_treewalk_feed(const char *dir, int fd_out)
{
int pipefd[2];
pid_t pid;
struct file_info *fi;
struct file_info *symlist = NULL;
struct file_info *symlist_end = NULL;
m_pipe(pipefd);
pid = subproc_fork();
if (pid == 0) {
m_dup2(pipefd[1], 1);
close(pipefd[0]);
close(pipefd[1]);
if (chdir(dir))
ohshite(_("failed to chdir to `%.255s'"), dir);
execlp(FIND, "find", ".", "-path", "./" BUILDCONTROLDIR, "-prune", "-o",
"-print0", NULL);
ohshite(_("unable to execute %s (%s)"), "find", FIND);
}
close(pipefd[1]);
/* We need to reorder the files so we can make sure that symlinks
* will not appear before their target. */
while ((fi = file_info_get(dir, pipefd[0])) != NULL) {
if (S_ISLNK(fi->st.st_mode)) {
file_info_list_append(&symlist, &symlist_end, fi);
} else {
if (fd_write(fd_out, fi->fn, strlen(fi->fn) + 1) < 0)
ohshite(_("failed to write filename to tar pipe (%s)"),
_("data member"));
file_info_free(fi);
}
}
close(pipefd[0]);
subproc_reap(pid, "find", 0);
for (fi = symlist; fi; fi = fi->next)
if (fd_write(fd_out, fi->fn, strlen(fi->fn) + 1) < 0)
ohshite(_("failed to write filename to tar pipe (%s)"), _("data member"));
file_info_list_free(symlist);
}
static const char *const maintainerscripts[] = {
PREINSTFILE,
POSTINSTFILE,
PRERMFILE,
POSTRMFILE,
NULL,
};
/**
* Check control directory and file permissions.
*/
static void
check_file_perms(const char *dir)
{
struct varbuf path = VARBUF_INIT;
const char *const *mscriptp;
struct stat mscriptstab;
varbuf_printf(&path, "%s/%s/", dir, BUILDCONTROLDIR);
if (lstat(path.buf, &mscriptstab))
ohshite(_("unable to stat control directory"));
if (!S_ISDIR(mscriptstab.st_mode))
ohshit(_("control directory is not a directory"));
if ((mscriptstab.st_mode & 07757) != 0755)
ohshit(_("control directory has bad permissions %03lo "
"(must be >=0755 and <=0775)"),
(unsigned long)(mscriptstab.st_mode & 07777));
for (mscriptp = maintainerscripts; *mscriptp; mscriptp++) {
varbuf_reset(&path);
varbuf_printf(&path, "%s/%s/%s", dir, BUILDCONTROLDIR, *mscriptp);
if (!lstat(path.buf, &mscriptstab)) {
if (S_ISLNK(mscriptstab.st_mode))
continue;
if (!S_ISREG(mscriptstab.st_mode))
ohshit(_("maintainer script `%.50s' is not a plain file or symlink"),
*mscriptp);
if ((mscriptstab.st_mode & 07557) != 0555)
ohshit(_("maintainer script `%.50s' has bad permissions %03lo "
"(must be >=0555 and <=0775)"),
*mscriptp, (unsigned long)(mscriptstab.st_mode & 07777));
} else if (errno != ENOENT) {
ohshite(_("maintainer script `%.50s' is not stattable"), *mscriptp);
}
}
varbuf_destroy(&path);
}
/**
* Check if conffiles contains sane information.
*/
static void
check_conffiles(const char *dir)
{
FILE *cf;
struct varbuf controlfile = VARBUF_INIT;
char conffilename[MAXCONFFILENAME + 1];
struct file_info *conffiles_head = NULL;
struct file_info *conffiles_tail = NULL;
varbuf_printf(&controlfile, "%s/%s/%s", dir, BUILDCONTROLDIR, CONFFILESFILE);
cf = fopen(controlfile.buf, "r");
if (cf == NULL) {
if (errno == ENOENT)
return;
ohshite(_("error opening conffiles file"));
}
while (fgets(conffilename, MAXCONFFILENAME + 1, cf)) {
struct stat controlstab;
int n;
n = strlen(conffilename);
if (!n)
ohshite(_("empty string from fgets reading conffiles"));
if (conffilename[n - 1] != '\n')
ohshit(_("conffile name '%s' is too long, or missing final newline"),
conffilename);
conffilename[n - 1] = '\0';
varbuf_reset(&controlfile);
varbuf_printf(&controlfile, "%s/%s", dir, conffilename);
if (lstat(controlfile.buf, &controlstab)) {
if (errno == ENOENT) {
if ((n > 1) && c_isspace(conffilename[n - 2]))
warning(_("conffile filename '%s' contains trailing white spaces"),
conffilename);
ohshit(_("conffile `%.250s' does not appear in package"), conffilename);
} else
ohshite(_("conffile `%.250s' is not stattable"), conffilename);
} else if (!S_ISREG(controlstab.st_mode)) {
warning(_("conffile '%s' is not a plain file"), conffilename);
}
if (file_info_find_name(conffiles_head, conffilename)) {
warning(_("conffile name '%s' is duplicated"), conffilename);
} else {
struct file_info *conffile;
conffile = file_info_new(conffilename);
file_info_list_append(&conffiles_head, &conffiles_tail, conffile);
}
}
file_info_list_free(conffiles_head);
varbuf_destroy(&controlfile);
if (ferror(cf))
ohshite(_("error reading conffiles file"));
fclose(cf);
}
/**
* Perform some sanity checks on the to-be-built package.
*
* @return The pkginfo struct from the parsed control file.
*/
static struct pkginfo *
check_new_pkg(const char *dir)
{
struct pkginfo *pkg;
char *controlfile;
int warns;
/* Start by reading in the control file so we can check its contents. */
m_asprintf(&controlfile, "%s/%s/%s", dir, BUILDCONTROLDIR, CONTROLFILE);
parsedb(controlfile, pdb_parse_binary, &pkg);
if (strspn(pkg->set->name, "abcdefghijklmnopqrstuvwxyz0123456789+-.") !=
strlen(pkg->set->name))
ohshit(_("package name has characters that aren't lowercase alphanums or `-+.'"));
if (pkg->priority == PKG_PRIO_OTHER)
warning(_("'%s' contains user-defined Priority value '%s'"),
controlfile, pkg->otherpriority);
free(controlfile);
check_file_perms(dir);
check_conffiles(dir);
warns = warning_get_count();
if (warns)
warning(P_("ignoring %d warning about the control file(s)",
"ignoring %d warnings about the control file(s)", warns),
warns);
return pkg;
}
/**
* Generate the pathname for the destination binary package.
*
* If the pathname cannot be computed, because the destination is a directory,
* then NULL will be returned.
*
* @param dir The directory from where to build the binary package.
* @param dest The destination name, either a file or directory name.
* @return The pathname for the package being built.
*/
static char *
gen_dest_pathname(const char *dir, const char *dest)
{
if (dest) {
struct stat dest_stab;
if (stat(dest, &dest_stab)) {
if (errno != ENOENT)
ohshite(_("unable to check for existence of archive `%.250s'"), dest);
} else if (S_ISDIR(dest_stab.st_mode)) {
/* Need to compute the destination name from the package control file. */
return NULL;
}
return m_strdup(dest);
} else {
char *pathname;
pathname = m_malloc(strlen(dir) + sizeof(DEBEXT));
strcpy(pathname, dir);
path_trim_slash_slashdot(pathname);
strcat(pathname, DEBEXT);
return pathname;
}
}
/**
* Generate the pathname for the to-be-built package.
*
* @return The pathname for the package being built.
*/
static char *
pkg_get_pathname(const char *dir, struct pkginfo *pkg)
{
char *path;
const char *versionstring, *arch_sep;
versionstring = versiondescribe(&pkg->available.version, vdew_never);
arch_sep = pkg->available.arch->type == DPKG_ARCH_NONE ? "" : "_";
m_asprintf(&path, "%s/%s_%s%s%s%s", dir, pkg->set->name, versionstring,
arch_sep, pkg->available.arch->name, DEBEXT);
return path;
}
/**
* Overly complex function that builds a .deb file.
*/
int
do_build(const char *const *argv)
{
struct compress_params control_compress_params;
struct dpkg_error err;
const char *dir, *dest;
char *debar;
char *tfbuf;
int arfd;
int p1[2], p2[2], gzfd;
pid_t c1, c2;
/* Decode our arguments. */
dir = *argv++;
if (!dir)
badusage(_("--%s needs a <directory> argument"), cipaction->olong);
dest = *argv++;
if (dest && *argv)
badusage(_("--%s takes at most two arguments"), cipaction->olong);
debar = gen_dest_pathname(dir, dest);
/* Perform some sanity checks on the to-be-build package. */
if (nocheckflag) {
if (debar == NULL)
ohshit(_("target is directory - cannot skip control file check"));
warning(_("not checking contents of control area"));
printf(_("dpkg-deb: building an unknown package in '%s'.\n"), debar);
} else {
struct pkginfo *pkg;
pkg = check_new_pkg(dir);
if (debar == NULL)
debar = pkg_get_pathname(dest, pkg);
printf(_("dpkg-deb: building package `%s' in `%s'.\n"),
pkg->set->name, debar);
}
m_output(stdout, _("<standard output>"));
/* Now that we have verified everything its time to actually
* build something. Let's start by making the ar-wrapper. */
arfd = creat(debar, 0644);
if (arfd < 0)
ohshite(_("unable to create `%.255s'"), debar);
/* Fork a tar to package the control-section of the package. */
unsetenv("TAR_OPTIONS");
m_pipe(p1);
c1 = subproc_fork();
if (!c1) {
m_dup2(p1[1],1); close(p1[0]); close(p1[1]);
if (chdir(dir))
ohshite(_("failed to chdir to `%.255s'"), dir);
if (chdir(BUILDCONTROLDIR))
ohshite(_("failed to chdir to `%.255s'"), ".../DEBIAN");
execlp(TAR, "tar", "-cf", "-", "--format=gnu", ".", NULL);
ohshite(_("unable to execute %s (%s)"), "tar -cf", TAR);
}
close(p1[1]);
/* Create a temporary file to store the control data in. Immediately
* unlink our temporary file so others can't mess with it. */
tfbuf = path_make_temp_template("dpkg-deb");
gzfd = mkstemp(tfbuf);
if (gzfd == -1)
ohshite(_("failed to make temporary file (%s)"), _("control member"));
/* Make sure it's gone, the fd will remain until we close it. */
if (unlink(tfbuf))
ohshit(_("failed to unlink temporary file (%s), %s"), _("control member"),
tfbuf);
free(tfbuf);
/* And run the compressor on our control archive. */
if (opt_uniform_compression) {
control_compress_params = compress_params;
} else {
control_compress_params.type = COMPRESSOR_TYPE_GZIP;
control_compress_params.strategy = COMPRESSOR_STRATEGY_NONE;
control_compress_params.level = -1;
}
c2 = subproc_fork();
if (!c2) {
compress_filter(&control_compress_params, p1[0], gzfd, _("compressing control member"));
exit(0);
}
close(p1[0]);
subproc_reap(c2, "gzip -9c", 0);
subproc_reap(c1, "tar -cf", 0);
if (lseek(gzfd, 0, SEEK_SET))
ohshite(_("failed to rewind temporary file (%s)"), _("control member"));
/* We have our first file for the ar-archive. Write a header for it
* to the package and insert it. */
if (deb_format.major == 0) {
struct stat controlstab;
char versionbuf[40];
if (fstat(gzfd, &controlstab))
ohshite(_("failed to stat temporary file (%s)"), _("control member"));
sprintf(versionbuf, "%-8s\n%jd\n", OLDARCHIVEVERSION,
(intmax_t)controlstab.st_size);
if (fd_write(arfd, versionbuf, strlen(versionbuf)) < 0)
ohshite(_("error writing `%s'"), debar);
if (fd_fd_copy(gzfd, arfd, -1, &err) < 0)
ohshit(_("cannot copy '%s' into archive '%s': %s"), _("control member"),
debar, err.str);
} else if (deb_format.major == 2) {
const char deb_magic[] = ARCHIVEVERSION "\n";
char adminmember[16 + 1];
sprintf(adminmember, "%s%s", ADMINMEMBER,
compressor_get_extension(control_compress_params.type));
dpkg_ar_put_magic(debar, arfd);
dpkg_ar_member_put_mem(debar, arfd, DEBMAGIC, deb_magic, strlen(deb_magic));
dpkg_ar_member_put_file(debar, arfd, adminmember, gzfd, -1);
} else {
internerr("unknown deb format version %d.%d", deb_format.major, deb_format.minor);
}
close(gzfd);
/* Control is done, now we need to archive the data. */
if (deb_format.major == 0) {
/* In old format, the data member is just concatenated after the
* control member, so we do not need a temporary file and can use
* the compression file descriptor. */
gzfd = arfd;
} else if (deb_format.major == 2) {
/* Start by creating a new temporary file. Immediately unlink the
* temporary file so others can't mess with it. */
tfbuf = path_make_temp_template("dpkg-deb");
gzfd = mkstemp(tfbuf);
if (gzfd == -1)
ohshite(_("failed to make temporary file (%s)"), _("data member"));
/* Make sure it's gone, the fd will remain until we close it. */
if (unlink(tfbuf))
ohshit(_("failed to unlink temporary file (%s), %s"), _("data member"),
tfbuf);
free(tfbuf);
} else {
internerr("unknown deb format version %d.%d", deb_format.major, deb_format.minor);
}
/* Fork off a tar. We will feed it a list of filenames on stdin later. */
m_pipe(p1);
m_pipe(p2);
c1 = subproc_fork();
if (!c1) {
m_dup2(p1[0],0); close(p1[0]); close(p1[1]);
m_dup2(p2[1],1); close(p2[0]); close(p2[1]);
if (chdir(dir))
ohshite(_("failed to chdir to `%.255s'"), dir);
execlp(TAR, "tar", "-cf", "-", "--format=gnu", "--null", "--no-unquote",
"-T", "-", "--no-recursion", NULL);
ohshite(_("unable to execute %s (%s)"), "tar -cf", TAR);
}
close(p1[0]);
close(p2[1]);
/* Of course we should not forget to compress the archive as well. */
c2 = subproc_fork();
if (!c2) {
close(p1[1]);
compress_filter(&compress_params, p2[0], gzfd, _("compressing data member"));
exit(0);
}
close(p2[0]);
/* All the pipes are set, now lets walk the tree, and start feeding
* filenames to tar. */
file_treewalk_feed(dir, p1[1]);
/* All done, clean up wait for tar and gzip to finish their job. */
close(p1[1]);
subproc_reap(c2, _("<compress> from tar -cf"), 0);
subproc_reap(c1, "tar -cf", 0);
/* Okay, we have data.tar as well now, add it to the ar wrapper. */
if (deb_format.major == 2) {
char datamember[16 + 1];
sprintf(datamember, "%s%s", DATAMEMBER,
compressor_get_extension(compress_params.type));
if (lseek(gzfd, 0, SEEK_SET))
ohshite(_("failed to rewind temporary file (%s)"), _("data member"));
dpkg_ar_member_put_file(debar, arfd, datamember, gzfd, -1);
close(gzfd);
}
if (fsync(arfd))
ohshite(_("unable to sync file '%s'"), debar);
if (close(arfd))
ohshite(_("unable to close file '%s'"), debar);
return 0;
}
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