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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 © 2010 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 <http://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 <errno.h>
- #include <fcntl.h>
- #include <libgen.h>
- #include <string.h>
- #include <ctype.h>
- #include <time.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- #include <dpkg/subproc.h>
- #include <dpkg/buffer.h>
- #include <dpkg/ar.h>
- #include <dpkg/myopt.h>
- #include "dpkg-split.h"
- static char *
- deb_field(const char *filename, const char *field)
- {
- 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(_("failed to exec dpkg-deb to extract field value"));
- }
- close(p[1]);
- /* Parant reads from pipe. */
- varbufreset(&buf);
- fd_vbuf_copy(p[0], &buf, -1, _("dpkg-deb field extraction"));
- varbufaddc(&buf, '\0');
- close(p[0]);
- subproc_wait_check(pid, _("dpkg-deb field 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, size_t partsize,
- size_t maxpartsize, bool msdos)
- {
- int fd_src;
- struct stat st;
- char hash[MD5HASHLEN + 1];
- char *package, *version;
- int nparts, curpart;
- off_t startat;
- char *prefixdir = NULL, *msdos_prefix = NULL;
- struct varbuf file_dst = VARBUF_INIT;
- struct varbuf partmagic = VARBUF_INIT;
- struct varbuf partname = VARBUF_INIT;
- char *partdata;
- 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);
- fd_md5(fd_src, hash, -1, "md5hash");
- lseek(fd_src, 0, SEEK_SET);
- /* FIXME: Use libdpkg-deb. */
- package = deb_field(file_src, "Package");
- version = deb_field(file_src, "Version");
- nparts = (st.st_size + partsize - 1) / partsize;
- setvbuf(stdout, NULL, _IONBF, 0);
- printf("Splitting package %s into %d parts: ", package, nparts);
- if (msdos) {
- char *t;
- t = m_strdup(prefix);
- prefixdir = m_strdup(dirname(t));
- free(t);
- t = m_strdup(prefix);
- msdos_prefix = m_strdup(basename(t));
- free(t);
- prefix = clean_msdos_filename(msdos_prefix);
- }
- partdata = m_malloc(partsize);
- curpart = 1;
- for (startat = 0; startat < st.st_size; startat += partsize) {
- int fd_dst;
- ssize_t partrealsize;
- varbufreset(&file_dst);
- /* Generate output filename. */
- if (msdos) {
- struct varbuf refname = VARBUF_INIT;
- int prefix_max;
- varbufprintf(&refname, "%dof%d", curpart, nparts);
- prefix_max = max(8 - strlen(refname.buf), 0);
- varbufprintf(&file_dst, "%s/%.*s%.8s.deb",
- prefixdir, prefix_max, prefix,
- refname.buf);
- varbuf_destroy(&refname);
- } else {
- varbufprintf(&file_dst, "%s.%dof%d.deb",
- prefix, curpart, nparts);
- }
- /* Read data from the original package. */
- partrealsize = read(fd_src, partdata, partsize);
- if (partrealsize < 0)
- ohshite("mksplit: read");
- if ((size_t)partrealsize > maxpartsize) {
- ohshit("Header is too long, making part too long. "
- "Your package name or version\n"
- "numbers must be extraordinarily long, "
- "or something. Giving up.\n");
- }
- /* Split the data. */
- fd_dst = open(file_dst.buf, O_CREAT | O_WRONLY, 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. */
- varbufprintf(&partmagic, "%s\n%s\n%s\n%s\n%zu\n%zu\n%d/%d\n",
- SPLITVERSION, package, version, hash,
- st.st_size, partsize, curpart, nparts);
- dpkg_ar_member_put_mem(file_dst.buf, fd_dst, PARTMAGIC,
- partmagic.buf, partmagic.used);
- varbufreset(&partmagic);
- /* Write the data part. */
- varbufprintf(&partname, "data.%d", curpart);
- dpkg_ar_member_put_mem(file_dst.buf, fd_dst, partname.buf,
- partdata, (size_t)partrealsize);
- varbufreset(&partname);
- close(fd_dst);
- printf("%d ", curpart);
- curpart++;
- }
- varbuf_destroy(&file_dst);
- varbuf_destroy(&partname);
- varbuf_destroy(&partmagic);
- free(partdata);
- free(prefixdir);
- free(msdos_prefix);
- close(fd_src);
- printf("done\n");
- return 0;
- }
- void do_split(const char *const *argv) {
- const char *sourcefile, *prefix;
- char *palloc;
- int l;
- size_t partsize;
- 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) {
- l= strlen(sourcefile);
- palloc= nfmalloc(l+1);
- strcpy(palloc,sourcefile);
- if (!strcmp(palloc+l-(sizeof(DEBEXT)-1),DEBEXT)) {
- l -= (sizeof(DEBEXT)-1);
- palloc[l] = '\0';
- }
- prefix= palloc;
- }
- partsize = maxpartsize - HEADERALLOWANCE;
- mksplit(sourcefile, prefix, partsize, maxpartsize, msdos);
- exit(0);
- }
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