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/*
* dpkg-split - splitting and joining of multipart *.deb archives
* split.c - splitting archives
*
* Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
* Copyright © 2008-2011 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 <limits.h>
#include <fcntl.h>
#include <libgen.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/path.h>
#include <dpkg/string.h>
#include <dpkg/subproc.h>
#include <dpkg/buffer.h>
#include <dpkg/ar.h>
#include <dpkg/options.h>
#include "dpkg-split.h"
static char *
deb_field(const char *filename, const char *field)
{
struct dpkg_error err;
pid_t pid;
int p[2];
struct varbuf buf = VARBUF_INIT;
char *end;
m_pipe(p);
pid = subproc_fork();
if (pid == 0) {
/* Child writes to pipe. */
m_dup2(p[1], 1);
close(p[0]);
close(p[1]);
execlp(BACKEND, BACKEND, "--field", filename, field, NULL);
ohshite(_("unable to execute %s (%s)"),
_("package field value extraction"), BACKEND);
}
close(p[1]);
/* Parant reads from pipe. */
varbuf_reset(&buf);
if (fd_vbuf_copy(p[0], &buf, -1, &err) < 0)
ohshit(_("cannot extract package field value from '%s': %s"),
filename, err.str);
varbuf_end_str(&buf);
close(p[0]);
subproc_wait_check(pid, _("package field value extraction"), PROCPIPE);
/* Trim down trailing junk. */
for (end = buf.buf + strlen(buf.buf) - 1; end - buf.buf >= 1; end--)
if (isspace(*end))
*end = '\0';
else
break;
return varbuf_detach(&buf);
}
/* Cleanup filename for use in crippled msdos systems. */
static char *
clean_msdos_filename(char *filename)
{
char *d, *s;
for (s = d = filename; *s; d++, s++) {
if (*s == '+')
*d = 'x';
else if (isupper(*s))
*d = tolower(*s);
else if (islower(*s) || isdigit(*s))
*d = *s;
else
s++;
}
return filename;
}
static int
mksplit(const char *file_src, const char *prefix, off_t maxpartsize,
bool msdos)
{
struct dpkg_error err;
int fd_src;
struct stat st;
char hash[MD5HASHLEN + 1];
char *package, *version, *arch;
int nparts, curpart;
off_t partsize;
off_t cur_partsize, last_partsize;
char *prefixdir = NULL, *msdos_prefix = NULL;
struct varbuf file_dst = VARBUF_INIT;
struct varbuf partmagic = VARBUF_INIT;
struct varbuf partname = VARBUF_INIT;
fd_src = open(file_src, O_RDONLY);
if (fd_src < 0)
ohshite(_("unable to open source file `%.250s'"), file_src);
if (fstat(fd_src, &st))
ohshite(_("unable to fstat source file"));
if (!S_ISREG(st.st_mode))
ohshit(_("source file `%.250s' not a plain file"), file_src);
if (fd_md5(fd_src, hash, -1, &err) < 0)
ohshit(_("cannot compute MD5 hash for file '%s': %s"),
file_src, err.str);
lseek(fd_src, 0, SEEK_SET);
/* FIXME: Use libdpkg-deb. */
package = deb_field(file_src, "Package");
version = deb_field(file_src, "Version");
arch = deb_field(file_src, "Architecture");
partsize = maxpartsize - HEADERALLOWANCE;
last_partsize = st.st_size % partsize;
if (last_partsize == 0)
last_partsize = partsize;
nparts = (st.st_size + partsize - 1) / partsize;
printf(P_("Splitting package %s into %d part: ",
"Splitting package %s into %d parts: ", nparts),
package, nparts);
if (msdos) {
char *t;
t = m_strdup(prefix);
prefixdir = m_strdup(dirname(t));
free(t);
msdos_prefix = m_strdup(path_basename(prefix));
prefix = clean_msdos_filename(msdos_prefix);
}
for (curpart = 1; curpart <= nparts; curpart++) {
int fd_dst;
varbuf_reset(&file_dst);
/* Generate output filename. */
if (msdos) {
char *refname;
int prefix_max;
m_asprintf(&refname, "%dof%d", curpart, nparts);
prefix_max = max(8 - strlen(refname), 0);
varbuf_printf(&file_dst, "%s/%.*s%.8s.deb",
prefixdir, prefix_max, prefix, refname);
free(refname);
} else {
varbuf_printf(&file_dst, "%s.%dof%d.deb",
prefix, curpart, nparts);
}
if (curpart == nparts)
cur_partsize = last_partsize;
else
cur_partsize = partsize;
if (cur_partsize > maxpartsize) {
ohshit(_("header is too long, making part too long; "
"the package name or version\n"
"numbers must be extraordinarily long, "
"or something; giving up"));
}
/* Split the data. */
fd_dst = creat(file_dst.buf, 0644);
if (fd_dst < 0)
ohshite(_("unable to open file '%s'"), file_dst.buf);
/* Write the ar header. */
dpkg_ar_put_magic(file_dst.buf, fd_dst);
/* Write the debian-split part. */
varbuf_printf(&partmagic,
"%s\n%s\n%s\n%s\n%jd\n%jd\n%d/%d\n%s\n",
SPLITVERSION, package, version, hash,
(intmax_t)st.st_size, (intmax_t)partsize,
curpart, nparts, arch);
dpkg_ar_member_put_mem(file_dst.buf, fd_dst, PARTMAGIC,
partmagic.buf, partmagic.used);
varbuf_reset(&partmagic);
/* Write the data part. */
varbuf_printf(&partname, "data.%d", curpart);
dpkg_ar_member_put_file(file_dst.buf, fd_dst, partname.buf,
fd_src, cur_partsize);
varbuf_reset(&partname);
close(fd_dst);
printf("%d ", curpart);
}
varbuf_destroy(&file_dst);
varbuf_destroy(&partname);
varbuf_destroy(&partmagic);
free(package);
free(version);
free(arch);
free(prefixdir);
free(msdos_prefix);
close(fd_src);
printf(_("done\n"));
return 0;
}
int
do_split(const char *const *argv)
{
const char *sourcefile, *prefix;
sourcefile = *argv++;
if (!sourcefile)
badusage(_("--split needs a source filename argument"));
prefix = *argv++;
if (prefix && *argv)
badusage(_("--split takes at most a source filename and destination prefix"));
if (!prefix) {
size_t sourcefile_len = strlen(sourcefile);
if (str_match_end(sourcefile, DEBEXT))
sourcefile_len -= strlen(DEBEXT);
prefix = nfstrnsave(sourcefile, sourcefile_len);
}
mksplit(sourcefile, prefix, opt_maxpartsize, opt_msdos);
return 0;
}
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