/* * deps.c * * Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org> * Copyright (c) 2005 by Aurelien Foret <orelien@chez.com> * Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.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 "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #ifdef __sun__ #include <strings.h> #endif #include <libintl.h> #include <math.h> /* libalpm */ #include "deps.h" #include "alpm_list.h" #include "util.h" #include "log.h" #include "error.h" #include "package.h" #include "db.h" #include "cache.h" #include "provide.h" #include "versioncmp.h" #include "handle.h" extern pmhandle_t *handle; pmdepmissing_t *_alpm_depmiss_new(const char *target, pmdeptype_t type, pmdepmod_t depmod, const char *depname, const char *depversion) { pmdepmissing_t *miss; ALPM_LOG_FUNC; miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t)); if(miss == NULL) { _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t)); RET_ERR(PM_ERR_MEMORY, NULL); } STRNCPY(miss->target, target, PKG_NAME_LEN); miss->type = type; miss->depend.mod = depmod; STRNCPY(miss->depend.name, depname, PKG_NAME_LEN); if(depversion) { STRNCPY(miss->depend.version, depversion, PKG_VERSION_LEN); } else { miss->depend.version[0] = 0; } return(miss); } int _alpm_depmiss_isin(pmdepmissing_t *needle, alpm_list_t *haystack) { alpm_list_t *i; ALPM_LOG_FUNC; for(i = haystack; i; i = i->next) { pmdepmissing_t *miss = i->data; if(!memcmp(needle, miss, sizeof(pmdepmissing_t)) && !memcmp(&needle->depend, &miss->depend, sizeof(pmdepend_t))) { return(1); } } return(0); } /* Re-order a list of target packages with respect to their dependencies. * * Example (PM_TRANS_TYPE_ADD): * A depends on C * B depends on A * Target order is A,B,C,D * * Should be re-ordered to C,A,B,D * * mode should be either PM_TRANS_TYPE_ADD or PM_TRANS_TYPE_REMOVE. This * affects the dependency order sortbydeps() will use. * * This function returns the new alpm_list_t* target list. * */ alpm_list_t *_alpm_sortbydeps(alpm_list_t *targets, pmtranstype_t mode) { alpm_list_t *newtargs = NULL; alpm_list_t *i, *j, *k, *l; int change = 1; int numscans = 0; int numtargs = 0; int maxscans; ALPM_LOG_FUNC; if(targets == NULL) { return(NULL); } for(i = targets; i; i = i->next) { newtargs = alpm_list_add(newtargs, i->data); numtargs++; } maxscans = (int)sqrt(numtargs); _alpm_log(PM_LOG_DEBUG, _("started sorting dependencies")); while(change) { alpm_list_t *tmptargs = NULL; change = 0; if(numscans > maxscans) { _alpm_log(PM_LOG_DEBUG, _("possible dependency cycle detected")); continue; } numscans++; /* run thru targets, moving up packages as necessary */ for(i = newtargs; i; i = i->next) { pmpkg_t *p = i->data; _alpm_log(PM_LOG_DEBUG, " sorting %s", alpm_pkg_get_name(p)); for(j = alpm_pkg_get_depends(p); j; j = j->next) { pmdepend_t *depend = _alpm_splitdep(j->data); pmpkg_t *q = NULL; if(depend == NULL) { continue; } /* look for depend->name -- if it's farther down in the list, then * move it up above p */ for(k = i->next; k; k = k->next) { q = k->data; const char *qname = alpm_pkg_get_name(q); if(!strcmp(depend->name, qname)) { if(!_alpm_pkg_find(qname, tmptargs)) { change = 1; tmptargs = alpm_list_add(tmptargs, q); } break; } for(l = alpm_pkg_get_provides(q); l; l = l->next) { const char *provname = l->data; if(!strcmp(depend->name, provname)) { if(!_alpm_pkg_find(provname, tmptargs)) { change = 1; tmptargs = alpm_list_add(tmptargs, q); } break; } } } free(depend); } if(!_alpm_pkg_find(alpm_pkg_get_name(p), tmptargs)) { tmptargs = alpm_list_add(tmptargs, p); } } FREELISTPTR(newtargs); newtargs = tmptargs; } _alpm_log(PM_LOG_DEBUG, _("sorting dependencies finished")); if(mode == PM_TRANS_TYPE_REMOVE) { /* we're removing packages, so reverse the order */ alpm_list_t *tmptargs = alpm_list_reverse(newtargs); /* free the old one */ FREELISTPTR(newtargs); newtargs = tmptargs; } return(newtargs); } /** Checks dependencies and returns missing ones in a list. Dependencies can include versions with depmod operators. * @param trans pointer to the transaction object * @param db pointer to the local package database * @param op transaction type * @param packages an alpm_list_t* of packages to be checked * @return an alpm_list_t* of missing_t pointers. */ alpm_list_t *_alpm_checkdeps(pmtrans_t *trans, pmdb_t *db, pmtranstype_t op, alpm_list_t *packages) { alpm_list_t *i, *j, *k, *l; int found = 0; alpm_list_t *baddeps = NULL; pmdepmissing_t *miss = NULL; ALPM_LOG_FUNC; 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 *newpkg = i->data; pmpkg_t *oldpkg; if(newpkg == NULL) { _alpm_log(PM_LOG_DEBUG, _("null package found in package list")); continue; } if((oldpkg = _alpm_db_get_pkgfromcache(db, alpm_pkg_get_name(newpkg))) == NULL) { _alpm_log(PM_LOG_DEBUG, _("cannot find package installed '%s'"), alpm_pkg_get_name(newpkg)); continue; } for(j = alpm_pkg_get_requiredby(oldpkg); j; j = j->next) { pmpkg_t *p; found = 0; if((p = _alpm_db_get_pkgfromcache(db, j->data)) == NULL) { /* hmmm... package isn't installed.. */ continue; } if(_alpm_pkg_find(alpm_pkg_get_name(p), packages)) { /* this package also in the upgrade list, so don't worry about it */ continue; } for(k = alpm_pkg_get_depends(p); k; k = k->next) { /* don't break any existing dependencies (possible provides) */ pmdepend_t *depend = _alpm_splitdep(k->data); if(depend == NULL) { continue; } /* if oldpkg satisfied this dep, and newpkg doesn't */ if(_alpm_depcmp(oldpkg, depend) && !_alpm_depcmp(newpkg, depend)) { /* we've found a dep that was removed... see if any other package * still contains/provides the dep */ int satisfied = 0; for(l = packages; l; l = l->next) { pmpkg_t *pkg = l->data; if(_alpm_depcmp(pkg, depend)) { _alpm_log(PM_LOG_DEBUG, _("checkdeps: dependency '%s' has moved from '%s' to '%s'"), depend->name, alpm_pkg_get_name(oldpkg), alpm_pkg_get_name(pkg)); satisfied = 1; break; } } if(!satisfied) { /* worst case... check installed packages to see if anything else * satisfies this... */ for(l = _alpm_db_get_pkgcache(db); l; l = l->next) { pmpkg_t *pkg = l->data; if(strcmp(alpm_pkg_get_name(pkg), alpm_pkg_get_name(oldpkg)) == 0) { /* well, we know this one succeeds, but we're removing it... skip it */ continue; } if(_alpm_depcmp(pkg, depend)) { _alpm_log(PM_LOG_DEBUG, _("checkdeps: dependency '%s' satisfied by installed package '%s'"), depend->name, alpm_pkg_get_name(pkg)); satisfied = 1; break; } } } if(!satisfied) { _alpm_log(PM_LOG_DEBUG, _("checkdeps: updated '%s' won't satisfy a dependency of '%s'"), alpm_pkg_get_name(oldpkg), alpm_pkg_get_name(p)); miss = _alpm_depmiss_new(p->name, PM_DEP_TYPE_REQUIRED, depend->mod, depend->name, depend->version); if(!_alpm_depmiss_isin(miss, baddeps)) { baddeps = alpm_list_add(baddeps, miss); } else { FREE(miss); } } } free(depend); } } } } if(op == PM_TRANS_TYPE_ADD || op == PM_TRANS_TYPE_UPGRADE) { /* DEPENDENCIES -- look for unsatisfied dependencies */ for(i = packages; i; i = i->next) { pmpkg_t *tp = i->data; if(tp == NULL) { _alpm_log(PM_LOG_DEBUG, _("null package found in package list")); continue; } for(j = alpm_pkg_get_depends(tp); j; j = j->next) { /* split into name/version pairs */ pmdepend_t *depend = _alpm_splitdep((char*)j->data); if(depend == NULL) { continue; } found = 0; /* check database for literal packages */ for(k = _alpm_db_get_pkgcache(db); k && !found; k = k->next) { pmpkg_t *p = (pmpkg_t *)k->data; found = _alpm_depcmp(p, depend); } /* check database for provides matches */ if(!found) { alpm_list_t *m; for(m = _alpm_db_whatprovides(db, depend->name); m && !found; m = m->next) { /* look for a match that isn't one of the packages we're trying * to install. this way, if we match against a to-be-installed * package, we'll defer to the NEW one, not the one already * installed. */ pmpkg_t *p = m->data; alpm_list_t *n; int skip = 0; for(n = packages; n && !skip; n = n->next) { pmpkg_t *ptp = n->data; if(strcmp(alpm_pkg_get_name(ptp), alpm_pkg_get_name(p)) == 0) { skip = 1; } } if(skip) { continue; } found = _alpm_depcmp(p, depend); } FREELISTPTR(k); } /* check other targets */ for(k = packages; k && !found; k = k->next) { pmpkg_t *p = k->data; found = _alpm_depcmp(p, depend); } /* else if still not found... */ if(!found) { _alpm_log(PM_LOG_DEBUG, _("missing dependency '%s' for package '%s'"), depend->name, alpm_pkg_get_name(tp)); miss = _alpm_depmiss_new(alpm_pkg_get_name(tp), PM_DEP_TYPE_DEPEND, depend->mod, depend->name, depend->version); if(!_alpm_depmiss_isin(miss, baddeps)) { baddeps = alpm_list_add(baddeps, miss); } else { FREE(miss); } } free(depend); } } } else if(op == PM_TRANS_TYPE_REMOVE) { /* check requiredby fields */ for(i = packages; i; i = i->next) { pmpkg_t *tp = i->data; if(tp == NULL) { continue; } found=0; for(j = alpm_pkg_get_requiredby(tp); j; j = j->next) { /* Search for 'reqname' in packages for removal */ char *reqname = j->data; alpm_list_t *x = NULL; for(x = packages; x; x = x->next) { pmpkg_t *xp = x->data; if(strcmp(reqname, alpm_pkg_get_name(xp)) == 0) { found = 1; break; } } if(!found) { /* check if a package in trans->packages provides this package */ for(k = trans->packages; !found && k; k=k->next) { pmpkg_t *spkg = NULL; if(trans->type == PM_TRANS_TYPE_SYNC) { pmsyncpkg_t *sync = k->data; spkg = sync->pkg; } else { spkg = k->data; } if(spkg) { if(alpm_list_find_str(alpm_pkg_get_provides(spkg), tp->name)) { found = 1; } } } if(!found) { _alpm_log(PM_LOG_DEBUG, _("checkdeps: found %s as required by %s"), reqname, alpm_pkg_get_name(tp)); miss = _alpm_depmiss_new(alpm_pkg_get_name(tp), PM_DEP_TYPE_REQUIRED, PM_DEP_MOD_ANY, j->data, NULL); if(!_alpm_depmiss_isin(miss, baddeps)) { baddeps = alpm_list_add(baddeps, miss); } else { FREE(miss); } } } } } } return(baddeps); } pmdepend_t *_alpm_splitdep(const char *depstring) { pmdepend_t *depend; char *ptr = NULL; if(depstring == NULL) { return(NULL); } depend = (pmdepend_t *)malloc(sizeof(pmdepend_t)); if(depend == NULL) { _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepend_t)); return(NULL); } /* Find a version comparator if one exists. If it does, set the type and * increment the ptr accordingly so we can copy the right strings. */ if((ptr = strstr(depstring, ">="))) { depend->mod = PM_DEP_MOD_GE; *ptr = '\0'; ptr += 2; } else if((ptr = strstr(depstring, "<="))) { depend->mod = PM_DEP_MOD_LE; *ptr = '\0'; ptr += 2; } else if((ptr = strstr(depstring, "="))) { depend->mod = PM_DEP_MOD_EQ; *ptr = '\0'; ptr += 1; } else { /* no version specified - copy in the name and return it */ depend->mod = PM_DEP_MOD_ANY; strncpy(depend->name, depstring, PKG_NAME_LEN); depend->version[0] = '\0'; return(depend); } /* if we get here, we have a version comparator, copy the right parts * to the right places */ strncpy(depend->name, depstring, PKG_NAME_LEN); strncpy(depend->version, ptr, PKG_VERSION_LEN); return(depend); } /* These parameters are messy. We check if this package, given a list of * targets (and a db), is safe to remove. We do NOT remove it if it is in the * target list */ static int can_remove_package(pmdb_t *db, pmpkg_t *pkg, alpm_list_t *targets) { alpm_list_t *i; if(_alpm_pkg_find(alpm_pkg_get_name(pkg), targets)) { return(0); } /* see if it was explicitly installed */ if(alpm_pkg_get_reason(pkg) == PM_PKG_REASON_EXPLICIT) { _alpm_log(PM_LOG_DEBUG, _("excluding %s -- explicitly installed"), alpm_pkg_get_name(pkg)); return(0); } /* see if other packages need it */ for(i = alpm_pkg_get_requiredby(pkg); i; i = i->next) { pmpkg_t *reqpkg = _alpm_db_get_pkgfromcache(db, i->data); if(reqpkg && !_alpm_pkg_find(alpm_pkg_get_name(reqpkg), targets)) { return(0); } } /* it's ok to remove */ return(1); } /* return a new alpm_list_t 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. */ alpm_list_t *_alpm_removedeps(pmdb_t *db, alpm_list_t *targs) { alpm_list_t *i, *j, *k; alpm_list_t *newtargs = targs; ALPM_LOG_FUNC; if(db == NULL) { return(newtargs); } for(i = targs; i; i = i->next) { pmpkg_t *pkg = i->data; for(j = alpm_pkg_get_depends(pkg); j; j = j->next) { pmdepend_t *depend = _alpm_splitdep(j->data); pmpkg_t *deppkg; if(depend == NULL) { continue; } deppkg = _alpm_db_get_pkgfromcache(db, depend->name); if(deppkg == NULL) { /* package not found... look for a provision instead */ alpm_list_t *provides = _alpm_db_whatprovides(db, depend->name); if(!provides) { /* Not found, that's fine, carry on */ _alpm_log(PM_LOG_DEBUG, _("cannot find package \"%s\" or anything that provides it!"), depend->name); continue; } for(k = provides; k; k = k->next) { pmpkg_t *provpkg = k->data; if(can_remove_package(db, provpkg, newtargs)) { pmpkg_t *pkg = _alpm_pkg_new(alpm_pkg_get_name(provpkg), alpm_pkg_get_version(provpkg)); _alpm_log(PM_LOG_DEBUG, _("adding '%s' to the targets"), alpm_pkg_get_name(pkg)); /* add it to the target list */ newtargs = alpm_list_add(newtargs, pkg); newtargs = _alpm_removedeps(db, newtargs); } } FREELISTPTR(provides); } else if(can_remove_package(db, deppkg, newtargs)) { pmpkg_t *pkg = _alpm_pkg_new(deppkg->name, deppkg->version); _alpm_log(PM_LOG_DEBUG, _("adding '%s' to the targets"), alpm_pkg_get_name(pkg)); /* add it to the target list */ newtargs = alpm_list_add(newtargs, pkg); newtargs = _alpm_removedeps(db, newtargs); } free(depend); } } return(newtargs); } /* populates *list with packages that need to be installed to satisfy all * dependencies (recursive) for syncpkg * * make sure *list and *trail are already initialized */ int _alpm_resolvedeps(pmdb_t *local, alpm_list_t *dbs_sync, pmpkg_t *syncpkg, alpm_list_t *list, alpm_list_t *trail, pmtrans_t *trans, alpm_list_t **data) { alpm_list_t *i, *j; alpm_list_t *targ; alpm_list_t *deps = NULL; ALPM_LOG_FUNC; if(local == NULL || dbs_sync == NULL || syncpkg == NULL) { return(-1); } _alpm_log(PM_LOG_DEBUG, _("started resolving dependencies")); targ = alpm_list_add(NULL, syncpkg); deps = _alpm_checkdeps(trans, local, PM_TRANS_TYPE_ADD, targ); FREELISTPTR(targ); if(deps == NULL) { return(0); } for(i = deps; i; i = i->next) { int found = 0; pmdepmissing_t *miss = i->data; pmpkg_t *sync = NULL; /* check if one of the packages in *list already provides this dependency */ for(j = list; j && !found; j = j->next) { pmpkg_t *sp = j->data; if(alpm_list_find_str(alpm_pkg_get_provides(sp), miss->depend.name)) { _alpm_log(PM_LOG_DEBUG, _("%s provides dependency %s -- skipping"), alpm_pkg_get_name(sp), miss->depend.name); found = 1; } } if(found) { continue; } /* find the package in one of the repositories */ /* check literals */ for(j = dbs_sync; !sync && j; j = j->next) { sync = _alpm_db_get_pkgfromcache(j->data, miss->depend.name); } /*TODO this autoresolves the first 'provides' package... we should fix this * somehow */ /* check provides */ if(!sync) { for(j = dbs_sync; !sync && j; j = j->next) { alpm_list_t *provides; provides = _alpm_db_whatprovides(j->data, miss->depend.name); if(provides) { sync = provides->data; } FREELISTPTR(provides); } } if(!sync) { _alpm_log(PM_LOG_ERROR, _("cannot resolve dependencies for \"%s\" (\"%s\" is not in the package set)"), miss->target, miss->depend.name); if(data) { if((miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t))) == NULL) { _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t)); FREELIST(*data); pm_errno = PM_ERR_MEMORY; goto error; } *miss = *(pmdepmissing_t *)i->data; *data = alpm_list_add(*data, miss); } pm_errno = PM_ERR_UNSATISFIED_DEPS; goto error; } if(_alpm_pkg_find(alpm_pkg_get_name(sync), list)) { /* this dep is already in the target list */ _alpm_log(PM_LOG_DEBUG, _("dependency %s is already in the target list -- skipping"), alpm_pkg_get_name(sync)); continue; } if(!_alpm_pkg_find(alpm_pkg_get_name(sync), trail)) { /* check pmo_ignorepkg and pmo_s_ignore to make sure we haven't pulled in * something we're not supposed to. */ int usedep = 1; if(alpm_list_find_str(handle->ignorepkg, alpm_pkg_get_name(sync))) { pmpkg_t *dummypkg = _alpm_pkg_new(miss->target, NULL); QUESTION(trans, PM_TRANS_CONV_INSTALL_IGNOREPKG, dummypkg, sync, NULL, &usedep); FREEPKG(dummypkg); } if(usedep) { trail = alpm_list_add(trail, sync); if(_alpm_resolvedeps(local, dbs_sync, sync, list, trail, trans, data)) { goto error; } _alpm_log(PM_LOG_DEBUG, _("pulling dependency %s (needed by %s)"), alpm_pkg_get_name(sync), alpm_pkg_get_name(syncpkg)); list = alpm_list_add(list, sync); } else { _alpm_log(PM_LOG_ERROR, _("cannot resolve dependencies for \"%s\""), miss->target); if(data) { if((miss = (pmdepmissing_t *)malloc(sizeof(pmdepmissing_t))) == NULL) { _alpm_log(PM_LOG_ERROR, _("malloc failure: could not allocate %d bytes"), sizeof(pmdepmissing_t)); FREELIST(*data); pm_errno = PM_ERR_MEMORY; goto error; } *miss = *(pmdepmissing_t *)i->data; *data = alpm_list_add(*data, miss); } pm_errno = PM_ERR_UNSATISFIED_DEPS; goto error; } } else { /* cycle detected -- skip it */ _alpm_log(PM_LOG_DEBUG, _("dependency cycle detected: %s"), sync->name); } } _alpm_log(PM_LOG_DEBUG, _("finished resolving dependencies")); FREELIST(deps); return(0); error: FREELIST(deps); return(-1); } const char SYMEXPORT *alpm_dep_get_target(pmdepmissing_t *miss) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return(NULL)); ASSERT(miss != NULL, return(NULL)); return miss->target; } pmdeptype_t SYMEXPORT alpm_dep_get_type(pmdepmissing_t *miss) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return(-1)); ASSERT(miss != NULL, return(-1)); return miss->type; } pmdepmod_t SYMEXPORT alpm_dep_get_mod(pmdepmissing_t *miss) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return(-1)); ASSERT(miss != NULL, return(-1)); return miss->depend.mod; } const char SYMEXPORT *alpm_dep_get_name(pmdepmissing_t *miss) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return(NULL)); ASSERT(miss != NULL, return(NULL)); return miss->depend.name; } const char SYMEXPORT *alpm_dep_get_version(pmdepmissing_t *miss) { ALPM_LOG_FUNC; /* Sanity checks */ ASSERT(handle != NULL, return(NULL)); ASSERT(miss != NULL, return(NULL)); return miss->depend.version; } /* vim: set ts=2 sw=2 noet: */