set unix.MS_BIND flag for bind mount #1799
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always set unix.MS_BIND flag for bind mount, this fixs a error reporting
"no such device" with following mount configration, which is similar to
mount --bind oldidr newdir
{
"destination": "/host_dir",
"type": "bind",
"source": "host_dir"
}
Without this change, we always have to set the "options":
["rbind"], which will add the flag unix.MS_BIND in parseMountOptions.
Alternative fix is to add option "bind" to Mount.Options when it is bind
mount so the right flag can be set in parseMountOptions.
Signed-off-by: Bin Chen <nk@devicu.com>
|
Rejected -- |
|
On Tue, 8 May 2018 at 7:50 pm, Aleksa Sarai ***@***.***> wrote:
Reject -- type: "bind" is not a valid way of specifying bind-mounts in
the OCI specification. Unfortunately quite a few people have used it
historically, leading to confusion (and the code itself used to depend on
it as well -- which is a mess as well).
I agree with you and using bind as a type in the code did cause a lot
confusion for me.
So what would be spec compatible way to use bind mount? What should be type
in that case? using bind as a type is in many place in lastest code base ,
both code and doc. We have to fix the those first.
Fwiw, the change here imo didn't make thing worse/messier, but again I
agree using bind as type isn't spec compatible.
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--
Chen Bin
|
|
Here is the example used in the runtime-spec. |
binchenX
pushed a commit
to binchenX/runtime-spec
that referenced
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May 9, 2018
Per spec, "bind" is not a valid mount type. To use bind mount,
the spec compatible way is to set either "bind" or "rbind"
in the mount options.
Although in practice, setting the type as "bind" won't actually
cause an error (at the moment using runc, as well as the system
call mount(7) itself) as long as either "bind" or "rbind" is set
as well, it provide an incorrect example that "bind" is avalid
type, and make people think following config is a valid one for
bind mount, which in fact will throw an error in runc.
{
"destination": "/data",
"type": "bind"
"source": "/volumes/testing",
}
[1] tried to automatically add a MS_BIND flag when the type is "bind"
but was rejected on the ground it "encourage" the incorrect usage of
bind as the mount type, which I agree. Hence, here I change the example
in the spec in the hope making it clearer that for bind mount to work,
we should use the correct mount options, instead of the "bind" mount type.
[1]opencontainers/runc#1799
Signed-off-by: Bin Chen <Bin Chen nk@devicu.com>
Signed-off-by: Bin Chen <Bin Chen nk@devicu.com>
binchenX
pushed a commit
to binchenX/runtime-spec
that referenced
this pull request
May 9, 2018
Per spec, "bind" is not a valid mount type. To use bind mount,
the spec compatible way is to set either "bind" or "rbind"
in the mount options.
Although in practice, setting the type as "bind" won't actually
cause an error (at the moment using runc, as well as the system
call mount(7) itself) as long as either "bind" or "rbind" is set
as well, it provide an incorrect example that "bind" is avalid
type, and make people think following config is a valid one for
bind mount, which in fact will throw an error in runc.
{
"destination": "/data",
"type": "bind"
"source": "/volumes/testing",
}
[1] tried to automatically add a MS_BIND flag when the type is "bind"
but was rejected on the ground it "encourage" the incorrect usage of
bind as the mount type, which I agree. Hence, here I change the example
in the spec in the hope making it clearer that for bind mount to work,
we should use the correct mount options, instead of the "bind" mount type.
[1]opencontainers/runc#1799
Signed-off-by: Bin Chen <Bin Chen nk@devicu.com>
binchenX
pushed a commit
to binchenX/runtime-spec
that referenced
this pull request
May 9, 2018
Per spec, "bind" is not a valid mount type. To use bind mount,
the spec compatible way is to set either "bind" or "rbind"
in the mount options.
Although in practice, setting the type as "bind" won't actually
cause an error (at the moment using runc, as well as the system
call mount(7) itself) as long as either "bind" or "rbind" is set
as well, it provide an incorrect example that "bind" is avalid
type, and make people think following config is a valid one for
bind mount, which in fact will throw an error in runc.
{
"destination": "/data",
"type": "bind"
"source": "/volumes/testing",
}
[1] tried to automatically add a MS_BIND flag when the type is "bind"
but was rejected on the ground it "encourage" the incorrect usage of
bind as the mount type, which I agree. Hence, here I change the example
in the spec in the hope making it clearer that for bind mount to work,
we should use the correct mount options, instead of the "bind" mount type.
[1]opencontainers/runc#1799
Signed-off-by: Bin Chen <nk@devicu.com>
binchenX
added a commit
to binchenX/runtime-spec
that referenced
this pull request
May 9, 2018
Per spec, "bind" is not a valid mount type. To use bind mount,
the spec compatible way is to set either "bind" or "rbind"
in the mount options.
Although in practice, setting the type as "bind" won't actually
cause an error (at the moment using runc, as well as the system
call mount(7) itself) as long as either "bind" or "rbind" is set
as well, it provide an incorrect example that "bind" is avalid
type, and make people think following config is a valid one for
bind mount, which in fact will throw an error in runc.
{
"destination": "/data",
"type": "bind"
"source": "/volumes/testing",
}
[1] tried to automatically add a MS_BIND flag when the type is "bind"
but was rejected on the ground it "encourage" the incorrect usage of
bind as the mount type, which I agree. Hence, here I change the example
in the spec in the hope making it clearer that for bind mount to work,
we should use the correct mount options, instead of the "bind" mount type.
[1]opencontainers/runc#1799
Signed-off-by: Bin Chen <nk@devicu.com>
binchenX
added a commit
to binchenX/runtime-spec
that referenced
this pull request
May 9, 2018
Per spec, "bind" is not a valid mount type. To use bind mount,
the spec compatible way is to set either "bind" or "rbind"
in the mount options.
Although in practice, setting the type as "bind" won't actually
cause an error (at the moment using runc, as well as the system
call mount(7) itself) as long as either "bind" or "rbind" is set
as well, it provide an incorrect example that "bind" is avalid
type, and make people think following config is a valid one for
bind mount, which in fact will throw an error in runc.
{
"destination": "/data",
"type": "bind"
"source": "/volumes/testing",
}
[1] tried to automatically add a MS_BIND flag when the type is "bind"
but was rejected on the ground it "encourage" the incorrect usage of
bind as the mount type, which I agree. Hence, here I change the example
in the spec in the hope making it clearer that for bind mount to work,
we should use the correct mount options, instead of the "bind" mount type.
[1]opencontainers/runc#1799
Signed-off-by: Bin Chen <nk@devicu.com>
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always set unix.MS_BIND flag for bind mount, this fixs a error reporting
"no such device" with following mount configration, which is similar to
mount --bind oldidr newdir
{
"destination": "/host_dir",
"type": "bind",
"source": "host_dir"
}
Without this change, we always have to set the "options":
["rbind"], which will add the flag unix.MS_BIND in parseMountOptions.
Alternative fix is to add option "bind" to Mount.Options when it is bind
mount so the right flag can be set in parseMountOptions.
Signed-off-by: Bin Chen nk@devicu.com