plash purge

Usage

plash purge [ --yes ]

Description

Deletes all build data unatomically. Running containers that rely on the
build data will enter an undefined state. Plashs behaviour while this command
did not finish running returning an non zero exit code is undefined. The
data directory itself is not deleted as it could be a mountpoint.

Tested Behaviour

#!/bin/sh

set -eux

• Purge deletes plash data when confirmed

export PLASH_DATA=$(mktemp -d)

plash init

echo 'y' | plash purge

out=$(ls -A $PLASH_DATA)

! test -n "$out"

• Purge does not deletes plash data when confirmed badly

export PLASH_DATA=$(mktemp -d)

plash init

set +ex

echo 'jap' | plash purge

set -ex

out=$(ls -A $PLASH_DATA)

test -n "$out"

• purge two times

export PLASH_DATA=$(mktemp -d)

plash init

plash purge --yes

plash purge --yes

• call plash purge on empty plash data

export PLASH_DATA=$(mktemp -d)

plash purge --yes

• check that purge removes all data in the PLASH_DATA directory

export PLASH_DATA=$(mktemp -d)

plash init

out=$(ls -A $PLASH_DATA)

test -n "$out"

plash purge --yes

out=$(ls -A $PLASH_DATA)

test -z "$out"

• not confirming does not delete the data

export PLASH_DATA=$(mktemp -d)

plash init

set +ex

echo 'no' | plash purge

set -ex

out=$(ls -A $PLASH_DATA)

test -n "$out"

• Bad confirmation leads to bad exit satus

! echo no | plash purge

Source Code

#define USAGE "usage: plash purge [ --yes ]\n"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <plash.h>

int confirm_via_input() {
  printf("Delete all build data? [y/N] ");
  char inp[sizeof("y\n")];
  fgets(inp, sizeof(inp), stdin);
  return (strcmp(inp, "y\n") == 0);
}

int is_confirmed_via_argv(char **argv) {
  return (argv[1] && (strcmp(argv[1], "--yes") == 0));
}

int purge_main(int argc, char *argv[]) {

  if (!(is_confirmed_via_argv(argv) || confirm_via_input())) {
    fputs("Action not confirmed\n", stderr);
    return EXIT_FAILURE;
  }

  pl_unshare_user();

  char *plash_data = pl_call("data");
  if (chdir(plash_data) == -1)
    pl_fatal("chdir %s", plash_data);

  // this one first
  pl_run("rm", "rm", "-rf", "id_counter", NULL);

  pl_run("rm", "-rf", "index");
  pl_run("rm", "-rf", "layer");
  pl_run("rm", "-rf", "map");
  pl_run("rm", "-rf", "mnt");
  pl_run("rm", "-rf", "tmp");
  fputs("All deleted.\n", stderr);
  return EXIT_SUCCESS;
}