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htslib-s3-plugin(7) Bioinformatics tools htslib-s3-plugin(7) NAME htslib-s3-plugin - htslib AWS S3 plugin DESCRIPTION The S3 plugin allows htslib file functions to communicate with servers that use the AWS S3 protocol. Files are identified by their bucket and object key in a URL format e.g. s3://mybucket/path/to/file With path/to/file being the object key. Necessary security information can be provided in as part of the URL, in environment variables or from configuration files. The full URL format is: s3[+SCHEME]://[ID[:SECRET[:TOKEN]]@]BUCKET/PATH The elements are: SCHEME The protocol used. Defaults to https. ID The user AWS access key. SECRET The secret key for use with the access key. TOKEN Token used for temporary security credentials. BUCKET AWS S3 bucket. PATH Path to the object under the bucket. The environment variables below will be used if the user ID is not set. AWS_ACCESS_KEY_ID The user AWS access key. AWS_SECRET_ACCESS_KEY The secret key for use with the access key. AWS_DEFAULT_REGION The region to use. Defaults to us-east-1. AWS_SESSION_TOKEN Token used for temporary security credentials. AWS_DEFAULT_PROFILE The profile to use in credentials, config or s3cfg files. Defaults to default. AWS_PROFILE Same as above. AWS_SHARED_CREDENTIALS_FILE Location of the credentials file. Defaults to ~/.aws/credentials. HTS_S3_S3CFG Location of the s3cfg file. Defaults to ~/.s3cfg. HTS_S3_HOST Sets the host. Defaults to s3.amazonaws.com. HTS_S3_V2 If set use signature v2 rather the default v4. This will limit the plugin to reading only. HTS_S3_PART_SIZE Sets the upload part size in Mb, the minimum being 5Mb. By default the part size starts at 5Mb and expands at regular intervals to ac- commodate bigger files (up to 2.5 Tbytes with the current rate). Using this setting disables the automatic part size expansion. HTS_S3_ADDRESS_STYLE Sets the URL style. Options are auto (default), virtual or path. In the absence of an ID from the previous two methods the credential/config files will be used. The default file locations are either ~/.aws/creden- tials or ~/.s3cfg (in that order). Entries used in aws style credentials file are aws_access_key_id, aws_se- cret_access_key, aws_session_token, region, addressing_style and ex- piry_time (unofficial, see SHORT-LIVED CREDENTIALS below). Only the first two are usually needed. Entries used in s3cmd style config files are access_key, secret_key, ac- cess_token, host_base, bucket_location and host_bucket. Again only the first two are usually needed. The host_bucket option is only used to set a path-style URL, see below. SHORT-LIVED CREDENTIALS Some cloud identity and access management (IAM) systems can make short- lived credentials that allow access to resources. These credentials will expire after a time and need to be renewed to give continued access. To enable this, the S3 plugin allows an expiry_time entry to be set in the .aws/credentials file. The value for this entry should be the time when the token expires, following the format in RFC3339 section 5.6, which takes the form: 2012-04-29T05:20:48Z That is, year - month - day, the letter "T", hour : minute : second. The time can be followed by the letter "Z", indicating the UTC timezone, or an offset from UTC which is a "+" or "-" sign followed by two digits for the hours offset, ":", and two digits for the minutes. The S3 plugin will attempt to re-read the credentials file up to 1 minute before the given expiry time, which means the file needs to be updated with new credentials before then. As the exact way of doing this can vary be- tween services and IAM providers, the S3 plugin expects this to be done by an external user-supplied process. This may be achieved by running a pro- gram that replaces the file as new credentials become available. The fol- lowing script shows how it might be done for AWS instance credentials: #!/bin/sh instance='http://169.254.169.254' tok_url="$instance/latest/api/token" ttl_hdr='X-aws-ec2-metadata-token-ttl-seconds: 10' creds_url="$instance/latest/meta-data/iam/security-credentials" key1='aws_access_key_id = \(.AccessKeyId)\n' key2='aws_secret_access_key = \(.SecretAccessKey)\n' key3='aws_session_token = \(.Token)\n' key4='expiry_time = \(.Expiration)\n' while true; do token=`curl -X PUT -H "$ttl_hdr" "$tok_url"` tok_hdr="X-aws-ec2-metadata-token: $token" role=`curl -H "$tok_hdr" "$creds_url/"` expires='now' ( curl -H "$tok_hdr" "$creds_url/$role" \ | jq -r "\"${key1}${key2}${key3}${key4}\"" > credentials.new ) \ && mv -f credentials.new credentials \ && expires=`grep expiry_time credentials | cut -d ' ' -f 3-` if test $? -ne 0 ; then break ; fi expiry=`date -d "$expires - 3 minutes" '+%s'` now=`date '+%s'` test "$expiry" -gt "$now" && sleep $((($expiry - $now) / 2)) sleep 30 done Note that the expiry_time key is currently only supported for the .aws/cre- dentials file (or the file referred to in the AWS_SHARED_CREDENTIALS_FILE environment variable). NOTES In most cases this plugin transforms the given URL into a virtual host- style format e.g. https://bucket.host/path/to/file. A path-style format is used where the URL is not DNS compliant or the bucket name contains a dot e.g. https://host/bu.cket/path/to/file. Path-style can be forced by setting one either HTS_S3_ADDRESS_STYLE, ad- dressing_style or host_bucket. The first two can be set to path while host_bucket must not include the %(bucket).s string. SEE ALSO htsfile(1) samtools(1) RFC 3339: <https://www.rfc-editor.org/rfc/rfc3339#section-5.6> htslib website: <http://www.htslib.org/> htslib-1.23.1 18 March 2026 htslib-s3-plugin(7)
NAME | DESCRIPTION | SHORT-LIVED CREDENTIALS | NOTES | SEE ALSO
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