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updated package.use and newer alsa example, bug 170176

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 nightmorph 1.62 <!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-working-portage.xml,v 1.61 2006/11/12 21:28:30 nightmorph 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 nightmorph 1.62 <version>1.56</version>
17     <date>2007-03-09</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     You can enable or disable the <c>doc</c> USE flag either globally in the
206     <path>/etc/make.conf</path> file or per package in the
207 nightmorph 1.62 <path>/etc/portage/package.use</path> file. The <uri
208 neysx 1.52 link="?part=2&amp;chap=2">USE Flags</uri> chapter covers this aspect in detail.
209     </p>
210    
211     <p>
212     Once the package installed, its documentation is generally found in a
213     subdirectory named after the package under the <path>/usr/share/doc</path>
214     directory. You can also list all installed files with the <c>equery</c> tool
215     which is part of the <c>app-portage/gentoolkit</c> <uri
216     link="/doc/en/gentoolkit.xml">package</uri>.
217     </p>
218    
219     <pre caption="Locating package documentation">
220 nightmorph 1.62 # <i>ls -l /usr/share/doc/alsa-lib-1.0.14_rc1</i>
221 neysx 1.52 total 28
222     -rw-r--r-- 1 root root 669 May 17 21:54 ChangeLog.gz
223     -rw-r--r-- 1 root root 9373 May 17 21:54 COPYING.gz
224     drwxr-xr-x 2 root root 8560 May 17 21:54 html
225     -rw-r--r-- 1 root root 196 May 17 21:54 TODO.gz
226    
227     <comment>(Alternatively, use equery to locate interesting files:)</comment>
228     # <i>equery files alsa-lib | less</i>
229 nightmorph 1.62 media-libs/alsa-lib-1.0.14_rc1
230     * Contents of media-libs/alsa-lib-1.0.14_rc1:
231 neysx 1.52 /usr
232     /usr/bin
233     /usr/bin/alsalisp
234 neysx 1.53 <comment>(Output truncated)</comment>
235 neysx 1.52 </pre>
236    
237     </body>
238     </subsection>
239     <subsection>
240 swift 1.39 <title>Removing Software</title>
241 swift 1.3 <body>
242    
243     <p>
244 swift 1.39 When you want to remove a software package from your system, use <c>emerge
245 cam 1.47 --unmerge</c>. This will tell Portage to remove all files installed by that
246 swift 1.39 package from your system <e>except</e> the configuration files of that
247     application if you have altered those after the installation. Leaving the
248     configuration files allows you to continue working with the package if you ever
249     decide to install it again.
250 swift 1.3 </p>
251    
252     <p>
253 swift 1.39 However, a <brite>big warning</brite> applies: Portage will <e>not</e> check if
254     the package you want to remove is required by another package. It will however
255     warn you when you want to remove an important package that breaks your system
256     if you unmerge it.
257 swift 1.3 </p>
258    
259 swift 1.39 <pre caption="Removing gnumeric from the system">
260 cam 1.47 # <i>emerge --unmerge gnumeric</i>
261 swift 1.3 </pre>
262    
263     <p>
264 swift 1.39 When you remove a package from your system, the dependencies of that package
265     that were installed automatically when you installed the software are left. To
266     have Portage locate all dependencies that can now be removed, use
267 cam 1.47 <c>emerge</c>'s <c>--depclean</c> functionality. We will talk about this later
268     on.
269 swift 1.3 </p>
270    
271 swift 1.39 </body>
272     </subsection>
273     <subsection>
274     <title>Updating your System</title>
275     <body>
276 swift 1.32
277 swift 1.3 <p>
278 swift 1.39 To keep your system in perfect shape (and not to mention install the latest
279     security updates) you need to update your system regularly. Since Portage only
280     checks the ebuilds in your Portage tree you first have to update your Portage
281     tree. When your Portage tree is updated, you can update your system with
282 swift 1.57 <c>emerge --update world</c>. In the next example, we'll also use the
283     <c>--ask</c> switch which will tell Portage to display the list of packages it
284     wants to upgrade and ask you if you want to continue:
285 swift 1.3 </p>
286    
287 swift 1.39 <pre caption="Updating your system">
288 swift 1.57 # <i>emerge --update --ask world</i>
289 swift 1.3 </pre>
290    
291     <p>
292 swift 1.39 Portage will then search for newer version of the applications you have
293     installed. However, it will only verify the versions for the applications you
294 nightmorph 1.61 have <e>explicitly</e> installed (the applications listed in
295     <path>/var/lib/portage/world</path>) - it does not thoroughly check their
296     dependencies. If you want to update <e>every single package</e> on your system,
297     add the <c>--deep</c> argument:
298 swift 1.3 </p>
299    
300 swift 1.39 <pre caption="Updating your entire system">
301     # <i>emerge --update --deep world</i>
302 swift 1.3 </pre>
303    
304     <p>
305 swift 1.54 Since security updates also happen in packages you have not explicitly installed
306     on your system (but that are pulled in as dependencies of other programs), it
307     is recommended to run this command once in a while.
308     </p>
309    
310     <p>
311 swift 1.39 If you have altered any of your <uri link="?part=2&amp;chap=2">USE flags</uri>
312     lately you might want to add <c>--newuse</c> as well. Portage will then verify
313     if the change requires the installation of new packages or recompilation of
314     existing ones:
315 swift 1.3 </p>
316    
317 swift 1.39 <pre caption="Performing a full update">
318     # <i>emerge --update --deep --newuse world</i>
319 swift 1.3 </pre>
320    
321 swift 1.1 </body>
322     </subsection>
323     <subsection>
324 neysx 1.51 <title>Metapackages</title>
325 swift 1.11 <body>
326    
327     <p>
328 swift 1.39 Some packages in the Portage tree don't have any real content but are used to
329     install a collection of packages. For instance, the <c>kde</c> package will
330     install a complete KDE environment on your system by pulling in various
331     KDE-related packages as dependencies.
332 swift 1.11 </p>
333    
334     <p>
335 swift 1.39 If you ever want to remove such a package from your system, running <c>emerge
336 cam 1.47 --unmerge</c> on the package won't have much effect as the dependencies remain
337     on the system.
338 swift 1.11 </p>
339    
340     <p>
341 swift 1.39 Portage has the functionality to remove orphaned dependencies as well, but since
342     the availability of software is dynamically dependent you first need to update
343     your entire system fully, including the new changes you applied when changing
344 cam 1.47 USE flags. After this you can run <c>emerge --depclean</c> to remove the
345     orphaned dependencies. When this is done, you need to rebuild the applications
346     that were dynamically linked to the now-removed software titles but don't
347     require them anymore.
348 swift 1.11 </p>
349    
350     <p>
351 swift 1.39 All this is handled with the following three commands:
352 swift 1.11 </p>
353    
354 swift 1.39 <pre caption="Removing orphaned dependencies">
355     # <i>emerge --update --deep --newuse world</i>
356 cam 1.47 # <i>emerge --depclean</i>
357 swift 1.39 # <i>revdep-rebuild</i>
358 swift 1.11 </pre>
359    
360 swift 1.34 <p>
361 swift 1.39 <c>revdep-rebuild</c> is provided by the <c>gentoolkit</c> package; don't forget
362     to emerge it first:
363 swift 1.34 </p>
364    
365 swift 1.39 <pre caption="Installing the gentoolkit package">
366     # <i>emerge gentoolkit</i>
367 swift 1.34 </pre>
368    
369 swift 1.11 </body>
370     </subsection>
371 swift 1.39 </section>
372     <section>
373     <title>When Portage is Complaining...</title>
374 swift 1.11 <subsection>
375 swift 1.39 <title>About SLOTs, Virtuals, Branches, Architectures and Profiles</title>
376 swift 1.1 <body>
377    
378 swift 1.3 <p>
379 swift 1.39 As we stated before, Portage is extremely powerful and supports many features
380     that other software management tools lack. To understand this, we explain a few
381 neysx 1.46 aspects of Portage without going into too much detail.
382 swift 1.3 </p>
383    
384     <p>
385 swift 1.39 With Portage different versions of a single package can coexist on a system.
386     While other distributions tend to name their package to those versions (like
387     <c>freetype</c> and <c>freetype2</c>) Portage uses a technology called
388     <e>SLOT</e>s. An ebuild declares a certain SLOT for its version. Ebuilds with
389     different SLOTs can coexist on the same system. For instance, the
390     <c>freetype</c> package has ebuilds with <c>SLOT="1"</c> and <c>SLOT="2"</c>.
391 swift 1.3 </p>
392    
393     <p>
394 swift 1.39 There are also packages that provide the same functionality but are implemented
395     differently. For instance, <c>metalogd</c>, <c>sysklogd</c> and <c>syslog-ng</c>
396     are all system loggers. Applications that rely on the availability of "a system
397     logger" cannot depend on, for instance, <c>metalogd</c>, as the other system
398     loggers are as good a choice as any. Portage allows for <e>virtuals</e>: each
399     system logger provides <c>virtual/syslog</c> so that applications can depend on
400     <c>virtual/syslog</c>.
401 swift 1.3 </p>
402    
403     <p>
404 swift 1.39 Software in the Portage tree can reside in different branches. By default your
405     system only accepts packages that Gentoo deems stable. Most new software titles,
406     when committed, are added to the testing branch, meaning more testing needs to
407     be done before it is marked as stable. Although you will see the ebuilds for
408     those software in the Portage tree, Portage will not update them before they are
409     placed in the stable branch.
410 swift 1.3 </p>
411    
412     <p>
413 swift 1.39 Some software is only available for a few architectures. Or the software doesn't
414     work on the other architectures, or it needs more testing, or the developer that
415     committed the software to the Portage tree is unable to verify if the package
416     works on different architectures.
417 swift 1.25 </p>
418    
419     <p>
420 swift 1.39 Each Gentoo installation adheres to a certain <c>profile</c> which contains,
421     amongst other information, the list of packages that are required for a system
422     to function normally.
423 swift 1.3 </p>
424    
425 swift 1.1 </body>
426     </subsection>
427 swift 1.39 <subsection id="blocked">
428     <title>Blocked Packages</title>
429 swift 1.1 <body>
430    
431 swift 1.39 <pre caption="Portage warning about blocked packages (with --pretend)">
432 fox2mike 1.55 [blocks B ] mail-mta/ssmtp (is blocking mail-mta/postfix-2.2.2-r1)
433 swift 1.39 </pre>
434 swift 1.3
435 swift 1.39 <pre caption="Portage warning about blocked packages (without --pretend)">
436 fox2mike 1.55 !!! Error: the mail-mta/postfix package conflicts with another package.
437 swift 1.39 !!! both can't be installed on the same system together.
438     !!! Please use 'emerge --pretend' to determine blockers.
439 swift 1.3 </pre>
440    
441     <p>
442 swift 1.41 Ebuilds contain specific fields that inform Portage about its dependencies.
443 swift 1.39 There are two possible dependencies: build dependencies, declared in
444     <c>DEPEND</c> and run-time dependencies, declared in <c>RDEPEND</c>. When one of
445     these dependencies explicitly marks a package or virtual as being <e>not</e>
446     compatible, it triggers a blockage.
447 swift 1.3 </p>
448    
449 swift 1.11 <p>
450 swift 1.39 To fix a blockage, you can choose to not install the package or unmerge the
451     conflicting package first. In the given example, you can opt not to install
452 fox2mike 1.55 <c>postfix</c> or to remove <c>ssmtp</c> first.
453 swift 1.11 </p>
454    
455 swift 1.56 <p>
456     It is also possible that two packages that are yet to be installed are blocking
457     each other. In this rare case, you should find out why you need to install both.
458     In most cases you can do with one of the packages alone. If not, please file a
459     bug on <uri link="http://bugs.gentoo.org">Gentoo's bugtracking system</uri>.
460     </p>
461    
462 swift 1.1 </body>
463     </subsection>
464 swift 1.39 <subsection id="masked">
465     <title>Masked Packages</title>
466 swift 1.1 <body>
467    
468 swift 1.39 <pre caption="Portage warning about masked packages">
469     !!! all ebuilds that could satisfy "bootsplash" have been masked.
470     </pre>
471    
472     <pre caption="Portage warning about masked packages - reason">
473     !!! possible candidates are:
474 swift 1.3
475 swift 1.39 - gnome-base/gnome-2.8.0_pre1 (masked by: <i>~x86 keyword</i>)
476     - lm-sensors/lm-sensors-2.8.7 (masked by: <i>-sparc keyword</i>)
477     - sys-libs/glibc-2.3.4.20040808 (masked by: <i>-* keyword</i>)
478     - dev-util/cvsd-1.0.2 (masked by: <i>missing keyword</i>)
479     - media-video/ati-gatos-4.3.0 (masked by: <i>package.mask</i>)
480     - sys-libs/glibc-2.3.2-r11 (masked by: <i>profile</i>)
481 swift 1.35 </pre>
482    
483 swift 1.3 <p>
484 swift 1.39 When you want to install a package that isn't available for your system, you
485     will receive this masking error. You should try installing a different
486     application that is available for your system or wait until the package is put
487     available. There is always a reason why a package is masked:
488 swift 1.3 </p>
489    
490 swift 1.35 <ul>
491     <li>
492 swift 1.39 <b>~arch keyword</b> means that the application is not tested sufficiently
493     to be put in the stable branch. Wait a few days or weeks and try again.
494 swift 1.35 </li>
495     <li>
496 swift 1.39 <b>-arch keyword</b> or <b>-* keyword</b> means that the application does
497     not work on your architecture. If you believe the package does work file
498     a bug at our <uri link="http://bugs.gentoo.org">bugzilla</uri> website.
499 swift 1.35 </li>
500     <li>
501 swift 1.39 <b>missing keyword</b> means that the application has not been tested on
502     your architecture yet. Ask the architecture porting team to test the package
503     or test it for them and report your findings on our <uri
504     link="http://bugs.gentoo.org">bugzilla</uri> website.
505 swift 1.35 </li>
506     <li>
507 swift 1.39 <b>package.mask</b> means that the package has been found corrupt, unstable
508     or worse and has been deliberately marked as do-not-use.
509 swift 1.35 </li>
510     <li>
511 swift 1.39 <b>profile</b> means that the package has been found not suitable for your
512     profile. The application might break your system if you installed it or is
513     just not compatible with the profile you use.
514 swift 1.35 </li>
515     </ul>
516    
517 swift 1.1 </body>
518     </subsection>
519 swift 1.39 <subsection id="missingdependencies">
520     <title>Missing Dependencies</title>
521 swift 1.1 <body>
522    
523 swift 1.39 <pre caption="Portage warning about missing dependency">
524 neysx 1.48 emerge: there are no ebuilds to satisfy "&gt;=sys-devel/gcc-3.4.2-r4".
525 swift 1.3
526 swift 1.39 !!! Problem with ebuild sys-devel/gcc-3.4.2-r2
527     !!! Possibly a DEPEND/*DEPEND problem.
528 swift 1.3 </pre>
529    
530     <p>
531 swift 1.39 The application you are trying to install depends on another package that is not
532     available for your system. Please check <uri
533     link="http://bugs.gentoo.org">bugzilla</uri> if the issue is known and if not,
534     please report it. Unless you are mixing branches this should not occur and is
535     therefore a bug.
536 swift 1.3 </p>
537    
538 swift 1.39 </body>
539     </subsection>
540     <subsection id="ambiguousebuild">
541     <title>Ambiguous Ebuild Name</title>
542     <body>
543 swift 1.3
544 swift 1.39 <pre caption="Portage warning about ambiguous ebuild names">
545     !!! The short ebuild name "aterm" is ambiguous. Please specify
546     !!! one of the following fully-qualified ebuild names instead:
547 swift 1.35
548 swift 1.39 dev-libs/aterm
549     x11-terms/aterm
550 swift 1.3 </pre>
551    
552     <p>
553 swift 1.39 The application you want to install has a name that corresponds with more than
554     one package. You need to supply the category name as well. Portage will inform
555     you of possible matches to choose from.
556 swift 1.35 </p>
557    
558 swift 1.39 </body>
559     </subsection>
560     <subsection id="circulardependencies">
561     <title>Circular Dependencies</title>
562     <body>
563 swift 1.35
564 swift 1.39 <pre caption="Portage warning about circular dependencies">
565     !!! Error: circular dependencies:
566 swift 1.35
567 swift 1.39 ebuild / net-print/cups-1.1.15-r2 depends on ebuild / app-text/ghostscript-7.05.3-r1
568     ebuild / app-text/ghostscript-7.05.3-r1 depends on ebuild / net-print/cups-1.1.15-r2
569 swift 1.35 </pre>
570    
571     <p>
572 swift 1.39 Two (or more) packages you want to install depend on each other and can
573     therefore not be installed. This is most likely a bug in the Portage tree.
574     Please resync after a while and try again. You can also check <uri
575     link="http://bugs.gentoo.org">bugzilla</uri> if the issue is known and if not,
576     report it.
577 swift 1.3 </p>
578    
579 swift 1.39 </body>
580     </subsection>
581     <subsection id="fetchfailed">
582     <title>Fetch failed</title>
583     <body>
584 swift 1.29
585 swift 1.39 <pre caption="Portage warning about fetch failed">
586     !!! Fetch failed for sys-libs/ncurses-5.4-r5, continuing...
587     <comment>(...)</comment>
588     !!! Some fetch errors were encountered. Please see above for details.
589 swift 1.3 </pre>
590    
591 swift 1.35 <p>
592 swift 1.39 Portage was unable to download the sources for the given application and will
593     try to continue installing the other applications (if applicable). This failure
594     can be due to a mirror that has not synchronised correctly or because the ebuild
595     points to an incorrect location. The server where the sources reside can also be
596     down for some reason.
597 swift 1.35 </p>
598    
599     <p>
600 swift 1.39 Retry after one hour to see if the issue still persists.
601 swift 1.35 </p>
602    
603 swift 1.1 </body>
604     </subsection>
605 swift 1.39 <subsection id="profileprotect">
606     <title>System Profile Protection</title>
607 swift 1.1 <body>
608 swift 1.3
609 swift 1.39 <pre caption="Portage warning about profile-protected package">
610     !!! Trying to unmerge package(s) in system profile. 'sys-apps/portage'
611     !!! This could be damaging to your system.
612 swift 1.3 </pre>
613    
614     <p>
615 swift 1.39 You have asked to remove a package that is part of your system's core packages.
616     It is listed in your profile as required and should therefore not be removed
617     from the system.
618 swift 1.3 </p>
619    
620 swift 1.1 </body>
621     </subsection>
622 nightmorph 1.59 <subsection id="digesterror">
623     <title>Digest Verification Failures</title>
624     <body>
625    
626     <p>
627     Sometimes, when you attempt to emerge a package, it will fail with the message:
628     </p>
629    
630     <pre caption="Digest verification failure">
631     &gt;&gt;&gt; checking ebuild checksums
632     !!! Digest verification failed:
633     </pre>
634    
635     <p>
636     This is a sign that something is wrong with the Portage tree -- often, it is
637     because a developer may have made a mistake when committing a package to the
638     tree.
639     </p>
640    
641     <p>
642     When the digest verification fails, do <e>not</e> try to re-digest the package
643     yourself. Running <c>ebuild foo digest</c> will not fix the problem; it will
644     almost certainly make it worse!
645     </p>
646    
647     <p>
648     Instead, wait an hour or two for the tree to settle down. It's likely that the
649     error was noticed right away, but it can take a little time for the fix to
650     trickle down the Portage tree. While you're waiting, check <uri
651     link="http://bugs.gentoo.org">Bugzilla</uri> and see if anyone has reported
652     the problem yet. If not, go ahead and file a bug for the broken package.
653     </p>
654    
655     <p>
656     Once you see that the bug has been fixed, you may want to re-sync to pick up
657     the fixed digest.
658     </p>
659    
660     <impo>
661     This does <e>not</e> mean that you can re-sync your tree multiple times! As
662     stated in the rsync policy (when you run <c>emerge --sync</c>), users who sync
663     too often will be banned! In fact, it's better to just wait until your next
664     scheduled sync, so that you don't overload the rsync servers.
665     </impo>
666    
667     </body>
668     </subsection>
669 swift 1.1 </section>
670     </sections>

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