feat: add dosfstools (#341)

slices/dosfstools.yaml

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+package: dosfstools
+
+essential:
+  - dosfstools_copyright
+
+slices:
+  bins:
+    essential:
+      - libc6_libs
+    contents:
+      /usr/sbin/dosfsck:
+      /usr/sbin/dosfslabel:
+      /usr/sbin/fatlabel:
+      /usr/sbin/fsck.fat:
+      /usr/sbin/fsck.msdos:
+      /usr/sbin/fsck.vfat:
+      /usr/sbin/mkdosfs:
+      /usr/sbin/mkfs.fat:
+      /usr/sbin/mkfs.msdos:
+      /usr/sbin/mkfs.vfat:
+
+  copyright:
+    contents:
+      /usr/share/doc/dosfstools/copyright:

tests/spread/integration/dosfstools/task.yaml

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+summary: Integration tests for dosfstools
+
+execute: |
+  # Chisel a minimum number of slices to give us a runnable system that we can
+  # test in.
+  rootfs="$(install-slices dosfstools_bins)"
+  
+  # create a test image
+  dd if=/dev/zero of="${rootfs}/test.img" bs=1M count=250
+
+  # format the test image as fat
+  chroot "${rootfs}" mkfs.fat test.img
+
+  # check that the format was fine
+  chroot "${rootfs}" fsck.fat test.img | grep "0 files"
+
+  # change the label of the image
+  chroot "${rootfs}" fatlabel test.img "TESTIMG"
+
+  # verify it changed
+  chroot "${rootfs}" fatlabel test.img | grep "TESTIMG"
+
+  # cleanup
+  rm "${rootfs}/test.img"