Esthri (S3)

非常简单的（内存稳定）S3客户端，支持get、put、head、list和sync操作。

esthri 6.3.0
Simple S3 file transfer utility.

USAGE:
    esthri <SUBCOMMAND>

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

SUBCOMMANDS:
    abort           Manually abort a multipart upload
    etag            Compute and print the S3 ETag of the file
    get             Download an object from S3
    head-object     Retreive the ETag for a remote object
    help            Prints this message or the help of the given subcommand(s)
    list-objects    List remote objects in S3
    put             Upload an object to S3
    serve           Launch an HTTP server attached to the specified bucket
    sync            Sync a directory with S3

AWS S3兼容层

esthri CLI工具还提供了一个AWS CLI兼容模式，其中它可以处理与aws s3工具相同的CLI界面的cp和sync操作。目前，这些命令只实现了基本案例，并且只处理了一些可选参数。

要使用，esthri二进制文件必须被

• 命名为或硬链接为aws
• 通过设置ESTHRI_AWS_COMPAT_MODE环境变量来运行

在此模式下，esthri将尝试透明地调用实际的aws工具，如果遇到它无法处理的命令。为此，应将实际aws工具的路径放入名为ESTHRI_AWS_PATH的环境变量中。例如：ETHRI_AWS_PATH=/usr/bin/aws。如果未指定此环境变量，则esthri将默认调用aws.real作为aws工具。

$ ln -s /usr/local/bin/aws /usr/local/bin/aws.real
$ ESTHRI_AWS_COMPAT_MODE=1 esthri s3 help # prints the S3 help text, as generated by the aws command

透明同步压缩

esthri可以透明地压缩文件，使得它们在S3中压缩，但在本地文件系统中不压缩。要启用，可以设置ESTHRI_AWS_COMPAT_MODE_COMPRESSION环境变量或使用--transparent-compression CLI选项。例如

ESTHRI_AWS_COMPAT_MODE=1 esthri s3 sync mydirectory/ s3://esthri-test/myfiles/ --transparent-compression # syncs as normal, however files in S3 are gzipped
ESTHRI_AWS_COMPAT_MODE=1 esthri s3 sync s3://esthri-test/myfiles/ mynewdirectory/ --transparent-compression # syncs and decompresses files as they are synced down. mydirectory and mynewdirectory will now contain the same files

esthri使用S3元数据来完成此透明压缩，将压缩文件的esthri版本号存储在已压缩文件的元数据中。因此，解压缩将仅适用于esthri自己压缩的文件。

AWS凭证提供者选择

强烈建议设置一个特定的凭证提供者，它可以提供更好的安全性和细粒度控制。例如：

CREDENTIAL_PROVIDER=profile esthri s3 sync s3://esthri-test/myfiles/ mynewdirectory/

ESTHRI_CREDENTIAL_PROVIDER=env ——> 从环境变量中获取 ESTHRI_CREDENTIAL_PROVIDER=profile ——> 从默认凭证文件中获取 ESTHRI_CREDENTIAL_PROVIDER=container ——> 从ECS任务中的IAM角色中获取 ESTHRI_CREDENTIAL_PROVIDER=instance_metadata ——> 从实例元数据服务中获取 ESTHRI_CREDENTIAL_PROVIDER=k8s ——> 从kubernetes身份验证服务中获取 ESTHRI_CREDENTIAL_PROVIDER ——> 如果为空，则显式使用默认凭证提供者

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