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-rw-r--r--dpkg-split/split.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/dpkg-split/split.c b/dpkg-split/split.c
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index 0000000..e197b22
--- /dev/null
+++ b/dpkg-split/split.c
@@ -0,0 +1,286 @@
+/*
+ * dpkg-split - splitting and joining of multipart *.deb archives
+ * split.c - splitting archives
+ *
+ * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright © 2008-2015 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 <fcntl.h>
+#include <libgen.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.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/parsedump.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"
+
+/**
+ * Parse the control file from a .deb package into a struct pkginfo.
+ */
+static struct pkginfo *
+deb_parse_control(const char *filename)
+{
+ struct parsedb_state *ps;
+ struct pkginfo *pkg;
+ pid_t pid;
+ int p[2];
+
+ 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, "--info", filename, "control", NULL);
+ ohshite(_("unable to execute %s (%s)"),
+ _("package field value extraction"), BACKEND);
+ }
+ close(p[1]);
+
+ /* Parent reads from pipe. */
+ ps = parsedb_new(_("<dpkg-deb --info pipe>"), p[0], pdb_parse_binary);
+ parsedb_load(ps);
+ parsedb_parse(ps, &pkg);
+ parsedb_close(ps);
+
+ close(p[0]);
+
+ subproc_reap(pid, _("package field value extraction"), SUBPROC_NOPIPE);
+
+ return pkg;
+}
+
+static time_t
+parse_timestamp(const char *value)
+{
+ time_t timestamp;
+ char *end;
+
+ errno = 0;
+ timestamp = strtol(value, &end, 10);
+ if (value == end || *end || errno != 0)
+ ohshite(_("unable to parse timestamp '%.255s'"), value);
+
+ return timestamp;
+}
+
+/* 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 (c_isupper(*s))
+ *d = c_tolower(*s);
+ else if (c_islower(*s) || c_isdigit(*s))
+ *d = *s;
+ else
+ s++;
+ }
+
+ return filename;
+}
+
+static int
+mksplit(const char *file_src, const char *prefix, off_t maxpartsize,
+ bool msdos)
+{
+ struct pkginfo *pkg;
+ struct dpkg_error err;
+ int fd_src;
+ struct stat st;
+ time_t timestamp;
+ const char *timestamp_str;
+ const char *version;
+ char hash[MD5HASHLEN + 1];
+ 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);
+
+ pkg = deb_parse_control(file_src);
+ version = versiondescribe(&pkg->available.version, vdew_nonambig);
+
+ timestamp_str = getenv("SOURCE_DATE_EPOCH");
+ if (timestamp_str)
+ timestamp = parse_timestamp(timestamp_str);
+ else
+ timestamp = time(NULL);
+
+ 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),
+ pkg->set->name, 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++) {
+ struct dpkg_ar *ar;
+
+ varbuf_reset(&file_dst);
+ /* Generate output filename. */
+ if (msdos) {
+ char *refname;
+ int prefix_max;
+
+ refname = str_fmt("%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. */
+ ar = dpkg_ar_create(file_dst.buf, 0644);
+ dpkg_ar_set_mtime(ar, timestamp);
+
+ /* Write the ar header. */
+ dpkg_ar_put_magic(ar);
+
+ /* 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, pkg->set->name, version, hash,
+ (intmax_t)st.st_size, (intmax_t)partsize,
+ curpart, nparts, pkg->available.arch->name);
+ dpkg_ar_member_put_mem(ar, PARTMAGIC,
+ partmagic.buf, partmagic.used);
+ varbuf_reset(&partmagic);
+
+ /* Write the data part. */
+ varbuf_printf(&partname, "data.%d", curpart);
+ dpkg_ar_member_put_file(ar, partname.buf,
+ fd_src, cur_partsize);
+ varbuf_reset(&partname);
+
+ dpkg_ar_close(ar);
+
+ printf("%d ", curpart);
+ }
+
+ varbuf_destroy(&file_dst);
+ varbuf_destroy(&partname);
+ varbuf_destroy(&partmagic);
+
+ 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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