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aspmx1.migadu.com; dkim=fail ("body hash did not verify") header.d=gmail.com header.s=20210112 header.b=ccMotLEO; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: 6.78 Authentication-Results: aspmx1.migadu.com; dkim=fail ("body hash did not verify") header.d=gmail.com header.s=20210112 header.b=ccMotLEO; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: F30A51A7C X-Spam-Score: 6.78 X-Migadu-Scanner: scn0.migadu.com X-TUID: 2rMr+FNNcwlH * guix/scripts/pack.scm (%options): Extract symlink parsing logic to... (symlink-spec-option-parser): ... here. (self-contained-tarball/builder): Extract symlink->directives logic to... * gnu/build/install.scm (make-symlink->directives): ... here. Add a comment mentioning why a relative file name is used for the link target. * guix/scripts/environment.scm (show-environment-options-help): Document new --symlink option. (%default-options): Add default value for symlinks. (%options): Register new symlink option. (launch-environment/container): Add #:symlinks argument and extend doc. Create symlinks using evaluate-populate-directive and make-symlink->directives. (guix-environment*): Pass symlinks arguments to launch-environment/container. * doc/guix.texi (Invoking guix shell): Document it. * tests/guix-shell.sh: Add a --symlink (negative) test. * tests/guix-environment-container.sh: Add tests. --- doc/guix.texi | 9 ++++- gnu/build/install.scm | 18 +++++++++ guix/scripts/environment.scm | 38 ++++++++++++++----- guix/scripts/pack.scm | 57 ++++++++++++----------------- tests/guix-environment-container.sh | 12 ++++++ tests/guix-shell.sh | 3 ++ 6 files changed, 92 insertions(+), 45 deletions(-) diff --git a/doc/guix.texi b/doc/guix.texi index 3f76184495..94c3f29790 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -49,7 +49,7 @@ Copyright @copyright{} 2017 humanitiesNerd@* Copyright @copyright{} 2017, 2021 Christine Lemmer-Webber@* Copyright @copyright{} 2017, 2018, 2019, 2020, 2021, 2022 Marius Bakke@* Copyright @copyright{} 2017, 2019, 2020, 2022 Hartmut Goebel@* -Copyright @copyright{} 2017, 2019, 2020, 2021 Maxim Cournoyer@* +Copyright @copyright{} 2017, 2019, 2020, 2021, 2022 Maxim Cournoyer@* Copyright @copyright{} 2017–2022 Tobias Geerinckx-Rice@* Copyright @copyright{} 2017 George Clemmer@* Copyright @copyright{} 2017 Andy Wingo@* @@ -6242,6 +6242,12 @@ directory: guix shell --container --expose=$HOME=/exchange guile -- guile @end example +@cindex symbolic links, guix shell +@item --symlink=@var{spec} +@itemx -S @var{spec} +For containers, create the symbolic links specified by @var{spec}, as +documented in @ref{pack-symlink-option}. + @cindex file system hierarchy standard (FHS) @cindex FHS (file system hierarchy standard) @item --emulate-fhs @@ -7034,6 +7040,7 @@ Compress the resulting tarball using @var{tool}---one of @code{gzip}, @code{zstd}, @code{bzip2}, @code{xz}, @code{lzip}, or @code{none} for no compression. +@anchor{pack-symlink-option} @item --symlink=@var{spec} @itemx -S @var{spec} Add the symlinks specified by @var{spec} to the pack. This option can diff --git a/gnu/build/install.scm b/gnu/build/install.scm index 33a9616c0d..031a97e91b 100644 --- a/gnu/build/install.scm +++ b/gnu/build/install.scm @@ -19,6 +19,7 @@ ;;; along with GNU Guix. If not, see . (define-module (gnu build install) + #:use-module ((guix build union) #:select (relative-file-name)) #:use-module (guix build syscalls) #:use-module (guix build utils) #:use-module (guix build store-copy) @@ -26,6 +27,7 @@ (define-module (gnu build install) #:use-module (ice-9 match) #:export (install-boot-config evaluate-populate-directive + make-symlink->directives populate-root-file-system install-database-and-gc-roots populate-single-profile-directory @@ -124,6 +126,22 @@ (define target* (if (string-suffix? "/" target) directive) (apply throw args))))) +(define (make-symlink->directives directory) + "Return a procedure that turn symlinks specs into directives that target +DIRECTORY." + (match-lambda + ((source '-> target) + (let ((target (string-append directory "/" target)) + (parent (dirname source))) + ;; Never add a 'directory' directive for "/" so as to preserve its + ;; ownership and avoid adding the same entries multiple times. + `(,@(if (string=? parent "/") + '() + `((directory ,parent))) + ;; Note: a relative file name is used for compatibility with + ;; relocatable packs. + (,source -> ,(relative-file-name parent target))))))) + (define (directives store) "Return a list of directives to populate the root file system that will host STORE." diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm index de9bc8f98d..7174dd72d2 100644 --- a/guix/scripts/environment.scm +++ b/guix/scripts/environment.scm @@ -33,8 +33,10 @@ (define-module (guix scripts environment) #:use-module ((guix gexp) #:select (lower-object)) #:use-module (guix scripts) #:use-module (guix scripts build) + #:autoload (guix scripts pack) (symlink-spec-option-parser) #:use-module (guix transformations) #:autoload (ice-9 ftw) (scandir) + #:use-module (gnu build install) #:autoload (gnu build linux-container) (call-with-container %namespaces user-namespace-supported? unprivileged-user-namespace-supported? @@ -120,6 +122,9 @@ (define (show-environment-options-help) --expose=SPEC for containers, expose read-only host file system according to SPEC")) (display (G_ " + -S, --symlink=SPEC for containers, add symlinks to the profile according + to SPEC, e.g. \"/usr/bin/env=bin/env\".")) + (display (G_ " -v, --verbosity=LEVEL use the given verbosity LEVEL")) (display (G_ " --bootstrap use bootstrap binaries to build the environment"))) @@ -157,6 +162,7 @@ (define (show-help) (define %default-options `((system . ,(%current-system)) (substitutes? . #t) + (symlinks . ()) (offload? . #t) (graft? . #t) (print-build-trace? . #t) @@ -256,6 +262,7 @@ (define %options (alist-cons 'file-system-mapping (specification->file-system-mapping arg #f) result))) + (option '(#\S "symlink") #t #f symlink-spec-option-parser) (option '(#\r "root") #t #f (lambda (opt name arg result) (alist-cons 'gc-root arg result))) @@ -672,7 +679,7 @@ (define* (launch-environment/fork command profile manifest (define* (launch-environment/container #:key command bash user user-mappings profile manifest link-profile? network? map-cwd? emulate-fhs? (setup-hook #f) - (white-list '())) + (symlinks '()) (white-list '())) "Run COMMAND within a container that features the software in PROFILE. Environment variables are set according to the search paths of MANIFEST. The global shell is BASH, a file name for a GNU Bash binary in the store. When @@ -690,6 +697,9 @@ (define* (launch-environment/container #:key command bash user user-mappings LINK-PROFILE? creates a symbolic link from ~/.guix-profile to the environment profile. +SYMLINKS must be a list of (SOURCE -> TARGET) tuples denoting symlinks to be +added to the container. + Preserve environment variables whose name matches the one of the regexps in WHILE-LIST." (define (optional-mapping->fs mapping) @@ -797,6 +807,10 @@ (define fhs-mappings (mkdir-p home-dir) (setenv "HOME" home-dir) + ;; Create symlinks. + (for-each (cut evaluate-populate-directive <> ".") + (append-map (make-symlink->directives profile) symlinks)) + ;; Call an additional setup procedure, if provided. (when setup-hook (setup-hook profile)) @@ -970,6 +984,7 @@ (define (guix-environment* opts) (let* ((pure? (assoc-ref opts 'pure)) (container? (assoc-ref opts 'container?)) (link-prof? (assoc-ref opts 'link-profile?)) + (symlinks (assoc-ref opts 'symlinks)) (network? (assoc-ref opts 'network?)) (no-cwd? (assoc-ref opts 'no-cwd?)) (emulate-fhs? (assoc-ref opts 'emulate-fhs?)) @@ -1010,15 +1025,17 @@ (define-syntax-rule (with-store/maybe store exp ...) (when container? (assert-container-features)) - (when (and (not container?) link-prof?) - (leave (G_ "'--link-profile' cannot be used without '--container'~%"))) - (when (and (not container?) user) - (leave (G_ "'--user' cannot be used without '--container'~%"))) - (when (and (not container?) no-cwd?) - (leave (G_ "--no-cwd cannot be used without '--container'~%"))) - (when (and (not container?) emulate-fhs?) - (leave (G_ "'--emulate-fhs' cannot be used without '--container~%'"))) - + (when (not container?) + (when link-prof? + (leave (G_ "'--link-profile' cannot be used without '--container'~%"))) + (when user + (leave (G_ "'--user' cannot be used without '--container'~%"))) + (when no-cwd? + (leave (G_ "--no-cwd cannot be used without '--container'~%"))) + (when emulate-fhs? + (leave (G_ "'--emulate-fhs' cannot be used without '--container~%'"))) + (when (pair? symlinks) + (leave (G_ "'--symlink' cannot be used without '--container~%'")))) (with-store/maybe store (with-status-verbosity (assoc-ref opts 'verbosity) @@ -1099,6 +1116,7 @@ (define manifest #:network? network? #:map-cwd? (not no-cwd?) #:emulate-fhs? emulate-fhs? + #:symlinks symlinks #:setup-hook (and emulate-fhs? setup-fhs)))) diff --git a/guix/scripts/pack.scm b/guix/scripts/pack.scm index 06849e4761..e3bddc4274 100644 --- a/guix/scripts/pack.scm +++ b/guix/scripts/pack.scm @@ -61,7 +61,9 @@ (define-module (guix scripts pack) #:use-module (srfi srfi-26) #:use-module (srfi srfi-37) #:use-module (ice-9 match) - #:export (self-contained-tarball + #:export (symlink-spec-option-parser + + self-contained-tarball debian-archive docker-image squashfs-image @@ -160,6 +162,21 @@ (define str (string-join names "-")) ((_) str) ((names ... _) (loop names)))))) +(define (symlink-spec-option-parser opt name arg result) + "A SRFI-37 option parser for the --symlink option." + ;; Note: Using 'string-split' allows us to handle empty + ;; TARGET (as in "/opt/guile=", meaning that /opt/guile is + ;; a symlink to the profile) correctly. + (match (string-split arg (char-set #\=)) + ((source target) + (let ((symlinks (assoc-ref result 'symlinks))) + (alist-cons 'symlinks + `((,source -> ,target) ,@symlinks) + (alist-delete 'symlinks result eq?)))) + (x + (leave (G_ "~a: invalid symlink specification~%") + arg)))) + ;;; ;;; Tarball format. @@ -204,30 +221,15 @@ (define (import-module? module) (use-modules (guix build pack) (guix build store-copy) (guix build utils) - ((guix build union) #:select (relative-file-name)) (gnu build install) (srfi srfi-1) - (srfi srfi-26) - (ice-9 match)) + (srfi srfi-26)) (define %root "root") - (define symlink->directives - ;; Return "populate directives" to make the given symlink and its - ;; parent directories. - (match-lambda - ((source '-> target) - (let ((target (string-append #$profile "/" target)) - (parent (dirname source))) - ;; Never add a 'directory' directive for "/" so as to - ;; preserve its ownership when extracting the archive (see - ;; below), and also because this would lead to adding the - ;; same entries twice in the tarball. - `(,@(if (string=? parent "/") - '() - `((directory ,parent))) - (,source - -> ,(relative-file-name parent target))))))) + ;; Return "populate directives" to make the given symlink and its + ;; parent directories. + (define symlink->directives (make-symlink->directives #$profile)) (define directives ;; Fully-qualified symlinks. @@ -1208,20 +1210,7 @@ (define %options (lambda (opt name arg result) (alist-cons 'compressor (lookup-compressor arg) result))) - (option '(#\S "symlink") #t #f - (lambda (opt name arg result) - ;; Note: Using 'string-split' allows us to handle empty - ;; TARGET (as in "/opt/guile=", meaning that /opt/guile is - ;; a symlink to the profile) correctly. - (match (string-split arg (char-set #\=)) - ((source target) - (let ((symlinks (assoc-ref result 'symlinks))) - (alist-cons 'symlinks - `((,source -> ,target) ,@symlinks) - (alist-delete 'symlinks result eq?)))) - (x - (leave (G_ "~a: invalid symlink specification~%") - arg))))) + (option '(#\S "symlink") #t #f symlink-spec-option-parser) (option '("save-provenance") #f #f (lambda (opt name arg result) (alist-cons 'save-provenance? #t result))) diff --git a/tests/guix-environment-container.sh b/tests/guix-environment-container.sh index fb2c19b193..b509e52e26 100644 --- a/tests/guix-environment-container.sh +++ b/tests/guix-environment-container.sh @@ -241,3 +241,15 @@ guix shell -CF --bootstrap guile-bootstrap glibc \ "glibc-for-fhs") 0 1))' + +# '--symlink' works. +echo "TESTING SYMLINK IN CONTAINER" +guix shell --bootstrap guile-bootstrap --container \ + --symlink=/usr/bin/guile=bin/guile -- \ + /usr/bin/guile --version + +# An invalid symlink spec causes the command to fail. +! guix shell --bootstrap -CS bin/guile=/usr/bin/guile guile-bootstrap -- exit + +# A dangling symlink causes the command to fail. +! guix shell --bootstrap -CS /usr/bin/python=bin/python guile-bootstrap -- exit diff --git a/tests/guix-shell.sh b/tests/guix-shell.sh index 9a6b055264..cb2b53466d 100644 --- a/tests/guix-shell.sh +++ b/tests/guix-shell.sh @@ -32,6 +32,9 @@ export XDG_CONFIG_HOME guix shell --bootstrap --pure guile-bootstrap -- guile --version +# '--symlink' can only be used with --container. +! guix shell --bootstrap guile-bootstrap -S /dummy=bin/guile + # '--ad-hoc' is a thing of the past. ! guix shell --ad-hoc guile-bootstrap -- 2.37.3