podman build does not reuse cache when current directory changed

[shaicoleman]

/kind bug

Description

When changing the directory context, the cache isn't used, even if it points to the same directory.

Steps to reproduce the issue:

sudo podman build --rm --file rails/Dockerfile -t myimage ..
cd ..
sudo podman build --rm --file docker/rails/Dockerfile -t myimage .

Output of podman version:

Version:            1.5.0
RemoteAPI Version:  1
Go Version:         go1.10.4
OS/Arch:            linux/amd64

Output of podman info --debug:
debug:
compiler: gc
git commit: ""
go version: go1.10.4
podman version: 1.5.0
host:
BuildahVersion: 1.10.1
Conmon:
package: 'conmon: /usr/libexec/podman/conmon'
path: /usr/libexec/podman/conmon
version: 'conmon version 2.0.0, commit: unknown'
Distribution:
distribution: linuxmint
version: "19.2"
MemFree: 5022597120
MemTotal: 16622612480
OCIRuntime:
package: 'containerd.io: /usr/bin/runc'
path: /usr/bin/runc
version: |-
runc version 1.0.0-rc8
commit: 425e105d5a03fabd737a126ad93d62a9eeede87f
spec: 1.0.1-dev
SwapFree: 16986927104
SwapTotal: 16986927104
arch: amd64
cpus: 12
eventlogger: journald
hostname: shai-5591
kernel: 5.0.0-25-generic
os: linux
rootless: false
uptime: 21m 22.48s
registries:
blocked: null
insecure: null
search: null
store:
ConfigFile: /etc/containers/storage.conf
ContainerStore:
number: 4
GraphDriverName: overlay
GraphOptions: null
GraphRoot: /var/lib/containers/storage
GraphStatus:
Backing Filesystem: extfs
Native Overlay Diff: "true"
Supports d_type: "true"
Using metacopy: "false"
ImageStore:
number: 35
RunRoot: /var/run/containers/storage
VolumePath: /var/lib/containers/storage/volumes

**Package info:**

podman/bionic,now 1.5.0-2~ubuntu18.04~ppa5 amd64 [installed]

[mheon]

@TomSweeneyRedHat PTAL

[rhatdan]

@shaicoleman Best to open issues against https://github.com/containers/buildah for build issues, since podman is just using buildah code to do podman build

[TomSweeneyRedHat]

I've not been able to duplicate this using Buildah v1.11.0 which should be in the next release of Podman. I'm not sure if that will be Podman 1.5.1 or Podman 1.6.0, but it will be contained that next version. I'm going to close this now as containers/buildah#1792 appears to have fixed the issue. If you find otherwise, please feel free to reopen this or create a new issue as appropriate.