nerdctl fails to build for dockerfiles with full path

[seemethere]

nerdctl installed with rootless containerd and buildkit fails to build dockerfiles when the dockerfile specified is a full path:

Simple Repro

Create test Dockerfile in your root directory (Dockerfile):

FROM alpine
RUN apk -U add curl

Run the following

$ nerdctl build -f $(realpath Dockerfile) .
[+] Building 0.1s (2/2) FINISHED                                                                                                                          
 => [internal] load build definition from /tmp/tmp.gdczD7DusJ/Dockerfile                                                                             0.1s
 => => transferring dockerfile: 2B                                                                                                                   0.0s
 => [internal] load .dockerignore                                                                                                                    0.1s
 => => transferring context: 2B                                                                                                                      0.0s
error: failed to solve: rpc error: code = Unknown desc = failed to solve with frontend dockerfile.v0: failed to read dockerfile: open /tmp/buildkit-mount044783237/tmp/tmp.gdczD7DusJ/Dockerfile: no such file or directory
FATA[0000] unrecognized image format   

[fahedouch]

Actually we don't support this

nerdctl/build.go

Line 147 in 3668d7d

"--local=dockerfile=" + buildContext,

The dockerfile context is the same as the build context.
I will fix this.

Have a Nice day

[andel7]

Was this fixed ? I can't build image from Dockerfiles with the same error

[pmmlo]

@andel7 Probably already moved on, but for future searchers.

This sounds stupid, but try running the build command at least 3 times after failure (if you know the Dockerfile works with Docker/docker CLI). For me, it progresses a little further each time until it succeeds in building a new image from Dockerfile.

[AkihiroSuda]

Already fixed in nerdctl v0.8.2:

• fix dockerfile context #207

I also tested v0.19.0 locally and I don't see any regression.

[AkihiroSuda]

@andel7 Are you seeing this error with Lima/Colima/Rancher Desktop?
If so, please make sure that your Dockerfile is located under /Users or any directory that is exposed to Lima.

[Cerebus]

@andel7 Are you seeing this error with Lima/Colima/Rancher Desktop? If so, please make sure that your Dockerfile is located under /Users or any directory that is exposed to Lima.

Yes, and yes it is, but still getting this error.

nerdctl version 0.20.0

[Cerebus]

Oh, nevermind. The problem was between the keyboard and the chair.

[ArVar]

I have a very similar issue:

 => [internal] load build definition from Dockerfile                                                              0.0s 
 => => transferring dockerfile: 2B                                                                                0.0s 
 => [internal] load .dockerignore                                                                                 0.0s 
 => => transferring context: 2B                                                                                   0.0s 
error: failed to solve: failed to read dockerfile: open /tmp/buildkit-mount3778739720/Dockerfile: no such file or direc
tory
FATA[0000] unrecognized image format

I'm pretty sure, there is something going wrong in passing the data from the context to the builder, i.e. the Dockerfile.
Using Rancher Desktop on windows 10 with WSL2 Ubuntu.
Edit: Rancher Desktop 1.4.1, nerdctl 0.20.0

[RPM8887]

I have a very similar issue:

 => [internal] load build definition from Dockerfile                                                              0.0s 
 => => transferring dockerfile: 2B                                                                                0.0s 
 => [internal] load .dockerignore                                                                                 0.0s 
 => => transferring context: 2B                                                                                   0.0s 
error: failed to solve: failed to read dockerfile: open /tmp/buildkit-mount3778739720/Dockerfile: no such file or direc
tory
FATA[0000] unrecognized image format

I'm pretty sure, there is something going wrong in passing the data from the context to the builder, i.e. the Dockerfile. Using Rancher Desktop on windows 10 with WSL2 Ubuntu. Edit: Rancher Desktop 1.4.1, nerdctl 0.20.0

The way I got this to work in Windows with your same config is by issuing the nerdctl command from an elevated command prompt/running as admin