aboutsummaryrefslogtreecommitdiffstats
path: root/URPM/Resolve.pm
blob: e5aaa180bb271513428225335779ccdbaec15577 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
package URPM;

use strict;

#- find candidates packages from a require string (or id),
#- take care of direct choices using | sepatator.
sub find_candidate_packages {
    my ($urpm, $dep) = @_;
    my %packages;

    foreach (split '\|', $dep) {
	if (/^\d+$/) {
	    my $pkg = $urpm->{depslist}[$_];
	    $pkg->arch eq 'src' || $pkg->is_arch_compat or next;
	    push @{$packages{$pkg->name}}, $pkg;
	} elsif (my ($property, $name) = /^(([^\s\[]*).*)/) {
	    foreach (keys %{$urpm->{provides}{$name} || {}}) {
		my $pkg = $urpm->{depslist}[$_];
		$pkg->is_arch_compat or next;
		#- check if at least one provide of the package overlap the property.
		my $satisfied = 0;
		foreach ($pkg->provides) {
		    ranges_overlap($_, $property) and ++$satisfied, last;
		}
		$satisfied and push @{$packages{$pkg->name}}, $pkg;
	    }
	}
    }
    \%packages;
}

#- return unresolved requires of a package (a new one or a existing one).
sub unsatisfied_requires {
    my ($urpm, $db, $state, $pkg, $name) = @_;
    my %properties;

    #- all requires should be satisfied according to selected package, or installed packages.
    foreach ($pkg->requires) {
	if (my ($n, $s) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*\s*[^\s\]]*)/) {
	    #- allow filtering on a given name (to speed up some search).
	    ! defined $name || $n eq $s or next;

	    #- avoid recomputing the same all the time.
	    exists $properties{$_} || $state->{installed}{$_} and next;

	    #- keep track if satisfied.
	    my $satisfied = 0;
	    #- check on selected package if a provide is satisfying the resolution (need to do the ops).
	    foreach my $sense (keys %{$state->{provided}{$n} || {}}) {
		ranges_overlap($sense, $s) and ++$satisfied, last;
	    }
	    #- check on installed system a package which is not obsoleted is satisfying the require.
	    unless ($satisfied) {
		if ($n =~ /^\//) {
		    $db->traverse_tag('path', [ $n ], sub {
					  my ($p) = @_;
					  exists $state->{obsoleted}{$p->fullname} and return;
					  ++$satisfied;
				      });
		} else {
		    $db->traverse_tag('whatprovides', [ $n ], sub {
					  my ($p) = @_;
					  exists $state->{obsoleted}{$p->fullname} and return;
					  foreach ($p->provides) {
					      $state->{installed}{$_}{$p->fullname} = undef;
					      if (my ($pn, $ps) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*\s*[^\s\]]*)/) {
						  $pn eq $n or next;
						  ranges_overlap($ps, $s) and ++$satisfied;
					      }
					  }
				      });
		}
	    }
	    #- if nothing can be done, the require should be resolved.
	    $satisfied or $properties{$_} = undef;
	}
    }
    keys %properties;
}

#- resolve requested, keep resolution state to speed process.
#- a requested package is marked to be installed, once done, a upgrade flag or
#- installed flag is set according to needs of package.
#- other required package will have required flag set along with upgrade flag or
#- installed flag.
#- base flag should always been installed or upgraded.
#- the following options are recognized :
#-   check : check requires of installed packages.
sub resolve_requested {
    my ($urpm, $db, $state, %options) = @_;
    my (@properties, %requested, $dep);

    #- for each dep property evaluated, examine which package will be obsoleted on $db,
    #- then examine provides that will be removed (which need to be satisfied by another
    #- package present or by a new package to upgrade), then requires not satisfied and
    #- finally conflicts that will force a new upgrade or a remove.
    @properties = keys %{$state->{requested}};
    foreach my $dep (@properties) {
	foreach (split '\|', $dep) {
	    $requested{$_} = $state->{requested}{$dep};
	}
    }
    while (defined ($dep = shift @properties)) {
	my (@chosen_requested, @chosen_upgrade, @chosen, %diff_provides, $pkg);
	#- take the best package for each choices of same name.
	my $packages = $urpm->find_candidate_packages($dep);
	foreach (values %$packages) {
	    my $best;
	    foreach (@$_) {
		if ($best && $best != $_) {
		    $_->compare_pkg($best) > 0 and $best = $_;
		} else {
		    $best = $_;
		}
	    }
	    $_ = $best;
	}
	if (keys(%$packages) > 1) {
	    #- package should be prefered if one of their provides is referenced
	    #- in requested hash or package itself is requested (or required).
	    #- if there is no preference choose the first one (higher probability
	    #- of being chosen) by default and ask user.
	    foreach my $p (values %$packages) {
		$p or next; #- this could happen if no package are suitable for this arch.
		exists $state->{obsoleted}{$p->fullname} and next; #- avoid taking what is removed (incomplete).
		exists $state->{selected}{$p->id} and $pkg = $p, last; #- already selected package is taken.
		if (exists $requested{$p->id}) {
		    push @chosen_requested, $p;
		} elsif ($db->traverse_tag('name', [ $p->name ], undef) > 0) {
		    push @chosen_upgrade, $p;
		} else {
		    push @chosen, $p;
		}
	    }
	    @chosen_requested > 0 and @chosen = @chosen_requested;
	    @chosen_requested == 0 and @chosen_upgrade > 0 and @chosen = @chosen_upgrade;
	} else {
	    @chosen = values %$packages;
	}
	if (!$pkg && $options{callback_choices} && @chosen > 1) {
	    $pkg = $options{callback_choices}->($urpm, $db, $state, \@chosen);
	    $pkg or next; #- callback may decide to not continue (or state is already updated).
	}
	$pkg ||= $chosen[0];
	$pkg && !$pkg->flag_requested && !$pkg->flag_required or next;

	#- keep in mind the package has be selected.
	$pkg->set_flag_requested($state->{selected}{$pkg->id} = delete $requested{$dep});
	$pkg->set_flag_required(!$pkg->flag_requested);

	#- check if package is not already installed before trying to use it, compute
	#- obsoleted package too. this is valable only for non source package.
	if ($pkg->arch ne 'src') {
	    $pkg->flag_installed and delete $state->{selected}{$pkg->id}, next;
	    unless ($pkg->flag_upgrade) {
		$db->traverse_tag('name', [ $pkg->name ], sub {
				      my ($p) = @_;
				      $pkg->flag_installed or
					$pkg->set_flag_installed($pkg->compare_pkg($p) <= 0);
				  });
		$pkg->set_flag_upgrade(!$pkg->flag_installed);
	    }
	    $pkg->flag_installed and delete $state->{selected}{$pkg->id}, next;

	    #- keep in mind the provides of this package, so that future requires can be satisfied
	    #- with this package potentially.
	    foreach ($pkg->provides) {
		if (my ($n, $s) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*\s*[^\s\]]*)/) {
		    $state->{provided}{$n}{$s}{$pkg->id} = undef;
		}
	    }

	    foreach ($pkg->name, $pkg->obsoletes) {
		if (my ($n, $o, $v) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*)\s*([^\s\]]*)/) {
		    $db->traverse_tag('name', [ $n ], sub {
					  my ($p) = @_;
					  !$o || eval($p->compare($v) . $o . 0) or return;

					  $state->{obsoleted}{$p->fullname}{$pkg->id} = undef;

					  foreach ($p->provides) {
					      #- clean installed property.
					      if (my ($ip) = $state->{installed}{$_}) {
						  delete $ip->{$p->fullname};
						  %$ip or delete $state->{installed}{$_};
					      }
					      #- check differential provides between obsoleted package and newer one.
					      if (my ($pn, $ps) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*\s*[^\s\]]*)/) {
						  ($state->{provided}{$pn} || {})->{$ps} or $diff_provides{$n} = undef;
					      }
					  }
				      });
		}
	    }

	    foreach my $n (keys %diff_provides) {
		$db->traverse_tag('whatrequires', [ $n ], sub {
				      my ($p) = @_;
				      if (my @l = $urpm->unsatisfied_requires($db, $state, $p)) {
					  #- try if upgrading the package will be satisfying all the requires
					  #- else it will be necessary to ask hte user for removing it.
					  my $packages = $urpm->find_candidate_packages($p->name);
					  my $best;
					  foreach (grep { $urpm->unsatisfied_requires($db, $state, $_, $n) == 0 }
						   @{$packages->{$p->name}}) {
					      if ($best && $best != $_) {
						  $_->compare_pkg($best) > 0 and $best = $_;
					      } else {
						  $best = $_;
					      }
					  }
					  if ($best) {
					      push @properties, $best->id;
					  } else {
					      #- no package have been found, we need to remove the package examined.
					      push @{$state->{ask_remove}{join '-', ($p->fullname)[0..2]}},
						{ unsatisfied => \@l, pkg => $pkg };
					  }
				      }
				  });
	    }
	}

	#- all requires should be satisfied according to selected package, or installed packages.
	push @properties, $urpm->unsatisfied_requires($db, $state, $pkg);

	#- examine conflicts, an existing package conflicting with this selection should
	#- be upgraded to a new version which will be safe, else it should be removed.
	foreach ($pkg->conflicts) {
	    if (my ($file) = /^(\/[^\s\[]*)/) {
		$db->traverse_tag('path', [ $file ], sub {
				      my ($p) = @_;
				      $state->{conflicts}{$p->fullname}{$pkg->id} = undef;
				      #- all these packages should be removed.
				      push @{$state->{ask_remove}{join '-', ($p->fullname)[0..2]}}, 
					{ conflicts => $file, pkg => $pkg };
				  });
	    } elsif (my ($property, $name) = /^(([^\s\[]*).*)/) {
		$db->traverse_tag('whatprovides', [ $name ], sub {
				      my ($p) = @_;
				      if (grep { ranges_overlap($_, $property) } $p->provides) {
					  #- the existing package will conflicts with selection, check if a newer
					  #- version will be ok, else ask to remove the old.
					  my $packages = $urpm->find_candidate_packages($p->name);
					  my $best;
					  foreach (@{$packages->{$p->name}}) {
					      unless (grep { ranges_overlap($_, $property) } $_->provides) {
						  if ($best && $best != $_) {
						      $_->compare_pkg($best) > 0 and $best = $_;
						  } else {
						      $best = $_;
						  }
					      }
					  }
					  if ($best) {
					      push @properties, $best->id;
					  } else {
					      #- no package have been found, we need to remove the package examined.
					      push @{$state->{ask_remove}{join '-', ($p->fullname)[0..2]}},
						{ conflicts => $property, pkg => $pkg };
					  }
				      }
				  });
	    }
	    #- we need to check a selected package is not selected.
	    #- if true, it should be unselected.
	    if (my ($name) =~ /^([^\s\[]*)/) {
		foreach (keys %{$urpm->{provides}{$name} || {}}) {
		    my $p = $urpm->{depslist}[$_];
		    $pkg->flag_selected and $state->{ask_unselect}{$p->id}{$pkg->id};
		}
	    }
	}
    }

    #- obsoleted packages are no longer marked as being asked to be removed.
    delete @{$state->{ask_remove}}{map { /(.*)\.[^\.]*$/ && $1 } keys %{$state->{obsoleted}}};
}

#- compute installed flags for all package in depslist.
sub compute_installed_flags {
    my ($urpm, $db) = @_;

    #- first pass check according existing package.
    $db->traverse(sub {
		      my ($p) = @_;
		      foreach (keys %{$urpm->{provides}{$p->name} || {}}) {
			  my $pkg = $urpm->{depslist}[$_];
			  $pkg->name eq $p->name or next;
			  #- compute only installed and upgrade flags.
			  $pkg->set_flag_installed($pkg->compare_pkg($p) <= 0);
			  $pkg->set_flag_upgrade(!$pkg->flag_installed);
		      }
		  });

    #- second pass allow not installed package to be seen as upgrade.
    foreach (@{$urpm->{depslist}}) {
	$_->flag_upgrade || $_->flag_installed and next;
	$_->set_flag_upgrade(1);
    }
}

#- select packages to upgrade, according to package already registered.
#- by default, only takes best package and its obsoleted and compute
#- all installed or upgrade flag.
sub resolve_packages_to_upgrade {
    my ($urpm, $db, $state, %options) = @_;
    my (%names, %skip, %obsoletes);

    #- build direct access to best package according to name.
    foreach (@{$urpm->{depslist}}) {
	if ($_->is_arch_compat) {
	    my $p = $names{$_->name};
	    if ($p) {
		if ($_->compare_pkg($p) > 0) {
		    $names{$_->name} = $_;
		}
	    } else {
		$names{$_->name} = $_;
	    }
	}
    }

    #- check consistency with obsoletes of eligible package.
    #- it is important not to select a package wich obsolete
    #- an old one.
    foreach my $pkg (values %names) {
	foreach ($pkg->obsoletes) {
	    if (my ($n, $o, $v) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*)\s*([^\s\]]*)/) {
		if ($names{$n} && (!$o || eval($names{$n}->compare($v) . $o . 0))) {
		    #- an existing best package is obsoleted by another one.
		    $skip{$n} = undef;
		}
		push @{$obsoletes{$n}}, $pkg;
	    }
	}
    }

    #- now we can examine all existing packages to find packages to upgrade.
    $db->traverse(sub {
		      my ($p) = @_;
		      #- first try with package using the same name.
		      #- this will avoid selecting all packages obsoleting an old one.
		      if (my $pkg = $names{$p->name}) {
			  if ($pkg->compare_pkg($p) <= 0) {
			      #- this means the package is already installed (or there
			      #- is a old version in depslist).
			      $pkg->set_flag_installed(1);
			      $pkg->set_flag_upgrade(0);
			  } else {
			      #- the depslist version is better than existing one.
			      $pkg->set_flag_installed(0);
			      $pkg->set_flag_upgrade(1);
			      $state->{requested}{$pkg->id} = $options{requested};
			      return;
			  }
		      }

		      #- check provides of existing package to see if a obsolete
		      #- may allow selecting it.
		      foreach my $property ($p->provides) {
			  #- only real provides should be taken into account, this means internal obsoletes
			  #- should be avoided.
			  unless (grep { ranges_overlap($property, $_) } $p->obsoletes) {
			      if (my ($n) = $property =~ /^([^\s\[]*)/) {
				  foreach my $pkg (@{$obsoletes{$n} || []}) {
				      next if $pkg->name eq $p->name || $p->name ne $n;
				      foreach ($pkg->obsoletes) {
					  if (ranges_overlap($property, $_)) {
					      #- the package being examined can be obsoleted.
					      #- do not set installed and provides flags.
					      $state->{requested}{$pkg->id} = $options{requested};
					      return;
					  }
				      }
				  }
			      }
			  }
		      }
		  });

    #TODO is conflicts for selection of package, it is important to choose
    #TODO right package to install.
}

1;