tests: Skip 'guix pack' test when networking is unavailable.

* tests/pack.scm ("self-contained-tarball"): Skip unless (network-reachable?).

tests: Fix 'cond-expand' clause for 2.2/2.0.

Fixes a mistake in a9a0227c0127e1813190a7664f7ad858e791480d.

* tests/store.scm ("current-build-output-port, UTF-8 + garbage"):
Inverse the 'cond-expand' clauses since the 'guile-2.0' feature doesn't
exist.

publish: Make the nar URL prefix a parameter.

* guix/scripts/publish.scm (narinfo-string): Add #:nar-path and honor it.
(render-narinfo): Likewise.
(make-request-handler): Likewise.
(run-publish-server): Likewise.
* tests/publish.scm ("custom nar path"): New test.

publish: The public and private keys are now SRFI-39 parameters.

* guix/scripts/publish.scm (%default-options): Add 'public-key-file' and
'private-key-file'.
(lazy-read-file-sexp): Remove.
(%private-key, %public-key): Turn into SRFI-39 parameters.
(signed-string, render-narinfo): Adjust accordingly.
(guix-publish): Honor 'public-key-file' and 'private-key-file' from
OPTS.  Use 'parameterize'.
* guix/pk-crypto.scm (read-file-sexp): New procedure.
* tests/publish.scm: Initialize '%public-key' and '%private-key'.

file-systems: Do not use (gnu packages …).

Fixes a regression introduced in
7208995426714c9fc3ad59cadc3cc0f52df0f018 whereby (gnu system
file-systems) would pull in (gnu packages …) module, which in turn
breaks when importing things like (gnu build shepherd).

* gnu/system/file-systems.scm (file-system-type-predicate): Export.
(file-system-packages): Move to...
* gnu/system/linux-initrd.scm (file-system-packages): ... here.  Add
docstring.
* gnu/services/base.scm: Use it.
* tests/file-systems.scm ("does not pull (gnu packages …)"): New test.

gnu: Rename "guile-next" to "guile".

* gnu/packages/guile.scm (guile-next): Rename to...
(guile-2.2): ... this.  Update users.
[name]: Change to "guile".
[synopsis]: Remove.
[properties]: Remove 'upstream-name', 'ftp-server', and
'ftp-directory'.
* gnu/packages/bioinformatics.scm (rcas-web): Update accordingly.
* gnu/packages/tls.scm (gnutls/guile-2.2): Likewise.
* tests/guix-build.sh: Use 'guile@2.2' instead of 'guile-next'.
* doc/guix.texi (Package Transformation Options): Update examples that
referred to "guile-next".

build: Require Guile >= 2.0.9.

* configure.ac: Bump requirement to 2.0.9.
* doc/guix.texi (Requirements): Adjust accordingly.
* README (Requirements): Likewise.
* build-aux/download.scm: Remove workaround for <http://bugs.gnu.org/13095>.
* guix/build/download.scm: Likewise.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/http-client.scm:  Remove workaround for <http://bugs.gnu.org/13095>.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/serialization.scm (read-latin1-string): Remove mention of 2.0.9.
* tests/nar.scm: Use (ice-9 control).
(let/ec): Remove.

profiles: Packages in a profile can be cross-compiled.

* guix/profiles.scm (profile-derivation): Add #:target parameter; pass
it to 'gexp->derivation'.
* tests/profiles.scm ("profile-derivation, cross-compilation"): New test.

pack: Move absolute file name to <compressor>.

* guix/scripts/pack.scm (<compressor>)[package]: Remove.
[command]: Document as being a gexp with an absolute file name.
(%compressors): Adjust accordingly.
(self-contained-tarball): Simplify PATH expression.  Move 'string-join'
for the compressor command on the build side.
(docker-image): Simplify PATH expression.
* tests/pack.scm (%gzip-compressor): Adjust accordingly.

gexp: Add '=>' syntax to import computed modules.

* guix/gexp.scm (imported-files)[file-pair]: Add case for pairs where
the cdr is not a string.
(imported-modules): Support '=>' syntax in MODULES.
* tests/gexp.scm ("imported-files with file-like objects")
("gexp->derivation & with-imported-module & computed module"): New tests.
* doc/guix.texi (G-Expressions): Document '=>' syntax for
'with-imported-modules'.

utils: Move base16 procedures to (guix base16).

* guix/utils.scm (bytevector->base16-string, base16-string->bytevector):
Move to...
* guix/base16.scm: ... here.  New file.
* tests/utils.scm ("bytevector->base16-string->bytevector"): Move to...
* tests/base16.scm: ... here.  New file.
* Makefile.am (MODULES): Add guix/base16.scm.
(SCM_TESTS): Add tests/base16.scm.
* build-aux/download.scm, guix/derivations.scm,
guix/docker.scm, guix/import/snix.scm, guix/pk-crypto.scm,
guix/scripts/authenticate.scm, guix/scripts/download.scm,
guix/scripts/hash.scm, guix/store.scm, tests/hash.scm,
tests/pk-crypto.scm: Adjust imports accordingly.

tests: Expect less accurate location info in 2.2.0.

* tests/guix-system.sh: Work around inaccurate location info in 2.2.0.

store: Adjust UTF-8 test to Guile 2.2.

* tests/store.scm ("current-build-output-port, UTF-8 + garbage"): On
Guile 2.2, expect REPLACEMENT CHARACTER instead of '?'.

zlib: Don't rely on EBADF being ignored by 'fport_close'.

In 2.2, 'fport_close' no longer swallows EBADF and instead raises a
'system-error' for this.  This commit adjusts for 2.2.

* guix/zlib.scm (close-procedure): Remove.
(make-gzip-input-port): Use 'port->fdes' instead of 'fileno'.
Use 'gzclose' instead of 'close-procedure'.
(make-gzip-output-port): Likewise.
* tests/zlib.scm ("compression/decompression pipe"): Don't check whether
PARENT is closed using 'port-closed?'.  Instead, use 'seek' on the
underlying FD and check for EBADF.

pack: Add unit test.

* guix/scripts/pack.scm (self-contained-tarball): Add #:tar option.
[build](tar-supports-sort?): New variable.  Use it.
* tests/pack.scm: New file.
* Makefile.am (SCM_TESTS): Add it.

ui: Don't use '%default-port-encoding' to set the encoding of string ports.

* guix/ui.scm (right-arrow): Call 'set-port-encoding!' to set PORT's
encoding; remove use of 'with-fluids'.  This is for compatibility with
Guile 2.2 where the encoding of string ports is not influenced by
%DEFAULT-PORT-ENCODING.
* tests/ui.scm ("show-manifest-transaction"): Likewise.

tests: Avoid zero-expression 'begin' form.

* tests/cran.scm ("description->package"): Add body after the expected
pattern in 'match'.

hash: Close or flush sha256 output ports before calling their 'get' procedure.

Slightly different buffering of custom binary output ports in Guile 2.1.7
would lead tests missing 'close-port' or 'force-output' to fail.

* tests/hash.scm ("open-sha256-port, hello"): Add call to 'force-output'
before call to 'get'.
* tests/nar.scm ("write-file puts file in C locale collation order"):
Call 'close-port' before calling 'get-hash'.

Merge branch 'master' into python-tests

tests: Adjust for 'http-fetch' change in (guix import json).

This is a followup to commit 81e0bc1834490a1a8092c75a0733b15c2b407285.

* tests/cpan.scm ("cpan->guix-package"): Add a 'rest' argument to the
lambda that mocks 'http-fetch'.
* tests/crate.scm ("crate->guix-package"): Likewise.
* tests/gem.scm ("gem->guix-package"): Likewise.
* tests/pypi.scm ("pypi->guix-package"): Likewise.
("pypi->guix-package, wheels"): Likewise.