57 lines
1.3 KiB
Bash
57 lines
1.3 KiB
Bash
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#!/bin/bash
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# Directory that holds the cached packages.
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cache_dir=$1
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# Version of the cache to create or load.
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version=$2
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# List of the packages to use.
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packages=${@:3}
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echo -n "Validating action arguments (version='$version', packages='$packages')...";
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echo $version | grep -o " " > /dev/null
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if [ $? -eq 0 ]; then
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echo "aborted."
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echo "Version value '$version' cannot contain spaces." >&2
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exit 1
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fi
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if [ "$packages" == "" ]; then
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echo "aborted."
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echo "Packages argument cannot be empty." >&2
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exit 2
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fi
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echo "done."
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echo -n "Verifying packages..."
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for package in $packages; do
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apt-cache search ^$package$ | grep $package > /dev/null
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if [ $? -ne 0 ]; then
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echo "aborted."
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echo "Package '$package' not found." >&2
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exit 3
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fi
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done
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echo "done."
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# Abort on any failure at this point.
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set -e
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echo "Creating cache key..."
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# Remove package delimiters, sort (requires newline) and then convert back to inline list.
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normalized_list=$(echo $packages | sed 's/[\s,]+/ /g' | tr ' ' '\n' | sort | tr '\n' ' ')
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echo "- Normalized package list is '$normalized_list'."
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value=$(echo $normalized_list @ $version)
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echo "- Value to hash is '$value'."
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key=$(echo $value | md5sum | /bin/cut -f1 -d' ')
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echo "- Value hashed as '$key'."
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echo "done."
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key_filepath="$cache_dir/cache_key.md5"
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echo $key > $key_filepath
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echo "Hash value written to $key_filepath"
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