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environment: container: Create dummy home directory and /etc/passwd.

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* guix/scripts/environment.scm (launch-environment/container): Change
$HOME to the current user's home directory instead of
/homeless-shelter.  Create a dummy /etc/passwd with a single entry for
the current user.
* doc/guix.texi ("invoking guix environment"): Add a note about the
dummy home directory and /etc/passwd.
This commit is contained in:
David Thompson 2016-03-17 23:19:25 -04:00
parent bf9eacd2af
commit a01ad63893
2 changed files with 29 additions and 17 deletions
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9
doc/guix.texi
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@ -5338,10 +5338,11 @@ Attempt to build for @var{system}---e.g., @code{i686-linux}.
@itemx -C @itemx -C
@cindex container @cindex container
Run @var{command} within an isolated container. The current working Run @var{command} within an isolated container. The current working
directory outside the container is mapped inside the directory outside the container is mapped inside the container.
container. Additionally, the spawned process runs as the current user Additionally, a dummy home directory is created that matches the current
outside the container, but has root privileges in the context of the user's home directory, and @file{/etc/passwd} is configured accordingly.
container. The spawned process runs as the current user outside the container, but
has root privileges in the context of the container.
@item --network @item --network
@itemx -N @itemx -N

31
guix/scripts/environment.scm
View file

@ -373,6 +373,7 @@ host file systems to mount inside the container."
(list (direct-store-path bash) profile)))) (list (direct-store-path bash) profile))))
(return (return
(let* ((cwd (getcwd)) (let* ((cwd (getcwd))
(passwd (getpwuid (getuid)))
;; Bind-mount all requisite store items, user-specified mappings, ;; Bind-mount all requisite store items, user-specified mappings,
;; /bin/sh, the current working directory, and possibly networking ;; /bin/sh, the current working directory, and possibly networking
;; configuration files within the container. ;; configuration files within the container.
@ -417,16 +418,26 @@ host file systems to mount inside the container."
;; The same variables as in Nix's 'build.cc'. ;; The same variables as in Nix's 'build.cc'.
'("TMPDIR" "TEMPDIR" "TMP" "TEMP")) '("TMPDIR" "TEMPDIR" "TMP" "TEMP"))
;; From Nix build.cc: ;; Create a dummy home directory under the same name as on the
;; ;; host.
;; Set HOME to a non-existing path to prevent certain (mkdir-p (passwd:dir passwd))
;; programs from using /etc/passwd (or NIS, or whatever) (setenv "HOME" (passwd:dir passwd))
;; to locate the home directory (for example, wget looks
;; for ~/.wgetrc). I.e., these tools use /etc/passwd if ;; Create a dummy /etc/passwd to satisfy applications that demand
;; HOME is not set, but they will just assume that the ;; to read it, such as 'git clone' over SSH, a valid use-case when
;; settings file they are looking for does not exist if ;; sharing the host's network namespace.
;; HOME is set but points to some non-existing path. (mkdir-p "/etc")
(setenv "HOME" "/homeless-shelter") (call-with-output-file "/etc/passwd"
(lambda (port)
(display (string-join (list (passwd:name passwd)
"x" ; but there is no shadow
"0" "0" ; user is now root
(passwd:gecos passwd)
(passwd:dir passwd)
bash)
":")
port)
(newline port)))
;; For convenience, start in the user's current working ;; For convenience, start in the user's current working
;; directory rather than the root directory. ;; directory rather than the root directory.