jq 用字符串作为 json 对象中的字符串前缀

Question

我希望为 Redshift 生成一个清单文件，其中COPY包含aws s3api --list-objects和jq，如下所示：-

aws s3api list-objects --bucket annalects3 --prefix "DFA/20160926/394007-OMD-Coles/dcm_account394007_impression" --output json --query '{"entries": Contents[].{"url":"Key"}}' | jq '.entries[].mandatory = true'

它生成如下输出：-

    {   "entries": [
        {
          "mandatory": true,
          "url": "DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092507_20160926_002328_292527438.csv.gz"
        },
        {
          "mandatory": true,
          "url": "DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092508_20160926_020131_292592736.csv.gz"
        },
        {
          "mandatory": true,
          "url": "DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092509_20160926_030312_292502379.csv.gz"
        },
        {
          "mandatory": true,
          "url": "DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092510_20160926_033656_292590227.csv.gz"
        }   
  ] 
}

但是，清单文件需要以存储桶名称为前缀的 URL 对象，但我没有使用过。输出需要看起来像

{   "entries": [
        {
          "mandatory": true,
          "url": "s3://mybucket/DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092507_20160926_002328_292527438.csv.gz"
        },
        {
          "mandatory": true,
          "url": "s3://mybucket/DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092508_20160926_020131_292592736.csv.gz"
        },
        {
          "mandatory": true,
          "url": "s3://mybucket/DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092509_20160926_030312_292502379.csv.gz"
        },
        {
          "mandatory": true,
          "url": "s3://mybucket/DFA/20160926/394007-OMD-Coles/dcm_account394007_impression_2016092510_20160926_033656_292590227.csv.gz"
        }   
  ] 
}

Answer 1

以下将实现您想要的

aws s3api list-objects \
    --bucket <mybucket> \
    --prefix "<myprefix>" \
    --output json \
    --query '{"entries": Contents[].{"url":"Key"}}' \
| jq '.entries[] | .url = "s3://<mybucket>/\(.entries.url)" | .mandatory = true'

我正在使用字符串插值来更新entries[].url值