From: Hartmut Goebel <h.goebel@crazy-compilers.com>
To: guix-devel <guix-devel@gnu.org>
Subject: Curious unionfs-ro-mount for /gnu/store in installation-image
Date: Sun, 29 Oct 2017 18:18:08 +0100 [thread overview]
Message-ID: <de29f139-af5c-a367-1aa1-c0365c2a5466@crazy-compilers.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 1654 bytes --]
Hello,
immediately after booting the installation image (build according to [1]
and run according to [2]), the "mount" command spits out *two* unionfs
mounted points:
root@gnu ~# mount
unionfs on / type fuse.unionfs (rw,…)
unionfs on /gnu/store type fuse.unionfs (ro,…)
The first one ("/") is easy to explain: It is created by
gnu/build/linux-boot.scm (mount-root-file-system) if #:volatile-root is
true.
But I'm curious, where the second one comes from. I've been searching
this for two or three hours now and did not find, where this is defined.
- unionfs is used twice only in the whole code:
1) In gnu/build/linux-boot.scm (mount-root-files-ystem) to make a
unionfs root – this is our first case
2) in gnu/system/install.scm (make-cow-store) – which is not started
yet.
- gnu/system/install.scm defines the system to be put into the
installation image. Thuns I thought it may be a file-system defined in
install.scm. But related to the store there is only %immutable-store,
which does not use unionfs a ro-bind-mount, not a unionfs.
- I tried to find some hint in the disk-image, but did not. I found
"shepherd-file-system--gnu-store.scm", which implements %immutable-store".
Any ideas where this second unionfs-mount comes from?
[1]
https://www.gnu.org/software/guix/manual/guix.html#Building-the-Installation-Image
[2]
https://www.gnu.org/software/guix/manual/guix.html#Installing-GuixSD-in-a-VM
--
Regards
Hartmut Goebel
| Hartmut Goebel | h.goebel@crazy-compilers.com |
| www.crazy-compilers.com | compilers which you thought are impossible |
[-- Attachment #2: 0xBF773B65.asc --]
[-- Type: application/pgp-keys, Size: 14855 bytes --]
next reply other threads:[~2017-10-29 17:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-29 17:18 Hartmut Goebel [this message]
2017-10-29 17:30 ` Curious unionfs-ro-mount for /gnu/store in installation-image Tobias Geerinckx-Rice
2017-10-29 17:45 ` Hartmut Goebel
2017-10-31 1:56 ` Chris Marusich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://guix.gnu.org/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=de29f139-af5c-a367-1aa1-c0365c2a5466@crazy-compilers.com \
--to=h.goebel@crazy-compilers.com \
--cc=guix-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/guix.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).