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-rw-r--r--src/libopkg/.svn/text-base/opkg_remove.c.svn-base450
1 files changed, 450 insertions, 0 deletions
diff --git a/src/libopkg/.svn/text-base/opkg_remove.c.svn-base b/src/libopkg/.svn/text-base/opkg_remove.c.svn-base
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+/* opkg_remove.c - the opkg package management system
+
+ Carl D. Worth
+
+ Copyright (C) 2001 University of Southern California
+
+ This program 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, or (at
+ your option) any later version.
+
+ This program 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.
+*/
+
+#include <stdio.h>
+#include <glob.h>
+#include <unistd.h>
+
+#include "opkg_message.h"
+#include "opkg_remove.h"
+#include "opkg_cmd.h"
+#include "file_util.h"
+#include "sprintf_alloc.h"
+#include "libbb/libbb.h"
+
+/*
+ * Returns number of the number of packages depending on the packages provided by this package.
+ * Every package implicitly provides itself.
+ */
+int
+pkg_has_installed_dependents(pkg_t *pkg, abstract_pkg_t *** pdependents)
+{
+ int nprovides = pkg->provides_count;
+ abstract_pkg_t **provides = pkg->provides;
+ unsigned int n_installed_dependents = 0;
+ int i;
+ for (i = 0; i < nprovides; i++) {
+ abstract_pkg_t *providee = provides[i];
+ abstract_pkg_t **dependers = providee->depended_upon_by;
+ abstract_pkg_t *dep_ab_pkg;
+ if (dependers == NULL)
+ continue;
+ while ((dep_ab_pkg = *dependers++) != NULL) {
+ if (dep_ab_pkg->state_status == SS_INSTALLED || dep_ab_pkg->state_status == SS_UNPACKED){
+ n_installed_dependents++;
+ }
+ }
+
+ }
+ /* if caller requested the set of installed dependents */
+ if (pdependents) {
+ int p = 0;
+ abstract_pkg_t **dependents = xcalloc((n_installed_dependents+1), sizeof(abstract_pkg_t *));
+
+ *pdependents = dependents;
+ for (i = 0; i < nprovides; i++) {
+ abstract_pkg_t *providee = provides[i];
+ abstract_pkg_t **dependers = providee->depended_upon_by;
+ abstract_pkg_t *dep_ab_pkg;
+ if (dependers == NULL)
+ continue;
+ while ((dep_ab_pkg = *dependers++) != NULL) {
+ if (dep_ab_pkg->state_status == SS_INSTALLED && !(dep_ab_pkg->state_flag & SF_MARKED)) {
+ dependents[p++] = dep_ab_pkg;
+ dep_ab_pkg->state_flag |= SF_MARKED;
+ }
+ }
+ }
+ dependents[p] = NULL;
+ /* now clear the marks */
+ for (i = 0; i < p; i++) {
+ abstract_pkg_t *dep_ab_pkg = dependents[i];
+ dep_ab_pkg->state_flag &= ~SF_MARKED;
+ }
+ }
+ return n_installed_dependents;
+}
+
+static int
+opkg_remove_dependent_pkgs(pkg_t *pkg, abstract_pkg_t **dependents)
+{
+ int i;
+ int a;
+ int count;
+ pkg_vec_t *dependent_pkgs;
+ abstract_pkg_t * ab_pkg;
+
+ if((ab_pkg = pkg->parent) == NULL){
+ opkg_msg(ERROR, "Internal error: pkg %s isn't in hash table\n",
+ pkg->name);
+ return 0;
+ }
+
+ if (dependents == NULL)
+ return 0;
+
+ // here i am using the dependencies_checked
+ if (ab_pkg->dependencies_checked == 2) // variable to make out whether this package
+ return 0; // has already been encountered in the process
+ // of marking packages for removal - Karthik
+ ab_pkg->dependencies_checked = 2;
+
+ i = 0;
+ count = 1;
+ dependent_pkgs = pkg_vec_alloc();
+
+ while (dependents [i] != NULL) {
+ abstract_pkg_t *dep_ab_pkg = dependents[i];
+
+ if (dep_ab_pkg->dependencies_checked == 2){
+ i++;
+ continue;
+ }
+ if (dep_ab_pkg->state_status == SS_INSTALLED) {
+ for (a = 0; a < dep_ab_pkg->pkgs->len; a++) {
+ pkg_t *dep_pkg = dep_ab_pkg->pkgs->pkgs[a];
+ if (dep_pkg->state_status == SS_INSTALLED) {
+ pkg_vec_insert(dependent_pkgs, dep_pkg);
+ count++;
+ }
+ }
+ }
+ i++;
+ /* 1 - to keep track of visited ab_pkgs when checking for possiblility of a broken removal of pkgs.
+ * 2 - to keep track of pkgs whose deps have been checked alrdy - Karthik */
+ }
+
+ if (count == 1) {
+ pkg_vec_free(dependent_pkgs);
+ return 0;
+ }
+
+
+ int err=0;
+ for (i = 0; i < dependent_pkgs->len; i++) {
+ err = opkg_remove_pkg(dependent_pkgs->pkgs[i],0);
+ if (err)
+ break;
+ }
+ pkg_vec_free(dependent_pkgs);
+ return err;
+}
+
+static void
+print_dependents_warning(pkg_t *pkg, abstract_pkg_t **dependents)
+{
+ abstract_pkg_t *dep_ab_pkg;
+ opkg_msg(ERROR, "Package %s is depended upon by packages:\n", pkg->name);
+ while ((dep_ab_pkg = *dependents++) != NULL) {
+ if (dep_ab_pkg->state_status == SS_INSTALLED)
+ opkg_msg(ERROR, "\t%s\n", dep_ab_pkg->name);
+ }
+ opkg_msg(ERROR, "These might cease to work if package %s is removed.\n\n",
+ pkg->name);
+ opkg_msg(ERROR, "Force removal of this package with --force-depends.\n");
+ opkg_msg(ERROR, "Force removal of this package and its dependents\n");
+ opkg_msg(ERROR, "with --force-removal-of-dependent-packages.\n");
+}
+
+/*
+ * Find and remove packages that were autoinstalled and are orphaned
+ * by the removal of pkg.
+ */
+static int
+remove_autoinstalled(pkg_t *pkg)
+{
+ int i, j;
+ int err = 0;
+ int n_deps;
+ pkg_t *p;
+ struct compound_depend *cdep;
+ abstract_pkg_t **dependents;
+
+ int count = pkg->pre_depends_count +
+ pkg->depends_count +
+ pkg->recommends_count +
+ pkg->suggests_count;
+
+ for (i=0; i<count; i++) {
+ cdep = &pkg->depends[i];
+ if (cdep->type != PREDEPEND
+ && cdep->type != DEPEND
+ && cdep->type != RECOMMEND)
+ continue;
+ for (j=0; j<cdep->possibility_count; j++) {
+ p = pkg_hash_fetch_installed_by_name(
+ cdep->possibilities[j]->pkg->name);
+
+ /* If the package is not installed, this could have
+ * been a circular dependency and the package has
+ * already been removed.
+ */
+ if (!p)
+ return -1;
+
+ if (!p->auto_installed)
+ continue;
+
+ n_deps = pkg_has_installed_dependents(p, &dependents);
+ if (n_deps == 0) {
+ opkg_msg(NOTICE, "%s was autoinstalled and is "
+ "now orphaned, removing.\n",
+ p->name);
+ if (opkg_remove_pkg(p, 0) != 0) {
+ err = -1;
+ }
+ } else
+ opkg_msg(INFO, "%s was autoinstalled and is "
+ "still required by %d "
+ "installed packages.\n",
+ p->name, n_deps);
+
+ if (dependents)
+ free(dependents);
+ }
+ }
+
+ return err;
+}
+
+int
+opkg_remove_pkg(pkg_t *pkg, int from_upgrade)
+{
+ int err;
+ abstract_pkg_t *parent_pkg = NULL;
+
+/*
+ * If called from an upgrade and not from a normal remove,
+ * ignore the essential flag.
+ */
+ if (pkg->essential && !from_upgrade) {
+ if (conf->force_removal_of_essential_packages) {
+ opkg_msg(NOTICE,
+ "Removing essential package %s under your coercion.\n"
+ "\tIf your system breaks, you get to keep both pieces\n",
+ pkg->name);
+ } else {
+ opkg_msg(NOTICE, "Refusing to remove essential package %s.\n"
+ "\tRemoving an essential package may lead to an unusable system, but if\n"
+ "\tyou enjoy that kind of pain, you can force opkg to proceed against\n"
+ "\tits will with the option: --force-removal-of-essential-packages\n",
+ pkg->name);
+ return -1;
+ }
+ }
+
+ if ((parent_pkg = pkg->parent) == NULL)
+ return 0;
+
+ /* only attempt to remove dependent installed packages if
+ * force_depends is not specified or the package is being
+ * replaced.
+ */
+ if (!conf->force_depends
+ && !(pkg->state_flag & SF_REPLACE)) {
+ abstract_pkg_t **dependents;
+ int has_installed_dependents =
+ pkg_has_installed_dependents(pkg, &dependents);
+
+ if (has_installed_dependents) {
+ /*
+ * if this package is depended upon by others, then either we should
+ * not remove it or we should remove it and all of its dependents
+ */
+
+ if (!conf->force_removal_of_dependent_packages) {
+ print_dependents_warning(pkg, dependents);
+ free(dependents);
+ return -1;
+ }
+
+ /* remove packages depending on this package - Karthik */
+ err = opkg_remove_dependent_pkgs(pkg, dependents);
+ if (err) {
+ free(dependents);
+ return err;
+ }
+ }
+ if (dependents)
+ free(dependents);
+ }
+
+ if (from_upgrade == 0) {
+ opkg_msg(NOTICE, "Removing package %s from %s...\n",
+ pkg->name, pkg->dest->name);
+ }
+ pkg->state_flag |= SF_FILELIST_CHANGED;
+
+ pkg->state_want = SW_DEINSTALL;
+ opkg_state_changed++;
+
+ if (pkg_run_script(pkg, "prerm", "remove") != 0) {
+ if (!conf->force_remove) {
+ opkg_msg(ERROR, "not removing package \"%s\", "
+ "prerm script failed\n", pkg->name);
+ opkg_msg(NOTICE, "You can force removal of packages with failed "
+ "prerm scripts with the option: \n"
+ "\t--force-remove\n");
+ return -1;
+ }
+ }
+
+ /* DPKG_INCOMPATIBILITY: dpkg is slightly different here. It
+ maintains an empty filelist rather than deleting it. That seems
+ like a big pain, and I don't see that that should make a big
+ difference, but for anyone who wants tighter compatibility,
+ feel free to fix this. */
+ remove_data_files_and_list(pkg);
+
+ err = pkg_run_script(pkg, "postrm", "remove");
+
+ remove_maintainer_scripts(pkg);
+ pkg->state_status = SS_NOT_INSTALLED;
+
+ if (parent_pkg)
+ parent_pkg->state_status = SS_NOT_INSTALLED;
+
+ /* remove autoinstalled packages that are orphaned by the removal of this one */
+ if (conf->autoremove) {
+ if (remove_autoinstalled(pkg) != 0) {
+ err = -1;
+ }
+ }
+ return err;
+}
+
+void
+remove_data_files_and_list(pkg_t *pkg)
+{
+ str_list_t installed_dirs;
+ str_list_t *installed_files;
+ str_list_elt_t *iter;
+ char *file_name;
+ conffile_t *conffile;
+ int removed_a_dir;
+ pkg_t *owner;
+ int rootdirlen = 0;
+
+ installed_files = pkg_get_installed_files(pkg);
+ if (installed_files == NULL) {
+ opkg_msg(ERROR, "Failed to determine installed "
+ "files for %s. None removed.\n", pkg->name);
+ return;
+ }
+
+ str_list_init(&installed_dirs);
+
+ /* don't include trailing slash */
+ if (conf->offline_root)
+ rootdirlen = strlen(conf->offline_root);
+
+ for (iter = str_list_first(installed_files); iter; iter = str_list_next(installed_files, iter)) {
+ file_name = (char *)iter->data;
+
+ owner = file_hash_get_file_owner(file_name);
+ if (owner != pkg)
+ /* File may have been claimed by another package. */
+ continue;
+
+ if (file_is_dir(file_name)) {
+ str_list_append(&installed_dirs, file_name);
+ continue;
+ }
+
+ conffile = pkg_get_conffile(pkg, file_name+rootdirlen);
+ if (conffile) {
+ if (conffile_has_been_modified(conffile)) {
+ opkg_msg(NOTICE, "Not deleting modified conffile %s.\n",
+ file_name);
+ continue;
+ }
+ }
+
+ if (!conf->noaction) {
+ opkg_msg(INFO, "Deleting %s.\n", file_name);
+ unlink(file_name);
+ } else
+ opkg_msg(INFO, "Not deleting %s. (noaction)\n",
+ file_name);
+
+ file_hash_remove(file_name);
+ }
+
+ /* Remove empty directories */
+ if (!conf->noaction) {
+ do {
+ removed_a_dir = 0;
+ for (iter = str_list_first(&installed_dirs); iter; iter = str_list_next(&installed_dirs, iter)) {
+ file_name = (char *)iter->data;
+
+ if (rmdir(file_name) == 0) {
+ opkg_msg(INFO, "Deleting %s.\n", file_name);
+ removed_a_dir = 1;
+ str_list_remove(&installed_dirs, &iter);
+ }
+ }
+ } while (removed_a_dir);
+ }
+
+ pkg_free_installed_files(pkg);
+ pkg_remove_installed_files_list(pkg);
+
+ /* Don't print warning for dirs that are provided by other packages */
+ for (iter = str_list_first(&installed_dirs); iter; iter = str_list_next(&installed_dirs, iter)) {
+ file_name = (char *)iter->data;
+
+ owner = file_hash_get_file_owner(file_name);
+ if (owner) {
+ free(iter->data);
+ iter->data = NULL;
+ str_list_remove(&installed_dirs, &iter);
+ }
+ }
+
+ /* cleanup */
+ while (!void_list_empty(&installed_dirs)) {
+ iter = str_list_pop(&installed_dirs);
+ free(iter->data);
+ free(iter);
+ }
+ str_list_deinit(&installed_dirs);
+}
+
+void
+remove_maintainer_scripts(pkg_t *pkg)
+{
+ int i, err;
+ char *globpattern;
+ glob_t globbuf;
+
+ if (conf->noaction)
+ return;
+
+ sprintf_alloc(&globpattern, "%s/%s.*",
+ pkg->dest->info_dir, pkg->name);
+
+ err = glob(globpattern, 0, NULL, &globbuf);
+ free(globpattern);
+ if (err)
+ return;
+
+ for (i = 0; i < globbuf.gl_pathc; i++) {
+ opkg_msg(INFO, "Deleting %s.\n", globbuf.gl_pathv[i]);
+ unlink(globbuf.gl_pathv[i]);
+ }
+ globfree(&globbuf);
+}