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* gexp: #:references-graphs refers to non-native derivations.Ludovic Courtès2021-03-03
| | | | | | | | | | | | | Fixes a regression introduced in c6d6aee6659acb293eb33f498fdac3b47a19a48, where #:reference-graphs would end up referring to native inputs. This would notably break the compilation of systems using a childhurd, because they would attempt to build the 'hurd' package natively. * guix/gexp.scm (lower-reference-graphs)[tuple->gexp-input]: Honor TARGET. * tests/gexp.scm ("gexp->derivation #:references-graphs cross-compilation"): New test.
* gexp: Micro-optimize 'gexp->sexp' and 'lower-inputs'.Ludovic Courtès2021-02-23
| | | | | | * guix/gexp.scm (lower-inputs, gexp->sexp): Change keyword parameters to positional parameters. Adjust callers accordingly. * tests/gexp.scm (gexp->sexp*, "gexp->file"): Adjust accordingly.
* gexp: 'gexp-inputs' returns both native and non-native inputs.Ludovic Courtès2021-02-23
| | | | | | | | | | | | | | | | | | | | | | | This avoids double traversal of references and extra bookkeeping, thereby further reducing memory allocations. * guix/gexp.scm (lower-gexp): Include only one call to 'lower-inputs'. (gexp-inputs): Remove #:native? parameter. [set-gexp-input-native?]: New procedure. [add-reference-inputs]: Use it. (gexp-native-inputs): Remove. * tests/gexp.scm (gexp-native-inputs): Remove. (gexp-input->tuple): Include 'gexp-input-native?'. ("let-system") ("let-system, nested") ("ungexp + ungexp-native") ("ungexp + ungexp-native, nested") ("ungexp + ungexp-native, nested, special mixture") ("input list") ("input list + ungexp-native") ("input list splicing") ("input list splicing + ungexp-native-splicing") ("gexp list splicing + ungexp-splicing"): Adjust accordingly.
* gexp: 'gexp-inputs' returns a list of <gexp-input> records.Ludovic Courtès2021-02-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This slightly reduces memory allocation. * guix/gexp.scm (lower-inputs): Expect a list of <gexp-input> rather than a list of tuples. (lower-reference-graphs)[tuple->gexp-input]: New procedure. Use it. (gexp-inputs): Return a list of <gexp-input> rather than a list of tuples. * tests/gexp.scm (gexp-input->tuple): New procedure. ("one input package") ("one input package, dotted list") ("one input origin") ("one local file") ("one local file, symlink") ("one plain file") ("two input packages, one derivation, one file") ("file-append") ("file-append, output") ("file-append, nested") ("let-system") ("let-system, nested") ("ungexp + ungexp-native") ("ungexp + ungexp-native, nested") ("ungexp + ungexp-native, nested, special mixture") ("input list") ("input list + ungexp-native") ("input list splicing") ("input list splicing + ungexp-native-splicing") ("gexp list splicing + ungexp-splicing"): Adjust accordingly.
* store-copy: 'populate-store' can optionally deduplicate files.Ludovic Courtès2020-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Until now deduplication was performed as an additional pass after copying files, which involve re-traversing all the files that had just been copied. * guix/store/deduplication.scm (copy-file/deduplicate): New procedure. * tests/store-deduplication.scm ("copy-file/deduplicate"): New test. * guix/build/store-copy.scm (populate-store): Add #:deduplicate? parameter and honor it. * tests/gexp.scm ("gexp->derivation, store copy"): Pass #:deduplicate? #f to 'populate-store'. * gnu/build/image.scm (initialize-root-partition): Pass #:deduplicate? to 'populate-store'. Pass #:deduplicate? #f to 'register-closure'. * gnu/build/vm.scm (root-partition-initializer): Likewise. * gnu/build/install.scm (populate-single-profile-directory): Pass #:deduplicate? #f to 'populate-store'. * gnu/build/linux-initrd.scm (build-initrd): Likewise. * guix/scripts/pack.scm (self-contained-tarball)[import-module?]: New procedure. [build]: Pass it as an argument to 'source-module-closure'. * guix/scripts/pack.scm (squashfs-image)[build]: Wrap in 'with-extensions'. * gnu/system/linux-initrd.scm (expression->initrd)[import-module?]: New procedure. [builder]: Pass it to 'source-module-closure'. * gnu/system/install.scm (cow-store-service-type)[import-module?]: New procedure. Pass it to 'source-module-closure'.
* store-copy: 'populate-store' resets timestamps.Ludovic Courtès2020-12-15
| | | | | | | | | | | | | | | | Until now, 'populate-store' would reset permissions but not timestamps, so callers would resort to going through an extra directory traversal to reset timestamps. * guix/build/store-copy.scm (reset-permissions): Remove. (copy-recursively): New procedure. (populate-store): Pass #:keep-permissions? to 'copy-recursively'. Remove call to 'reset-permissions'. * tests/gexp.scm ("gexp->derivation, store copy"): In BUILD-DRV, check whether 'populate-store' canonicalizes permissions and timestamps. * gnu/build/image.scm (initialize-root-partition): Pass #:reset-timestamps? #f to 'register-closure'. * gnu/build/vm.scm (root-partition-initializer): Likewise.
* gexp: Warn when importing (guix config) or (ice-9 …).Ludovic Courtès2020-11-05
| | | | | | | | | | | While importing those modules from the host system is valid, it is often a mistake that introduces non-reproducibility. This patch prints a warning when that happens. * guix/gexp.scm (gexp-attribute): Add #:validate parameter and honor it. (gexp-modules)[validate-modules]: New procedure. Pass it to 'gexp-attribute'. * tests/gexp.scm ("gexp-modules, warning"): New test.
* gexp: Store the source code location in <gexp>.Ludovic Courtès2020-11-05
| | | | | | | | * guix/gexp.scm (<gexp>)[location]: New field. (gexp-location): New procedure. (write-gexp): Print the location of GEXP. (gexp->derivation): Adjust call to 'make-gexp'. (gexp): Likewise.
* gexp: Fix expansion for (file-append (local-file ...) ...).Ludovic Courtès2020-05-25
| | | | | | | | | Fixes <https://bugs.gnu.org/41527>. Regression introduced in d03001a31a6d460b712825640dba11e3f1a53a14. * guix/gexp.scm (lower+expand-object): When LOWERED is not a struct and EXPAND is true, call EXPAND. * tests/gexp.scm ("file-append, raw store item"): New test.
* tests: Hide quoted (define-module ...) form from Geiser.Ludovic Courtès2020-05-25
| | | | | * tests/gexp.scm (%extension-package): Split (define-module ...) form to fool Geiser.
* gexp: Add 'let-system'.Ludovic Courtès2020-05-16
| | | | | | | | | | | | | | | * guix/gexp.scm (<system-binding>): New record type. (let-system): New macro. (system-binding-compiler): New procedure. (default-expander): Add 'self-quoting?' case. (self-quoting?): New procedure. (lower-inputs): Add 'filterm'. Pass the result of 'mapm/accumulate-builds' through FILTERM. (gexp->sexp)[self-quoting?]: Remove. * tests/gexp.scm ("let-system", "let-system, target") ("let-system, ungexp-native, target") ("let-system, nested"): New tests. * doc/guix.texi (G-Expressions): Document it.
* gexp: Add 'with-parameters'.Ludovic Courtès2020-03-12
| | | | | | | | | | * guix/gexp.scm (<parameterized>): New record type. (with-parameters): New macro. (compile-parameterized): New gexp compiler. * tests/gexp.scm ("with-parameters for %current-system") ("with-parameters for %current-target-system") ("with-parameters + file-append"): New tests. * doc/guix.texi (G-Expressions): Document it.
* gexp: Default to current target.Mathieu Othacehe2020-03-08
| | | | | | | | | | | * guix/gexp.scm (lower-object): Set target argument to 'current by default and look for the current target system at bind time if needed, (gexp->file): ditto, (gexp->script): ditto, (lower-gexp): make sure lowered extensions are not cross-compiled. * tests/gexp.scm: Add cross-compilation test-cases for gexp->script and gexp->file with a target passed explicitely and with a default target.
* gexp: Add 'raw-derivation-file'.Ludovic Courtès2020-01-04
| | | | | | | * guix/gexp.scm (<raw-derivation-file>): New record type. (raw-derivation-file-compiler): New gexp compiler. * tests/gexp.scm ("lower-gexp, raw-derivation-file") ("raw-derivation-file"): New tests.
* gexp: Allow character literals in GEXP->SEXP.Marius Bakke2019-12-18
| | | | | | | | | Fixes <https://bugs.gnu.org/38628>. * tests/gexp.scm ("lower-gexp, character literal"): New test. * guix/gexp.scm (gexp->sexp)[self-quoting?]: Add CHAR? to the tested types. * guix/repl.scm (self-quoting?): Likewise. * gnu/tests.scm (marionette-shepherd-service)[self-quoting?]: Likewise.
* gexp: 'local-file' properly resolves non-literal relative file names.Ludovic Courtès2019-11-30
| | | | | | | | * guix/gexp.scm (local-file): Distinguish the case where FILE is a literal string and when it's not. Add a clause for when FILE is not a literal string. * tests/gexp.scm ("local-file, non-literal relative file name"): New test. * doc/guix.texi (G-Expressions): Update accordingly.
* gexp: Catch and report non-self-quoting gexp inputs.Ludovic Courtès2019-09-23
| | | | | | | | | | | Previously we would, for example, generate build scripts in the store; when trying to run them, we'd get a 'read' error due to the presence of #<foo> syntax in there. * guix/gexp.scm (gexp->sexp)[self-quoting?]: New procedure. [reference->sexp]: Check whether the argument in a <gexp-input> box is self-quoting. Raise a '&gexp-input-error' condition if it's not. * tests/gexp.scm ("lower-gexp, non-self-quoting input"): New test.
* gexp: 'program-file' honors the current system and cross-compilation target.Ludovic Courtès2019-07-26
| | | | | | | | | | | | Fixes <https://bugs.gnu.org/36813>. Reported by Jakob L. Kreuze <zerodaysfordays.sdf.org@sdf.org>. * guix/gexp.scm (program-file-compiler): Pass #:system and #:target to 'gexp->script'. (load-path-expression): Add #:system and #:target and honor them. (gexp->script): Likewise. * tests/gexp.scm ("program-file #:system"): New test. * doc/guix.texi (G-Expressions): Adjust accordingly.
* gexp: 'lowered-gexp-guile' now returns a <derivation-input>.Ludovic Courtès2019-07-15
| | | | | | | | | * guix/derivations.scm (derivation-input-output-path): New procedure. * guix/gexp.scm (lower-gexp): Wrap GUILE in a <derivation-input>. (gexp->derivation): Adjust accordingly. * guix/remote.scm (remote-pipe-for-gexp, remote-eval): Adjust accordingly. * tests/gexp.scm ("lower-gexp"): Adjust accordingly.
* gexp: <lowered-gexp> separates sources from derivation inputs.Ludovic Courtès2019-07-15
| | | | | | | | | | | | | | | | | * guix/gexp.scm (lower-inputs): Return either <derivation-input> records or store items. (lower-reference-graphs): Return file/input pairs. (<lowered-gexp>)[sources]: New field. (lower-gexp): Adjust accordingly. (gexp->input-tuple): Remove. (gexp->derivation)[graphs-file-names]: Handle only the 'derivation-input?' and 'string?' cases. Pass #:sources to 'raw-derivation'; ensure #:inputs contains only <derivation-input> records. * guix/remote.scm (remote-eval): Adjust to the new <lowered-gexp> interface. * tests/gexp.scm ("lower-gexp"): Adjust to expect <derivation-input> records instead of <gexp-input>
* gexp: Add 'lower-gexp' and express 'gexp->derivation' in terms of it.Ludovic Courtès2019-07-04
| | | | | | | | | | | | | | | * guix/gexp.scm (gexp-input-thing, gexp-input-output) (gexp-input-native?): Export. (lower-inputs): Return <gexp-input> records instead of tuples. (lower-reference-graphs): Adjust accordingly. (<lowered-gexp>): New record type. (lower-gexp, gexp-input->tuple): New procedure. (gexp->derivation)[%modules]: Remove. [requested-graft?]: New variable. [add-modules]: New procedure. Rewrite in terms of 'lower-gexp'. (gexp-inputs): Add TODO comment. * tests/gexp.scm ("lower-gexp"): New test.
* store: Rename '&nix-error' to '&store-error'.Ludovic Courtès2019-01-21
| | | | | | | | | | | | | | | | | | | * guix/store.scm (&nix-error): Rename to... (&store-error): ... this, and adjust users. (&nix-connection-error): Rename to... (&store-connection-error): ... this, and adjust users. (&nix-protocol-error): Rename to... (&store-protocol-error): ... this, adjust users. (&nix-error, &nix-connection-error, &nix-protocol-error): Define these condition types and their getters as deprecrated aliases. * build-aux/run-system-tests.scm, guix/derivations.scm, guix/grafts.scm, guix/scripts/challenge.scm, guix/scripts/graph.scm, guix/scripts/lint.scm, guix/scripts/offload.scm, guix/serialization.scm, guix/ssh.scm, guix/tests.scm, guix/ui.scm, tests/derivations.scm, tests/gexp.scm, tests/guix-daemon.sh, tests/packages.scm, tests/store.scm, doc/guix.texi: Adjust to use the new names.
* gexp: Lowering a <computed-file> honors SYSTEM and TARGET.Ludovic Courtès2019-01-05
| | | | | | * guix/gexp.scm (computed-file-compiler): Pass #:system and #:target to 'gexp->derivation'. * tests/gexp.scm ("lower-object, computed-file, #:system"): New test.
* Merge branch 'master' into core-updatesMarius Bakke2018-11-29
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| * derivations: Add properties.Ludovic Courtès2018-11-28
| | | | | | | | | | | | | | | | | | | | | | | | * guix/derivations.scm (derivation): Add #:properties parameter. [user+system-env-vars]: Honor it. (derivation-properties): New procedure. (build-expression->derivation): Add #:properties and pass it to 'derivation'. * guix/gexp.scm (gexp->derivation): Likewise. * tests/derivations.scm ("derivation-properties"): New test. * tests/gexp.scm ("gexp->derivation properties"): New test. * doc/guix.texi (Derivations, G-Expressions): Adjust accordingly.
* | Merge branch 'master' into core-updatesMarius Bakke2018-11-14
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| * tests: Add 'test-assertm' to (guix tests).Ludovic Courtès2018-11-12
| | | | | | | | | | | | | | | | | | * guix/tests.scm (test-assertm): New macro. * tests/gexp.scm (test-assertm): Remove. * tests/profiles.scm (test-assertm): Remove. * tests/challenge.scm (%store, test-assertm): Remove. * tests/debug-link.scm (%store, test-assertm): Remove. * tests/size.scm (%store, test-assertm): Remove.
* | Merge branch 'master' into core-updatesMarius Bakke2018-11-05
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| * gexp: 'gexp-modules' now consistently deletes duplicates.Ludovic Courtès2018-10-27
| | | | | | | | | | | | | | | | | | | | | | Fixes <https://bugs.gnu.org/32966>. Reported by Clément Lassieur <clement@lassieur.org>. * guix/gexp.scm (gexp-attribute): Add 'equal?' optional parameter; pass it to 'delete-duplicates'. (gexp-modules)[module=?]: New procedure. Pass it to 'gexp-attribute'. * tests/gexp.scm ("gexp-modules deletes duplicates"): New test.
* | Merge branch 'master' into core-updatesMarius Bakke2018-10-05
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| * tests: Update (guix build store-copy) tests.Ludovic Courtès2018-09-27
| | | | | | | | | | | | | | | | This is a followup to a387b0bebb151a766ca6a454a891f2370c96703c. * tests/gexp.scm ("gexp->derivation, store copy") ("gexp->derivation #:references-graphs"): Add (guix progress) and (guix records) to the imported modules.
* | Merge branch 'master' into core-updatesMarius Bakke2018-09-09
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| * gexp: 'file-union' accepts directory names.Ludovic Courtès2018-09-08
| | | | | | | | | | | | * guix/gexp.scm (file-union): Import (guix build utils). Make the parent directories of TARGET. * tests/gexp.scm ("file-union"): New test.
* | gexp: Remove backward compatibility hack for 'imported-files'.Ludovic Courtès2018-07-26
|/ | | | | | | * guix/gexp.scm (gexp->derivation): Remove #:import-creates-derivation?. (imported-files): Remove #:derivation? and adjust callers. (imported-modules), compiled-modules): Likewise. * guix/packages.scm (patch-and-repack): Adjust 'gexp->derivation' call.
* gexp: 'imported-files/derivation' can copy files instead of symlinking.Ludovic Courtès2018-07-19
| | | | | | | | * guix/gexp.scm (imported-files/derivation): Add #:symlink? and honor it. (imported-files): Pass #:symlink? to 'imported-files/derivation'. * tests/gexp.scm ("imported-files with file-like objects"): Add 'file=?' and use it instead of calling 'readlink'.
* gexp: 'imported-files' no longer creates a derivation by default.Ludovic Courtès2018-07-19
| | | | | | | | | | | | | | | | | | * guix/gexp.scm (gexp->derivation): Add #:import-creates-derivation?. Pass #:derivation? to 'imported-modules' and 'compiled-modules'. In -L argument, check whether MODULES is a derivation. (%not-slash): New variable. (file-mapping->tree): New procedure. (imported-files): Rename to... (imported-files/derivation): ... this. (imported-files): New procedure. Rewrite in terms of 'interned-file-tree' when possible; add #:derivation? parameter. (imported-modules, compiled-modules): Add #:derivation? parameter and pass it to 'imported-files'. * guix/packages.scm (patch-and-repack): Pass #:import-creates-derivation? to 'gexp->derivation'. * tests/gexp.scm ("imported-files"): Adjust to no longer expect a derivation.
* tests: Don't rely on temporary directories being permanent.Leo Famulari2018-07-13
| | | | | * tests/gexp.scm ("gexp->script #:module-path", "program-file #:module-path"): Use run-with-store.
* store-copy: 'read-reference-graph' returns a list of records.Ludovic Courtès2018-06-14
| | | | | | | | | | | | | | The previous implementation of 'read-reference-graph' was good enough for many use cases, but it discarded the graph structure, which is useful information in some cases. * guix/build/store-copy.scm (<store-info>): New record type. (read-reference-graph): Rewrite to return a list of <store-info>. (closure-size, populate-store): Adjust accordingly. * gnu/services/base.scm (references-file): Adjust accordingly. * gnu/system/vm.scm (system-docker-image): Likewise. * guix/scripts/pack.scm (squashfs-image, docker-image): Likewise. * tests/gexp.scm ("gexp->derivation #:references-graphs"): Likewise.
* gexp: Add 'with-extensions'.Ludovic Courtès2018-06-01
| | | | | | | | | | | | | | | | | | | | | | | * guix/gexp.scm (<gexp>)[extensions]: New field. (gexp-attribute): New procedure. (gexp-modules): Write in terms of 'gexp-attribute'. (gexp-extensions): New procedure. (gexp->derivation): Add #:effective-version. [extension-flags]: New procedure. Honor extensions of EXP. (current-imported-extensions): New syntax parameter. (with-extensions): New macro. (gexp): Honor CURRENT-IMPORTED-EXTENSIONS. (compiled-modules): Add #:extensions and honor it. (load-path-expression): Likewise. (gexp->script, gexp->file): Honor extensions. * tests/gexp.scm (%extension-package): New variable. ("gexp-extensions & ungexp") ("gexp-extensions & ungexp-splicing") ("gexp-extensions and literal Scheme object") ("gexp->derivation & with-extensions") ("program-file & with-extensions"): New tests. * doc/guix.texi (G-Expressions): Document 'with-extensions'.
* gexp: 'scheme-file' can splice expressions.Ludovic Courtès2018-04-11
| | | | | | | | | | * guix/gexp.scm (<scheme-file>)[splice?]: New field. (scheme-file): Add #:splice? and pass it to '%scheme-file'. (scheme-file-compiler): Pass SPLICE? to 'gexp->file'. (gexp->file): Add #:splice? and honor it. * tests/gexp.scm ("gexp->file + #:splice?"): New test. ("gexp->derivation & with-imported-module & computed module"): Use #:splice? #t.
* gexp: 'program-file' has a new #:module-path parameter.Ludovic Courtès2018-03-23
| | | | | | | | * guix/gexp.scm (<program-file>): Add 'path' field. (program-file): Add #:module-path parameter and honor it. (program-file-compiler): Honor the 'path' field. * tests/gexp.scm ("program-file #:module-path"): New test. * doc/guix.texi (G-Expressions): Update.
* gexp: 'gexp->script' and 'gexp->file' have a new #:module-path parameter.Ludovic Courtès2018-03-23
| | | | | | | | * guix/gexp.scm (load-path-expression): Add 'path' optional parameter. (gexp->script): Add #:module-path and honor it. (gexp->file): Likewise. * tests/gexp.scm ("gexp->script #:module-path"): New test. * doc/guix.texi (G-Expressions): Update accordingly.
* gexp: 'ungexp-splicing' properly accounts for nested native inputs.Ludovic Courtès2017-07-17
| | | | | | | | | | Previously, (gexp-native-inputs #~#$@(list #~#+foo)) would return '(). This is a followup to 5b14a7902c58d9fb7923f9e16871f549fbe59b6e. * guix/gexp.scm (gexp-inputs)[add-reference-inputs]: In the list case, remove 'if' around 'fold-right'. In 'map' lambda, always inherit N?. * tests/gexp.scm ("gexp list splicing + ungexp-splicing"): New test.
* gexp: 'gexp-modules' accepts plain Scheme objects.Ludovic Courtès2017-04-19
| | | | | * guix/gexp.scm (gexp-modules): Return '() when not (gexp? GEXP). * tests/gexp.scm ("gexp-modules and literal Scheme object"): New test.
* gexp: 'lower-object' raises an exception when passed an invalid object.Ludovic Courtès2017-04-04
| | | | | | | * guix/gexp.scm (&gexp-error, &gexp-input-error): New error conditions. (lower-object): Raise &gexp-input-error when 'lookup-compiler' returns #f. * tests/gexp.scm ("lower-object & gexp-input-error?"): New test. * guix/ui.scm (call-with-error-handling): Add case for 'gexp-input-error?'.
* gexp: Add '=>' syntax to import computed modules.Ludovic Courtès2017-03-16
| | | | | | | | | | * guix/gexp.scm (imported-files)[file-pair]: Add case for pairs where the cdr is not a string. (imported-modules): Support '=>' syntax in MODULES. * tests/gexp.scm ("imported-files with file-like objects") ("gexp->derivation & with-imported-module & computed module"): New tests. * doc/guix.texi (G-Expressions): Document '=>' syntax for 'with-imported-modules'.
* gexp: Support 'ungexp' forms in improper lists.Ludovic Courtès2017-01-01
| | | | | | | * guix/gexp.scm (gexp)[collect-escapes, substitute-references]: Replace the (exp0 exp ...) patterns with (exp0 . exp) to match improper lists. Adjust clause bodies accordingly. * tests/gexp.scm ("one input package, dotted list"): New test.
* gexp: Native inputs of nested gexps are properly accounted for.Ludovic Courtès2016-12-19
| | | | | | | | | | | | | | | | | | | Previously, 'gexp-native-inputs' would not return the native inputs of nested gexps. For example, this: (gexp-native-inputs #~(foo #$#~(bar #+coreutils))) would return '(). * guix/gexp.scm (gexp-inputs)[add-reference-inputs]: In the non-recursive cases, check whether N? and NATIVE? are the same, and act accordingly. [native-input?]: Remove. Fold over all of (gexp-references exp). * tests/gexp.scm ("ungexp + ungexp-native, nested, special mixture"): New test. * tests/gexp.scm ("input list splicing + ungexp-native-splicing"): Pass #:native? #t to 'gexp-input'.
* store: Add 'references*'.Ludovic Courtès2016-11-19
| | | | | | | | | | | * guix/store.scm (references*): New procedure. * guix/profiles.scm (manifest-lookup-package)[references*]: Remove. * guix/scripts/system.scm (references*): Remove. * tests/gexp.scm ("gexp->file", "gexp->file + file-append") ("gexp->derivation", "gexp->derivation, cross-compilation") ("gexp->derivation, ungexp + ungexp-native") ("scheme-file", "text-file*", "mixed-text-file"): Remove 'references*' instead of (store-lift references).
* gexp: Add 'file-append'.Ludovic Courtès2016-09-09
| | | | | | | | | | * guix/gexp.scm (<file-append>): New record type. (file-append): New procedure. (file-append-compiler): New gexp compiler. * tests/gexp.scm ("file-append", "file-append, output") ("file-append, nested", "gexp->file + file-append"): New tests. * doc/guix.texi (G-Expressions): Use it in 'nscd' and 'list-files' examples. Document 'file-append'.