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1 swift 1.18 <?xml version='1.0' encoding='UTF-8'?>
2     <!DOCTYPE sections SYSTEM "/dtd/book.dtd">
3    
4 swift 1.1 <!-- The content of this document is licensed under the CC-BY-SA license -->
5 fox2mike 1.55 <!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
6 swift 1.1
7 jkt 1.67 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-working-portage.xml,v 1.66 2007/11/01 01:02:41 yoswink Exp $ -->
8 swift 1.1
9     <sections>
10 swift 1.43
11 neysx 1.60 <abstract>
12     This chapter explains the "simple" steps a user definitely needs to know to
13     maintain the software on his system.
14     </abstract>
15    
16 yoswink 1.66 <version>1.60</version>
17     <date>2007-11-01</date>
18 swift 1.43
19 swift 1.1 <section>
20 swift 1.39 <title>Welcome to Portage</title>
21 swift 1.1 <body>
22    
23 swift 1.2 <p>
24 swift 1.39 Portage is probably Gentoo's most notable innovation in software management.
25     With its high flexibility and enormous amount of features it is frequently seen
26     as the best software management tool available for Linux.
27 swift 1.2 </p>
28    
29     <p>
30 swift 1.39 Portage is completely written in <uri link="http://www.python.org">Python</uri>
31     and <uri link="http://www.gnu.org/software/bash">Bash</uri> and therefore fully
32     visible to the users as both are scripting languages.
33 swift 1.2 </p>
34    
35     <p>
36 swift 1.39 Most users will work with Portage through the <c>emerge</c> tool. This chapter
37     is not meant to duplicate the information available from the emerge man page.
38     For a complete rundown of emerge's options, please consult the man page:
39 swift 1.2 </p>
40    
41 swift 1.39 <pre caption="Reading the emerge man page">
42     $ <i>man emerge</i>
43 swift 1.2 </pre>
44    
45     </body>
46 swift 1.1 </section>
47     <section>
48 swift 1.39 <title>The Portage Tree</title>
49 swift 1.1 <subsection>
50 swift 1.39 <title>Ebuilds</title>
51 swift 1.2 <body>
52    
53     <p>
54 swift 1.39 When we talk about packages, we often mean software titles that are available to
55     the Gentoo users through the Portage tree. The Portage tree is a collection of
56     <e>ebuilds</e>, files that contain all information Portage needs to maintain
57     software (install, search, query, ...). These ebuilds reside in
58     <path>/usr/portage</path> by default.
59 swift 1.2 </p>
60    
61     <p>
62 swift 1.39 Whenever you ask Portage to perform some action regarding software titles, it
63     will use the ebuilds on your system as a base. It is therefore important that
64     you regularly update the ebuilds on your system so Portage knows about new
65     software, security updates, etc.
66 swift 1.2 </p>
67    
68     </body>
69     </subsection>
70     <subsection>
71 swift 1.39 <title>Updating the Portage Tree</title>
72 swift 1.1 <body>
73 swift 1.2
74     <p>
75 swift 1.39 The Portage tree is usually updated with <uri
76 yoswink 1.50 link="http://rsync.samba.org/">rsync</uri>, a fast incremental file transfer
77 swift 1.39 utility. Updating is fairly simple as the <c>emerge</c> command provides a
78     front-end for rsync:
79 swift 1.2 </p>
80    
81 swift 1.39 <pre caption="Updating the Portage tree">
82 cam 1.38 # <i>emerge --sync</i>
83 swift 1.2 </pre>
84    
85     <p>
86 swift 1.39 If you are unable to rsync due to firewall restrictions you can still update
87 swift 1.40 your Portage tree by using our daily generated Portage tree snapshots. The
88 swift 1.39 <c>emerge-webrsync</c> tool automatically fetches and installs the latest
89     snapshot on your system:
90 swift 1.2 </p>
91    
92 swift 1.39 <pre caption="Running emerge-webrsync">
93 swift 1.2 # <i>emerge-webrsync</i>
94     </pre>
95 swift 1.1
96     </body>
97     </subsection>
98     </section>
99     <section>
100     <title>Maintaining Software</title>
101     <subsection>
102 swift 1.39 <title>Searching for Software</title>
103 swift 1.1 <body>
104    
105 swift 1.3 <p>
106 swift 1.39 To search through the Portage tree after software titles, you can use
107 cam 1.47 <c>emerge</c> built-in search capabilities. By default, <c>emerge --search</c>
108 neysx 1.42 returns the names of packages whose title matches (either fully or partially)
109 swift 1.39 the given search term.
110 swift 1.3 </p>
111    
112     <p>
113 swift 1.39 For instance, to search for all packages who have "pdf" in their name:
114 swift 1.3 </p>
115    
116 swift 1.39 <pre caption="Searching for pdf-named packages">
117 cam 1.47 $ <i>emerge --search pdf</i>
118 swift 1.39 </pre>
119    
120 swift 1.3 <p>
121 swift 1.39 If you want to search through the descriptions as well you can use the
122     <c>--searchdesc</c> (or <c>-S</c>) switch:
123 swift 1.3 </p>
124    
125 swift 1.39 <pre caption="Searching for pdf-related packages">
126     $ <i>emerge --searchdesc pdf</i>
127     </pre>
128    
129 swift 1.3 <p>
130 swift 1.39 When you take a look at the output, you'll notice that it gives you a lot of
131     information. The fields are clearly labelled so we won't go further into their
132     meanings:
133 swift 1.3 </p>
134    
135 swift 1.49 <pre caption="Example 'emerge --search' output">
136 swift 1.39 * net-print/cups-pdf
137     Latest version available: 1.5.2
138     Latest version installed: [ Not Installed ]
139     Size of downloaded files: 15 kB
140     Homepage: http://cip.physik.uni-wuerzburg.de/~vrbehr/cups-pdf/
141     Description: Provides a virtual printer for CUPS to produce PDF files.
142     License: GPL-2
143     </pre>
144    
145 swift 1.3 </body>
146     </subsection>
147     <subsection>
148 swift 1.39 <title>Installing Software</title>
149 swift 1.3 <body>
150    
151     <p>
152 swift 1.39 Once you've found a software title to your liking, you can easily install it
153     with <c>emerge</c>: just add the package name. For instance, to install
154 swift 1.3 <c>gnumeric</c>:
155     </p>
156    
157 swift 1.39 <pre caption="Installing gnumeric">
158 swift 1.3 # <i>emerge gnumeric</i>
159     </pre>
160    
161     <p>
162 swift 1.39 Since many applications depend on each other, any attempt to install a certain
163     software package might result in the installation of several dependencies as
164     well. Don't worry, Portage handles dependencies well. If you want to find out
165     what Portage <e>would</e> install when you ask it to install a certain package,
166     add the <c>--pretend</c> switch. For instance:
167 swift 1.3 </p>
168    
169 swift 1.39 <pre caption="Pretend to install gnumeric">
170 swift 1.3 # <i>emerge --pretend gnumeric</i>
171     </pre>
172    
173     <p>
174 swift 1.39 When you ask Portage to install a package, it will download the necessary source
175     code from the internet (if necessary) and store it by default in
176     <path>/usr/portage/distfiles</path>. After this it will unpack, compile and
177     install the package. If you want Portage to only download the sources without
178     installing them, add the <c>--fetchonly</c> option to the <c>emerge</c> command:
179 swift 1.3 </p>
180    
181 swift 1.39 <pre caption="Download the sourcecode for gnumeric">
182 swift 1.3 # <i>emerge --fetchonly gnumeric</i>
183     </pre>
184    
185     </body>
186     </subsection>
187     <subsection>
188 neysx 1.52 <title>Finding Installed Package Documentation</title>
189     <body>
190    
191     <p>
192     Many packages come with their own documentation. Sometimes, the <c>doc</c> USE
193     flag determines whether the package documentation should be installed or not.
194     You can check the existence of a <c>doc</c> USE flag with the <c>emerge -vp
195     &lt;package name&gt;</c> command.
196     </p>
197    
198     <pre caption="Checking the existence of a doc USE flag">
199     <comment>(alsa-lib is just an example, of course.)</comment>
200     # <i>emerge -vp alsa-lib</i>
201 nightmorph 1.62 [ebuild N ] media-libs/alsa-lib-1.0.14_rc1 -debug +doc 698 kB
202 neysx 1.52 </pre>
203    
204     <p>
205 jkt 1.67 The best way of enabling the <c>doc</c> USE flag is doing it on a per-package
206     basis via the <path>/etc/portage/package.use</path> file, so that you get
207     documentation only for packages that you are interested in. Enabling this flag
208     globally is known to cause problems with circular dependencies. For more
209     information, please read the <uri link="?part=2&amp;chap=2">USE Flags</uri>
210     chapter.
211 neysx 1.52 </p>
212    
213     <p>
214     Once the package installed, its documentation is generally found in a
215     subdirectory named after the package under the <path>/usr/share/doc</path>
216     directory. You can also list all installed files with the <c>equery</c> tool
217     which is part of the <c>app-portage/gentoolkit</c> <uri
218     link="/doc/en/gentoolkit.xml">package</uri>.
219     </p>
220    
221     <pre caption="Locating package documentation">
222 nightmorph 1.62 # <i>ls -l /usr/share/doc/alsa-lib-1.0.14_rc1</i>
223 neysx 1.52 total 28
224     -rw-r--r-- 1 root root 669 May 17 21:54 ChangeLog.gz
225     -rw-r--r-- 1 root root 9373 May 17 21:54 COPYING.gz
226     drwxr-xr-x 2 root root 8560 May 17 21:54 html
227     -rw-r--r-- 1 root root 196 May 17 21:54 TODO.gz
228    
229     <comment>(Alternatively, use equery to locate interesting files:)</comment>
230     # <i>equery files alsa-lib | less</i>
231 nightmorph 1.62 media-libs/alsa-lib-1.0.14_rc1
232     * Contents of media-libs/alsa-lib-1.0.14_rc1:
233 neysx 1.52 /usr
234     /usr/bin
235     /usr/bin/alsalisp
236 neysx 1.53 <comment>(Output truncated)</comment>
237 neysx 1.52 </pre>
238    
239     </body>
240     </subsection>
241     <subsection>
242 swift 1.39 <title>Removing Software</title>
243 swift 1.3 <body>
244    
245     <p>
246 swift 1.39 When you want to remove a software package from your system, use <c>emerge
247 cam 1.47 --unmerge</c>. This will tell Portage to remove all files installed by that
248 swift 1.39 package from your system <e>except</e> the configuration files of that
249     application if you have altered those after the installation. Leaving the
250     configuration files allows you to continue working with the package if you ever
251     decide to install it again.
252 swift 1.3 </p>
253    
254     <p>
255 swift 1.39 However, a <brite>big warning</brite> applies: Portage will <e>not</e> check if
256     the package you want to remove is required by another package. It will however
257     warn you when you want to remove an important package that breaks your system
258     if you unmerge it.
259 swift 1.3 </p>
260    
261 swift 1.39 <pre caption="Removing gnumeric from the system">
262 cam 1.47 # <i>emerge --unmerge gnumeric</i>
263 swift 1.3 </pre>
264    
265     <p>
266 swift 1.39 When you remove a package from your system, the dependencies of that package
267     that were installed automatically when you installed the software are left. To
268     have Portage locate all dependencies that can now be removed, use
269 cam 1.47 <c>emerge</c>'s <c>--depclean</c> functionality. We will talk about this later
270     on.
271 swift 1.3 </p>
272    
273 swift 1.39 </body>
274     </subsection>
275     <subsection>
276     <title>Updating your System</title>
277     <body>
278 swift 1.32
279 swift 1.3 <p>
280 swift 1.39 To keep your system in perfect shape (and not to mention install the latest
281     security updates) you need to update your system regularly. Since Portage only
282     checks the ebuilds in your Portage tree you first have to update your Portage
283     tree. When your Portage tree is updated, you can update your system with
284 swift 1.57 <c>emerge --update world</c>. In the next example, we'll also use the
285     <c>--ask</c> switch which will tell Portage to display the list of packages it
286     wants to upgrade and ask you if you want to continue:
287 swift 1.3 </p>
288    
289 swift 1.39 <pre caption="Updating your system">
290 swift 1.57 # <i>emerge --update --ask world</i>
291 swift 1.3 </pre>
292    
293     <p>
294 swift 1.39 Portage will then search for newer version of the applications you have
295     installed. However, it will only verify the versions for the applications you
296 nightmorph 1.61 have <e>explicitly</e> installed (the applications listed in
297     <path>/var/lib/portage/world</path>) - it does not thoroughly check their
298     dependencies. If you want to update <e>every single package</e> on your system,
299     add the <c>--deep</c> argument:
300 swift 1.3 </p>
301    
302 swift 1.39 <pre caption="Updating your entire system">
303     # <i>emerge --update --deep world</i>
304 swift 1.3 </pre>
305    
306     <p>
307 swift 1.54 Since security updates also happen in packages you have not explicitly installed
308     on your system (but that are pulled in as dependencies of other programs), it
309     is recommended to run this command once in a while.
310     </p>
311    
312     <p>
313 swift 1.39 If you have altered any of your <uri link="?part=2&amp;chap=2">USE flags</uri>
314     lately you might want to add <c>--newuse</c> as well. Portage will then verify
315     if the change requires the installation of new packages or recompilation of
316     existing ones:
317 swift 1.3 </p>
318    
319 swift 1.39 <pre caption="Performing a full update">
320     # <i>emerge --update --deep --newuse world</i>
321 swift 1.3 </pre>
322    
323 swift 1.1 </body>
324     </subsection>
325     <subsection>
326 neysx 1.51 <title>Metapackages</title>
327 swift 1.11 <body>
328    
329     <p>
330 swift 1.39 Some packages in the Portage tree don't have any real content but are used to
331     install a collection of packages. For instance, the <c>kde</c> package will
332     install a complete KDE environment on your system by pulling in various
333     KDE-related packages as dependencies.
334 swift 1.11 </p>
335    
336     <p>
337 swift 1.39 If you ever want to remove such a package from your system, running <c>emerge
338 cam 1.47 --unmerge</c> on the package won't have much effect as the dependencies remain
339     on the system.
340 swift 1.11 </p>
341    
342     <p>
343 swift 1.39 Portage has the functionality to remove orphaned dependencies as well, but since
344     the availability of software is dynamically dependent you first need to update
345     your entire system fully, including the new changes you applied when changing
346 cam 1.47 USE flags. After this you can run <c>emerge --depclean</c> to remove the
347     orphaned dependencies. When this is done, you need to rebuild the applications
348     that were dynamically linked to the now-removed software titles but don't
349     require them anymore.
350 swift 1.11 </p>
351    
352     <p>
353 swift 1.39 All this is handled with the following three commands:
354 swift 1.11 </p>
355    
356 swift 1.39 <pre caption="Removing orphaned dependencies">
357     # <i>emerge --update --deep --newuse world</i>
358 cam 1.47 # <i>emerge --depclean</i>
359 swift 1.39 # <i>revdep-rebuild</i>
360 swift 1.11 </pre>
361    
362 swift 1.34 <p>
363 swift 1.39 <c>revdep-rebuild</c> is provided by the <c>gentoolkit</c> package; don't forget
364     to emerge it first:
365 swift 1.34 </p>
366    
367 swift 1.39 <pre caption="Installing the gentoolkit package">
368     # <i>emerge gentoolkit</i>
369 swift 1.34 </pre>
370    
371 swift 1.11 </body>
372     </subsection>
373 swift 1.39 </section>
374     <section>
375     <title>When Portage is Complaining...</title>
376 swift 1.11 <subsection>
377 swift 1.39 <title>About SLOTs, Virtuals, Branches, Architectures and Profiles</title>
378 swift 1.1 <body>
379    
380 swift 1.3 <p>
381 swift 1.39 As we stated before, Portage is extremely powerful and supports many features
382     that other software management tools lack. To understand this, we explain a few
383 neysx 1.46 aspects of Portage without going into too much detail.
384 swift 1.3 </p>
385    
386     <p>
387 swift 1.39 With Portage different versions of a single package can coexist on a system.
388     While other distributions tend to name their package to those versions (like
389     <c>freetype</c> and <c>freetype2</c>) Portage uses a technology called
390     <e>SLOT</e>s. An ebuild declares a certain SLOT for its version. Ebuilds with
391     different SLOTs can coexist on the same system. For instance, the
392     <c>freetype</c> package has ebuilds with <c>SLOT="1"</c> and <c>SLOT="2"</c>.
393 swift 1.3 </p>
394    
395     <p>
396 swift 1.39 There are also packages that provide the same functionality but are implemented
397     differently. For instance, <c>metalogd</c>, <c>sysklogd</c> and <c>syslog-ng</c>
398     are all system loggers. Applications that rely on the availability of "a system
399     logger" cannot depend on, for instance, <c>metalogd</c>, as the other system
400     loggers are as good a choice as any. Portage allows for <e>virtuals</e>: each
401     system logger provides <c>virtual/syslog</c> so that applications can depend on
402     <c>virtual/syslog</c>.
403 swift 1.3 </p>
404    
405     <p>
406 swift 1.39 Software in the Portage tree can reside in different branches. By default your
407     system only accepts packages that Gentoo deems stable. Most new software titles,
408     when committed, are added to the testing branch, meaning more testing needs to
409     be done before it is marked as stable. Although you will see the ebuilds for
410     those software in the Portage tree, Portage will not update them before they are
411     placed in the stable branch.
412 swift 1.3 </p>
413    
414     <p>
415 swift 1.39 Some software is only available for a few architectures. Or the software doesn't
416     work on the other architectures, or it needs more testing, or the developer that
417     committed the software to the Portage tree is unable to verify if the package
418     works on different architectures.
419 swift 1.25 </p>
420    
421     <p>
422 swift 1.39 Each Gentoo installation adheres to a certain <c>profile</c> which contains,
423     amongst other information, the list of packages that are required for a system
424     to function normally.
425 swift 1.3 </p>
426    
427 swift 1.1 </body>
428     </subsection>
429 swift 1.39 <subsection id="blocked">
430     <title>Blocked Packages</title>
431 swift 1.1 <body>
432    
433 swift 1.39 <pre caption="Portage warning about blocked packages (with --pretend)">
434 fox2mike 1.55 [blocks B ] mail-mta/ssmtp (is blocking mail-mta/postfix-2.2.2-r1)
435 swift 1.39 </pre>
436 swift 1.3
437 swift 1.39 <pre caption="Portage warning about blocked packages (without --pretend)">
438 fox2mike 1.55 !!! Error: the mail-mta/postfix package conflicts with another package.
439 swift 1.39 !!! both can't be installed on the same system together.
440     !!! Please use 'emerge --pretend' to determine blockers.
441 swift 1.3 </pre>
442    
443     <p>
444 swift 1.41 Ebuilds contain specific fields that inform Portage about its dependencies.
445 swift 1.39 There are two possible dependencies: build dependencies, declared in
446     <c>DEPEND</c> and run-time dependencies, declared in <c>RDEPEND</c>. When one of
447     these dependencies explicitly marks a package or virtual as being <e>not</e>
448     compatible, it triggers a blockage.
449 swift 1.3 </p>
450    
451 swift 1.11 <p>
452 swift 1.39 To fix a blockage, you can choose to not install the package or unmerge the
453     conflicting package first. In the given example, you can opt not to install
454 fox2mike 1.55 <c>postfix</c> or to remove <c>ssmtp</c> first.
455 swift 1.11 </p>
456    
457 swift 1.56 <p>
458 nightmorph 1.63 You may also see blocking packages with specific atoms, such as
459     <b>&lt;</b>media-video/mplayer-bin-1.0_rc1-r2. In this case, updating to a more
460     recent version of the blocking package would remove the block.
461     </p>
462    
463     <p>
464 swift 1.56 It is also possible that two packages that are yet to be installed are blocking
465     each other. In this rare case, you should find out why you need to install both.
466     In most cases you can do with one of the packages alone. If not, please file a
467     bug on <uri link="http://bugs.gentoo.org">Gentoo's bugtracking system</uri>.
468     </p>
469    
470 swift 1.1 </body>
471     </subsection>
472 swift 1.39 <subsection id="masked">
473     <title>Masked Packages</title>
474 swift 1.1 <body>
475    
476 swift 1.39 <pre caption="Portage warning about masked packages">
477     !!! all ebuilds that could satisfy "bootsplash" have been masked.
478     </pre>
479    
480     <pre caption="Portage warning about masked packages - reason">
481     !!! possible candidates are:
482 swift 1.3
483 swift 1.39 - gnome-base/gnome-2.8.0_pre1 (masked by: <i>~x86 keyword</i>)
484     - lm-sensors/lm-sensors-2.8.7 (masked by: <i>-sparc keyword</i>)
485     - sys-libs/glibc-2.3.4.20040808 (masked by: <i>-* keyword</i>)
486     - dev-util/cvsd-1.0.2 (masked by: <i>missing keyword</i>)
487 nightmorph 1.64 - games-fps/unreal-tournament-451 (masked by: <i>package.mask</i>)
488 swift 1.39 - sys-libs/glibc-2.3.2-r11 (masked by: <i>profile</i>)
489 swift 1.35 </pre>
490    
491 swift 1.3 <p>
492 swift 1.39 When you want to install a package that isn't available for your system, you
493     will receive this masking error. You should try installing a different
494     application that is available for your system or wait until the package is put
495     available. There is always a reason why a package is masked:
496 swift 1.3 </p>
497    
498 swift 1.35 <ul>
499     <li>
500 swift 1.39 <b>~arch keyword</b> means that the application is not tested sufficiently
501     to be put in the stable branch. Wait a few days or weeks and try again.
502 swift 1.35 </li>
503     <li>
504 swift 1.39 <b>-arch keyword</b> or <b>-* keyword</b> means that the application does
505     not work on your architecture. If you believe the package does work file
506     a bug at our <uri link="http://bugs.gentoo.org">bugzilla</uri> website.
507 swift 1.35 </li>
508     <li>
509 swift 1.39 <b>missing keyword</b> means that the application has not been tested on
510     your architecture yet. Ask the architecture porting team to test the package
511     or test it for them and report your findings on our <uri
512     link="http://bugs.gentoo.org">bugzilla</uri> website.
513 swift 1.35 </li>
514     <li>
515 swift 1.39 <b>package.mask</b> means that the package has been found corrupt, unstable
516     or worse and has been deliberately marked as do-not-use.
517 swift 1.35 </li>
518     <li>
519 swift 1.39 <b>profile</b> means that the package has been found not suitable for your
520     profile. The application might break your system if you installed it or is
521     just not compatible with the profile you use.
522 swift 1.35 </li>
523     </ul>
524    
525 swift 1.1 </body>
526     </subsection>
527 swift 1.39 <subsection id="missingdependencies">
528     <title>Missing Dependencies</title>
529 swift 1.1 <body>
530    
531 swift 1.39 <pre caption="Portage warning about missing dependency">
532 neysx 1.48 emerge: there are no ebuilds to satisfy "&gt;=sys-devel/gcc-3.4.2-r4".
533 swift 1.3
534 swift 1.39 !!! Problem with ebuild sys-devel/gcc-3.4.2-r2
535     !!! Possibly a DEPEND/*DEPEND problem.
536 swift 1.3 </pre>
537    
538     <p>
539 swift 1.39 The application you are trying to install depends on another package that is not
540     available for your system. Please check <uri
541     link="http://bugs.gentoo.org">bugzilla</uri> if the issue is known and if not,
542     please report it. Unless you are mixing branches this should not occur and is
543     therefore a bug.
544 swift 1.3 </p>
545    
546 swift 1.39 </body>
547     </subsection>
548     <subsection id="ambiguousebuild">
549     <title>Ambiguous Ebuild Name</title>
550     <body>
551 swift 1.3
552 swift 1.39 <pre caption="Portage warning about ambiguous ebuild names">
553     !!! The short ebuild name "aterm" is ambiguous. Please specify
554     !!! one of the following fully-qualified ebuild names instead:
555 swift 1.35
556 swift 1.39 dev-libs/aterm
557     x11-terms/aterm
558 swift 1.3 </pre>
559    
560     <p>
561 swift 1.39 The application you want to install has a name that corresponds with more than
562     one package. You need to supply the category name as well. Portage will inform
563     you of possible matches to choose from.
564 swift 1.35 </p>
565    
566 swift 1.39 </body>
567     </subsection>
568     <subsection id="circulardependencies">
569     <title>Circular Dependencies</title>
570     <body>
571 swift 1.35
572 swift 1.39 <pre caption="Portage warning about circular dependencies">
573     !!! Error: circular dependencies:
574 swift 1.35
575 swift 1.39 ebuild / net-print/cups-1.1.15-r2 depends on ebuild / app-text/ghostscript-7.05.3-r1
576     ebuild / app-text/ghostscript-7.05.3-r1 depends on ebuild / net-print/cups-1.1.15-r2
577 swift 1.35 </pre>
578    
579     <p>
580 swift 1.39 Two (or more) packages you want to install depend on each other and can
581     therefore not be installed. This is most likely a bug in the Portage tree.
582     Please resync after a while and try again. You can also check <uri
583     link="http://bugs.gentoo.org">bugzilla</uri> if the issue is known and if not,
584     report it.
585 swift 1.3 </p>
586    
587 swift 1.39 </body>
588     </subsection>
589     <subsection id="fetchfailed">
590     <title>Fetch failed</title>
591     <body>
592 swift 1.29
593 swift 1.39 <pre caption="Portage warning about fetch failed">
594     !!! Fetch failed for sys-libs/ncurses-5.4-r5, continuing...
595     <comment>(...)</comment>
596     !!! Some fetch errors were encountered. Please see above for details.
597 swift 1.3 </pre>
598    
599 swift 1.35 <p>
600 swift 1.39 Portage was unable to download the sources for the given application and will
601     try to continue installing the other applications (if applicable). This failure
602     can be due to a mirror that has not synchronised correctly or because the ebuild
603     points to an incorrect location. The server where the sources reside can also be
604     down for some reason.
605 swift 1.35 </p>
606    
607     <p>
608 swift 1.39 Retry after one hour to see if the issue still persists.
609 swift 1.35 </p>
610    
611 swift 1.1 </body>
612     </subsection>
613 swift 1.39 <subsection id="profileprotect">
614     <title>System Profile Protection</title>
615 swift 1.1 <body>
616 swift 1.3
617 swift 1.39 <pre caption="Portage warning about profile-protected package">
618     !!! Trying to unmerge package(s) in system profile. 'sys-apps/portage'
619     !!! This could be damaging to your system.
620 swift 1.3 </pre>
621    
622     <p>
623 swift 1.39 You have asked to remove a package that is part of your system's core packages.
624     It is listed in your profile as required and should therefore not be removed
625     from the system.
626 swift 1.3 </p>
627    
628 swift 1.1 </body>
629     </subsection>
630 nightmorph 1.59 <subsection id="digesterror">
631     <title>Digest Verification Failures</title>
632     <body>
633    
634     <p>
635     Sometimes, when you attempt to emerge a package, it will fail with the message:
636     </p>
637    
638     <pre caption="Digest verification failure">
639     &gt;&gt;&gt; checking ebuild checksums
640     !!! Digest verification failed:
641     </pre>
642    
643     <p>
644     This is a sign that something is wrong with the Portage tree -- often, it is
645     because a developer may have made a mistake when committing a package to the
646     tree.
647     </p>
648    
649     <p>
650     When the digest verification fails, do <e>not</e> try to re-digest the package
651     yourself. Running <c>ebuild foo digest</c> will not fix the problem; it will
652     almost certainly make it worse!
653     </p>
654    
655     <p>
656     Instead, wait an hour or two for the tree to settle down. It's likely that the
657     error was noticed right away, but it can take a little time for the fix to
658     trickle down the Portage tree. While you're waiting, check <uri
659     link="http://bugs.gentoo.org">Bugzilla</uri> and see if anyone has reported
660     the problem yet. If not, go ahead and file a bug for the broken package.
661     </p>
662    
663     <p>
664     Once you see that the bug has been fixed, you may want to re-sync to pick up
665     the fixed digest.
666     </p>
667    
668     <impo>
669     This does <e>not</e> mean that you can re-sync your tree multiple times! As
670     stated in the rsync policy (when you run <c>emerge --sync</c>), users who sync
671     too often will be banned! In fact, it's better to just wait until your next
672     scheduled sync, so that you don't overload the rsync servers.
673     </impo>
674    
675     </body>
676     </subsection>
677 swift 1.1 </section>
678     </sections>

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