Building with amazon-chroot: unable to unmount

[hc-github-team-packer]

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This issue was originally opened by @anoopsaxena in https://github.com/hashicorp/packer/issues/12134 and has been migrated to this repository. The original issue description is below.

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We're trying to build a docker image using packer in a GIt jenkins Pipeline and build fails while mounting the volume, refer the log : amazon-chroot: Prevalidating AMI Name: xx-centos-7-docker-1.0.111-snapshot amazon-chroot: gathering information about this ec2 instance... amazon-chroot: Found Image Id: ami-xxxxx amazon-chroot: Checking the root device on source AMI... amazon-chroot: Creating the root volume... amazon-chroot: Attaching the root volume to /dev/sdf amazon-chroot: Mounting the root device... amazon-chroot: Error mounting root volume: exit status 1 amazon-chroot: stderr: mount: only root can use "--options" option amazon-chroot: Detaching EBS volume... amazon-chroot: Deleting the created EBS volume...

Is there a way to specify in Packer to mount the volume, Kindly suggest.,

[lbajolet-hashicorp]

Hi @anoopsaxena,

From what I can see in the logs, this is mostly because of a permission issue that the build fails. If you are using chroot, this means that you already have an EC2 instance to run your builds on, do you run the build with a user that has the permission to mount/unmount the volume you are building your AMI on? As the logs suggest, you have to invoke Packer from the instance with a root account, or with sudo if you don't want to, otherwise the OS will reject your build since mount permissions require you to run the command as the superuser.