This patch reverts the behavior introduced in
181951207339508789b28ba7cb914f983319920f which caused ‘modify-services’
clauses to only match a single instance of a service.

We will now match all service instances when doing a deletion or update, while
still raising an exception when trying to match against a service that does
not exist in the services list, or which was deleted explicitly by a ‘delete’
clause (or an update clause that returns ‘#f’ for the service).

Fixes: #64106

* gnu/services.scm (%modify-services): New procedure.
(modify-services): Use it.
(apply-clauses): Add DELETED-SERVICES argument, change to modify one service
at a time.
* tests/services.scm
("modify-services: delete then modify")
("modify-services: modify then delete")
("modify-services: delete multiple services of the same type")
("modify-services: modify multiple services of the same type"): New tests.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

* guix/import/utils.scm (beautify-description): Exclude punctuation.
* tests/import-utils.scm: Add new test.

* guix/gnu-maintenance.scm (release-file?): Use positive logic in doc.
Add a special case for Qt source archives.
* tests/gnu-maintenance.scm ("release-file?"): Update test.

Fixes <https://issues.guix.gnu.org/64015>.
Fixes <https://issues.guix.gnu.org/65304>.

Previously, the generic HTML updater would only look for the list of files
found at the parent of its current source URL, ignoring that the URL may embed
the version elsewhere in its path.  This could cause 'guix refresh' to report
no updates available, while in fact there were, such as for 'libuv'.

* guix/gnu-maintenance.scm (strip-trailing-slash): New procedure.
(%version-rx): New variable.
(rewrite-url): New procedure.
(import-html-release): New rewrite-url? argument.  When true, use the above
procedure.
(import-html-updatable-release): Call import-html-release with #:rewrite-url
set to #t.
* tests/gnu-maintenance.scm ("rewrite-url, to-version specified")
("rewrite-url, without to-version"): New tests.

* tests/guix-home.sh: home-mcron has changed description, adapt the search.

* tests/guix-shell.sh (fd_list): Use bash instead of $SHELL.  Some other
shells have trouble not opening too many fds.  Also, bash in an implicit input
of guix, so it should always be available.

Fixes a regression introduced in
560cb51e7b37e2c6f6fe4b72a3781185c57fdf83, which would lead this test on
x86_64-linux to return a DIFF with two packages, nhc98 and dev86 (both
have #:system "i686-linux" and thus depend on a different glibc object;
why other system-specific packages such as 'wine' aren't reported is
unclear).

* tests/graph.scm ("node-transitive-edges + node-back-edges"): Use
'test-equal'.  Define 'system-specific?' and use it.

This test was added in 1261ce15233cbf7e24de9959df86a23b46314a28 but it
proved to be bogus: <https://issues.guix.gnu.org/64760>.

* tests/store-roots.scm ("gc-roots, initial"): Remove.

* tests/packages.scm ("package->bag"): Parameterize the expected result by the
system used to lower the package to a bag.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

This allows users to write Bash commands like:

  guix time-machine -C <(echo %default-channels) -- ...

or:

  guix build -m <(echo '(specifications->manifest (list "guile"))')

Previously, on GNU/Linux, they would fail with:

  error: failed to load '/dev/fd/63': No such file or directory

* guix/ui.scm (try-canonicalize-path): New procedure.
(load*): Use it.
* tests/guix-build.sh: Test 'guix build -m' with a /dev/fd/N file.