gnu: Add python-pyld.

* gnu/packages/python.scm (python-pyld, python2-pyld): New variables.

gnu: Add python-exif-read.

* gnu/packages/python.scm (python-exif-read, python2-exif-read): New
  variables.

pull: Add a compilation progress report.

* guix/build/pull.scm (report-build-progress): New procedure.
  (p-for-each): Add #:progress parameter.
  [loop]: Keep track of the number of completed processes.  Tail-call
  PROGRESS at each loop iteration.
  (build-guix): Add #:debug-port parameter.  Use it for verbose
  messages.  Change 'tar' flags to 'xf'.  Around 'compile-file' call,
  bind CURRENT-WARNING-PORT to DEBUG-PORT.
* guix/scripts/pull.scm (unpack): Add #:verbose? parameter.
  [builder]: Pass #:debug-port to 'build-guix'.
  (guix-pull): Leave CURRENT-BUILD-OUTPUT-PORT unchanged.  Pass
  #:verbose? to 'unpack'.

vm: Move store copy handling to (guix build store-copy).

* gnu/build/vm.scm (read-reference-graph, populate-store): Move to...
* guix/build/store-copy.scm: ... here.  New file.
* Makefile.am (MODULES): Add it.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Adjust default
  #:modules values accordingly.
* tests/gexp.scm ("gexp->derivation, store copy"): New test.

linux-initrd: Move Linux module tree flattening to another derivation.

* gnu/system/linux-initrd.scm (expression->initrd)[string->regexp]:
  Remove.
  Use 'flat-linux-module-directory'.  Remove the equivalent logic from
  'builder'.
  (flat-linux-module-directory): New procedure.

profiles: Use a real arrow to denote upgrades in ASCII.

Suggested by Alex Kost.

* guix/profiles.scm (right-arrow): Fall back to "->".
* tests/profiles.scm ("manifest-show-transaction"): Adjust accordingly.

Add Emacs user interface.

* configure.ac (emacsuidir): New variable.
  (AC_CONFIG_FILES): Add 'emacs/guix-init.el', 'emacs/guix-helper.scm'.
* Makefile.am: Include 'emacs.am'.
* emacs.am: New file.
* doc/emacs.texi: New file.
* doc/guix.texi: Include 'emacs.texi'.
* emacs/guix-backend.el: New file.
* emacs/guix-base.el: New file.
* emacs/guix-helper.scm.in: New file.
* emacs/guix-history.el: New file.
* emacs/guix-info.el: New file.
* emacs/guix-init.el.in: New file.
* emacs/guix-list.el: New file.
* emacs/guix-main.scm: New file.
* emacs/guix-utils.el: New file.
* emacs/guix.el: New file.

gnu: datamash: Fix license.

* gnu/packages/datamash.scm (datamash)[license]: Change to GPL3+.

linux-initrd: Factorize cpio archive creation.

* gnu/build/linux-initrd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system/linux-initrd.scm (expression->initrd): Use (gnu build
  linux-initrd) and 'write-cpio-archive' instead of the inlined code.

Move part of (gnu build linux-boot) to (gnu build file-systems).

* gnu/build/linux-boot.scm (%ext2-endianness, %ext2-sblock-magic,
  %ext2-sblock-creator-os, %ext2-sblock-uuid, %ext2-sblock-volume-name,
  read-ext2-superblock, ext2-superblock-uuid,
  ext2-superblock-volume-name, disk-partitions,
  partition-label-predicate, find-partition-by-label,
  canonicalize-device-spec, MS_RDONLY, MS_NOSUID, MS_NODEV, MS_NOEXEC,
  MS_BIND, MS_MOVE, bind-mount, check-file-system,
  mount-flags->bit-mask, mount-file-system): Move to...
* gnu/build/file-systems.scm: ... here.  New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/base.scm: Use (gnu build file-systems).
* gnu/services/dmd.scm (dmd-configuration-file): Likewise.
* gnu/system.scm (operating-system-activation-script): Likewise.
* gnu/system/linux-initrd.scm (base-initrd): Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.

Rename (gnu build linux-initrd) to (gnu build linux-boot).

* gnu/build/linux-initrd.scm: Rename to...
* gnu/build/linux-boot.scm: ... this.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* gnu/build/activation.scm, gnu/build/vm.scm, gnu/services/base.scm,
  gnu/services/dmd.scm, gnu/system.scm, gnu/system/linux-initrd.scm,
  gnu/system/vm.scm: Adjust accordingly.

Move operating system helpers from (guix build …) to (gnu build …).

* guix/build/activation.scm, guix/build/install.scm,
  guix/build/linux-initrd.scm, guix/build/vm.scm: Move to...
* gnu/build: ... here.
* Makefile.am (MODULES): Remove the above guix/build/ files.
* gnu-system.am (GNU_SYSTEM_MODULES): Add the above gnu/build/ files
  here.
* gnu/services/base.scm, gnu/services/dmd.scm, gnu/system.scm,
  gnu/system/linux-initrd.scm, gnu/system/vm.scm,
  guix/scripts/system.scm: Adjust to the new module names.

doc: Mention 'guix lint' and '--list-dependent' in 'HACKING'.

* HACKING (Submitting Patches): Mention 'guix lint' and 'guix refresh
  --list-dependent'.

guix lint: Remove "guix lint: " prefix from warnings.

This allows editors to parse warnings correctly.

* guix/scripts/lint.scm (emit-warning): Use 'format' instead of
  'warning', to avoid the "guix lint: " prefix in messages.
* tests/lint.scm (call-with-warnings): Indent.

gnu: Add postgresql.

* gnu/packages/postgresql.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

scripts: add guix lint

* guix/scripts/lint.scm: New file. Defines a 'lint' tool for Guix packages.
* tests/lint.scm: New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* po/guix/Makevars: Update appropriately.
* po/guix/POTFILES.in: Update appropriately.
* doc/guix.texi: Document "guix lint".

Move specification->package to gnu/packages.scm.

* guix/scripts/build.scm (specification->package): Move from here...
* gnu/packages.scm: ... to here.

daemon: Do not use 'vfork'.

This fixes random EBADF errors in the daemon on ancient Linux kernels
such as version 2.6.32.

* config-daemon.ac: Remove detection of 'vfork'.

gnu: Add nvi.

* gnu/packages/nvi.scm: New file.
* gnu/packages/patches/nvi-assume-preserve-path.patch: New file.
* gnu-system.am: Add them.

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

profiles: Report version numbers in a separate column.

* guix/profiles.scm (manifest-show-transaction)[package-strings,
  upgrade-strings]: Show version number in separate column.  Show OUTPUT
  in first column, and only when it's different from "out".