* guix/scripts/pull.scm (display-profile-news): Return true when there's
more to display.
(display-news-entry-title): New procedure.
(display-news-entry): Use it.
(display-channel-specific-news): Return true when there's more to
display.
(display-channel-news-headlines): New procedure.
(build-and-install): Call it. When 'display-channel-news-headlines' or
'display-profile-news' returns #t, print a hint to run "pull --news".
(display-new/upgraded-packages): Return true when there's more to display.
* guix/scripts/pull.scm (display-news-entry)
(display-channel-specific-news): New procedures.
(display-channel-news): Call it.
(display-new/upgraded-packages): Adjust hint message.
* doc/guix.texi (Invoking guix pull): Mention it.
Suggested by Ricardo Wurmus <rekado@elephly.net>.
* guix/channels.scm (<channel-news-entry>)[tag]: New field.
(sexp->channel-news-entry): Accept either 'commit' or 'tag' in 'entry'
forms.
(resolve-channel-news-entry-tag): New procedure.
(channel-news-for-commit): Move 'with-repository' form one level
higher. Call 'resolve-channel-news-entry-tag' on all the news entries.
* guix/tests/git.scm (populate-git-repository): Add clause for 'tag'.
* tests/channels.scm ("channel-news, one entry"): Create a tag and add
an entry with a tag. Check that the tag is resolved and also visible in
the <channel-news-entry> record.
* doc/guix.texi (Channels): Mention tags in news entries.
* guix/channels.scm (<channel-metadata>)[news-file]: New field.
(read-channel-metadata): Set the 'news-file' field.
(read-channel-metadata-from-source): Likewise.
(<channel-news>, <channel-news-entry>): New record types.
(sexp->channel-news-entry, read-channel-news)
(channel-news-for-commit): New procedures.
* guix/tests/git.scm (populate-git-repository): For 'add', allow
CONTENTS to be a procedure.
* tests/channels.scm ("channel-news, no news")
("channel-news, one entry"): New tests.
* doc/guix.texi (Channels): Document it.
Until this change, it would fail to build with:
In file included from /tmp/guix-build-perf-5.2.15.drv-0/linux-5.2.15/tools/include/uapi/linux/ethtool.h:19:0,
from xsk.c:18:
/gnu/store/…-linux-libre-headers-4.19.56/include/linux/if_ether.h:165:1: error: packed attribute is unnecessary for 'ethhdr' [-Werror=packed]
* gnu/packages/linux.scm (perf)[arguments]: In 'configure' phase, remove
"-Werror" from 'tools/lib/bpf/Makefile'.
This is a followup to 6bbb37a545.
* gnu/packages/music.scm (instantmusic): Move 'fix-file-permissions'
phase before 'install' rather than before 'check'.
As defaulting by stderr, along with the shepherd service not directing the
output to a log file makes seeing the output difficult, compared to logging to
syslog.
* gnu/services/virtualization.scm (libvirt-configuration)[log-outputs]: Change
default from "3:stderr" to "3:syslog:libvirtd".
Ludovic Courtès