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-rw-r--r--ipkg_remove.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/ipkg_remove.c b/ipkg_remove.c
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+++ b/ipkg_remove.c
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+/* ipkg_remove.c - the itsy 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 "ipkg.h"
+#include "ipkg_message.h"
+
+#include <glob.h>
+
+#include "ipkg_remove.h"
+
+#include "file_util.h"
+#include "sprintf_alloc.h"
+#include "str_util.h"
+
+#include "ipkg_cmd.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(ipkg_conf_t *conf, abstract_pkg_t *parent_apkg, pkg_t *pkg, abstract_pkg_t *** pdependents)
+{
+ int nprovides = pkg->provides_count;
+ abstract_pkg_t **provides = pkg->provides;
+ 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){
+ n_installed_dependents++;
+ }
+ }
+
+ }
+ /* if caller requested the set of installed dependents */
+ if (pdependents) {
+ int p = 0;
+ abstract_pkg_t **dependents = (abstract_pkg_t **)malloc((n_installed_dependents+1)*sizeof(abstract_pkg_t *));
+
+ if ( dependents == NULL ){
+ fprintf(stderr,"%s Unable to allocate memory. REPORT THIS BUG IN BUGZILLA PLEASE\n", __FUNCTION__);
+ return -1;
+ }
+
+ *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;
+}
+
+int ipkg_remove_dependent_pkgs (ipkg_conf_t *conf, pkg_t *pkg, abstract_pkg_t **dependents)
+{
+ int i;
+ int a;
+ int count;
+ pkg_vec_t *dependent_pkgs = pkg_vec_alloc();
+ abstract_pkg_t * ab_pkg;
+
+ if((ab_pkg = pkg->parent) == NULL){
+ fprintf(stderr, "%s: unable to get dependent pkgs. pkg %s isn't in hash table\n",
+ __FUNCTION__, 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;
+ 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)
+ return 0;
+
+
+ for (i = 0; i < dependent_pkgs->len; i++) {
+ int err = ipkg_remove_pkg(conf, dependent_pkgs->pkgs[i],0);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+static int user_prefers_removing_dependents(ipkg_conf_t *conf, abstract_pkg_t *abpkg, pkg_t *pkg, abstract_pkg_t **dependents)
+{
+ abstract_pkg_t *dep_ab_pkg;
+ ipkg_message(conf, IPKG_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)
+ ipkg_message(conf, IPKG_ERROR, "\t%s\n", dep_ab_pkg->name);
+ }
+ ipkg_message(conf, IPKG_ERROR, "These might cease to work if package %s is removed.\n\n", pkg->name);
+ ipkg_message(conf, IPKG_ERROR, "");
+ ipkg_message(conf, IPKG_ERROR, "You can force removal of this package with -force-depends.\n");
+ ipkg_message(conf, IPKG_ERROR, "You can force removal of this package and its dependents\n");
+ ipkg_message(conf, IPKG_ERROR, "with -force-removal-of-dependent-packages or -recursive\n");
+ ipkg_message(conf, IPKG_ERROR, "or by setting option force_removal_of_dependent_packages\n");
+ ipkg_message(conf, IPKG_ERROR, "in ipkg.conf.\n");
+ return 0;
+}
+
+int ipkg_remove_pkg(ipkg_conf_t *conf, pkg_t *pkg,int message)
+{
+/* Actually, when "message == 1" I have been called from an upgrade, and not from a normal remove
+ thus I wan't check for essential, as I'm upgrading.
+ I hope it won't break anything :)
+*/
+ int err;
+ abstract_pkg_t *parent_pkg = NULL;
+
+ if (pkg->essential && !message) {
+ if (conf->force_removal_of_essential_packages) {
+ fprintf(stderr, "WARNING: Removing essential package %s under your coercion.\n"
+ "\tIf your system breaks, you get to keep both pieces\n",
+ pkg->name);
+ } else {
+ fprintf(stderr, "ERROR: 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 ipkg to proceed against\n"
+ "\tits will with the option: -force-removal-of-essential-packages\n",
+ pkg->name);
+ return IPKG_PKG_IS_ESSENTIAL;
+ }
+ }
+
+ 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(conf, parent_pkg, pkg, &dependents);
+
+ if (has_installed_dependents) {
+ /*
+ * if this package is depended up 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
+ && !user_prefers_removing_dependents(conf, parent_pkg, pkg, dependents)) {
+ return IPKG_PKG_HAS_DEPENDENTS;
+ }
+
+ /* remove packages depending on this package - Karthik */
+ err = ipkg_remove_dependent_pkgs (conf, pkg, dependents);
+ free(dependents);
+ if (err) return err;
+ }
+ }
+
+ if ( message==0 ){
+ printf("Removing package %s from %s...\n", pkg->name, pkg->dest->name);
+ fflush(stdout);
+ }
+ pkg->state_flag |= SF_FILELIST_CHANGED;
+
+ pkg->state_want = SW_DEINSTALL;
+ ipkg_state_changed++;
+
+ pkg_run_script(conf, pkg, "prerm", "remove");
+
+ /* 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(conf, pkg);
+
+ pkg_run_script(conf, pkg, "postrm", "remove");
+
+ remove_maintainer_scripts_except_postrm(conf, pkg);
+
+ /* Aman Gupta - Since ipkg is made for handheld devices with limited
+ * space, it doesn't make sense to leave extra configurations, files,
+ * and maintainer scripts left around. So, we make remove like purge,
+ * and take out all the crap :) */
+
+ remove_postrm(conf, pkg);
+ pkg->state_status = SS_NOT_INSTALLED;
+
+ if (parent_pkg)
+ parent_pkg->state_status = SS_NOT_INSTALLED;
+
+ return 0;
+}
+
+int ipkg_purge_pkg(ipkg_conf_t *conf, pkg_t *pkg)
+{
+ ipkg_remove_pkg(conf, pkg,0);
+ return 0;
+}
+
+int remove_data_files_and_list(ipkg_conf_t *conf, 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;
+
+ str_list_init(&installed_dirs);
+ installed_files = pkg_get_installed_files(pkg);
+
+ for (iter = installed_files->head; iter; iter = iter->next) {
+ file_name = iter->data;
+
+ if (file_is_dir(file_name)) {
+ str_list_append(&installed_dirs, strdup(file_name));
+ continue;
+ }
+
+ conffile = pkg_get_conffile(pkg, file_name);
+ if (conffile) {
+ /* XXX: QUESTION: Is this right? I figure we only need to
+ save the conffile if it has been modified. Is that what
+ dpkg does? Or does dpkg preserve all conffiles? If so,
+ this seems like a better thing to do to conserve
+ space. */
+ if (conffile_has_been_modified(conf, conffile)) {
+ printf(" not deleting modified conffile %s\n", file_name);
+ fflush(stdout);
+ continue;
+ }
+ }
+
+ ipkg_message(conf, IPKG_INFO, " deleting %s (noaction=%d)\n", file_name, conf->noaction);
+ if (!conf->noaction)
+ unlink(file_name);
+ }
+
+ if (!conf->noaction) {
+ do {
+ removed_a_dir = 0;
+ for (iter = installed_dirs.head; iter; iter = iter->next) {
+ file_name = iter->data;
+
+ if (rmdir(file_name) == 0) {
+ ipkg_message(conf, IPKG_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);
+ /* We have to remove the file list now, so that
+ find_pkg_owning_file does not always just report this package */
+ pkg_remove_installed_files_list(conf, pkg);
+
+ /* Don't print warning for dirs that are provided by other packages */
+ for (iter = installed_dirs.head; iter; iter = iter->next) {
+ file_name = iter->data;
+
+ owner = file_hash_get_file_owner(conf, file_name);
+ if (owner) {
+ free(iter->data);
+ iter->data = NULL;
+ str_list_remove(&installed_dirs, &iter);
+ }
+ }
+
+ /* cleanup */
+ for (iter = installed_dirs.head; iter; iter = iter->next) {
+ free(iter->data);
+ iter->data = NULL;
+ }
+ str_list_deinit(&installed_dirs);
+
+ return 0;
+}
+
+int remove_maintainer_scripts_except_postrm(ipkg_conf_t *conf, pkg_t *pkg)
+{
+ int i, err;
+ char *globpattern;
+ glob_t globbuf;
+
+ if (conf->noaction) return 0;
+
+ sprintf_alloc(&globpattern, "%s/%s.*",
+ pkg->dest->info_dir, pkg->name);
+ err = glob(globpattern, 0, NULL, &globbuf);
+ free(globpattern);
+ if (err) {
+ return 0;
+ }
+
+ for (i = 0; i < globbuf.gl_pathc; i++) {
+ if (str_ends_with(globbuf.gl_pathv[i], ".postrm")) {
+ continue;
+ }
+ ipkg_message(conf, IPKG_INFO, " deleting %s\n", globbuf.gl_pathv[i]);
+ unlink(globbuf.gl_pathv[i]);
+ }
+ globfree(&globbuf);
+
+ return 0;
+}
+
+int remove_postrm(ipkg_conf_t *conf, pkg_t *pkg)
+{
+ char *postrm_file_name;
+
+ if (conf->noaction) return 0;
+
+ sprintf_alloc(&postrm_file_name, "%s/%s.postrm",
+ pkg->dest->info_dir, pkg->name);
+ unlink(postrm_file_name);
+ free(postrm_file_name);
+
+ return 0;
+}