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authorJudd Vinet <judd@archlinux.org>2005-03-15 01:51:43 +0000
committerJudd Vinet <judd@archlinux.org>2005-03-15 01:51:43 +0000
commitd04baabafa2ebbad92741d1f87e6ff32999f894a (patch)
tree5a2280176812b80c28ca77bfa8e0655c16f4db7e /lib/libalpm/deps.c
downloadpacman-d04baabafa2ebbad92741d1f87e6ff32999f894a.tar.xz
Initial revision
Diffstat (limited to 'lib/libalpm/deps.c')
-rw-r--r--lib/libalpm/deps.c685
1 files changed, 685 insertions, 0 deletions
diff --git a/lib/libalpm/deps.c b/lib/libalpm/deps.c
new file mode 100644
index 00000000..d8b79974
--- /dev/null
+++ b/lib/libalpm/deps.c
@@ -0,0 +1,685 @@
+/*
+ * deps.c
+ *
+ * Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
+ *
+ * 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 of the License, 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+/* pacman */
+#include "util.h"
+#include "log.h"
+#include "list.h"
+#include "package.h"
+#include "db.h"
+#include "cache.h"
+#include "provide.h"
+#include "deps.h"
+#include "rpmvercmp.h"
+
+/* Re-order a list of target packages with respect to their dependencies.
+ *
+ * Example:
+ * A depends on C
+ * B depends on A
+ * Target order is A,B,C,D
+ *
+ * Should be re-ordered to C,A,B,D
+ *
+ * This function returns the new PMList* target list.
+ *
+ */
+PMList *sortbydeps(PMList *targets)
+{
+ PMList *newtargs = NULL;
+ PMList *i, *j, *k;
+ int change = 1;
+ int numscans = 0;
+ int numtargs = 0;
+ int clean = 0;
+
+ if(targets == NULL) {
+ return(NULL);
+ }
+
+ /* count the number of targets */
+ numtargs = pm_list_count(targets);
+
+ while(change) {
+ change = 0;
+ if(numscans > numtargs) {
+ _alpm_log(PM_LOG_FLOW2, "warning: possible dependency cycle detected\n");
+ change = 0;
+ continue;
+ }
+ newtargs = NULL;
+ numscans++;
+ /* run thru targets, moving up packages as necessary */
+ for(i = targets; i; i = i->next) {
+ pmpkg_t *p = (pmpkg_t*)i->data;
+ for(j = p->depends; j; j = j->next) {
+ pmdepend_t dep;
+ int found = 0;
+ pmpkg_t *q = NULL;
+
+ splitdep(j->data, &dep);
+ /* look for dep.name -- if it's farther down in the list, then
+ * move it up above p
+ */
+ for(k = i->next; k && !found; k = k->next) {
+ q = (pmpkg_t*)k->data;
+ if(!strcmp(dep.name, q->name)) {
+ found = 1;
+ }
+ }
+ if(found) {
+ if(!pkg_isin(q, newtargs)) {
+ change = 1;
+ newtargs = pm_list_add(newtargs, q);
+ }
+ }
+ }
+ if(!pkg_isin(p, newtargs)) {
+ newtargs = pm_list_add(newtargs, p);
+ }
+ }
+ if(clean && change) {
+ /* free up targets -- it's local now */
+ for(i = targets; i; i = i->next) {
+ i->data = NULL;
+ }
+ pm_list_free(targets);
+ }
+ targets = newtargs;
+ clean = 1;
+ }
+ return(targets);
+}
+
+/* Returns a PMList* of missing_t pointers.
+ *
+ * conflicts are always name only, but dependencies can include versions
+ * with depmod operators.
+ *
+ */
+PMList *checkdeps(pmdb_t *db, unsigned short op, PMList *packages)
+{
+ pmpkg_t *info = NULL;
+ pmdepend_t depend;
+ PMList *i, *j, *k;
+ int cmp;
+ int found = 0;
+ PMList *baddeps = NULL;
+ pmdepmissing_t *miss = NULL;
+
+ if(db == NULL) {
+ return(NULL);
+ }
+
+ if(op == PM_TRANS_TYPE_UPGRADE) {
+ /* PM_TRANS_TYPE_UPGRADE handles the backwards dependencies, ie, the packages
+ * listed in the requiredby field.
+ */
+ for(i = packages; i; i = i->next) {
+ pmpkg_t *tp, *oldpkg;
+ if(i->data == NULL) {
+ continue;
+ }
+ tp = (pmpkg_t *)i->data;
+
+ if((oldpkg = db_scan(db, tp->name, INFRQ_DESC | INFRQ_DEPENDS)) == NULL) {
+ continue;
+ }
+ for(j = oldpkg->requiredby; j; j = j->next) {
+ char *ver;
+ pmpkg_t *p;
+ found = 0;
+ if((p = db_scan(db, j->data, INFRQ_DESC | INFRQ_DEPENDS)) == NULL) {
+ /* hmmm... package isn't installed.. */
+ continue;
+ }
+ if(pkg_isin(p, packages)) {
+ /* this package is also in the upgrade list, so don't worry about it */
+ continue;
+ }
+ for(k = p->depends; k && !found; k = k->next) {
+ /* find the dependency info in p->depends */
+ splitdep(k->data, &depend);
+ if(!strcmp(depend.name, oldpkg->name)) {
+ found = 1;
+ }
+ }
+ if(found == 0) {
+ PMList *lp;
+ /* look for packages that list depend.name as a "provide" */
+ PMList *provides = _alpm_db_whatprovides(db, depend.name);
+ if(provides == NULL) {
+ /* not found */
+ continue;
+ }
+ /* we found an installed package that provides depend.name */
+ for(lp = provides; lp; lp = lp->next) {
+ lp->data = NULL;
+ }
+ pm_list_free(provides);
+ }
+ found = 0;
+ if(depend.mod == PM_DEP_ANY) {
+ found = 1;
+ } else {
+ /* note that we use the version from the NEW package in the check */
+ ver = strdup(tp->version);
+ if(!index(depend.version,'-')) {
+ char *ptr;
+ for(ptr = ver; *ptr != '-'; ptr++);
+ *ptr = '\0';
+ }
+ cmp = rpmvercmp(ver, depend.version);
+ switch(depend.mod) {
+ case PM_DEP_EQ: found = (cmp == 0); break;
+ case PM_DEP_GE: found = (cmp >= 0); break;
+ case PM_DEP_LE: found = (cmp <= 0); break;
+ }
+ FREE(ver);
+ }
+ if(!found) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_REQUIRED;
+ miss->depend.mod = depend.mod;
+ strncpy(miss->target, p->name, 256);
+ strncpy(miss->depend.name, depend.name, 256);
+ strncpy(miss->depend.version, depend.version, 64);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ pkg_free(oldpkg);
+ }
+ }
+ if(op == PM_TRANS_TYPE_ADD || op == PM_TRANS_TYPE_UPGRADE) {
+ for(i = packages; i; i = i->next) {
+ pmpkg_t *tp = i->data;
+ if(tp == NULL) {
+ continue;
+ }
+
+ /* CONFLICTS */
+ for(j = tp->conflicts; j; j = j->next) {
+ /* check targets against database */
+ for(k = db_get_pkgcache(db); k; k = k->next) {
+ pmpkg_t *dp = (pmpkg_t *)k->data;
+ if(!strcmp(j->data, dp->name)) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_CONFLICT;
+ miss->depend.mod = PM_DEP_ANY;
+ miss->depend.version[0] = '\0';
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, dp->name, 256);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ /* check targets against targets */
+ for(k = packages; k; k = k->next) {
+ pmpkg_t *a = (pmpkg_t *)k->data;
+ if(!strcmp(a->name, (char *)j->data)) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_CONFLICT;
+ miss->depend.mod = PM_DEP_ANY;
+ miss->depend.version[0] = '\0';
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, a->name, 256);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ }
+ /* check database against targets */
+ for(k = db_get_pkgcache(db); k; k = k->next) {
+ info = k->data;
+ for(j = info->conflicts; j; j = j->next) {
+ if(!strcmp((char *)j->data, tp->name)) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_CONFLICT;
+ miss->depend.mod = PM_DEP_ANY;
+ miss->depend.version[0] = '\0';
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, info->name, 256);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ }
+
+ /* PROVIDES -- check to see if another package already provides what
+ * we offer
+ */
+ /* XXX: disabled -- we allow multiple packages to provide the same thing.
+ * list packages in conflicts if they really do conflict.
+ for(j = tp->provides; j; j = j->next) {
+ PMList *provs = whatprovides(db, j->data);
+ for(k = provs; k; k = k->next) {
+ if(!strcmp(tp->name, k->data->name)) {
+ // this is the same package -- skip it
+ continue;
+ }
+ // we treat this just like a conflict
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = CONFLICT;
+ miss->depend.mod = PM_DEP_ANY;
+ miss->depend.version[0] = '\0';
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, k->data, 256);
+ if(!pm_list_is_in(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ k->data = NULL;
+ }
+ pm_list_free(provs);
+ }*/
+
+ /* DEPENDENCIES -- look for unsatisfied dependencies */
+ for(j = tp->depends; j; j = j->next) {
+ /* split into name/version pairs */
+ splitdep((char *)j->data, &depend);
+ found = 0;
+ /* check database for literal packages */
+ for(k = db_get_pkgcache(db); k && !found; k = k->next) {
+ pmpkg_t *p = (pmpkg_t *)k->data;
+ if(!strcmp(p->name, depend.name)) {
+ if(depend.mod == PM_DEP_ANY) {
+ /* accept any version */
+ found = 1;
+ } else {
+ char *ver = strdup(p->version);
+ /* check for a release in depend.version. if it's
+ * missing remove it from p->version as well.
+ */
+ if(!index(depend.version,'-')) {
+ char *ptr;
+ for(ptr = ver; *ptr != '-'; ptr++);
+ *ptr = '\0';
+ }
+ cmp = rpmvercmp(ver, depend.version);
+ switch(depend.mod) {
+ case PM_DEP_EQ: found = (cmp == 0); break;
+ case PM_DEP_GE: found = (cmp >= 0); break;
+ case PM_DEP_LE: found = (cmp <= 0); break;
+ }
+ FREE(ver);
+ }
+ }
+ }
+ /* check other targets */
+ for(k = packages; k && !found; k = k->next) {
+ pmpkg_t *p = (pmpkg_t *)k->data;
+ /* see if the package names match OR if p provides depend.name */
+ if(!strcmp(p->name, depend.name) || pm_list_is_strin(depend.name, p->provides)) {
+ if(depend.mod == PM_DEP_ANY) {
+ /* accept any version */
+ found = 1;
+ } else {
+ char *ver = strdup(p->version);
+ /* check for a release in depend.version. if it's
+ * missing remove it from p->version as well.
+ */
+ if(!index(depend.version,'-')) {
+ char *ptr;
+ for(ptr = ver; *ptr != '-'; ptr++);
+ *ptr = '\0';
+ }
+ cmp = rpmvercmp(ver, depend.version);
+ switch(depend.mod) {
+ case PM_DEP_EQ: found = (cmp == 0); break;
+ case PM_DEP_GE: found = (cmp >= 0); break;
+ case PM_DEP_LE: found = (cmp <= 0); break;
+ }
+ FREE(ver);
+ }
+ }
+ }
+ /* check database for provides matches */
+ if(!found){
+ PMList *lp;
+ k = _alpm_db_whatprovides(db, depend.name);
+ if(k) {
+ /* grab the first one (there should only really be one, anyway) */
+ pmpkg_t *p = db_scan(db, ((pmpkg_t *)k->data)->name, INFRQ_DESC);
+ if(p == NULL) {
+ /* wtf */
+ fprintf(stderr, "data error: %s supposedly provides %s, but it was not found in db\n",
+ ((pmpkg_t *)k->data)->name, depend.name);
+ for(lp = k; lp; lp = lp->next) {
+ lp->data = NULL;
+ }
+ pm_list_free(k);
+ continue;
+ }
+ if(depend.mod == PM_DEP_ANY) {
+ /* accept any version */
+ found = 1;
+ } else {
+ char *ver = strdup(p->version);
+ /* check for a release in depend.version. if it's
+ * missing remove it from p->version as well.
+ */
+ if(!index(depend.version,'-')) {
+ char *ptr;
+ for(ptr = ver; *ptr != '-'; ptr++);
+ *ptr = '\0';
+ }
+ cmp = rpmvercmp(ver, depend.version);
+ switch(depend.mod) {
+ case PM_DEP_EQ: found = (cmp == 0); break;
+ case PM_DEP_GE: found = (cmp >= 0); break;
+ case PM_DEP_LE: found = (cmp <= 0); break;
+ }
+ FREE(ver);
+ }
+ }
+ for(lp = k; lp; lp = lp->next) {
+ lp->data = NULL;
+ }
+ pm_list_free(k);
+ }
+ /* else if still not found... */
+ if(!found) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_DEPEND;
+ miss->depend.mod = depend.mod;
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, depend.name, 256);
+ strncpy(miss->depend.version, depend.version, 64);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ }
+ } else if(op == PM_TRANS_TYPE_REMOVE) {
+ /* check requiredby fields */
+ for(i = packages; i; i = i->next) {
+ pmpkg_t *tp;
+ if(i->data == NULL) {
+ continue;
+ }
+ tp = (pmpkg_t*)i->data;
+ for(j = tp->requiredby; j; j = j->next) {
+ if(!pm_list_is_strin((char *)j->data, packages)) {
+ MALLOC(miss, sizeof(pmdepmissing_t));
+ miss->type = PM_DEP_REQUIRED;
+ miss->depend.mod = PM_DEP_ANY;
+ miss->depend.version[0] = '\0';
+ strncpy(miss->target, tp->name, 256);
+ strncpy(miss->depend.name, (char *)j->data, 256);
+ if(!pm_list_is_ptrin(baddeps, miss)) {
+ baddeps = pm_list_add(baddeps, miss);
+ }
+ }
+ }
+ }
+ }
+
+ return(baddeps);
+}
+
+void splitdep(char *depstr, pmdepend_t *depend)
+{
+ char *str = NULL;
+ char *ptr = NULL;
+
+ if(depstr == NULL) {
+ return;
+ }
+
+ str = strdup(depstr);
+
+ if((ptr = strstr(str, ">="))) {
+ depend->mod = PM_DEP_GE;
+ } else if((ptr = strstr(str, "<="))) {
+ depend->mod = PM_DEP_LE;
+ } else if((ptr = strstr(str, "="))) {
+ depend->mod = PM_DEP_EQ;
+ } else {
+ /* no version specified - accept any */
+ depend->mod = PM_DEP_ANY;
+ strncpy(depend->name, str, sizeof(depend->name));
+ strncpy(depend->version, "", sizeof(depend->version));
+ }
+
+ if(ptr == NULL) {
+ FREE(str);
+ return;
+ }
+ *ptr = '\0';
+ strncpy(depend->name, str, sizeof(depend->name));
+ ptr++;
+ if(depend->mod != PM_DEP_EQ) {
+ ptr++;
+ }
+ strncpy(depend->version, ptr, sizeof(depend->version));
+ FREE(str);
+
+ return;
+}
+
+/* return a new PMList target list containing all packages in the original
+ * target list, as well as all their un-needed dependencies. By un-needed,
+ * I mean dependencies that are *only* required for packages in the target
+ * list, so they can be safely removed. This function is recursive.
+ */
+PMList* removedeps(pmdb_t *db, PMList *targs)
+{
+ PMList *i, *j, *k;
+ PMList *newtargs = targs;
+
+ if(db == NULL) {
+ return(newtargs);
+ }
+
+ for(i = targs; i; i = i->next) {
+ pmpkg_t *pkg = (pmpkg_t*)i->data;
+ for(j = pkg->depends; j; j = j->next) {
+ pmdepend_t depend;
+ pmpkg_t *dep;
+ int needed = 0;
+ splitdep(j->data, &depend);
+ dep = db_scan(db, depend.name, INFRQ_DESC | INFRQ_DEPENDS);
+ if(pkg_isin(dep, targs)) {
+ continue;
+ }
+ /* see if it was explicitly installed */
+ if(dep->reason == PM_PKG_REASON_EXPLICIT) {
+ /* ORE
+ vprint("excluding %s -- explicitly installed\n", dep->name);*/
+ needed = 1;
+ }
+ /* see if other packages need it */
+ for(k = dep->requiredby; k && !needed; k = k->next) {
+ pmpkg_t *dummy = db_scan(db, k->data, INFRQ_DESC);
+ if(!pkg_isin(dummy, targs)) {
+ needed = 1;
+ }
+ }
+ if(!needed) {
+ /* add it to the target list */
+ pkg_free(dep);
+ dep = db_scan(db, depend.name, INFRQ_ALL);
+ newtargs = pm_list_add(newtargs, dep);
+ newtargs = removedeps(db, newtargs);
+ }
+ }
+ }
+
+ return(newtargs);
+}
+
+/* populates *list with packages that need to be installed to satisfy all
+ * dependencies (recursive) for *syncpkg->pkg
+ *
+ * make sure *list and *trail are already initialized
+ */
+int resolvedeps(pmdb_t *local, PMList *databases, pmsync_t *sync, PMList *list, PMList *trail, PMList **data)
+{
+ PMList *i, *j;
+ PMList *targ = NULL;
+ PMList *deps = NULL;
+
+ targ = pm_list_add(targ, sync->spkg);
+ deps = checkdeps(local, PM_TRANS_TYPE_ADD, targ);
+ targ->data = NULL;
+ pm_list_free(targ);
+
+ if(deps == NULL) {
+ return(0);
+ }
+
+ for(i = deps; i; i = i->next) {
+ int found = 0;
+ pmdepmissing_t *miss = i->data;
+
+ /* XXX: conflicts are now treated specially in the _add and _sync functions */
+
+ /*if(miss->type == CONFLICT) {
+ fprintf(stderr, "error: cannot resolve dependencies for \"%s\":\n", miss->target);
+ fprintf(stderr, " %s conflicts with %s\n", miss->target, miss->depend.name);
+ return(1);
+ } else*/
+
+ if(miss->type == PM_DEP_DEPEND) {
+ pmsync_t *sync = NULL;
+
+ /* find the package in one of the repositories */
+
+ /* check literals */
+ for(j = databases; !sync && j; j = j->next) {
+ PMList *k;
+ pmdb_t *dbs = j->data;
+
+ for(k = db_get_pkgcache(dbs); !sync && k; k = k->next) {
+ pmpkg_t *pkg = k->data;
+
+ if(!strcmp(miss->depend.name, pkg->name)) {
+ sync = sync_new(PM_SYSUPG_DEPEND, NULL, k->data);
+ if(sync == NULL) {
+ pm_errno = PM_ERR_MEMORY;
+ goto error;
+ }
+ /* ORE
+ sync->pkg->reason = PM_PKG_REASON_DEPEND;*/
+ }
+ }
+ }
+
+ /* check provides */
+ /* ORE
+ for(j = databases; !s && j; j = j->next) {
+ PMList *provides;
+
+ provides = _alpm_db_whatprovides(j->data, miss->depend.name);
+ if(provides) {
+ s = sync_new(PM_SYSUPG_DEPEND, NULL, !!!provides->data!!!);
+ if(s == NULL) {
+ pm_errno = PM_ERR_MEMORY;
+ FREELIST(deps);
+ return(-1);
+ }
+ sync->pkg->reason = PM_PKG_REASON_DEPEND;
+ }
+ FREELIST(provides);
+ }*/
+
+ if(sync == NULL) {
+ pmdepmissing_t *m = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t));
+ if(m == NULL) {
+ /* ORE
+ Free memory before leaving */
+ pm_errno = PM_ERR_MEMORY;
+ goto error;
+ }
+ *m = *(pmdepmissing_t *)i->data;
+ *data = pm_list_add(*data, m);
+ continue;
+ }
+
+ if(*data) {
+ /* there is at least an unresolvable dep... so we only
+ * continue to get the whole list of unresolvable deps */
+ continue;
+ }
+
+ found = 0;
+ for(j = list; j && !found; j = j->next) {
+ pmsync_t *tmp = j->data;
+
+ if(tmp && !strcmp(tmp->spkg->name, sync->spkg->name)) {
+ found = 1;
+ }
+ }
+
+ if(found) {
+ /* this dep is already in the target list */
+ FREE(sync);
+ continue;
+ }
+
+ _alpm_log(PM_LOG_FLOW2, "resolving %s", sync->spkg->name);
+ found = 0;
+ for(j = trail; j; j = j->next) {
+ pmsync_t *tmp = j->data;
+
+ if(tmp && !strcmp(tmp->spkg->name, sync->spkg->name)) {
+ found = 1;
+ }
+ }
+
+ if(!found) {
+ trail = pm_list_add(trail, sync);
+ if(resolvedeps(local, databases, sync, list, trail, data)) {
+ goto error;
+ }
+ _alpm_log(PM_LOG_FLOW2, "adding %s-%s", sync->spkg->name, sync->spkg->version);
+ list = pm_list_add(list, sync);
+ } else {
+ /* cycle detected -- skip it */
+ _alpm_log(PM_LOG_FLOW2, "dependency cycle detected: %s", sync->spkg->name);
+ FREE(sync);
+ }
+ }
+ }
+
+ FREELIST(deps);
+
+ if(*data) {
+ pm_errno = PM_ERR_UNRESOLVABLE_DEPS;
+ return(-1);
+ }
+
+ return(0);
+
+error:
+ FREELIST(deps);
+ return(-1);
+}
+
+/* vim: set ts=2 sw=2 noet: */