1 files changed, 404 insertions, 0 deletions
diff --git a/src/common/force.c b/src/common/force.c
new file mode 100644
index 0000000..2e1fd78
--- /dev/null
+++ b/src/common/force.c
@@ -0,0 +1,404 @@
+/*
+ * dpkg - main program for package management
+ * force.c - force operation support
+ *
+ * Copyright © 1994,1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright © 2006-2019 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 <errno.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <dpkg/macros.h>
+#include <dpkg/i18n.h>
+#include <dpkg/dpkg.h>
+#include <dpkg/dpkg-db.h>
+#include <dpkg/options.h>
+
+#include "force.h"
+
+static int force_mask;
+static int force_flags;
+
+enum forcetype {
+	FORCETYPE_DISABLED,
+	FORCETYPE_ENABLED,
+	FORCETYPE_DAMAGE,
+};
+
+static const char *
+forcetype_str(enum forcetype type)
+{
+	switch (type) {
+	case FORCETYPE_DISABLED:
+		return "   ";
+	case FORCETYPE_ENABLED:
+		return "[*]";
+	case FORCETYPE_DAMAGE:
+		return "[!]";
+	default:
+		internerr("unknown force type '%d'", type);
+	}
+}
+
+static const struct forceinfo {
+	const char *name;
+	int flag;
+	char type;
+	const char *desc;
+} forceinfos[] = {
+	{
+		"all",
+		FORCE_ALL,
+		FORCETYPE_DAMAGE,
+		N_("Set all force options"),
+	}, {
+		"security-mac",
+		FORCE_SECURITY_MAC,
+		FORCETYPE_ENABLED,
+		N_("Use MAC based security if available"),
+	}, {
+		"downgrade",
+		FORCE_DOWNGRADE,
+		FORCETYPE_ENABLED,
+		N_("Replace a package with a lower version"),
+	}, {
+		"configure-any",
+		FORCE_CONFIGURE_ANY,
+		FORCETYPE_DISABLED,
+		N_("Configure any package which may help this one"),
+	}, {
+		"hold",
+		FORCE_HOLD,
+		FORCETYPE_DISABLED,
+		N_("Install or remove incidental packages even when on hold"),
+	}, {
+		"not-root",
+		FORCE_NON_ROOT,
+		FORCETYPE_DISABLED,
+		N_("Try to (de)install things even when not root"),
+	}, {
+		"bad-path",
+		FORCE_BAD_PATH,
+		FORCETYPE_DISABLED,
+		N_("PATH is missing important programs, problems likely"),
+	}, {
+		"bad-verify",
+		FORCE_BAD_VERIFY,
+		FORCETYPE_DISABLED,
+		N_("Install a package even if it fails authenticity check"),
+	}, {
+		"bad-version",
+		FORCE_BAD_VERSION,
+		FORCETYPE_DISABLED,
+		N_("Process even packages with wrong versions"),
+	}, {
+		"statoverride-add",
+		FORCE_STATOVERRIDE_ADD,
+		FORCETYPE_DISABLED,
+		N_("Overwrite an existing stat override when adding it"),
+	}, {
+		"statoverride-remove",
+		FORCE_STATOVERRIDE_DEL,
+		FORCETYPE_DISABLED,
+		N_("Ignore a missing stat override when removing it"),
+	}, {
+		"overwrite",
+		FORCE_OVERWRITE,
+		FORCETYPE_DISABLED,
+		N_("Overwrite a file from one package with another"),
+	}, {
+		"overwrite-diverted",
+		FORCE_OVERWRITE_DIVERTED,
+		FORCETYPE_DISABLED,
+		N_("Overwrite a diverted file with an undiverted version"),
+	}, {
+		"overwrite-dir",
+		FORCE_OVERWRITE_DIR,
+		FORCETYPE_DAMAGE,
+		N_("Overwrite one package's directory with another's file"),
+	}, {
+		"unsafe-io",
+		FORCE_UNSAFE_IO,
+		FORCETYPE_DAMAGE,
+		N_("Do not perform safe I/O operations when unpacking"),
+	}, {
+		"script-chrootless",
+		FORCE_SCRIPT_CHROOTLESS,
+		FORCETYPE_DAMAGE,
+		N_("Do not chroot into maintainer script environment"),
+	}, {
+		"confnew",
+		FORCE_CONFF_NEW,
+		FORCETYPE_DAMAGE,
+		N_("Always use the new config files, don't prompt"),
+	}, {
+		"confold",
+		FORCE_CONFF_OLD,
+		FORCETYPE_DAMAGE,
+		N_("Always use the old config files, don't prompt"),
+	}, {
+		"confdef",
+		FORCE_CONFF_DEF,
+		FORCETYPE_DAMAGE,
+		N_("Use the default option for new config files if one\n"
+		   "is available, don't prompt. If no default can be found,\n"
+		   "you will be prompted unless one of the confold or\n"
+		   "confnew options is also given"),
+	}, {
+		"confmiss",
+		FORCE_CONFF_MISS,
+		FORCETYPE_DAMAGE,
+		N_("Always install missing config files"),
+	}, {
+		"confask",
+		FORCE_CONFF_ASK,
+		FORCETYPE_DAMAGE,
+		N_("Offer to replace config files with no new versions"),
+	}, {
+		"architecture",
+		FORCE_ARCHITECTURE,
+		FORCETYPE_DAMAGE,
+		N_("Process even packages with wrong or no architecture"),
+	}, {
+		"breaks",
+		FORCE_BREAKS,
+		FORCETYPE_DAMAGE,
+		N_("Install even if it would break another package"),
+	}, {
+		"conflicts",
+		FORCE_CONFLICTS,
+		FORCETYPE_DAMAGE,
+		N_("Allow installation of conflicting packages"),
+	}, {
+		"depends",
+		FORCE_DEPENDS,
+		FORCETYPE_DAMAGE,
+		N_("Turn all dependency problems into warnings"),
+	}, {
+		"depends-version",
+		FORCE_DEPENDS_VERSION,
+		FORCETYPE_DAMAGE,
+		N_("Turn dependency version problems into warnings"),
+	}, {
+		"remove-reinstreq",
+		FORCE_REMOVE_REINSTREQ,
+		FORCETYPE_DAMAGE,
+		N_("Remove packages which require installation"),
+	}, {
+		"remove-protected",
+		FORCE_REMOVE_PROTECTED,
+		FORCETYPE_DAMAGE,
+		N_("Remove a protected package"),
+	}, {
+		"remove-essential",
+		FORCE_REMOVE_ESSENTIAL,
+		FORCETYPE_DAMAGE,
+		N_("Remove an essential package"),
+	}, {
+		NULL
+	}
+};
+
+bool
+in_force(int flags)
+{
+	return (flags & force_flags) == flags;
+}
+
+void
+set_force(int flags)
+{
+	force_flags |= flags;
+}
+
+void
+reset_force(int flags)
+{
+	force_flags &= ~flags;
+}
+
+char *
+get_force_string(void)
+{
+	const struct forceinfo *fip;
+	struct varbuf vb = VARBUF_INIT;
+
+	for (fip = forceinfos; fip->name; fip++) {
+		if ((enum force_flags)fip->flag == FORCE_ALL ||
+		    (fip->flag & force_mask) != fip->flag ||
+		    !in_force(fip->flag))
+			continue;
+
+		if (vb.used)
+			varbuf_add_char(&vb, ',');
+		varbuf_add_str(&vb, fip->name);
+	}
+	varbuf_end_str(&vb);
+
+	return varbuf_detach(&vb);
+}
+
+static inline void
+print_forceinfo_line(int type, const char *name, const char *desc)
+{
+	printf("  %s %-18s %s\n", forcetype_str(type), name, desc);
+}
+
+static void
+print_forceinfo(const struct forceinfo *fi)
+{
+	char *desc, *line;
+
+	desc = m_strdup(gettext(fi->desc));
+
+	line = strtok(desc, "\n");
+	print_forceinfo_line(fi->type, fi->name, line);
+	while ((line = strtok(NULL, "\n")))
+		print_forceinfo_line(FORCETYPE_DISABLED, "", line);
+
+	free(desc);
+}
+
+void
+parse_force(const char *value, bool set)
+{
+	const char *comma;
+	size_t l;
+	const struct forceinfo *fip;
+
+	if (strcmp(value, "help") == 0) {
+		char *force_string = get_force_string();
+
+		printf(_(
+"%s forcing options - control behaviour when problems found:\n"
+"  warn but continue:  --force-<thing>,<thing>,...\n"
+"  stop with error:    --refuse-<thing>,<thing>,... | --no-force-<thing>,...\n"
+" Forcing things:\n"), dpkg_get_progname());
+
+		for (fip = forceinfos; fip->name; fip++)
+			if ((enum force_flags)fip->flag == FORCE_ALL ||
+			    (fip->flag & force_mask) == fip->flag)
+				print_forceinfo(fip);
+
+		printf(_(
+"\n"
+"WARNING - use of options marked [!] can seriously damage your installation.\n"
+"Forcing options marked [*] are enabled by default.\n"));
+		m_output(stdout, _("<standard output>"));
+
+		printf(_(
+"\n"
+"Currently enabled options:\n"
+" %s\n"), force_string);
+
+		free(force_string);
+
+		exit(0);
+	}
+
+	for (;;) {
+		comma = strchrnul(value, ',');
+		l = (size_t)(comma - value);
+		for (fip = forceinfos; fip->name; fip++)
+			if (strncmp(fip->name, value, l) == 0 &&
+			    strlen(fip->name) == l)
+				break;
+
+		if (!fip->name) {
+			badusage(_("unknown force/refuse option '%.*s'"),
+			         (int)min(l, 250), value);
+		} else if (fip->flag) {
+			if (set)
+				set_force(fip->flag);
+			else
+				reset_force(fip->flag);
+		} else {
+			warning(_("obsolete force/refuse option '%s'"),
+			        fip->name);
+		}
+
+		if (*comma == '\0')
+			break;
+		value = ++comma;
+	}
+}
+
+void
+set_force_default(int mask)
+{
+	const char *force_env;
+	const struct forceinfo *fip;
+
+	force_mask = mask;
+
+	/* If we get passed force options from the environment, do not
+	 * initialize from the built-in defaults. */
+	force_env = getenv("DPKG_FORCE");
+	if (force_env != NULL) {
+		if (force_env[0] != '\0')
+			parse_force(force_env, 1);
+		return;
+	}
+
+	for (fip = forceinfos; fip->name; fip++)
+		if (fip->type == FORCETYPE_ENABLED)
+			set_force(fip->flag);
+}
+
+void
+set_force_option(const struct cmdinfo *cip, const char *value)
+{
+	bool set = cip->arg_int;
+
+	parse_force(value, set);
+}
+
+void
+reset_force_option(const struct cmdinfo *cip, const char *value)
+{
+	reset_force(cip->arg_int);
+}
+
+void
+forcibleerr(int forceflag, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	if (in_force(forceflag)) {
+		warning(_("overriding problem because --force enabled:"));
+		warningv(fmt, args);
+	} else {
+		ohshitv(fmt, args);
+	}
+	va_end(args);
+}
+
+int
+forcible_nonroot_error(int rc)
+{
+	if (in_force(FORCE_NON_ROOT) && errno == EPERM)
+		return 0;
+	return rc;
+}