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/*
* dpkg - main program for package management
* script.c - maintainer script routines
*
* Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
* 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 <assert.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef WITH_SELINUX
#include <selinux/selinux.h>
#endif
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/pkg.h>
#include <dpkg/subproc.h>
#include <dpkg/command.h>
#include <dpkg/triglib.h>
#include "filesdb.h"
#include "infodb.h"
#include "main.h"
void
post_postinst_tasks(struct pkginfo *pkg, enum pkgstatus new_status)
{
if (new_status < PKG_STAT_TRIGGERSAWAITED)
pkg_set_status(pkg, new_status);
else if (pkg->trigaw.head)
pkg_set_status(pkg, PKG_STAT_TRIGGERSAWAITED);
else if (pkg->trigpend_head)
pkg_set_status(pkg, PKG_STAT_TRIGGERSPENDING);
else
pkg_set_status(pkg, PKG_STAT_INSTALLED);
modstatdb_note(pkg);
debug(dbg_triggersdetail, "post_postinst_tasks - trig_incorporate");
trig_incorporate(modstatdb_get_status());
}
static void
post_script_tasks(void)
{
debug(dbg_triggersdetail, "post_script_tasks - ensure_diversions");
ensure_diversions();
debug(dbg_triggersdetail, "post_script_tasks - trig_incorporate");
trig_incorporate(modstatdb_get_status());
}
static void
cu_post_script_tasks(int argc, void **argv)
{
post_script_tasks();
}
static void
setexecute(const char *path, struct stat *stab)
{
if ((stab->st_mode & 0555) == 0555)
return;
if (!chmod(path, 0755))
return;
ohshite(_("unable to set execute permissions on `%.250s'"), path);
}
/**
* Returns the path to the script inside the chroot.
*/
static const char *
maintscript_pre_exec(struct command *cmd)
{
const char *admindir = dpkg_db_get_dir();
size_t instdirl = strlen(instdir);
if (*instdir) {
if (strncmp(admindir, instdir, instdirl) != 0)
ohshit(_("admindir must be inside instdir for dpkg to work properly"));
if (setenv("DPKG_ADMINDIR", admindir + instdirl, 1) < 0)
ohshite(_("unable to setenv for subprocesses"));
if (chroot(instdir))
ohshite(_("failed to chroot to `%.250s'"), instdir);
}
/* Switch to a known good directory to give the maintainer script
* a saner environment, also needed after the chroot(). */
if (chdir("/"))
ohshite(_("failed to chdir to `%.255s'"), "/");
if (debug_has_flag(dbg_scripts)) {
struct varbuf args = VARBUF_INIT;
const char **argv = cmd->argv;
while (*++argv) {
varbuf_add_char(&args, ' ');
varbuf_add_str(&args, *argv);
}
varbuf_end_str(&args);
debug(dbg_scripts, "fork/exec %s (%s )", cmd->filename,
args.buf);
varbuf_destroy(&args);
}
if (!instdirl)
return cmd->filename;
assert(strlen(cmd->filename) >= instdirl);
return cmd->filename + instdirl;
}
/**
* Set a new security execution context for the maintainer script.
*
* Try to create a new execution context based on the current one and the
* specific maintainer script filename. If it's the same as the current
* one, use the given fallback.
*/
static int
maintscript_set_exec_context(struct command *cmd, const char *fallback)
{
int rc = 0;
#ifdef WITH_SELINUX
rc = setexecfilecon(cmd->filename, fallback);
#endif
return rc < 0 ? rc : 0;
}
static int
maintscript_exec(struct pkginfo *pkg, struct pkgbin *pkgbin,
struct command *cmd, struct stat *stab, int warn)
{
pid_t pid;
int rc;
setexecute(cmd->filename, stab);
push_cleanup(cu_post_script_tasks, ehflag_bombout, NULL, 0, 0);
pid = subproc_fork();
if (pid == 0) {
char *pkg_count;
m_asprintf(&pkg_count, "%d", pkgset_installed_instances(pkg->set));
if (setenv("DPKG_MAINTSCRIPT_PACKAGE", pkg->set->name, 1) ||
setenv("DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT", pkg_count, 1) ||
setenv("DPKG_MAINTSCRIPT_ARCH", pkgbin->arch->name, 1) ||
setenv("DPKG_MAINTSCRIPT_NAME", cmd->argv[0], 1) ||
setenv("DPKG_RUNNING_VERSION", PACKAGE_VERSION, 1))
ohshite(_("unable to setenv for maintainer script"));
cmd->filename = cmd->argv[0] = maintscript_pre_exec(cmd);
if (maintscript_set_exec_context(cmd, "dpkg_script_t") < 0)
ohshite(_("cannot set security execution context for "
"maintainer script"));
command_exec(cmd);
}
subproc_signals_ignore(cmd->name);
rc = subproc_reap(pid, cmd->name, warn);
subproc_signals_restore();
pop_cleanup(ehflag_normaltidy);
return rc;
}
static int
vmaintscript_installed(struct pkginfo *pkg, const char *scriptname,
const char *desc, va_list args)
{
struct command cmd;
const char *scriptpath;
struct stat stab;
char buf[100];
scriptpath = pkg_infodb_get_file(pkg, &pkg->installed, scriptname);
sprintf(buf, _("installed %s script"), desc);
command_init(&cmd, scriptpath, buf);
command_add_arg(&cmd, scriptname);
command_add_argv(&cmd, args);
if (stat(scriptpath, &stab)) {
command_destroy(&cmd);
if (errno == ENOENT) {
debug(dbg_scripts,
"vmaintscript_installed nonexistent %s",
scriptname);
return 0;
}
ohshite(_("unable to stat %s `%.250s'"), buf, scriptpath);
}
maintscript_exec(pkg, &pkg->installed, &cmd, &stab, 0);
command_destroy(&cmd);
return 1;
}
/*
* All ...'s in maintscript_* are const char *'s.
*/
int
maintscript_installed(struct pkginfo *pkg, const char *scriptname,
const char *desc, ...)
{
va_list args;
int rc;
va_start(args, desc);
rc = vmaintscript_installed(pkg, scriptname, desc, args);
va_end(args);
if (rc)
post_script_tasks();
return rc;
}
int
maintscript_postinst(struct pkginfo *pkg, ...)
{
va_list args;
int rc;
va_start(args, pkg);
rc = vmaintscript_installed(pkg, POSTINSTFILE, "post-installation", args);
va_end(args);
if (rc)
ensure_diversions();
return rc;
}
int
maintscript_new(struct pkginfo *pkg, const char *scriptname,
const char *desc, const char *cidir, char *cidirrest, ...)
{
struct command cmd;
struct stat stab;
va_list args;
char buf[100];
strcpy(cidirrest, scriptname);
sprintf(buf, _("new %s script"), desc);
va_start(args, cidirrest);
command_init(&cmd, cidir, buf);
command_add_arg(&cmd, scriptname);
command_add_argv(&cmd, args);
va_end(args);
if (stat(cidir, &stab)) {
command_destroy(&cmd);
if (errno == ENOENT) {
debug(dbg_scripts,
"maintscript_new nonexistent %s '%s'",
scriptname, cidir);
return 0;
}
ohshite(_("unable to stat %s `%.250s'"), buf, cidir);
}
maintscript_exec(pkg, &pkg->available, &cmd, &stab, 0);
command_destroy(&cmd);
post_script_tasks();
return 1;
}
int
maintscript_fallback(struct pkginfo *pkg,
const char *scriptname, const char *desc,
const char *cidir, char *cidirrest,
const char *ifok, const char *iffallback)
{
struct command cmd;
const char *oldscriptpath;
struct stat stab;
char buf[100];
oldscriptpath = pkg_infodb_get_file(pkg, &pkg->installed, scriptname);
sprintf(buf, _("old %s script"), desc);
command_init(&cmd, oldscriptpath, buf);
command_add_args(&cmd, scriptname, ifok,
versiondescribe(&pkg->available.version, vdew_nonambig),
NULL);
if (stat(oldscriptpath, &stab)) {
if (errno == ENOENT) {
debug(dbg_scripts,
"maintscript_fallback nonexistent %s '%s'",
scriptname, oldscriptpath);
command_destroy(&cmd);
return 0;
}
warning(_("unable to stat %s '%.250s': %s"),
cmd.name, oldscriptpath, strerror(errno));
} else {
if (!maintscript_exec(pkg, &pkg->installed, &cmd, &stab, SUBPROC_WARN)) {
command_destroy(&cmd);
post_script_tasks();
return 1;
}
}
notice(_("trying script from the new package instead ..."));
strcpy(cidirrest, scriptname);
sprintf(buf, _("new %s script"), desc);
command_destroy(&cmd);
command_init(&cmd, cidir, buf);
command_add_args(&cmd, scriptname, iffallback,
versiondescribe(&pkg->installed.version, vdew_nonambig),
NULL);
if (stat(cidir, &stab)) {
command_destroy(&cmd);
if (errno == ENOENT)
ohshit(_("there is no script in the new version of the package - giving up"));
else
ohshite(_("unable to stat %s `%.250s'"), buf, cidir);
}
maintscript_exec(pkg, &pkg->available, &cmd, &stab, 0);
notice(_("... it looks like that went OK"));
command_destroy(&cmd);
post_script_tasks();
return 1;
}
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