* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd
@ 2019-10-28 17:27 Ivan Vilata i Balaguer
2019-10-29 22:16 ` Ludovic Courtès
0 siblings, 1 reply; 10+ messages in thread
From: Ivan Vilata i Balaguer @ 2019-10-28 17:27 UTC (permalink / raw)
To: 37967
Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I run
`guix environment -CN` (either as a normal user or as root) I get an error
like this:
guix environment: error: mount: mount "/var/run/nscd" on "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted
nscd is installed and working in my host machine.
This command used to work a while ago. Actually, I pulled the Guix commit
right before `5ccec771` ("file-systems: Add /var/run/nscd to
'%network-file-mappings'.") and the command seems to work again (even if I do
not replace the running daemon).
Maybe the later commit introduced some kind of regression?
Thanks and cheers!
--
Ivan Vilata i Balaguer -- https://elvil.net/
^ permalink raw reply [flat|nested] 10+ messages in thread* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-10-28 17:27 bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd Ivan Vilata i Balaguer @ 2019-10-29 22:16 ` Ludovic Courtès 2019-10-29 22:47 ` Ivan Vilata i Balaguer 0 siblings, 1 reply; 10+ messages in thread From: Ludovic Courtès @ 2019-10-29 22:16 UTC (permalink / raw) To: Ivan Vilata i Balaguer; +Cc: 37967 Bon dia Ivan, Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I run > `guix environment -CN` (either as a normal user or as root) I get an error > like this: > > guix environment: error: mount: mount "/var/run/nscd" on "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted > > nscd is installed and working in my host machine. What does ‘uname -rs’ return? What about ‘ls -ld /var/run/nscd’? > This command used to work a while ago. Actually, I pulled the Guix commit > right before `5ccec771` ("file-systems: Add /var/run/nscd to > '%network-file-mappings'.") and the command seems to work again (even if I do > not replace the running daemon). > > Maybe the later commit introduced some kind of regression? It definitely has to do with this commit, but I wonder why you’d get EPERM when bind-mounting /var/run/nscd to a different place! Gracies, Ludo’. ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-10-29 22:16 ` Ludovic Courtès @ 2019-10-29 22:47 ` Ivan Vilata i Balaguer 2019-11-01 14:26 ` Ludovic Courtès 0 siblings, 1 reply; 10+ messages in thread From: Ivan Vilata i Balaguer @ 2019-10-29 22:47 UTC (permalink / raw) To: Ludovic Courtès; +Cc: 37967, Ivan Vilata i Balaguer Salut Ludovic ! Ludovic Courtès (2019-10-29 23:16:49 +0100) wrote: > Bon dia Ivan, > > Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > > > Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I run > > `guix environment -CN` (either as a normal user or as root) I get an error > > like this: > > > > guix environment: error: mount: mount "/var/run/nscd" on "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted > > > > nscd is installed and working in my host machine. > > What does ‘uname -rs’ return? $ uname -rs Linux 5.2.0-3-amd64 > What about ‘ls -ld /var/run/nscd’? $ ls -ld /var/run/nscd drwxr-xr-x 2 root root 60 Oct 29 15:58 /var/run/nscd > > This command used to work a while ago. Actually, I pulled the Guix commit > > right before `5ccec771` ("file-systems: Add /var/run/nscd to > > '%network-file-mappings'.") and the command seems to work again (even if I do > > not replace the running daemon). > > > > Maybe the later commit introduced some kind of regression? > > It definitely has to do with this commit, but I wonder why you’d get > EPERM when bind-mounting /var/run/nscd to a different place! > > Gracies, > Ludo’. Yeah, I'm also scratching my head since switching to the previous commit immediately has it working again, so it's probably not a system config issue. `O_o` Cheers! -- Ivan Vilata i Balaguer -- https://elvil.net/ ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-10-29 22:47 ` Ivan Vilata i Balaguer @ 2019-11-01 14:26 ` Ludovic Courtès 2019-11-01 15:10 ` Ivan Vilata i Balaguer 0 siblings, 1 reply; 10+ messages in thread From: Ludovic Courtès @ 2019-11-01 14:26 UTC (permalink / raw) To: Ivan Vilata i Balaguer; +Cc: 37967 Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > Salut Ludovic ! Hola! :-) > Ludovic Courtès (2019-10-29 23:16:49 +0100) wrote: > >> Bon dia Ivan, >> >> Ivan Vilata i Balaguer <ivan@selidor.net> skribis: >> >> > Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I run >> > `guix environment -CN` (either as a normal user or as root) I get an error >> > like this: >> > >> > guix environment: error: mount: mount "/var/run/nscd" on "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted >> > >> > nscd is installed and working in my host machine. >> >> What does ‘uname -rs’ return? > > $ uname -rs > Linux 5.2.0-3-amd64 > >> What about ‘ls -ld /var/run/nscd’? > > $ ls -ld /var/run/nscd > drwxr-xr-x 2 root root 60 Oct 29 15:58 /var/run/nscd Hmm, what does this command return: mkdir /tmp/tt unshare -mUr mount --bind /var/run/nscd /tmp/tt ? What about a read-only bind mount like this: unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt ? What if you try bind-mounting a directory owned by your user? mkdir /tmp/mine unshare -mUr mount --bind /tmp/mine /tmp/tt ? Thanks in advance, Ludo’. ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-01 14:26 ` Ludovic Courtès @ 2019-11-01 15:10 ` Ivan Vilata i Balaguer 2019-11-04 3:23 ` Ivan Vilata i Balaguer 0 siblings, 1 reply; 10+ messages in thread From: Ivan Vilata i Balaguer @ 2019-11-01 15:10 UTC (permalink / raw) To: Ludovic Courtès; +Cc: 37967, Ivan Vilata i Balaguer Ludovic Courtès (2019-11-01 15:26:27 +0100) wrote: > Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > > > Ludovic Courtès (2019-10-29 23:16:49 +0100) wrote: > >> > >> Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > >> > >> > Hi! While using Guix commit `c9fc03a3` on Debian unstable, whenever I run > >> > `guix environment -CN` (either as a normal user or as root) I get an error > >> > like this: > >> > > >> > guix environment: error: mount: mount "/var/run/nscd" on "/tmp/guix-directory.6kBgXe//var/run/nscd": Operation not permitted > >> > > >> > nscd is installed and working in my host machine. > >> > >> What does ‘uname -rs’ return? > > > > $ uname -rs > > Linux 5.2.0-3-amd64 > > > >> What about ‘ls -ld /var/run/nscd’? > > > > $ ls -ld /var/run/nscd > > drwxr-xr-x 2 root root 60 Oct 29 15:58 /var/run/nscd > > Hmm, what does this command return: > > mkdir /tmp/tt > unshare -mUr mount --bind /var/run/nscd /tmp/tt > > ? $ mkdir /tmp/tt $ unshare -mUr mount --bind /var/run/nscd /tmp/tt && echo ok ok > What about a read-only bind mount like this: > > unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt > > ? This one looks more interesting: $ unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt && echo ok mount: /tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005. $ echo $? 32 > What if you try bind-mounting a directory owned by your user? > > mkdir /tmp/mine > unshare -mUr mount --bind /tmp/mine /tmp/tt > > ? $ mkdir /tmp/mine $ unshare -mUr mount --bind /tmp/mine /tmp/tt && echo ok ok > Thanks in advance, > Ludo’. Thanks to you! Saluton, -- Ivan Vilata i Balaguer -- https://elvil.net/ ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-01 15:10 ` Ivan Vilata i Balaguer @ 2019-11-04 3:23 ` Ivan Vilata i Balaguer 2019-11-04 17:07 ` Ludovic Courtès 0 siblings, 1 reply; 10+ messages in thread From: Ivan Vilata i Balaguer @ 2019-11-04 3:23 UTC (permalink / raw) To: Ivan Vilata i Balaguer; +Cc: 37967 Ivan Vilata i Balaguer (2019-11-01 11:10:02 -0400) wrote: > Ludovic Courtès (2019-11-01 15:26:27 +0100) wrote: > > > […] What about a read-only bind mount like this: > > > > unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt > > > > ? > > This one looks more interesting: > > $ unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt && echo ok > mount: /tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005. > $ echo $? > 32 BTW, I ran that under strace and it looks like the read-only remount fails after mounting `/var/run/nscd` in the new namespace has succeeded: $ strace -f unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt […] access("/run/mount", R_OK|W_OK) = -1 EACCES (Permission denied) mount("/run/nscd", "/tmp/tt", 0x14c25b0, MS_RDONLY|MS_BIND, NULL) = 0 mount("none", "/tmp/tt", NULL, MS_RDONLY|MS_REMOUNT|MS_BIND, NULL) = -1 EPERM (Operation not permitted) write(2, "mount: ", 7mount: ) = 7 write(2, "/tmp/tt: filesystem was mounted,"..., 89/tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005.) = 89 write(2, "\n", 1 […] Cheers! -- Ivan Vilata i Balaguer -- https://elvil.net/ ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-04 3:23 ` Ivan Vilata i Balaguer @ 2019-11-04 17:07 ` Ludovic Courtès 2019-11-04 21:23 ` Ivan Vilata i Balaguer 0 siblings, 1 reply; 10+ messages in thread From: Ludovic Courtès @ 2019-11-04 17:07 UTC (permalink / raw) To: Ivan Vilata i Balaguer; +Cc: 37967 [-- Attachment #1: Type: text/plain, Size: 1700 bytes --] Saluton! Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > Ivan Vilata i Balaguer (2019-11-01 11:10:02 -0400) wrote: > >> Ludovic Courtès (2019-11-01 15:26:27 +0100) wrote: >> >> > […] What about a read-only bind mount like this: >> > >> > unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt >> > >> > ? >> >> This one looks more interesting: >> >> $ unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt && echo ok >> mount: /tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005. >> $ echo $? >> 32 > > BTW, I ran that under strace and it looks like the read-only remount fails > after mounting `/var/run/nscd` in the new namespace has succeeded: > > $ strace -f unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt > […] > access("/run/mount", R_OK|W_OK) = -1 EACCES (Permission denied) > mount("/run/nscd", "/tmp/tt", 0x14c25b0, MS_RDONLY|MS_BIND, NULL) = 0 > mount("none", "/tmp/tt", NULL, MS_RDONLY|MS_REMOUNT|MS_BIND, NULL) = -1 EPERM (Operation not permitted) > write(2, "mount: ", 7mount: ) = 7 > write(2, "/tmp/tt: filesystem was mounted,"..., 89/tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005.) = 89 > write(2, "\n", 1 > […] Weird, why does it remount it? What does: mount | grep /run returns? I just tried on a Debian 10 image with Linux 4.19.0 and /run is a tmpfs, which may be the reason why read-only bind-mounts fail (or at least there’s a bug in that area.) Anyway, below is a patch for you to test. Let me know how it goes. :-) Thanks, Ludo’. [-- Warning: decoded text below may be mangled, UTF-8 assumed --] [-- Attachment #2: Type: text/x-patch, Size: 759 bytes --] diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm index 6cf6ccc53e..6cdb2b749d 100644 --- a/gnu/system/file-systems.scm +++ b/gnu/system/file-systems.scm @@ -507,7 +507,8 @@ a bind mount." ;; XXX: On some GNU/Linux systems, /etc/resolv.conf is a ;; symlink to a file in a tmpfs which, for an unknown reason, ;; cannot be bind mounted read-only within the container. - (writable? (string=? file "/etc/resolv.conf")))) + (writable? (or (string=? file "/etc/resolv.conf") + (string=? file "/var/run/nscd"))))) (cons "/var/run/nscd" %network-configuration-files))) (define (file-system-type-predicate type) ^ permalink raw reply related [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-04 17:07 ` Ludovic Courtès @ 2019-11-04 21:23 ` Ivan Vilata i Balaguer 2019-11-04 22:37 ` Ludovic Courtès 0 siblings, 1 reply; 10+ messages in thread From: Ivan Vilata i Balaguer @ 2019-11-04 21:23 UTC (permalink / raw) To: Ludovic Courtès; +Cc: 37967, Ivan Vilata i Balaguer Ludovic Courtès (2019-11-04 18:07:05 +0100) wrote: > Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > > > BTW, I ran that under strace and it looks like the read-only remount fails > > after mounting `/var/run/nscd` in the new namespace has succeeded: > > > > $ strace -f unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt > > […] > > access("/run/mount", R_OK|W_OK) = -1 EACCES (Permission denied) > > mount("/run/nscd", "/tmp/tt", 0x14c25b0, MS_RDONLY|MS_BIND, NULL) = 0 > > mount("none", "/tmp/tt", NULL, MS_RDONLY|MS_REMOUNT|MS_BIND, NULL) = -1 EPERM (Operation not permitted) > > write(2, "mount: ", 7mount: ) = 7 > > write(2, "/tmp/tt: filesystem was mounted,"..., 89/tmp/tt: filesystem was mounted, but any subsequent operation failed: Unknown error 5005.) = 89 > > write(2, "\n", 1 > > […] > > Weird, why does it remount it? > > What does: > > mount | grep /run $ mount | grep /run tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1641444k,mode=755) […] > returns? I just tried on a Debian 10 image with Linux 4.19.0 and /run > is a tmpfs, which may be the reason why read-only bind-mounts fail (or > at least there’s a bug in that area.) > > Anyway, below is a patch for you to test. Let me know how it goes. :-) > > Thanks, > Ludo’. I applied your patch on top of bf7b08c4, pulled Guix and did successfully start `guix environment -CN`, with network support and all. Cool! `:)` > diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm > index 6cf6ccc53e..6cdb2b749d 100644 > --- a/gnu/system/file-systems.scm > +++ b/gnu/system/file-systems.scm > @@ -507,7 +507,8 @@ a bind mount." > ;; XXX: On some GNU/Linux systems, /etc/resolv.conf is a > ;; symlink to a file in a tmpfs which, for an unknown reason, > ;; cannot be bind mounted read-only within the container. > - (writable? (string=? file "/etc/resolv.conf")))) > + (writable? (or (string=? file "/etc/resolv.conf") > + (string=? file "/var/run/nscd"))))) > (cons "/var/run/nscd" %network-configuration-files))) > > (define (file-system-type-predicate type) -- Ivan Vilata i Balaguer -- https://elvil.net/ ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-04 21:23 ` Ivan Vilata i Balaguer @ 2019-11-04 22:37 ` Ludovic Courtès 2019-11-08 19:07 ` Björn Höfling 0 siblings, 1 reply; 10+ messages in thread From: Ludovic Courtès @ 2019-11-04 22:37 UTC (permalink / raw) To: Ivan Vilata i Balaguer; +Cc: 37967-done Hi, Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > I applied your patch on top of bf7b08c4, pulled Guix and did successfully > start `guix environment -CN`, with network support and all. Awesome, pushed as 625bdf09d344302ec2d5da7f35fe35ca1d128a93. Gràcies! :-) Ludo’. ^ permalink raw reply [flat|nested] 10+ messages in thread
* bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd 2019-11-04 22:37 ` Ludovic Courtès @ 2019-11-08 19:07 ` Björn Höfling 0 siblings, 0 replies; 10+ messages in thread From: Björn Höfling @ 2019-11-08 19:07 UTC (permalink / raw) To: Ludovic Courtès; +Cc: Ivan Vilata i Balaguer, 37967-done [-- Attachment #1: Type: text/plain, Size: 512 bytes --] On Mon, 04 Nov 2019 23:37:07 +0100 Ludovic Courtès <ludo@gnu.org> wrote: > Hi, > > Ivan Vilata i Balaguer <ivan@selidor.net> skribis: > > > I applied your patch on top of bf7b08c4, pulled Guix and did > > successfully start `guix environment -CN`, with network support and > > all. > > Awesome, pushed as 625bdf09d344302ec2d5da7f35fe35ca1d128a93. Hi, I had the same issue and was too lazy to report. I can confirm that the commit fixed it. Thanks for reporting and fixing. Björn [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 195 bytes --] ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2019-11-08 19:08 UTC | newest] Thread overview: 10+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2019-10-28 17:27 bug#37967: guix environment -CN: Operation not permitted mounting host's /var/run/nscd Ivan Vilata i Balaguer 2019-10-29 22:16 ` Ludovic Courtès 2019-10-29 22:47 ` Ivan Vilata i Balaguer 2019-11-01 14:26 ` Ludovic Courtès 2019-11-01 15:10 ` Ivan Vilata i Balaguer 2019-11-04 3:23 ` Ivan Vilata i Balaguer 2019-11-04 17:07 ` Ludovic Courtès 2019-11-04 21:23 ` Ivan Vilata i Balaguer 2019-11-04 22:37 ` Ludovic Courtès 2019-11-08 19:07 ` Björn Höfling
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