shell: Add '--export-manifest'.

* guix/scripts/shell.scm (show-help, %options): Add '--export-manifest'.
(manifest-entry-version-prefix, manifest->code*)
(export-manifest): New procedures.
(guix-shell): Honor '--export-manifest'.
* tests/guix-shell-export-manifest.sh: New file.
* Makefile.am (SH_TESTS): Add it.
* doc/guix.texi (Invoking guix shell): Document '--export-manifest'.
(Invoking guix environment): Link to it.
(Invoking guix pack): Likewise.

1 files changed, 84 insertions, 0 deletions

diff --git a/tests/guix-shell-export-manifest.sh b/tests/guix-shell-export-manifest.sh
new file mode 100644
index 00000000000..cbb90f04bfc
--- /dev/null
+++ b/tests/guix-shell-export-manifest.sh
@@ -0,0 +1,84 @@
+# GNU Guix --- Functional package management for GNU
+# Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
+#
+# This file is part of GNU Guix.
+#
+# GNU Guix is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at
+# your option) any later version.
+#
+# GNU Guix is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+#
+# Test 'guix shell --export-manifest'.
+#
+
+guix shell --version
+
+tmpdir="t-guix-manifest-$$"
+trap 'rm -r "$tmpdir"' EXIT
+mkdir "$tmpdir"
+
+manifest="$tmpdir/manifest.scm"
+
+# Basics.
+guix shell --export-manifest guile-bootstrap > "$manifest"
+test "$(guix build -m "$manifest")" = "$(guix build guile-bootstrap)"
+
+guix shell -m "$manifest" --bootstrap -- \
+     "$SHELL" -c 'guix package --export-manifest -p "$GUIX_ENVIRONMENT"' > \
+     "$manifest.second"
+for m in "$manifest" "$manifest.second"
+do
+    grep -v '^;' < "$m" > "$m.new" # filter out comments
+    mv "$m.new" "$m"
+done
+
+cat "$manifest"
+cat "$manifest.second"
+
+cmp "$manifest" "$manifest.second"
+
+# Combining manifests.
+guix shell --export-manifest -m "$manifest" gash gash-utils \
+     > "$manifest.second"
+guix build -m "$manifest.second" -d | \
+    grep "$(guix build guile-bootstrap -d)"
+guix build -m "$manifest.second" -d | \
+    grep "$(guix build gash -d)"
+
+# Package transformation option.
+guix shell --export-manifest guile guix --with-latest=guile-json > "$manifest"
+grep 'options->transformation' "$manifest"
+grep '(with-latest . "guile-json")' "$manifest"
+
+# Development manifest.
+guix shell --export-manifest -D guile git > "$manifest"
+grep 'package->development-manifest' "$manifest"
+grep '"guile"' "$manifest"
+guix build -m "$manifest" -d | \
+    grep "$(guix build -e '(@@ (gnu packages commencement) gcc-final)' -d)"
+guix build -m "$manifest" -d | \
+    grep "$(guix build git -d)"
+
+# Test various combinations to make sure generated code uses interfaces
+# correctly.
+for options in                                  \
+    "coreutils grep sed"                        \
+    "gsl openblas gcc-toolchain --tune"         \
+    "guile -m $manifest.previous"               \
+    "git:send-email gdb guile:debug"            \
+    "git -D coreutils"
+do
+    guix shell --export-manifest $options > "$manifest"
+    cat "$manifest"
+    guix shell -m "$manifest" -n
+    mv "$manifest" "$manifest.previous"
+done