complete rewrite: use state explorer to determine current state, more robust implementation for adding, changing, removing key/values

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
This commit is contained in:
Steven Armstrong 2012-02-03 22:43:34 +01:00
parent 4628dad045
commit cad2097d05
6 changed files with 75 additions and 39 deletions

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@ -17,19 +17,34 @@
# You should have received a copy of the GNU General Public License # You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>. # along with cdist. If not, see <http://www.gnu.org/licenses/>.
# #
#
# Get the current value of key or __NOTSET__ if the key doesn't exist.
#
key="$(cat "$__object/parameter/key" 2>/dev/null \ key="$(cat "$__object/parameter/key" 2>/dev/null \
|| echo "$__object_id")" || echo "$__object_id")"
state="$(cat "$__object/parameter/state" 2>/dev/null \
|| echo "present")"
file="$(cat "$__object/parameter/file")" file="$(cat "$__object/parameter/file")"
delimiter="$(cat "$__object/parameter/delimiter")" delimiter="$(cat "$__object/parameter/delimiter")"
value="$(cat "$__object/parameter/value" 2>/dev/null \
|| echo "__CDIST_NOTSET__")"
awk -F "$delimiter" ' case "$state" in
BEGIN { found=0 } absent)
/^'$key'/ { print $2; found=1 } # if the key exists, with whatever value, we will have to remove it
END { if (found) exit 0; else exit 1 }' "$file" \ # so report it as present
|| echo "__NOTSET__" if egrep -q "^$key$delimiter+" "$file"; then
echo present
fi
;;
present)
if egrep -q "^$key$delimiter+$value$" "$file"; then
# key exists and value is same
echo present
elif egrep -q "^$key$delimiter+" "$file"; then
# key exists, but value is empty or different
echo wrongvalue
else
# key does not exist
echo absent
fi
;;
esac

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@ -18,32 +18,40 @@
# along with cdist. If not, see <http://www.gnu.org/licenses/>. # along with cdist. If not, see <http://www.gnu.org/licenses/>.
# #
value_is="$(cat "$__object/explorer/value")"
value_should="$(cat "$__object/parameter/value")"
key="$(cat "$__object/parameter/key")" key="$(cat "$__object/parameter/key")"
file="$(cat "$__object/parameter/file")" file="$(cat "$__object/parameter/file")"
delimiter="$(cat "$__object/parameter/delimiter")" delimiter="$(cat "$__object/parameter/delimiter")"
value="$(cat "$__object/parameter/value")"
if [ "$value_is" != "$value_should" ]; then state_is="$(cat "$__object/explorer/state")"
case "$value_is" in state_should="$(cat "$__object/parameter/state")"
__NOTSET__)
# add key and value if [ "$state_is" = "$state_should" ]; then
echo "echo \"${key}${delimiter}${value_should}\" >> \"$file\"" # nothing to do
exit 0
fi
case "$state_should" in
absent)
# remove lines starting with key
echo "sed -i '/^$key\($delimiter\+\)/d' \"$file\""
;;
present)
case "$state_is" in
absent)
# add new key and value
echo "echo \"${key}${delimiter}${value}\" >> \"$file\""
;;
wrongvalue)
# change exisiting value
echo "sed -i \"s|^$key\($delimiter\+\).*|$key\1$value|\" \"$file\""
;; ;;
*) *)
if [ "$value_should" = '__NOTSET__' ]; then echo "Unknown explorer state: $state_is" >&2
# remove key and value exit 1
cat << DONE esac
sed -i '/^${key}/d' "$file" ;;
DONE *)
else echo "Unknown state: $state_should" >&2
# change value exit 1
cat << DONE
sed -i "s|^$key\($delimiter\+\).*|$key\1$value_should|" "$file"
DONE
fi
;;
esac esac
fi

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@ -16,9 +16,6 @@ file.
REQUIRED PARAMETERS REQUIRED PARAMETERS
------------------- -------------------
value::
The value for the key. Setting the value to `__NOTSET__` will remove the key
from the file.
file:: file::
The file to operate on. The file to operate on.
delimiter:: delimiter::
@ -27,8 +24,13 @@ delimiter::
OPTIONAL PARAMETERS OPTIONAL PARAMETERS
------------------- -------------------
state::
present or absent, defaults to present. If present, sets the key to value,
if absent, removes the key from the file.
key:: key::
The key to change. Defaults to object_id. The key to change. Defaults to object_id.
value::
The value for the key. Optional if state=absent, required otherwise.
EXAMPLES EXAMPLES
@ -45,6 +47,9 @@ __key_value my-fancy-id --file /etc/login.defs --key SYS_UID_MAX --value 666 \
# Enable packet forwarding # Enable packet forwarding
__key_value net.ipv4.ip_forward --file /etc/sysctl.conf --value 1 \ __key_value net.ipv4.ip_forward --file /etc/sysctl.conf --value 1 \
--delimiter '=' --delimiter '='
# Remove existing key/value
__key_value LEGACY_KEY --file /etc/somefile --state absent --delimiter '='
-------------------------------------------------------------------------------- --------------------------------------------------------------------------------

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@ -19,5 +19,12 @@
# #
# set defaults # set defaults
[ -f "$__object/parameter/key" ] \ key="$(cat "$__object/parameter/key" 2>/dev/null \
|| echo "$__object_id" > "$__object/parameter/key" || echo "$__object_id" | tee "$__object/parameter/key")"
state="$(cat "$__object/parameter/state" 2>/dev/null \
|| echo "present" | tee "$__object/parameter/state")"
if [ "$state" = "present" -a ! -f "$__object/parameter/value" ]; then
echo "Missing required parameter 'value'" >&2
exit 1
fi

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@ -1 +1,3 @@
key key
value
state

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@ -1,3 +1,2 @@
value
file file
delimiter delimiter