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-rw-r--r--src/main/script.c399
1 files changed, 399 insertions, 0 deletions
diff --git a/src/main/script.c b/src/main/script.c
new file mode 100644
index 0000000..b4f369d
--- /dev/null
+++ b/src/main/script.c
@@ -0,0 +1,399 @@
+/*
+ * dpkg - main program for package management
+ * script.c - maintainer script routines
+ *
+ * Copyright © 1995 Ian Jackson <ijackson@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 <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#ifdef WITH_LIBSELINUX
+#include <selinux/selinux.h>
+#endif
+
+#include <dpkg/i18n.h>
+#include <dpkg/debug.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 <dpkg/db-ctrl.h>
+#include <dpkg/db-fsys.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 *instdir = dpkg_fsys_get_dir();
+ const char *admindir = dpkg_db_get_dir();
+ const char *changedir;
+ size_t instdirlen = strlen(instdir);
+
+ if (instdirlen > 0 && in_force(FORCE_SCRIPT_CHROOTLESS))
+ changedir = instdir;
+ else
+ changedir = "/";
+
+ if (instdirlen > 0 && !in_force(FORCE_SCRIPT_CHROOTLESS)) {
+ int rc;
+
+ if (strncmp(admindir, instdir, instdirlen) != 0)
+ ohshit(_("admindir must be inside instdir for dpkg to work properly"));
+ if (setenv("DPKG_ADMINDIR", admindir + instdirlen, 1) < 0)
+ ohshite(_("unable to setenv for subprocesses"));
+ if (setenv("DPKG_ROOT", "", 1) < 0)
+ ohshite(_("unable to setenv for subprocesses"));
+
+ rc = chroot(instdir);
+ if (rc && in_force(FORCE_NON_ROOT) && errno == EPERM)
+ ohshit(_("not enough privileges to change root "
+ "directory with --force-not-root, consider "
+ "using --force-script-chrootless?"));
+ else if (rc)
+ 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(changedir))
+ ohshite(_("failed to chdir to '%.255s'"), changedir);
+ 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 (instdirlen == 0 || in_force(FORCE_SCRIPT_CHROOTLESS))
+ return cmd->filename;
+
+ if (strlen(cmd->filename) < instdirlen)
+ internerr("maintscript name '%s' length < instdir length %zd",
+ cmd->filename, instdirlen);
+
+ return cmd->filename + instdirlen;
+}
+
+/**
+ * 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)
+{
+#ifdef WITH_LIBSELINUX
+ return setexecfilecon(cmd->filename, "dpkg_script_t");
+#else
+ return 0;
+#endif
+}
+
+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, 0);
+
+ pid = subproc_fork();
+ if (pid == 0) {
+ char *pkg_count;
+ const char *maintscript_debug;
+
+ pkg_count = str_fmt("%d", pkgset_installed_instances(pkg->set));
+
+ maintscript_debug = debug_has_flag(dbg_scripts) ? "1" : "0";
+
+ 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_MAINTSCRIPT_DEBUG", maintscript_debug, 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) < 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;
+
+ scriptpath = pkg_infodb_get_file(pkg, &pkg->installed, scriptname);
+ m_asprintf(&buf, _("installed %s package %s script"),
+ pkg_name(pkg, pnaw_nonambig), 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);
+ free(buf);
+ return 0;
+ }
+ ohshite(_("unable to stat %s '%.250s'"), buf, scriptpath);
+ }
+ maintscript_exec(pkg, &pkg->installed, &cmd, &stab, 0);
+
+ command_destroy(&cmd);
+ free(buf);
+
+ 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;
+
+ strcpy(cidirrest, scriptname);
+ m_asprintf(&buf, _("new %s package %s script"),
+ pkg_name(pkg, pnaw_nonambig), 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);
+ free(buf);
+ return 0;
+ }
+ ohshite(_("unable to stat %s '%.250s'"), buf, cidir);
+ }
+ maintscript_exec(pkg, &pkg->available, &cmd, &stab, 0);
+
+ command_destroy(&cmd);
+ free(buf);
+ 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;
+
+ oldscriptpath = pkg_infodb_get_file(pkg, &pkg->installed, scriptname);
+ m_asprintf(&buf, _("old %s package %s script"),
+ pkg_name(pkg, pnaw_nonambig), 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);
+ free(buf);
+ 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);
+ free(buf);
+ post_script_tasks();
+ return 1;
+ }
+ }
+ notice(_("trying script from the new package instead ..."));
+
+ strcpy(cidirrest, scriptname);
+ m_asprintf(&buf, _("new %s package %s script"),
+ pkg_name(pkg, pnaw_nonambig), desc);
+
+ command_destroy(&cmd);
+ command_init(&cmd, cidir, buf);
+ command_add_args(&cmd, scriptname, iffallback,
+ versiondescribe(&pkg->installed.version, vdew_nonambig),
+ versiondescribe(&pkg->available.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);
+ free(buf);
+ post_script_tasks();
+
+ return 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-22 15:44:40 +0000