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[enh] Create ynh_backup helper based on ynh_bind_or_cp

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This commit is contained in:
Jérôme Lebleu 2016-05-06 20:26:14 +02:00
parent 26aa1cba37
commit be9d744f3c
1 changed files with 42 additions and 17 deletions
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59
data/helpers.d/filesystem
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@ -1,27 +1,43 @@
CAN_BIND=${CAN_BIND:-1}
# Bind a directory or copy it on error
# Mark a file or a directory for backup
# Note: currently, SRCPATH will be copied or binded to DESTPATH
#
# usage: ynh_bind_or_cp srcdir destdir as_root
# usage: ynh_backup srcdir destdir can_bind as_root
# | arg: srcdir - directory to bind or copy
# | arg: destdir - mountpoint or destination directory
# | arg: as_root - 1 to execute commands as root
ynh_bind_or_cp() {
local SRCDIR=$1
local DESTDIR=$2
local SUDO_CMD=
[[ "${3}" = "1" ]] && SUDO_CMD="sudo"
# | arg: to_bind - 1 to bind mounting the directory if possible
# | arg: no_root - 1 to execute commands as current user
ynh_backup() {
local SRCPATH=$1
local DESTPATH=$2
local TO_BIND=${3:-0}
local SUDO_CMD="sudo"
[[ "${4:-}" = "1" ]] && SUDO_CMD=
[[ ! -f "${DESTDIR}" ]] || {
echo "Destination directory '${DESTDIR}' already exists" >&2
# validate arguments
[[ -e "${SRCPATH}" ]] || {
echo "Source path '${DESTPATH}' does not exist" >&2
return 1
}
[[ "${DESTPATH:0:1}" = "/" ]] && {
echo "Destination path should be relative" >&2
return 1
}
# prepend the backup directory
[[ -z "${YNH_APP_BACKUP_DIR}" ]] || \
DESTPATH="${YNH_APP_BACKUP_DIR}/${DESTPATH}"
[[ ! -e "${DESTPATH}" ]] || {
echo "Destination path '${DESTPATH}' already exist" >&2
return 1
}
# attempt to bind mounting the directory
if [[ "${CAN_BIND}" = "1" ]]; then
eval $SUDO_CMD mkdir -p "${DESTDIR}"
if [[ "${CAN_BIND}" = "1" && "${TO_BIND}" = "1" ]]; then
eval $SUDO_CMD mkdir -p "${DESTPATH}"
if sudo mount --rbind "${SRCDIR}" "${DESTDIR}"; then
if sudo mount --rbind "${SRCPATH}" "${DESTPATH}"; then
return 0
else
CAN_BIND=0
@ -30,13 +46,22 @@ ynh_bind_or_cp() {
fi
# delete mountpoint directory safely
mountpoint -q "${DESTDIR}" && sudo umount -R "${DESTDIR}"
eval $SUDO_CMD rm -rf "${DESTDIR}"
mountpoint -q "${DESTPATH}" && sudo umount -R "${DESTPATH}"
eval $SUDO_CMD rm -rf "${DESTPATH}"
fi
# ... or just copy the directory
eval $SUDO_CMD mkdir -p $(dirname "${DESTDIR}")
eval $SUDO_CMD cp -a "${SRCDIR}" "${DESTDIR}"
eval $SUDO_CMD mkdir -p $(dirname "${DESTPATH}")
eval $SUDO_CMD cp -a "${SRCPATH}" "${DESTPATH}"
}
# Deprecated helper since it's a dangerous one!
ynh_bind_or_cp() {
local AS_ROOT=${3:-0}
local NO_ROOT=0
[[ "${AS_ROOT}" = "1" ]] || NO_ROOT=1
echo "This helper is deprecated, you should use ynh_backup instead" >&2
ynh_backup "$1" "$2" 1 "$NO_ROOT"
}
# Create a directory under /tmp