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Package Updates + Protect against downgrade of packages (#388)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| #!/bin/bash | ||
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| ### | ||
| # semantic version comparition using semver specification http://semver.org/ | ||
| # This bash script compares pre-releases alphabetically as well | ||
| # | ||
| # Copied from https://gist.githubusercontent.com/Ariel-Rodriguez/9e3c2163f4644d7a389759b224bfe7f3/raw/816453441da56058b73af5812db6217fb71897d2/semver.sh | ||
| # | ||
| # | ||
| # returns 1 when A greater than B | ||
| # returns 0 when A equals B | ||
| # returns -1 when A lower than B | ||
| # | ||
| # Usage | ||
| # chmod +x semver.sh | ||
| # ./semver.sh 1.0.0 v1.0.0-rc.0 | ||
| # --> 1 | ||
| # | ||
| # Author Ariel Rodriguez | ||
| # License MIT | ||
| ### | ||
| semver_compare() { | ||
| local version_a version_b pr_a pr_b | ||
| # strip word "v" and extract first subset version (x.y.z from x.y.z-foo.n) | ||
| version_a=$(echo "${1//v/}" | awk -F'-' '{print $1}') | ||
| version_b=$(echo "${2//v/}" | awk -F'-' '{print $1}') | ||
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| if [ "$version_a" \= "$version_b" ] | ||
| then | ||
| # check for pre-release | ||
| # extract pre-release (-foo.n from x.y.z-foo.n) | ||
| pr_a=$(echo "$1" | awk -F'-' '{print $2}') | ||
| pr_b=$(echo "$2" | awk -F'-' '{print $2}') | ||
|
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||
| #### | ||
| # Return 0 when A is equal to B | ||
| [ "$pr_a" \= "$pr_b" ] && echo 0 && return 0 | ||
|
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| #### | ||
| # Return 1 | ||
|
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| # Case when A is not pre-release | ||
| if [ -z "$pr_a" ] | ||
| then | ||
| echo 1 && return 0 | ||
| fi | ||
|
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| #### | ||
| # Case when pre-release A exists and is greater than B's pre-release | ||
|
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| # extract numbers -rc.x --> x | ||
| number_a=$(echo ${pr_a//[!0-9]/}) | ||
| number_b=$(echo ${pr_b//[!0-9]/}) | ||
| [ -z "${number_a}" ] && number_a=0 | ||
| [ -z "${number_b}" ] && number_b=0 | ||
|
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| [ "$pr_a" \> "$pr_b" ] && [ -n "$pr_b" ] && [ "$number_a" -gt "$number_b" ] && echo 1 && return 0 | ||
|
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| #### | ||
| # Retrun -1 when A is lower than B | ||
| echo -1 && return 0 | ||
| fi | ||
| arr_version_a=(${version_a//./ }) | ||
| arr_version_b=(${version_b//./ }) | ||
| cursor=0 | ||
| # Iterate arrays from left to right and find the first difference | ||
| while [ "$([ "${arr_version_a[$cursor]}" -eq "${arr_version_b[$cursor]}" ] && [ $cursor -lt ${#arr_version_a[@]} ] && echo true)" == true ] | ||
| do | ||
| cursor=$((cursor+1)) | ||
| done | ||
| [ "${arr_version_a[$cursor]}" -gt "${arr_version_b[$cursor]}" ] && echo 1 || echo -1 | ||
| } | ||
|
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| [ -n "$1" ] && echo $(semver_compare $1 $2) |
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