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22 lines
991 B
22 lines
991 B
set -e
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# retrieve current file version
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# e.g. curl -R -I $1
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check_version() {
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# retrieves HTTP header of file URL response
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local httpHeader=$(curl -LR -I $1 2>&1 | grep 'Last-Modified:')
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# Checks if field "Last-Modified" exists in HTTP header and transform it into timestamp string
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# if that field is not present, return current timestamp
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local dateVersionFormat="%Y%m%d%H%S"
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local dateString=$(date +"$dateVersionFormat")
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if [ ! -z "$httpHeader" ]
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then
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# echo "Last-Modified information returned for targeted file. Extract date, removing day of the week string
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local tmpDateString=$(echo "$httpHeader" | sed -e "s/Last-Modified: //" | cut -d',' -f 2)
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# rfc1123Format="%d\ %b\ %Y\ %H:%M:%S\ GMT" - in order to work in boot2docker, it has to be outside of quotes in the command below
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local dateString=$(date +"$dateVersionFormat" -D %d\ %b\ %Y\ %H:%M:%S\ GMT -d "$tmpDateString")
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fi
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echo "{\"version\":\"$dateString\"}" | jq --slurp .
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}
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