[Buildroot] [PATCH] download: Add SFTP support (not FTPS)

Carlos Santos unixmania at gmail.com
Sat Oct 5 03:02:25 UTC 2019


On Thu, Oct 3, 2019 at 11:53 AM Thomas Preston
<thomas.preston at codethink.co.uk> wrote:
>
> Add secure file transfer program (sftp) support using a simple wrapper.
> SFTP is similar to FTP but it preforms all operations over an encrypted
> SSH transport.
>
> Signed-off-by: Thomas Preston <thomas.preston at codethink.co.uk>
> Signed-off-by: Michael Drake <michael.drake at codethink.co.uk>
> ---
>  Config.in                   |  4 ++++
>  package/pkg-download.mk     |  1 +
>  support/download/dl-wrapper |  2 +-
>  support/download/sftp       | 37 +++++++++++++++++++++++++++++++++++++
>  4 files changed, 43 insertions(+), 1 deletion(-)
>  create mode 100755 support/download/sftp
>
> diff --git a/Config.in b/Config.in
> index 757ad1ca40..313af45a0c 100644
> --- a/Config.in
> +++ b/Config.in
> @@ -136,6 +136,10 @@ config BR2_SCP
>         string "Secure copy (scp) command"
>         default "scp"
>
> +config BR2_SFTP
> +       string "Secure file transfer (sftp) command"
> +       default "sftp"
> +
>  config BR2_HG
>         string "Mercurial (hg) command"
>         default "hg"
> diff --git a/package/pkg-download.mk b/package/pkg-download.mk
> index de619ba90a..88790fe46e 100644
> --- a/package/pkg-download.mk
> +++ b/package/pkg-download.mk
> @@ -15,6 +15,7 @@ export BZR := $(call qstrip,$(BR2_BZR))
>  export GIT := $(call qstrip,$(BR2_GIT))
>  export HG := $(call qstrip,$(BR2_HG))
>  export SCP := $(call qstrip,$(BR2_SCP))
> +export SFTP := $(call qstrip,$(BR2_SFTP))
>  export LOCALFILES := $(call qstrip,$(BR2_LOCALFILES))
>
>  DL_WRAPPER = support/download/dl-wrapper
> diff --git a/support/download/dl-wrapper b/support/download/dl-wrapper
> index 3315bd410e..6cf0b89cba 100755
> --- a/support/download/dl-wrapper
> +++ b/support/download/dl-wrapper
> @@ -88,7 +88,7 @@ main() {
>          backend_urlencode="${uri%%+*}"
>          backend="${backend_urlencode%|*}"
>          case "${backend}" in
> -            git|svn|cvs|bzr|file|scp|hg) ;;
> +            git|svn|cvs|bzr|file|scp|hg|sftp) ;;
>              *) backend="wget" ;;
>          esac
>          uri=${uri#*+}
> diff --git a/support/download/sftp b/support/download/sftp
> new file mode 100755
> index 0000000000..8aeb91e0e8
> --- /dev/null
> +++ b/support/download/sftp
> @@ -0,0 +1,37 @@
> +#!/usr/bin/env bash
> +
> +# We want to catch any unexpected failure, and exit immediately
> +set -e
> +
> +# Download helper for sftp, to be called from the download wrapper script
> +#
> +# Options:
> +#   -q          Be quiet.
> +#   -o FILE     Copy to local file FILE.
> +#   -f FILE     Copy from remote file FILE.
> +#   -u URI      Download file at URI.
> +#
> +# Environment:
> +#   SFTP      : the sftp command to call
> +
> +verbose=
> +while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
> +    case "${OPT}" in
> +    q)  verbose=-q;;
> +    o)  output="${OPTARG}";;
> +    f)  filename="${OPTARG}";;
> +    u)  uri="${OPTARG}";;
> +    :)  printf "option '%s' expects a mandatory argument\n" "${OPTARG}"; exit 1;;
> +    \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
> +    esac
> +done
> +
> +shift $((OPTIND-1)) # Get rid of our options
> +
> +# Caller needs to single-quote its arguments to prevent them from
> +# being expanded a second time (in case there are spaces in them)
> +_sftp() {
> +    eval ${SFTP} "${@}"
> +}
> +
> +_sftp ${verbose} "${@}" "'${uri}/${filename}'" "'${output}'"
> --
> 2.20.1
>
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> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

You intend to add packages that require this feature, I suppose.

-- 
Carlos Santos <unixmania at gmail.com>



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