Add custom remote copy/exec examples
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Darko Poljak
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1 changed files with 388 additions and 1 deletions
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@ -10,7 +10,7 @@ By default this is accomplished with ssh and scp respectively.
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The default implementations used by cdist are::
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__remote_exec: ssh -o User=root
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__remote_copy: scp -o User=root
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__remote_copy: scp -o User=root -q
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The user can override these defaults by providing custom implementations and
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passing them to cdist with the --remote-exec and/or --remote-copy arguments.
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@ -26,3 +26,390 @@ specified by enclosed in square brackets (see :strong:`ssh`\ (1) and
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With this simple interface the user can take total control of how cdist
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interacts with the target when required, while the default implementation
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remains as simple as possible.
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Examples
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--------
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Here are examples of using alternative __remote_copy and __remote_exec scripts.
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All scripts from below are present in cdist sources in `other/examples/remote`
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directory.
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ssh
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~~~
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Same as cdist default.
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**copy**
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Usage: cdist config --remote-copy "/path/to/this/script" target_host
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.. code-block:: sh
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#echo "$@" | logger -t "cdist-ssh-copy"
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scp -o User=root -q $@
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**exec**
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Usage: cdist config --remote-exec "/path/to/this/script" target_host
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.. code-block:: sh
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#echo "$@" | logger -t "cdist-ssh-exec"
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ssh -o User=root $@
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local
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~~~~~
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This effectively turns remote calling into local calling. Probably most useful
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for the unit testing.
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**copy**
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.. code-block:: sh
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code="$(echo "$@" | sed "s|\([[:space:]]\)$__target_host:|\1|g")"
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cp -L $code
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**exec**
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.. code-block:: sh
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target_host=$1; shift
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echo "$@" | /bin/sh
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chroot
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~~~~~~
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**copy**
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Usage: cdist config --remote-copy "/path/to/this/script /path/to/your/chroot" target-id
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.. code-block:: sh
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log() {
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#echo "$@" | logger -t "cdist-chroot-copy"
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:
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}
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chroot="$1"; shift
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target_host="$__target_host"
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# replace target_host with chroot location
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code="$(echo "$@" | sed "s|$target_host:|$chroot|g")"
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log "target_host: $target_host"
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log "chroot: $chroot"
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log "$@"
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log "$code"
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# copy files into chroot
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cp $code
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log "-----"
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**exec**
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Usage: cdist config --remote-exec "/path/to/this/script /path/to/your/chroot" target-id
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.. code-block:: sh
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log() {
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#echo "$@" | logger -t "cdist-chroot-exec"
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:
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}
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chroot="$1"; shift
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target_host="$1"; shift
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script=$(mktemp "${chroot}/tmp/chroot-${0##*/}.XXXXXXXXXX")
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trap cleanup INT TERM EXIT
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cleanup() {
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[ $__cdist_debug ] || rm "$script"
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}
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log "target_host: $target_host"
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log "script: $script"
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log "@: $@"
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echo "#!/bin/sh -l" > "$script"
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echo "$@" >> "$script"
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chmod +x "$script"
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relative_script="${script#$chroot}"
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log "relative_script: $relative_script"
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# run in chroot
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chroot "$chroot" "$relative_script"
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log "-----"
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rsync
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~~~~~
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**copy**
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Usage: cdist config --remote-copy /path/to/this/script target_host
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.. code-block:: sh
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# For rsync to do the right thing, the source has to end with "/" if it is
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# a directory. The below preprocessor loop takes care of that.
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# second last argument is the source
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source_index=$(($#-1))
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index=0
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for arg in $@; do
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if [ $index -eq 0 ]; then
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# reset $@
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set --
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fi
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index=$((index+=1))
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if [ $index -eq $source_index -a -d "$arg" ]; then
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arg="${arg%/}/"
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fi
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set -- "$@" "$arg"
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done
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rsync --backup --suffix=~cdist -e 'ssh -o User=root' $@
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schroot
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~~~~~~~
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__remote_copy and __remote_exec scripts to run cdist against a chroot on the
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target host over ssh.
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**copy**
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Usage: cdist config --remote-copy "/path/to/this/script schroot-chroot-name" target_host
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.. code-block:: sh
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log() {
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#echo "$@" | logger -t "cdist-schroot-copy"
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:
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}
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chroot_name="$1"; shift
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target_host="$__target_host"
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# get directory for given chroot_name
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chroot="$(ssh -o User=root -q $target_host schroot -c $chroot_name --config | awk -F = '/directory=/ {print $2}')"
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# prefix destination with chroot
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code="$(echo "$@" | sed "s|$target_host:|$target_host:$chroot|g")"
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log "target_host: $target_host"
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log "chroot_name: $chroot_name"
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log "chroot: $chroot"
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log "@: $@"
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log "code: $code"
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# copy files into remote chroot
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scp -o User=root -q $code
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log "-----"
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**exec**
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Usage: cdist config --remote-exec "/path/to/this/script schroot-chroot-name" target_host
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.. code-block:: sh
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log() {
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#echo "$@" | logger -t "cdist-schroot-exec"
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:
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}
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chroot_name="$1"; shift
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target_host="$1"; shift
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code="ssh -o User=root -q $target_host schroot -c $chroot_name -- $@"
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log "target_host: $target_host"
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log "chroot_name: $chroot_name"
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log "@: $@"
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log "code: $code"
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# run in remote chroot
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$code
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log "-----"
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schroot-uri
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~~~~~~~~~~~
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__remote_exec/__remote_copy script to run cdist against a schroot target URI.
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Usage::
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cdist config \
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--remote-exec "/path/to/this/script exec" \
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--remote-copy "/path/to/this/script copy" \
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target_uri
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# target_uri examples:
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schroot:///chroot-name
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schroot://foo.ethz.ch/chroot-name
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schroot://user-name@foo.ethz.ch/chroot-name
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# and how to match them in .../manifest/init
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case "$target_host" in
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schroot://*)
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# any schroot
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;;
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schroot://foo.ethz.ch/*)
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# any schroot on specific host
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;;
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schroot://foo.ethz.ch/chroot-name)
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# specific schroot on specific host
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;;
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schroot:///chroot-name)
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# specific schroot on localhost
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;;
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esac
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**copy/exec**
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.. code-block:: sh
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my_name="${0##*/}"
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mode="$1"; shift
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log() {
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# uncomment me for debugging
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#echo "$@" | logger -t "cdist-$my_name-$mode"
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:
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}
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die() {
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echo "$@" >&2
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exit 1
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}
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uri="$__target_host"
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scheme="${uri%%:*}"; rest="${uri#$scheme:}"; rest="${rest#//}"
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authority="${rest%%/*}"; rest="${rest#$authority}"
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path="${rest%\?*}"; rest="${rest#$path}"
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schroot_name="${path#/}"
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[ "$scheme" = "schroot" ] || die "Failed to parse scheme from __target_host ($__target_host). Expected 'schroot', got '$scheme'"
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[ -n "$schroot_name" ] || die "Failed to parse schroot name from __target_host: $__target_host"
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case "$authority" in
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'')
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# authority is empty, neither user nor host given
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user=""
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host=""
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;;
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*@*)
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# authority contains @, take user from authority
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user="${authority%@*}"
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host="${authority#*@}"
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;;
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*)
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# no user in authority, default to root
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user="root"
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host="$authority"
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;;
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esac
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log "mode: $mode"
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log "@: $@"
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log "uri: $uri"
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log "scheme: $scheme"
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log "authority: $authority"
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log "user: $user"
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log "host: $host"
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log "path: $path"
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log "schroot_name: $schroot_name"
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exec_prefix=""
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copy_prefix=""
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if [ -n "$host" ]; then
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# we are working on a remote host
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exec_prefix="ssh -o User=$user -q $host"
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copy_prefix="scp -o User=$user -q"
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copy_destination_prefix="$host:"
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else
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# working on local machine
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copy_prefix="cp"
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copy_destination_prefix=""
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fi
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log "exec_prefix: $exec_prefix"
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log "copy_prefix: $copy_prefix"
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log "copy_destination_prefix: $copy_destination_prefix"
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case "$mode" in
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exec)
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# In exec mode the first argument is the __target_host which we already got from env. Get rid of it.
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shift
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code="$exec_prefix schroot -c $schroot_name -- sh -c '$@'"
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;;
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copy)
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# get directory for given chroot_name
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schroot_directory="$($exec_prefix schroot -c $schroot_name --config | awk -F = '/directory=/ {print $2}')"
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[ -n "$schroot_directory" ] || die "Failed to retreive schroot directory for schroot: $schroot_name"
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log "schroot_directory: $schroot_directory"
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# prefix destination with chroot
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code="$copy_prefix $(echo "$@" | sed "s|$uri:|${copy_destination_prefix}${schroot_directory}|g")"
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;;
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*) die "Unknown mode: $mode";;
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esac
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log "code: $code"
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# Run the code
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$code
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log "-----"
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sudo
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~~~~
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**copy**
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Use rsync over ssh to copy files. Uses the "--rsync-path" option
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to run the remote rsync instance with sudo.
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This command assumes your ssh configuration is already set up in ~/.ssh/config.
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Usage: cdist config --remote-copy /path/to/this/script target_host
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.. code-block:: sh
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# For rsync to do the right thing, the source has to end with "/" if it is
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# a directory. The below preprocessor loop takes care of that.
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# second last argument is the source
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source_index=$(($#-1))
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index=0
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for arg in $@; do
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if [ $index -eq 0 ]; then
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# reset $@
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set --
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fi
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index=$((index+=1))
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if [ $index -eq $source_index -a -d "$arg" ]; then
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arg="${arg%/}/"
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fi
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set -- "$@" "$arg"
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done
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rsync --copy-links --rsync-path="sudo rsync" -e 'ssh' "$@"
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**exec**
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Prefixes all remote commands with sudo.
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This command assumes your ssh configuration is already set up in ~/.ssh/config.
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Usage: cdist config --remote-exec "/path/to/this/script" target_host
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.. code-block:: sh
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host="$1"; shift
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ssh -q "$host" sudo sh -c \""$@"\"
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