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authorDavid Thompson <dthompson2@worcester.edu>2016-03-17 23:19:25 -0400
committerDavid Thompson <dthompson2@worcester.edu>2016-03-26 09:38:27 -0400
commita01ad63893da1f1cf1b35482037382030724716c (patch)
treef9197cf8b889c123d33fdc431f1c86e297a60467
parentbf9eacd2af770c458dbd8c18d14e1885b6246313 (diff)
downloadguix-a01ad63893da1f1cf1b35482037382030724716c.tar
guix-a01ad63893da1f1cf1b35482037382030724716c.tar.gz
environment: container: Create dummy home directory and /etc/passwd.
* guix/scripts/environment.scm (launch-environment/container): Change $HOME to the current user's home directory instead of /homeless-shelter. Create a dummy /etc/passwd with a single entry for the current user. * doc/guix.texi ("invoking guix environment"): Add a note about the dummy home directory and /etc/passwd.
-rw-r--r--doc/guix.texi15
-rw-r--r--guix/scripts/environment.scm31
2 files changed, 29 insertions, 17 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index b618480353..008a5cf714 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3292,7 +3292,7 @@ omitted since it will take place implicitly, as we will see later
@end example
@c See
-@c <https://syntaxexclamation.wordpress.com/2014/06/26/escaping-continuations/>
+@c <https://syntaxexclamation.wordpress.com/2014/06/26/escaping-continuations/>
@c for the funny quote.
Calling the monadic @code{sh-symlink} has no effect. As someone once
said, ``you exit a monad like you exit a building on fire: by running''.
@@ -4339,7 +4339,7 @@ So for instance, imagine you want to see the build log of GDB on MIPS,
but you are actually on an @code{x86_64} machine:
@example
-$ guix build --log-file gdb -s mips64el-linux
+$ guix build --log-file gdb -s mips64el-linux
https://hydra.gnu.org/log/@dots{}-gdb-7.10
@end example
@@ -5338,10 +5338,11 @@ Attempt to build for @var{system}---e.g., @code{i686-linux}.
@itemx -C
@cindex container
Run @var{command} within an isolated container. The current working
-directory outside the container is mapped inside the
-container. Additionally, the spawned process runs as the current user
-outside the container, but has root privileges in the context of the
-container.
+directory outside the container is mapped inside the container.
+Additionally, a dummy home directory is created that matches the current
+user's home directory, and @file{/etc/passwd} is configured accordingly.
+The spawned process runs as the current user outside the container, but
+has root privileges in the context of the container.
@item --network
@itemx -N
@@ -8748,7 +8749,7 @@ isn't enough disk space, just skip it.
@item fcntl
Use this if possible. Works with NFS too if lockd is used.
@item flock
-May not exist in all systems. Doesn't work with NFS.
+May not exist in all systems. Doesn't work with NFS.
@item lockf
May not exist in all systems. Doesn't work with NFS.
@end table
diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index b122b4cd40..0d5cab432c 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -373,6 +373,7 @@ host file systems to mount inside the container."
(list (direct-store-path bash) profile))))
(return
(let* ((cwd (getcwd))
+ (passwd (getpwuid (getuid)))
;; Bind-mount all requisite store items, user-specified mappings,
;; /bin/sh, the current working directory, and possibly networking
;; 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'.
'("TMPDIR" "TEMPDIR" "TMP" "TEMP"))
- ;; From Nix build.cc:
- ;;
- ;; Set HOME to a non-existing path to prevent certain
- ;; programs from using /etc/passwd (or NIS, or whatever)
- ;; to locate the home directory (for example, wget looks
- ;; for ~/.wgetrc). I.e., these tools use /etc/passwd if
- ;; HOME is not set, but they will just assume that the
- ;; settings file they are looking for does not exist if
- ;; HOME is set but points to some non-existing path.
- (setenv "HOME" "/homeless-shelter")
+ ;; Create a dummy home directory under the same name as on the
+ ;; host.
+ (mkdir-p (passwd:dir passwd))
+ (setenv "HOME" (passwd:dir passwd))
+
+ ;; Create a dummy /etc/passwd to satisfy applications that demand
+ ;; to read it, such as 'git clone' over SSH, a valid use-case when
+ ;; sharing the host's network namespace.
+ (mkdir-p "/etc")
+ (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
;; directory rather than the root directory.