add basic Charliecloud commands

https://github.com/hpc/charliecloud

sheets/ch-build

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+# ch-build
+# Utility to build a Charliecloud image and place it in the builder’s back-end storage. More information: <https://github.com/hpc/charliecloud>.
+
+# Create an image tagged foo and specified by the file /bar/Dockerfile. Use /bar as the Docker context directory. Use the default builder.
+ch-build -t foo --file=/bar/Dockerfile /bar
+

sheets/ch-build2dir

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+# ch-build2dir
+# Utility to build a Charliecloud image from Dockerfile and unpack it into a directory. More information: <https://github.com/hpc/charliecloud>.
+
+# Build a Charliecloud image using ./Dockerfile.foo and create image directory /var/tmp/foo
+ch-build2dir -t foo -f ./Dockerfile.foo . /var/tmp
+

sheets/ch-builder2squash

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+# ch-builder2squash
+# Utility to flatten a builder image into a Charliecloud SquashFS file. More information: <https://github.com/hpc/charliecloud>.
+
+# Flattens the builder image tagged "debian" into a SquashFS file named debian.sqfs in /var/tmp.
+ch-builder2squash debian /var/tmp
+

sheets/ch-builder2tar

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+# ch-builder2tar
+# Utility to flatten a builder image into a Charliecloud image tarball. More information: <https://github.com/hpc/charliecloud>.
+
+# Flatten the builder image tagged "hello" into a Charliecloud tarball in directory /var/tmp
+ch-builder2tar hello /var/tmp
+

sheets/ch-dir2squash

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+# ch-dir2squash
+# Utility to create a SquashFS file from a Charliecloud image directory. More information: <https://github.com/hpc/charliecloud>.
+
+# Create a Charliecloud SquashFS file debian.sqfs from the image directory /var/tmp/debian under the directory /var/tmp.
+ch-dir2squash /var/tmp/debian /var/tmp
+

sheets/ch-grow

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+# ch-grow
+# Utility to build and manage Charliecloud images but not running them. It is completely unprivileged, with no setuid/setgid/setcap helpers. More information: <https://github.com/hpc/charliecloud>.
+
+# Build the image "bar" using ./foo/bar/Dockerfile and context directory ./foo/bar
+ch-grow build -t bar -f ./foo/bar/Dockerfile ./foo/bar
+
+# Download the Debian Buster image and place it in /tmp/buster.
+ch-grow pull debian:buster /tmp/buster
+

sheets/ch-mount

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+# ch-mount
+# Utility to mount a SquashFS image file using FUSE. More information: <https://github.com/hpc/charliecloud>.
+
+
+# Create a new empty directory named debian, then mount it on /var/tmp directory. The /var/tmp directory must not already exist.
+ch-mount /var/tmp/debian.sqfs /var/tmp
+

sheets/ch-pull2dir

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+# ch-pull2dir
+# Utility to pull an image from the Docker Hub and unpack it into a directory. More information: <https://github.com/hpc/charliecloud>.
+
+# Pull Docker image named alpine:latest from Docker Hub and extract it into a subdirectory of /var/tmp. A temporary tarball will be stored in /var/tmp.
+ch-pull2dir alpine:latest /var/tmp
+

sheets/ch-pull2tar

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+# ch-pull2tar
+# Utility to pull an image from the Docker Hub and flatten it into a tarball. More information: <https://github.com/hpc/charliecloud>.
+
+
+# Pull a Docker image named alpine:latest from Docker Hub and flatten it into a Charliecloud tarball in the directory /var/tmp.
+ch-pull2tar alpine:latest /var/tmp
+

sheets/ch-run

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+# ch-run
+# Utility to run a command in a Charliecloud container. More information: <https://github.com/hpc/charliecloud>.
+
+# Run the command echo hello inside a Charliecloud container using the unpacked image at /data/foo.
+ch-run /data/foo -- echo hello
+

sheets/ch-tar2dir

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+# ch-tar2dir
+# Utility to unpack a Charliecloud image tarball into a directory. More information: <https://github.com/hpc/charliecloud>.
+
+# Extract the tarball /var/tmp/hello.tar.gz into a subdirectory of /var/tmp. hello.tar.gz must contain a Linux filesystem image, e.g. as created by ch-builder2tar.
+ch-tar2dir /var/tmp/hello.tar.gz /var/tmp
+