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environment: Add '--emulate-fhs'.
* guix/scripts/environment.scm (show-environment-options-help, %options): Add '--emulate-fhs'. (setup-fhs): New procedure. Setup for the Filesystem Hierarchy Standard (FHS) container. Defines and uses FHS-SYMLINKS and LINK-CONTENTS to create FHS expected directories and creates /etc/ld.so.conf. (launch-environment): Add 'emulate-fhs?' key and implement it to set $PATH and generate /etc/ld.so.cache before calling COMMAND. (launch-environment/container): Add 'emulate-fhs?' and 'setup-hook' keys and implement them. Define and use FHS-MAPPINGS, to set up additional bind mounts in the container to follow FHS expectations. (guix-environment*): Add glibc-for-fhs to the container packages when 'emulate-fhs?' key is in OPTS. * doc/guix.texi (Invoking guix shell): Document '--emulate-fhs'. (Invoking guix environment): Document '--emulate-fhs'. * tests/guix-environment-container.sh: Add tests for '--emulate-fhs'. Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
John Kehayias
Ludovic Courtès
parent
3d1d29e440
commit
c7ba5f38b8
3 changed files with 218 additions and 24 deletions
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@ -108,6 +108,7 @@ Copyright @copyright{} 2022 Justin Veilleux@*
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Copyright @copyright{} 2022 Reily Siegel@*
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Copyright @copyright{} 2022 Simon Streit@*
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Copyright @copyright{} 2022 (@*
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Copyright @copyright{} 2022 John Kehayias@*
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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@ -6195,6 +6196,27 @@ directory:
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guix shell --container --expose=$HOME=/exchange guile -- guile
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@end example
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@cindex file system hierarchy standard (FHS)
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@cindex FHS (file system hierarchy standard)
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@item --emulate-fhs
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@itemx -F
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When used with @option{--container}, emulate a
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@uref{https://refspecs.linuxfoundation.org/fhs.shtml, Filesystem
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Hierarchy Standard (FHS)} configuration within the container, providing
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@file{/bin}, @file{/lib}, and other directories and files specified by
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the FHS.
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As Guix deviates from the FHS specification, this
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option sets up the container to more closely mimic that of other
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GNU/Linux distributions. This is useful for reproducing other
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development environments, testing, and using programs which expect the
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FHS specification to be followed. With this option, the container will
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include a version of glibc that will read
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@file{/etc/ld.so.cache} within the container for the shared library
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cache (contrary to glibc in regular Guix usage) and set up the
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expected FHS directories: @file{/bin}, @file{/etc}, @file{/lib}, and
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@file{/usr} from the container's profile.
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@item --rebuild-cache
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@cindex caching, of profiles
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@cindex caching, in @command{guix shell}
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@ -6614,6 +6636,22 @@ directory:
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guix environment --container --expose=$HOME=/exchange --ad-hoc guile -- guile
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@end example
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@item --emulate-fhs
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@item -F
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For containers, emulate a Filesystem Hierarchy Standard (FHS)
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configuration within the container, see
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@uref{https://refspecs.linuxfoundation.org/fhs.shtml, the official
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specification}. As Guix deviates from the FHS specification, this
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option sets up the container to more closely mimic that of other
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GNU/Linux distributions. This is useful for reproducing other
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development environments, testing, and using programs which expect the
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FHS specification to be followed. With this option, the container will
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include a version of @code{glibc} which will read
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@code{/etc/ld.so.cache} within the container for the shared library
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cache (contrary to @code{glibc} in regular Guix usage) and set up the
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expected FHS directories: @code{/bin}, @code{/etc}, @code{/lib}, and
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@code{/usr} from the container's profile.
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@end table
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@command{guix environment}
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@ -2,6 +2,7 @@
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;;; Copyright © 2014, 2015, 2018 David Thompson <davet@gnu.org>
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;;; Copyright © 2015-2022 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2018 Mike Gerwitz <mtg@gnu.org>
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;;; Copyright © 2022 John Kehayias <john.kehayias@protonmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -120,6 +121,9 @@ (define (show-environment-options-help)
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--expose=SPEC for containers, expose read-only host file system
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according to SPEC"))
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(display (G_ "
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-F, --emulate-fhs for containers, emulate the Filesystem Hierarchy
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Standard (FHS)"))
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(display (G_ "
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-v, --verbosity=LEVEL use the given verbosity LEVEL"))
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(display (G_ "
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--bootstrap use bootstrap binaries to build the environment")))
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@ -256,6 +260,9 @@ (define %options
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(alist-cons 'file-system-mapping
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(specification->file-system-mapping arg #f)
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result)))
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(option '(#\F "emulate-fhs") #f #f
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(lambda (opt name arg result)
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(alist-cons 'emulate-fhs? #t result)))
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(option '(#\r "root") #t #f
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(lambda (opt name arg result)
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(alist-cons 'gc-root arg result)))
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@ -375,6 +382,65 @@ (define (input->requisites input)
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input->requisites inputs)))
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(return (delete-duplicates (concatenate reqs)))))
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(define (setup-fhs profile)
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"Setup the FHS container by creating and linking expected directories from
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PROFILE (other bind mounts are done in LAUNCH-ENVIRONMENT/CONTAINER),
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providing a symlink for CC if GCC is in the container PROFILE, and writing
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/etc/ld.so.conf."
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;; Additional symlinks for an FHS container.
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(define fhs-symlinks
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`(("/lib" . "/usr/lib")
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,(if (target-64bit?)
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'("/lib" . "/lib64")
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'("/lib" . "/lib32"))
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("/bin" . "/usr/bin")
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("/sbin" . "/usr/sbin")))
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;; A procedure to symlink the contents (at the top level) of a directory,
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;; excluding the directory itself and parent, along with any others provided
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;; in EXCLUDE.
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(define* (link-contents dir #:key (exclude '()))
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(for-each (lambda (file)
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(symlink (string-append profile dir "/" file)
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(string-append dir "/" file)))
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(scandir (string-append profile dir)
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(negate (cut member <>
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(append exclude '("." ".." )))))))
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;; The FHS container sets up the expected filesystem through MAPPINGS with
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;; FHS-MAPPINGS (in LAUNCH-ENVIRONMENT/CONTAINER), the symlinks through
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;; FHS-SYMLINKS, and linking the contents of PROFILE/bin and PROFILE/etc
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;; using LINK-CONTENTS, as these both have or will have contents for a
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;; non-FHS container so must be handled separately.
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(mkdir-p "/usr")
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(for-each (lambda (link)
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(if (file-exists? (car link))
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(symlink (car link) (cdr link))))
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fhs-symlinks)
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(link-contents "/bin" #:exclude '("sh"))
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(mkdir-p "/etc")
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(link-contents "/etc")
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;; Provide a frequently expected 'cc' symlink to gcc (in case it is in
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;; PROFILE), though this could also be done by the user in the container,
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;; e.g. in $HOME/.local/bin and adding that to $PATH. Note: we do this in
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;; /bin since that already has the sh symlink and the other (optional) FHS
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;; bin directories will link to /bin.
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(let ((gcc-path (string-append profile "/bin/gcc")))
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(if (file-exists? gcc-path)
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(symlink gcc-path "/bin/cc")))
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;; Guix's ldconfig doesn't search in FHS default locations, so provide a
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;; minimal ld.so.conf.
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(call-with-output-file "/etc/ld.so.conf"
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(lambda (port)
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(for-each (lambda (directory)
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(display directory port)
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(newline port))
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;; /lib/nss is needed as Guix's nss puts libraries
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;; there rather than in the lib directory.
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'("/lib" "/lib/nss")))))
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(define (status->exit-code status)
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"Compute the exit code made from STATUS, a value as returned by 'waitpid',
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and suitable for 'exit'."
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@ -386,11 +452,13 @@ (define exit/status (compose exit status->exit-code))
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(define primitive-exit/status (compose primitive-exit status->exit-code))
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(define* (launch-environment command profile manifest
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#:key pure? (white-list '()))
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#:key pure? (white-list '())
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emulate-fhs?)
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"Run COMMAND in a new environment containing INPUTS, using the native search
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paths defined by the list PATHS. When PURE?, pre-existing environment
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variables are cleared before setting the new ones, except those matching the
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regexps in WHITE-LIST."
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regexps in WHITE-LIST. When EMULATE-FHS?, first set up an FHS environment
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with $PATH and generate the LD cache."
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;; Properly handle SIGINT, so pressing C-c in an interactive terminal
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;; application works.
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(sigaction SIGINT SIG_DFL)
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@ -406,6 +474,12 @@ (define* (launch-environment command profile manifest
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((program . args)
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(catch 'system-error
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(lambda ()
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(when emulate-fhs?
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;; When running in a container with EMULATE-FHS?, override $PATH
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;; (optional, but to better match FHS expectations), and generate
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;; /etc/ld.so.cache.
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(setenv "PATH" "/bin:/usr/bin:/sbin:/usr/sbin")
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(invoke "ldconfig" "-X"))
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(apply execlp program program args))
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(lambda _
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;; Report the error from here because the parent process cannot
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@ -604,16 +678,24 @@ (define* (launch-environment/fork command profile manifest
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(define* (launch-environment/container #:key command bash user user-mappings
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profile manifest link-profile? network?
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map-cwd? (white-list '()))
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map-cwd? emulate-fhs? (setup-hook #f)
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(white-list '()))
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"Run COMMAND within a container that features the software in PROFILE.
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Environment variables are set according to the search paths of MANIFEST.
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The global shell is BASH, a file name for a GNU Bash binary in the
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store. When NETWORK?, access to the host system network is permitted.
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USER-MAPPINGS, a list of file system mappings, contains the user-specified
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host file systems to mount inside the container. If USER is not #f, each
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target of USER-MAPPINGS will be re-written relative to '/home/USER', and USER
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will be used for the passwd entry. LINK-PROFILE? creates a symbolic link from
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~/.guix-profile to the environment profile.
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Environment variables are set according to the search paths of MANIFEST. The
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global shell is BASH, a file name for a GNU Bash binary in the store. When
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NETWORK?, access to the host system network is permitted. USER-MAPPINGS, a
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list of file system mappings, contains the user-specified host file systems to
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mount inside the container. If USER is not #f, each target of USER-MAPPINGS
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will be re-written relative to '/home/USER', and USER will be used for the
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passwd entry.
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When EMULATE-FHS?, set up the container to follow the Filesystem Hierarchy
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Standard and provide a glibc that reads the cache from /etc/ld.so.cache.
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SETUP-HOOK is an additional setup procedure to be called, currently only used
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with the EMULATE-FHS? option.
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LINK-PROFILE? creates a symbolic link from ~/.guix-profile to the
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environment profile.
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Preserve environment variables whose name matches the one of the regexps in
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WHILE-LIST."
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@ -621,6 +703,21 @@ (define (optional-mapping->fs mapping)
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(and (file-exists? (file-system-mapping-source mapping))
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(file-system-mapping->bind-mount mapping)))
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;; File system mappings for an FHS container, where the entire directory can
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;; be mapped. Others (bin and etc) will already have contents and need to
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;; use LINK-CONTENTS (defined in SETUP-FHS) to symlink the directory
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;; contents.
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(define fhs-mappings
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(map (lambda (mapping)
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(file-system-mapping
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(source (string-append profile (car mapping)))
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(target (cdr mapping))))
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'(("/lib" . "/lib")
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("/include" . "/usr/include")
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("/sbin" . "/sbin")
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("/libexec" . "/usr/libexec")
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("/share" . "/usr/share"))))
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(mlet %store-monad ((reqs (inputs->requisites
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(list (direct-store-path bash) profile))))
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(return
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@ -675,6 +772,11 @@ (define (optional-mapping->fs mapping)
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(filter-map optional-mapping->fs
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%network-file-mappings)
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'())
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;; Mappings for an FHS container.
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(if emulate-fhs?
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(filter-map optional-mapping->fs
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fhs-mappings)
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'())
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(map file-system-mapping->bind-mount
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mappings))))
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(exit/status
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@ -702,6 +804,10 @@ (define (optional-mapping->fs mapping)
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(mkdir-p home-dir)
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(setenv "HOME" home-dir)
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;; Call an additional setup procedure, if provided.
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(when setup-hook
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(setup-hook profile))
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;; If requested, link $GUIX_ENVIRONMENT to $HOME/.guix-profile;
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;; this allows programs expecting that path to continue working as
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;; expected within a container.
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@ -743,7 +849,8 @@ (define (optional-mapping->fs mapping)
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(if link-profile?
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(string-append home-dir "/.guix-profile")
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profile)
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manifest #:pure? #f)))
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manifest #:pure? #f
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#:emulate-fhs? emulate-fhs?)))
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#:guest-uid uid
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#:guest-gid gid
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#:namespaces (if network?
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@ -872,6 +979,7 @@ (define (guix-environment* opts)
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(link-prof? (assoc-ref opts 'link-profile?))
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(network? (assoc-ref opts 'network?))
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(no-cwd? (assoc-ref opts 'no-cwd?))
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(emulate-fhs? (assoc-ref opts 'emulate-fhs?))
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(user (assoc-ref opts 'user))
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(bootstrap? (assoc-ref opts 'bootstrap?))
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(system (assoc-ref opts 'system))
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@ -915,12 +1023,22 @@ (define-syntax-rule (with-store/maybe store exp ...)
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(leave (G_ "'--user' cannot be used without '--container'~%")))
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(when (and (not container?) no-cwd?)
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(leave (G_ "--no-cwd cannot be used without --container~%")))
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(when (and (not container?) emulate-fhs?)
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(leave (G_ "'--emulate-fhs' cannot be used without '--container~'%")))
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(with-store/maybe store
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(with-status-verbosity (assoc-ref opts 'verbosity)
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(define manifest-from-opts
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(options/resolve-packages store opts))
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(options/resolve-packages
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store
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;; For an FHS-container, add the (hidden) package glibc-for-fhs
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;; which uses the global cache at /etc/ld.so.cache.
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(if emulate-fhs?
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(alist-cons 'expression
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'(ad-hoc-package "(@@ (gnu packages base) glibc-for-fhs)")
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opts)
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opts)))
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(define manifest
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(if profile
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@ -994,7 +1112,11 @@ (define manifest
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#:white-list white-list
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#:link-profile? link-prof?
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#:network? network?
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#:map-cwd? (not no-cwd?))))
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#:map-cwd? (not no-cwd?)
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#:emulate-fhs? emulate-fhs?
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#:setup-hook
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(and emulate-fhs?
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setup-fhs))))
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(else
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(return
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@ -197,3 +197,37 @@ then false;
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else
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test $? -gt 127
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fi
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# Test the Filesystem Hierarchy Standard (FHS) container option, --emulate-fhs (-F)
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# As this option requires a glibc package (glibc-for-fhs), try to run these
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# tests with the user's global store to make it easier to build or download a
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# substitute.
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storedir="`guile -c '(use-modules (guix config))(display %storedir)'`"
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localstatedir="`guile -c '(use-modules (guix config))(display %localstatedir)'`"
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NIX_STORE_DIR="$storedir"
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GUIX_DAEMON_SOCKET="$localstatedir/guix/daemon-socket/socket"
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export NIX_STORE_DIR GUIX_DAEMON_SOCKET
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if ! guile -c '(use-modules (guix)) (exit (false-if-exception (open-connection)))'
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then
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exit 77
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fi
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# Test that the container has FHS specific files/directories. Note that /bin
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# exists in a non-FHS container as it will contain sh, a symlink to the bash
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# package, so we don't test for it.
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guix environment -C --emulate-fhs --ad-hoc --bootstrap guile-bootstrap \
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-- guile -c '(exit (and (file-exists? "/etc/ld.so.cache")
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(file-exists? "/lib")
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(file-exists? "/sbin")
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(file-exists? "/usr/bin")
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(file-exists? "/usr/include")
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(file-exists? "/usr/lib")
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(file-exists? "/usr/libexec")
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(file-exists? "/usr/sbin")
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(file-exists? "/usr/share")))'
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# Test that the ld cache was generated and can be successfully read.
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guix environment -C --emulate-fhs --ad-hoc --bootstrap guile-bootstrap \
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-- guile -c '(execlp "ldconfig" "ldconfig" "-p")'
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