Initial revision

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: */