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|
#!/bin/sh
set -e
STATE="$1"
FILES="$2"
tmp_backup_dir="$FILES"/tmp/backup
dest_dir_file="$FILES"/files/dest_dir
filename_file="$FILES"/files/filename
permissions_file="$FILES"/files/permissions
safe_copy() {
if [ $# -gt 2 ]; then
echo "safe_copy can only handle one file copy at a time" >&2
exit 2
fi
cp -a "$1" "$2".tmp || return $?
sync "$2".tmp || return $?
mv "$2".tmp "$2" || return $?
sync "$(dirname "$2")" || return $?
}
case "$STATE" in
NeedsArtifactReboot)
echo "No"
;;
SupportsRollback)
echo "Yes"
;;
ArtifactInstall)
dest_dir=$(cat "${dest_dir_file}")
filename=$(cat "${filename_file}")
test -z "$dest_dir" -o -z "$filename" && \
echo "Fatal error: dest_dir or filename are undefined." >&2 && exit 1
mkdir -p "${dest_dir}"
mkdir -p "${tmp_backup_dir}"
if test -f "${dest_dir}/${filename}"
then
if ! safe_copy "${dest_dir}/${filename}" "${tmp_backup_dir}/${filename}"
then
ret=$?
# Make sure there is no half-backup lying around.
rm -rf "${tmp_backup_dir}"
exit $ret
fi
fi
# Previous revisions of this update module did not use the
# permissions_file, so it might not exist.
if test -f "${permissions_file}"
then
mode=$(cat "${permissions_file}")
chmod "${mode}" "$FILES"/files/"${filename}"
fi
safe_copy "$FILES"/files/"${filename}" "${dest_dir}/${filename}"
;;
ArtifactRollback)
filename=$(cat "${filename_file}")
test -f "${tmp_backup_dir}/${filename}" || exit 0
dest_dir=$(cat "${dest_dir_file}")
test -z "$dest_dir" -o -z "$filename" && \
echo "Fatal error: dest_dir or filename are undefined." && exit 1
safe_copy "${tmp_backup_dir}/${filename}" "${dest_dir}/${filename}"
;;
esac
exit 0
|
