1LIBSOLV-POOL(3)                     LIBSOLV                    LIBSOLV-POOL(3)
2
3
4

NAME

6       libsolv-pool - Libsolv's pool object
7

PUBLIC ATTRIBUTES

9       void *appdata
10           A no-purpose pointer free to use for the library user. Freeing the
11           pool simply discards the pointer.
12
13       Stringpool ss
14           The pool of unified strings.
15
16       Reldep *rels
17           The pool of unified relation dependencies.
18
19       int nrels
20           Number of allocated relation dependencies.
21
22       Repo **repos
23           The array of repository pointers, indexed by repository Id.
24
25       int nrepos
26           Number of allocated repository array elements, i.e. the size of the
27           repos array.
28
29       int urepos
30           Number of used (i.e. non-zero) repository array elements.
31
32       Repo *installed
33           Pointer to the repo holding the installed packages. You are free to
34           read this attribute, but you should use pool_set_installed() if you
35           want to change it.
36
37       Solvable *solvables
38           The array of Solvable objects.
39
40       int nsolvables
41           Number of Solvable objects, i.e. the size of the solvables array.
42           Note that the array may contain freed solvables, in that case the
43           repo pointer of the solvable will be zero.
44
45       int disttype
46           The distribution type of your system, e.g. DISTTYPE_DEB. You are
47           free to read this attribute, but you should use pool_setdisttype()
48           if you want to change it.
49
50       Id *whatprovidesdata
51           Multi-purpose Id storage holding zero terminated arrays of Ids.
52           pool_whatprovides() returns an offset into this data.
53
54       Map *considered
55           Optional bitmap that can make the library ignore solvables. If a
56           bitmap is set, only solvables that have a set bit in the bitmap at
57           their Id are considered usable.
58
59       int debugmask
60           A mask that defines which debug events should be reported.
61           pool_setdebuglevel() sets this mask.
62
63       Datapos pos
64           An object storing some position in the repository data. Functions
65           like dataiterator_set_pos() set this object, accessing data with a
66           pseudo solvable Id of SOLVID_POS uses it.
67
68       Queue pooljobs
69           A queue where fixed solver jobs can be stored. This jobs are
70           automatically added when solver_solve() is called, they are useful
71           to store configuration data like which packages should be
72           multiversion installed.
73

CREATION AND DESTRUCTION

75           Pool *pool_create();
76
77       Create a new instance of a pool.
78
79           void pool_free(Pool *pool);
80
81       Free a pool and all of the data it contains, e.g. the solvables,
82       repositories, strings.
83

DEBUGGING AND ERROR REPORTING

85   Constants
86       SOLV_FATAL
87           Report the error and call “exit(1)” afterwards. You cannot mask
88           this level. Reports to stderr instead of stdout.
89
90       SOLV_ERROR
91           Used to report errors. Reports to stderr instead of stdout.
92
93       SOLV_WARN
94           Used to report warnings.
95
96       SOLV_DEBUG_STATS
97           Used to report statistical data.
98
99       SOLV_DEBUG_RULE_CREATION
100           Used to report information about the solver’s creation of rules.
101
102       SOLV_DEBUG_PROPAGATE
103           Used to report information about the solver’s unit rule propagation
104           process.
105
106       SOLV_DEBUG_ANALYZE
107           Used to report information about the solver’s learnt rule
108           generation mechanism.
109
110       SOLV_DEBUG_UNSOLVABLE
111           Used to report information about the solver dealing with
112           conflicting rules.
113
114       SOLV_DEBUG_SOLUTIONS
115           Used to report information about the solver creating solutions to
116           solve problems.
117
118       SOLV_DEBUG_POLICY
119           Used to report information about the solver searching for an
120           optimal solution.
121
122       SOLV_DEBUG_RESULT
123           Used by the debug functions to output results.
124
125       SOLV_DEBUG_JOB
126           Used to report information about the job rule generation process.
127
128       SOLV_DEBUG_SOLVER
129           Used to report information about what the solver is currently
130           doing.
131
132       SOLV_DEBUG_TRANSACTION
133           Used to report information about the transaction generation and
134           ordering process.
135
136       SOLV_DEBUG_TO_STDERR
137           Write debug messages to stderr instead of stdout.
138
139   Functions
140           void pool_debug(Pool *pool, int type, const char *format, ...);
141
142       Report a message of the type type. You can filter debug messages by
143       setting a debug mask.
144
145           void pool_setdebuglevel(Pool *pool, int level);
146
147       Set a predefined debug mask. A higher level generally means more bits
148       in the mask are set, thus more messages are printed.
149
150           void pool_setdebugmask(Pool *pool, int mask);
151
152       Set the debug mask to filter debug messages.
153
154           int pool_error(Pool *pool, int ret, const char *format, ...);
155
156       Set the pool’s error string. The ret value is simply used as a return
157       value of the function so that you can write code like return
158       pool_error(...);. If the debug mask contains the SOLV_ERROR bit,
159       pool_debug() is also called with the message and type SOLV_ERROR.
160
161           extern char *pool_errstr(Pool *pool);
162
163       Return the current error string stored in the pool. Like with the
164       libc’s errno value, the string is only meaningful after a function
165       returned an error.
166
167           void pool_setdebugcallback(Pool *pool, void (*debugcallback)(Pool *, void *data, int type, const char *str), void *debugcallbackdata);
168
169       Set a custom debug callback function. Instead of writing to stdout or
170       stderr, the callback function will be called.
171

POOL CONFIGURATION

173   Constants
174       DISTTYPE_RPM
175           Used for systems which use rpm as low level package manager.
176
177       DISTTYPE_DEB
178           Used for systems which use dpkg as low level package manager.
179
180       DISTTYPE_ARCH
181           Used for systems which use the arch linux package manager.
182
183       DISTTYPE_HAIKU
184           Used for systems which use haiku packages.
185
186       POOL_FLAG_PROMOTEEPOCH
187           Promote the epoch of the providing dependency to the requesting
188           dependency if it does not contain an epoch. Used at some time in
189           old rpm versions, modern systems should never need this.
190
191       POOL_FLAG_FORBIDSELFCONFLICTS
192           Disallow the installation of packages that conflict with
193           themselves. Debian always allows self-conflicting packages, rpm
194           used to forbid them but switched to also allowing them recently.
195
196       POOL_FLAG_OBSOLETEUSESPROVIDES
197           Make obsolete type dependency match against provides instead of
198           just the name and version of packages. Very old versions of rpm
199           used the name/version, then it got switched to provides and later
200           switched back again to just name/version.
201
202       POOL_FLAG_IMPLICITOBSOLETEUSESPROVIDES
203           An implicit obsoletes is the internal mechanism to remove the old
204           package on an update. The default is to remove all packages with
205           the same name, rpm-5 switched to also removing packages providing
206           the same name.
207
208       POOL_FLAG_OBSOLETEUSESCOLORS
209           Rpm’s multilib implementation (used in RedHat and Fedora)
210           distinguishes between 32bit and 64bit packages (the terminology is
211           that they have a different color). If obsoleteusescolors is set,
212           packages with different colors will not obsolete each other.
213
214       POOL_FLAG_IMPLICITOBSOLETEUSESCOLORS
215           Same as POOL_FLAG_OBSOLETEUSESCOLORS, but used to find out if
216           packages of the same name can be installed in parallel. For current
217           Fedora systems, POOL_FLAG_OBSOLETEUSESCOLORS should be false and
218           POOL_FLAG_IMPLICITOBSOLETEUSESCOLORS should be true (this is the
219           default if FEDORA is defined when libsolv is compiled).
220
221       POOL_FLAG_NOINSTALLEDOBSOLETES
222           New versions of rpm consider the obsoletes of installed packages
223           when checking for dependency, thus you may not install a package
224           that is obsoleted by some other installed package, unless you also
225           erase the other package.
226
227       POOL_FLAG_HAVEDISTEPOCH
228           Mandriva added a new field called distepoch that gets checked in
229           version comparison if the epoch/version/release of two packages are
230           the same.
231
232       POOL_FLAG_NOOBSOLETESMULTIVERSION
233           If a package is installed in multiversionmode, rpm used to ignore
234           both the implicit obsoletes and the obsolete dependency of a
235           package. This was changed to ignoring just the implicit obsoletes,
236           thus you may install multiple versions of the same name, but
237           obsoleted packages still get removed.
238
239       POOL_FLAG_ADDFILEPROVIDESFILTERED
240           Make the addfileprovides method only add files from the standard
241           locations (i.e. the “bin” and “etc” directories). This is useful if
242           you have only few packages that use non-standard file dependencies,
243           but you still want the fast speed that addfileprovides() generates.
244
245   Functions
246           int pool_setdisttype(Pool *pool, int disttype);
247
248       Set the package type of your system. The disttype is used for example
249       to define package comparison semantics. Libsolv’s default disttype
250       should match the package manager of your system, so you only need to
251       use this function if you want to use the library to solve packaging
252       problems for different systems. The Function returns the old disttype
253       on success, and -1 if the new disttype is not supported. Note that any
254       pool_setarch and pool_setarchpolicy calls need to come after the
255       pool_setdisttype call, as they make use of the noarch/any/all
256       architecture id.
257
258           int pool_set_flag(Pool *pool, int flag, int value);
259
260       Set a flag to a new value. Returns the old value of the flag.
261
262           int pool_get_flag(Pool *pool, int flag);
263
264       Get the value of a pool flag. See the constants section about the
265       meaning of the flags.
266
267           void pool_set_rootdir(Pool *pool, const char *rootdir);
268
269       Set a specific root directory. Some library functions support a flag
270       that tells the function to prepend the rootdir to file and directory
271       names.
272
273           const char *pool_get_rootdir(Pool *pool);
274
275       Return the current value of the root directory.
276
277           char *pool_prepend_rootdir(Pool *pool, const char *dir);
278
279       Prepend the root directory to the dir argument string. The returned
280       string has been newly allocated and needs to be freed after use.
281
282           char *pool_prepend_rootdir_tmp(Pool *pool, const char *dir);
283
284       Same as pool_prepend_rootdir, but uses the pool’s temporary space for
285       allocation.
286
287           void pool_set_installed(Pool *pool, Repo *repo);
288
289       Set which repository should be treated as the “installed” repository,
290       i.e. the one that holds information about the installed packages.
291
292           void pool_set_languages(Pool *pool, const char **languages, int nlanguages);
293
294       Set the language of your system. The library provides lookup functions
295       that return localized strings, for example for package descriptions.
296       You can set an array of languages to provide a fallback mechanism if
297       one language is not available.
298
299           void pool_setarch(Pool *pool, const char *arch);
300
301       Set the architecture of your system. The architecture is used to
302       determine which packages are installable and which packages cannot be
303       installed. The arch argument is normally the “machine” value of the
304       “uname” system call.
305
306           void pool_setarchpolicy(Pool *, const char *);
307
308       Set the architecture policy for your system. This is the general
309       version of pool_setarch (in fact pool_setarch calls pool_setarchpolicy
310       internally). See the section about architecture policies for more
311       information.
312
313           void pool_addvendorclass(Pool *pool, const char **vendorclass);
314
315       Add a new vendor equivalence class to the system. A vendor equivalence
316       class defines if an installed package of one vendor can be replaced by
317       a package coming from a different vendor. The vendorclass argument must
318       be a NULL terminated array of strings. See the section about vendor
319       policies for more information.
320
321           void pool_setvendorclasses(Pool *pool, const char **vendorclasses);
322
323       Set all allowed vendor equivalences. The vendorclasses argument must be
324       an NULL terminated array consisting of all allowed classes
325       concatenated. Each class itself must be NULL terminated, thus the last
326       class ends with two NULL elements, one to finish the class and one to
327       finish the list of classes.
328
329           void pool_set_custom_vendorcheck(Pool *pool, int (*vendorcheck)(Pool *, Solvable *, Solvable *));
330
331       Define a custom vendor check mechanism. You can use this if libsolv’s
332       internal vendor equivalence class mechanism does not match your needs.
333
334           void pool_setloadcallback(Pool *pool, int (*cb)(Pool *, Repodata *, void *), void *loadcbdata);
335
336       Define a callback function that gets called when repository metadata
337       needs to be loaded on demand. See the section about on demand loading
338       in the libsolv-repodata manual.
339
340           void pool_setnamespacecallback(Pool *pool, Id (*cb)(Pool *, void *, Id, Id), void *nscbdata);
341
342       Define a callback function to implement custom namespace support. See
343       the section about namespace dependencies.
344

ID POOL MANAGEMENT

346   Constants
347       ID_EMPTY
348           The Id of the empty string, it is always Id 1.
349
350       REL_LT
351           Represents a “<” relation.
352
353       REL_EQ
354           Represents a “=” relation.
355
356       REL_GT
357           Represents a “>” relation. You can use combinations of REL_GT,
358           REL_EQ, and REL_LT or-ed together to create any relation you like.
359
360       REL_AND
361           A boolean AND operation, the “name” and “evr” parts of the relation
362           can be two sub-dependencies. Packages must match both parts of the
363           dependency.
364
365       REL_OR
366           A boolean OR operation, the “name” and “evr” parts of the relation
367           can be two sub-dependencies. Packages can match any part of the
368           dependency.
369
370       REL_WITH
371           Like REL_AND, but packages must match both dependencies
372           simultaneously. See the section about boolean dependencies about
373           more information.
374
375       REL_NAMESPACE
376           A special namespace relation. See the section about namespace
377           dependencies for more information.
378
379       REL_ARCH
380           An architecture filter dependency. The “name” part of the relation
381           is a sub-dependency, the “evr” part is the Id of an architecture
382           that the matching packages must have (note that this is an exact
383           match ignoring architecture policies).
384
385       REL_FILECONFLICT
386           An internal file conflict dependency used to represent file
387           conflicts. See the pool_add_fileconflicts_deps() function.
388
389       REL_COND
390           A conditional dependency, the “name” sub-dependency is only
391           considered if the “evr” sub-dependency is fulfilled. See the
392           section about boolean dependencies about more information.
393
394       REL_UNLESS
395           A conditional dependency, the “name” sub-dependency is only
396           considered if the “evr” sub-dependency is not fulfilled. See the
397           section about boolean dependencies about more information.
398
399       REL_COMPAT
400           A compat dependency used in Haiku to represent version ranges. The
401           “name” part is the actual version, the “evr” part is the backwards
402           compatibility version.
403
404       REL_KIND
405           A pseudo dependency that limits the solvables to a specific kind.
406           The kind is expected to be a prefix of the solvable name, e.g.
407           “patch:foo” would be of kind “patch”. “REL_KIND” is only supported
408           in the selection functions.
409
410       REL_MULTIARCH
411           A debian multiarch annotation. The most common value for the “evr”
412           part is “any”.
413
414       REL_ELSE
415           The else part of a “REL_COND” or “REL_UNLESS” dependency. See the
416           section about boolean dependencies.
417
418       REL_ERROR
419           An illegal dependency. This is useful to encode dependency parse
420           errors.
421
422   Functions
423           Id pool_str2id(Pool *pool, const char *str, int create);
424
425       Add a string to the pool of unified strings, returning the Id of the
426       string. If create is zero, new strings will not be added to the pool,
427       instead Id 0 is returned.
428
429           Id pool_strn2id(Pool *pool, const char *str, unsigned int len, int create);
430
431       Same as pool_str2id, but only len characters of the string are used.
432       This can be used to add substrings to the pool.
433
434           Id pool_rel2id(Pool *pool, Id name, Id evr, int flags, int create);
435
436       Create a relational dependency from to other dependencies, name and
437       evr, and a flag. See the REL_ constants for the supported flags. As
438       with pool_str2id, create defines if new dependencies will get added or
439       Id zero will be returned instead.
440
441           Id pool_id2langid(Pool *pool, Id id, const char *lang, int create);
442
443       Attach a language suffix to a string Id. This function can be used to
444       create language keyname Ids from keynames, it is functional equivalent
445       to converting the id argument to a string, adding a “:” character and
446       the lang argument to the string and then converting the result back
447       into an Id.
448
449           const char *pool_id2str(const Pool *pool, Id id);
450
451       Convert an Id back into a string. If the Id is a relational Id, the
452       “name” part will be converted instead.
453
454           const char *pool_id2rel(const Pool *pool, Id id);
455
456       Return the relation string of a relational Id. Returns an empty string
457       if the passed Id is not a relation.
458
459           const char *pool_id2evr(const Pool *pool, Id id);
460
461       Return the “evr” part of a relational Id as string. Returns an empty
462       string if the passed Id is not a relation.
463
464           const char *pool_dep2str(Pool *pool, Id id);
465
466       Convert an Id back into a string. If the passed Id belongs to a
467       relation, a string representing the relation is returned. Note that in
468       that case the string is allocated on the pool’s temporary space.
469
470           void pool_freeidhashes(Pool *pool);
471
472       Free the hashes used to unify strings and relations. You can use this
473       function to save memory if you know that you will no longer create new
474       strings and relations.
475

SOLVABLE FUNCTIONS

477           Solvable *pool_id2solvable(const Pool *pool, Id p);
478
479       Convert a solvable Id into a pointer to the solvable data. Note that
480       the pointer may become invalid if new solvables are created or old
481       solvables deleted, because the array storing all solvables may get
482       reallocated.
483
484           Id pool_solvable2id(const Pool *pool, Solvable *s);
485
486       Convert a pointer to the solvable data into a solvable Id.
487
488           const char *pool_solvid2str(Pool *pool, Id p);
489
490       Return a string representing the solvable with the Id p. The string
491       will be some canonical representation of the solvable, usually a
492       combination of the name, the version, and the architecture.
493
494           const char *pool_solvable2str(Pool *pool, Solvable *s);
495
496       Same as pool_solvid2str, but instead of the Id, a pointer to the
497       solvable is passed.
498

DEPENDENCY MATCHING

500   Constants
501       EVRCMP_COMPARE
502           Compare all parts of the version, treat missing parts as empty
503           strings.
504
505       EVRCMP_MATCH_RELEASE
506           A special mode for rpm version string matching. If a version misses
507           a release part, it matches all releases. In that case the special
508           values “-2” and “2” are returned, depending on which of the two
509           versions did not have a release part.
510
511       EVRCMP_MATCH
512           A generic match, missing parts always match.
513
514       EVRCMP_COMPARE_EVONLY
515           Only compare the epoch and the version parts, ignore the release
516           part.
517
518   Functions
519           int pool_evrcmp(const Pool *pool, Id evr1id, Id evr2id, int mode);
520
521       Compare two version Ids, return -1 if the first version is less than
522       the second version, 0 if they are identical, and 1 if the first version
523       is bigger than the second one.
524
525           int pool_evrcmp_str(const Pool *pool, const char *evr1, const char *evr2, int mode);
526
527       Same as pool_evrcmp(), but uses strings instead of Ids.
528
529           int pool_evrmatch(const Pool *pool, Id evrid, const char *epoch, const char *version, const char *release);
530
531       Match a version Id against an epoch, a version and a release string.
532       Passing NULL means that the part should match everything.
533
534           int pool_match_dep(Pool *pool, Id d1, Id d2);
535
536       Returns “1” if the dependency d1 (the provider) is matched by the
537       dependency d2, otherwise “0” is returned. For two dependencies to
538       match, both the “name” parts must match and the version range described
539       by the “evr” parts must overlap.
540
541           int pool_match_nevr(Pool *pool, Solvable *s, Id d);
542
543       Like pool_match_dep, but the provider is the "self-provides" dependency
544       of the Solvable s, i.e. the dependency “s→name = s→evr”.
545

WHATPROVIDES INDEX

547           void pool_createwhatprovides(Pool *pool);
548
549       Create an index that maps dependency Ids to sets of packages that
550       provide the dependency.
551
552           void pool_freewhatprovides(Pool *pool);
553
554       Free the whatprovides index to save memory.
555
556           Id pool_whatprovides(Pool *pool, Id d);
557
558       Return an offset into the Pool’s whatprovidesdata array. The solvables
559       with the Ids stored starting at that offset provide the dependency d.
560       The solvable list is zero terminated.
561
562           Id *pool_whatprovides_ptr(Pool *pool, Id d);
563
564       Instead of returning the offset, return the pointer to the Ids stored
565       at that offset. Note that this pointer has a very limit validity time,
566       as any call that adds new values to the whatprovidesdata area may
567       reallocate the array.
568
569           Id pool_queuetowhatprovides(Pool *pool, Queue *q);
570
571       Add the contents of the Queue q to the end of the whatprovidesdata
572       array, returning the offset into the array.
573
574           void pool_addfileprovides(Pool *pool);
575
576       Some package managers like rpm allow dependencies on files contained in
577       other packages. To allow libsolv to deal with those dependencies in an
578       efficient way, you need to call the addfileprovides method after
579       creating and reading all repositories. This method will scan all
580       dependency for file names and then scan all packages for matching
581       files. If a filename has been matched, it will be added to the provides
582       list of the corresponding package.
583
584           void pool_addfileprovides_queue(Pool *pool, Queue *idq, Queue *idqinst);
585
586       Same as pool_addfileprovides, but the added Ids are returned in two
587       Queues, idq for all repositories except the one containing the
588       “installed” packages, idqinst for the latter one. This information can
589       be stored in the meta section of the repositories to speed up the next
590       time the repository is loaded and addfileprovides is called
591
592           void pool_set_whatprovides(pool, Id id, Id offset);
593
594       Manually set an entry in the whatprovides index. You’ll never do this
595       for package dependencies, as those entries are created by calling the
596       pool_createwhatprovides() function. But this function is useful for
597       namespace provides if you do not want to use a namespace callback to
598       lazily set the provides. The offset argument is a offset in the
599       whatprovides array, thus you can use “1” as a false value and “2” as
600       true value.
601
602           void pool_flush_namespaceproviders(Pool *pool, Id ns, Id evr);
603
604       Clear the cache of the providers for namespace dependencies matching
605       namespace ns. If the evr argument is non-zero, the namespace dependency
606       for exactly that dependency is cleared, otherwise all matching
607       namespace dependencies are cleared. See the section about Namespace
608       dependencies for further information.
609
610           void pool_add_fileconflicts_deps(Pool *pool, Queue *conflicts);
611
612       Some package managers like rpm report conflicts when a package
613       installation overwrites a file of another installed package with
614       different content. As file content information is not stored in the
615       repository metadata, those conflicts can only be detected after the
616       packages are downloaded. Libsolv provides a function to check for such
617       conflicts, pool_findfileconflicts(). If conflicts are found, they can
618       be added as special REL_FILECONFLICT provides dependencies, so that the
619       solver will know about the conflict when it is re-run.
620

UTILITY FUNCTIONS

622           char *pool_alloctmpspace(Pool *pool, int len);
623
624       Allocate space on the pool’s temporary space area. This space has a
625       limited lifetime, it will be automatically freed after a fixed amount
626       (currently 16) of other pool_alloctmpspace() calls are done.
627
628           void pool_freetmpspace(Pool *pool, const char *space);
629
630       Give the space allocated with pool_alloctmpspace back to the system.
631       You do not have to use this function, as the space is automatically
632       reclaimed, but it can be useful to extend the lifetime of other
633       pointers to the pool’s temporary space area.
634
635           const char *pool_bin2hex(Pool *pool, const unsigned char *buf, int len);
636
637       Convert some binary data to hexadecimal, returning a string allocated
638       in the pool’s temporary space area.
639
640           char *pool_tmpjoin(Pool *pool, const char *str1, const char *str2, const char *str3);
641
642       Join three strings and return the result in the pool’s temporary space
643       area. You can use NULL arguments if you just want to join less strings.
644
645           char *pool_tmpappend(Pool *pool, const char *str1, const char *str2, const char *str3);
646
647       Like pool_tmpjoin(), but if the first argument is the last allocated
648       space in the pool’s temporary space area, it will be replaced with the
649       result of the join and no new temporary space slot will be used. Thus
650       you can join more than three strings by a combination of one
651       pool_tmpjoin() and multiple pool_tmpappend() calls. Note that the str1
652       pointer is no longer usable after the call.
653

DATA LOOKUP

655   Constants
656       SOLVID_POS
657           Use the data position stored in the pool for the lookup instead of
658           looking up the data of a solvable.
659
660       SOLVID_META
661           Use the data stored in the meta section of a repository (or
662           repodata area) instead of looking up the data of a solvable. This
663           constant does not work for the pool’s lookup functions, use it for
664           the repo’s or repodata’s lookup functions instead. It’s just listed
665           for completeness.
666
667   Functions
668           const char *pool_lookup_str(Pool *pool, Id solvid, Id keyname);
669
670       Return the string value stored under the attribute keyname in solvable
671       solvid.
672
673           unsigned long long pool_lookup_num(Pool *pool, Id solvid, Id keyname, unsigned long long notfound);
674
675       Return the 64bit unsigned number stored under the attribute keyname in
676       solvable solvid. If no such number is found, the value of the notfound
677       argument is returned instead.
678
679           Id pool_lookup_id(Pool *pool, Id solvid, Id keyname);
680
681       Return the Id stored under the attribute keyname in solvable solvid.
682
683           int pool_lookup_idarray(Pool *pool, Id solvid, Id keyname, Queue *q);
684
685       Fill the queue q with the content of the Id array stored under the
686       attribute keyname in solvable solvid. Returns “1” if an array was
687       found, otherwise the queue will be empty and “0” will be returned.
688
689           int pool_lookup_void(Pool *pool, Id solvid, Id keyname);
690
691       Returns “1” if a void value is stored under the attribute keyname in
692       solvable solvid, otherwise “0”.
693
694           const char *pool_lookup_checksum(Pool *pool, Id solvid, Id keyname, Id *typep);
695
696       Return the checksum that is stored under the attribute keyname in
697       solvable solvid. The type of the checksum will be returned over the
698       typep pointer. If no such checksum is found, NULL will be returned and
699       the type will be set to zero. Note that the result is stored in the
700       Pool’s temporary space area.
701
702           const unsigned char *pool_lookup_bin_checksum(Pool *pool, Id solvid, Id keyname, Id *typep);
703
704       Return the checksum that is stored under the attribute keyname in
705       solvable solvid. Returns the checksum as binary data, you can use the
706       returned type to calculate the length of the checksum. No temporary
707       space area is needed.
708
709           const char *pool_lookup_deltalocation(Pool *pool, Id solvid, unsigned int *medianrp);
710
711       This is a utility lookup function to return the delta location for a
712       delta rpm. As solvables cannot store deltas, you have to use SOLVID_POS
713       as argument and set the Pool’s datapos pointer to point to valid delta
714       rpm data.
715
716           void pool_search(Pool *pool, Id solvid, Id keyname, const char *match, int flags, int (*callback)(void *cbdata, Solvable *s, Repodata *data, Repokey *key, KeyValue *kv), void *cbdata);
717
718       Perform a search on all data stored in the pool. You can limit the
719       search area by using the solvid and keyname arguments. The values can
720       be optionally matched against the match argument, use NULL if you do
721       not want this matching. See the Dataiterator manpage about the possible
722       matches modes and the flags argument. For all (matching) values, the
723       callback function is called with the cbdata callback argument and the
724       data describing the value.
725

JOB AND SELECTION FUNCTIONS

727       A Job consists of two Ids, how and what. The how part describes the
728       action, the job flags, and the selection method while the what part is
729       in input for the selection. A Selection is a queue consisting of
730       multiple jobs (thus the number of elements in the queue must be a
731       multiple of two). See the Solver manpage for more information about
732       jobs.
733
734           const char *pool_job2str(Pool *pool, Id how, Id what, Id flagmask);
735
736       Convert a job into a string. Useful for debugging purposes. The
737       flagmask can be used to mask the flags of the job, use “0” if you do
738       not want to see such flags, “-1” to see all flags, or a combination of
739       the flags you want to see.
740
741           void pool_job2solvables(Pool *pool, Queue *pkgs, Id how, Id what);
742
743       Return a list of solvables that the specified job selects.
744
745           int pool_isemptyupdatejob(Pool *pool, Id how, Id what);
746
747       Return “1” if the job is an update job that does not work with any
748       installed package, i.e. the job is basically a no-op. You can use this
749       to turn no-op update jobs into install jobs (as done by package
750       managers like “zypper”).
751
752           const char *pool_selection2str(Pool *pool, Queue *selection, Id flagmask);
753
754       Convert a selection into a string. Useful for debugging purposes. See
755       the pool_job2str() function for the flagmask argument.
756

ODDS AND ENDS

758           void pool_freeallrepos(Pool *pool, int reuseids);
759
760       Free all repos from the pool (including all solvables). If reuseids is
761       true, all Ids of the solvables are free to be reused the next time
762       solvables are created.
763
764           void pool_clear_pos(Pool *pool);
765
766       Clear the data position stored in the pool.
767

ARCHITECTURE POLICIES

769       An architecture policy defines a list of architectures that can be
770       installed on the system, and also the relationship between them (i.e.
771       the ordering). Architectures can be delimited with three different
772       characters:
773
774       ':'
775           No relationship between the architectures. A package of one
776           architecture can not be replaced with one of the other
777           architecture.
778
779       '>'
780           The first architecture is better than the second one. An installed
781           package of the second architecture may be replaced with one from
782           the first architecture and vice versa. The solver will select the
783           better architecture if the versions are the same.
784
785       '='
786           The two architectures are freely exchangeable. Used to define
787           aliases for architectures.
788
789       An example would be 'x86_64:i686=athlon>i586'. This means that x86_64
790       packages can only be replaced by other x86_64 packages, i686 packages
791       can be replaced by i686 and i586 packages (but i686 packages will be
792       preferred) and athlon is another name for the i686 architecture.
793
794       You can turn off the architecture replacement checks with the Solver’s
795       SOLVER_FLAG_ALLOW_ARCHCHANGE flag.
796

VENDOR POLICIES

798       Different vendors often compile packages with different features, so
799       Libsolv only replace installed packages of one vendor with packages
800       coming from the same vendor. Also, while the version of a package is
801       normally defined by the upstream project, the release part of the
802       version is set by the vendor’s package maintainer, so it’s not
803       meaningful to do version comparisons for packages coming from different
804       vendors.
805
806       Vendor in this case means the SOLVABLE_VENDOR string stored in each
807       solvable. Sometimes a vendor changes names, or multiple vendors form a
808       group that coordinate their package building, so libsolv offers a way
809       to define that a group of vendors are compatible. You do that be
810       defining vendor equivalence classes, packages from a vendor from one
811       class may be replaced with packages from all the other vendors in the
812       class.
813
814       There can be multiple equivalence classes, the set of allowed vendor
815       changes for an installed package is calculated by building the union of
816       all of the equivalence classes the vendor of the installed package is
817       part of.
818
819       You can turn off the vendor replacement checks with the Solver’s
820       SOLVER_FLAG_ALLOW_VENDORCHANGE flag.
821

BOOLEAN DEPENDENCIES

823       Boolean Dependencies allow to build complex expressions from simple
824       dependencies. Note that depending on the package manager only a subset
825       of those may be useful. For example, debian currently only allows an
826       "OR" expression.
827
828       REL_OR
829           The expression is true if either the first dependency or the second
830           one is true. This is useful for package dependencies like
831           “Requires”, where you can specify that either one of the packages
832           need to be installed.
833
834       REL_AND
835           The expression is true if both dependencies are true. The packages
836           fulfilling the dependencies may be different, i.e. “Supplements:
837           perl REL_AND python” is true if both a package providing perl and a
838           package providing python are installed.
839
840       REL_WITH
841           The expression is true if both dependencies are true and are
842           fulfilled by the same package. Thus “Supplements: perl REL_WITH
843           python” would only be true if a package is installed that provides
844           both dependencies (some kind of multi-language interpreter).
845
846       REL_COND
847           The expression is true if the first dependency is true or the
848           second dependency is false. “A REL_COND B” is equivalent to “A
849           REL_OR (NOT B)” (except that libsolv does not expose “NOT”).
850
851       REL_UNLESS
852           The expression is true if the first dependency is true and the
853           second dependency is false. “A REL_UNLESS B” is equivalent to “A
854           REL_AND (NOT B)” (except that libsolv does not expose “NOT”).
855
856       REL_ELSE
857           The “else” part of a “REL_COND” or “REL_UNLESS” dependency. It has
858           to be directly in the evr part of the condition, e.g. “foo REL_COND
859           (bar REL_ELSE baz)”. For “REL_COND” this is equivalent to writing
860           “(foo REL_COND bar) REL_AND (bar REL_OR baz)”. For “REL_UNLESS”
861           this is equivalent to writing “(foo REL_UNLESS bar) REL_OR (bar
862           REL_AND baz)”.
863
864       Each sub-dependency of a boolean dependency can in turn be a boolean
865       dependency, so you can chain them to create complex dependencies.
866

NAMESPACE DEPENDENCIES

868       Namespace dependencies can be used to implement dependencies on
869       attributes external to libsolv. An example would be a dependency on the
870       language set by the user. This types of dependencies are usually only
871       used for “Conflicts” or “Supplements” dependencies, as the underlying
872       package manager does not know how to deal with them.
873
874       If the library needs to evaluate a namespace dependency, it calls the
875       namespace callback function set in the pool. The callback function can
876       return a set of packages that “provide” the dependency. If the
877       dependency is provided by the system, the returned set should consist
878       of just the system solvable (Solvable Id 1).
879
880       The returned set of packages must be returned as offset into the
881       whatprovidesdata array. You can use the pool_queuetowhatprovides
882       function to convert a queue into such an offset. To ease programming
883       the callback function, the return values “0” and “1” are not
884       interpreted as an offset. “0” means that no package is in the return
885       set, “1” means that just the system solvable is in the set.
886
887       The returned set is cached, so that for each namespace dependency the
888       callback is just called once. If you need to flush the cache (maybe
889       because the user has selected a different language), use the
890       pool_flush_namespaceproviders() function.
891

AUTHOR

893       Michael Schroeder <mls@suse.de>
894
895
896
897libsolv                           01/21/2020                   LIBSOLV-POOL(3)
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