templatevars: parse CLI opts with literal_eval

CHANGES.md

@@ -59,6 +59,11 @@ symlink to `DIR` (see #3884).
 
 ### Enhancements
 
+[#3974](https://github.com/cylc/cylc-flow/pull/3974) - Template variables,
+both in set files and provided via the -s/--set command line options are
+now parsed using ast.literal_eval. This permits non-string data types,
+strings must now be quoted.
+
 [#3811](https://github.com/cylc/cylc-flow/pull/3811) - Move from cycle based
 to `n` distance dependency graph window node generation and pruning of the
 data-store (API/visual backing data). Ability to modify distance of live

cylc/flow/network/schema.py

@@ -1486,7 +1486,7 @@ class Meta:
             running at reload time.
 
             If the suite was started with Jinja2 template variables set on the
-            command line (cylc run --set FOO=bar REG) the same template
+            command line (cylc run --set "FOO='bar'" REG) the same template
             settings apply to the reload (only changes to the flow.cylc
             file itself are reloaded).
 

cylc/flow/option_parsers.py

@@ -172,12 +172,16 @@ def add_std_options(self):
             self.add_std_option(
                 "-s", "--set", metavar="NAME=VALUE",
                 help=(
-                    "Set the value of a Jinja2 template variable in the "
-                    "suite definition. This option can be used multiple "
-                    "times on the command line. "
-                    "NOTE: these settings persist across suite restarts, "
-                    "but can be set again on the \"cylc restart\" "
-                    "command line if they need to be overridden."
+                    "Set the value of a Jinja2 template variable in the"
+                    " suite definition."
+                    " Values should be valid Python literals so strings"
+                    " must be quoted"
+                    " e.g. 'STR=\"string\"', INT=43, BOOL=True."
+                    " This option can be used multiple "
+                    " times on the command line."
+                    " NOTE: these settings persist across suite restarts,"
+                    " but can be set again on the \"cylc restart\""
+                    " command line if they need to be overridden."
                 ),
                 action="append", default=[], dest="templatevars")
 
@@ -187,6 +191,8 @@ def add_std_options(self):
                     "Set the value of Jinja2 template variables in the "
                     "suite definition from a file containing NAME=VALUE "
                     "pairs (one per line). "
+                    "As with --set values should be valid Python literals "
+                    "so strings must be quoted e.g. STR='string'. "
                     "NOTE: these settings persist across suite restarts, "
                     "but can be set again on the \"cylc restart\" "
                     "command line if they need to be overridden."

cylc/flow/scripts/reload.py

@@ -26,7 +26,7 @@
 already running at reload time.
 
 If the suite was started with Jinja2 template variables set on the command line
-(cylc run --set FOO=bar REG) the same template settings apply to the reload
+(cylc run --set 'FOO="bar"' REG) the same template settings apply to the reload
 (only changes to the flow.cylc file itself are reloaded).
 
 If the modified suite definition does not parse, failure to reload will

cylc/flow/templatevars.py

@@ -15,6 +15,42 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """Load custom variables for template processor."""
 
+from ast import literal_eval
+
+from cylc.flow.exceptions import UserInputError
+
+
+def eval_var(var):
+    """Wrap ast.literal_eval to provide more helpful error.
+
+    Examples:
+        >>> eval_var('42')
+        42
+        >>> eval_var('"string"')
+        'string'
+        >>> eval_var('string')
+        Traceback (most recent call last):
+        cylc.flow.exceptions.UserInputError: Invalid template variable: string
+        (note string values must be quoted)
+        >>> eval_var('[')
+        Traceback (most recent call last):
+        cylc.flow.exceptions.UserInputError: Invalid template variable: [
+        (values must be valid Python literals)
+
+    """
+    try:
+        return literal_eval(var)
+    except ValueError:
+        raise UserInputError(
+            f'Invalid template variable: {var}'
+            '\n(note string values must be quoted)'
+        ) from None
+    except SyntaxError:
+        raise UserInputError(
+            f'Invalid template variable: {var}'
+            '\n(values must be valid Python literals)'
+        ) from None
+
 
 def load_template_vars(template_vars=None, template_vars_file=None):
     """Load template variables from key=value strings."""
@@ -25,9 +61,9 @@ def load_template_vars(template_vars=None, template_vars_file=None):
             if not line:
                 continue
             key, val = line.split("=", 1)
-            res[key.strip()] = val.strip()
+            res[key.strip()] = eval_var(val.strip())
     if template_vars:
         for pair in template_vars:
             key, val = pair.split("=", 1)
-            res[key.strip()] = val.strip()
+            res[key.strip()] = eval_var(val.strip())
     return res

tests/flakyfunctional/cylc-show/00-simple.t

@@ -27,11 +27,11 @@ TEST_SHOW_OUTPUT_PATH="${PWD}/${TEST_NAME_BASE}-show"
 #-------------------------------------------------------------------------------
 TEST_NAME="${TEST_NAME_BASE}-validate"
 run_ok "${TEST_NAME}" cylc validate \
-    --set=TEST_OUTPUT_PATH="${TEST_SHOW_OUTPUT_PATH}" "${SUITE_NAME}"
+    --set="TEST_OUTPUT_PATH='${TEST_SHOW_OUTPUT_PATH}'" "${SUITE_NAME}"
 #-------------------------------------------------------------------------------
 TEST_NAME="${TEST_NAME_BASE}-run"
 suite_run_ok "${TEST_NAME}" cylc run --reference-test --debug --no-detach \
-    --set=TEST_OUTPUT_PATH="${TEST_SHOW_OUTPUT_PATH}" "${SUITE_NAME}"
+    --set="TEST_OUTPUT_PATH='${TEST_SHOW_OUTPUT_PATH}'" "${SUITE_NAME}"
 #-------------------------------------------------------------------------------
 TEST_NAME="${TEST_NAME_BASE}-show"
 cmp_ok "${TEST_NAME}-suite" <<'__SHOW_OUTPUT__'

tests/flakyfunctional/restart/19-checkpoint/flow.cylc

@@ -20,7 +20,7 @@ if [[ "${CYLC_TASK_CYCLE_POINT}" == '2017' ]]; then
     cylc__job__poll_grep_suite_log -F \
         '[t1.2017] status=submitted: (received)started'
     sleep 2  # make sure status change recorded in DB
-    cylc broadcast "${CYLC_SUITE_NAME}" -p '2017' -n 't1' --set='script=true'
+    cylc broadcast "${CYLC_SUITE_NAME}" -p '2017' -n 't1' --set='script="true"'
     cylc hold "${CYLC_SUITE_NAME}"
     cylc__job__poll_grep_suite_log -F \
         'INFO - Command succeeded: hold()'

tests/flakyfunctional/special/04-clock-triggered.t

@@ -23,37 +23,37 @@ set_test_number 4
 install_suite "${TEST_NAME_BASE}" "${TEST_NAME_BASE}"
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-validate" cylc validate "${SUITE_NAME}" \
-    -s "START=$(date '+%Y%m%dT%H')" \
-    -s "HOUR=$(date '+%H')" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(date '+%Y%m%dT%H')'" \
+    -s "HOUR='$(date '+%H')'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-run-now" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(date '+%Y%m%dT%H')" \
-    -s "HOUR=$(date '+%H')" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(date '+%Y%m%dT%H')'" \
+    -s "HOUR='$(date '+%H')'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 NOW="$(date '+%Y%m%dT%H')"
 run_ok "${TEST_NAME_BASE}-run-past" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='-10')" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT1M'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='-10')'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT1M"'
 #-------------------------------------------------------------------------------
 NOW="$(date '+%Y%m%dT%H')"
 run_fail "${TEST_NAME_BASE}-run-later" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='10')" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='10')'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 purge
 exit

tests/flakyfunctional/special/05-clock-triggered-utc.t

@@ -23,37 +23,37 @@ set_test_number 4
 install_suite "${TEST_NAME_BASE}" "${TEST_NAME_BASE}"
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-validate" cylc validate "${SUITE_NAME}" \
-    -s "START=$(date -u '+%Y%m%dT%H00')Z" \
-    -s "HOUR=$(date -u '+%H')" \
-    -s 'UTC_MODE=True' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(date -u '+%Y%m%dT%H00')Z'" \
+    -s "HOUR='$(date -u '+%H')'" \
+    -s 'UTC_MODE="True"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-run-now" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(date -u '+%Y%m%dT%H00')Z" \
-    -s "HOUR=$(date -u '+%H')" \
-    -s 'UTC_MODE=True' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT1M'
+    -s "START='$(date -u '+%Y%m%dT%H00')Z'" \
+    -s "HOUR='$(date -u '+%H')'" \
+    -s 'UTC_MODE="True"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT1M"'
 #-------------------------------------------------------------------------------
 NOW="$(date -u '+%Y%m%dT%H00')Z"
 run_ok "${TEST_NAME_BASE}-run-past" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='-10')" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)" \
-    -s 'UTC_MODE=True' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='-10')'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)'" \
+    -s 'UTC_MODE="True"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 NOW="$(date -u '+%Y%m%dT%H00')Z"
 run_fail "${TEST_NAME_BASE}-run-later" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='10')" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)" \
-    -s 'UTC_MODE=True' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='10')'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)'" \
+    -s 'UTC_MODE="True"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 purge
 exit

tests/flakyfunctional/special/06-clock-triggered-iso.t

@@ -23,38 +23,38 @@ set_test_number 4
 install_suite "${TEST_NAME_BASE}" "${TEST_NAME_BASE}"
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-validate" cylc validate "${SUITE_NAME}" \
-    -s "START=$(date '+%Y%m%dT%H%z')" \
-    -s "HOUR=$(date '+%H')" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(date '+%Y%m%dT%H%z')'" \
+    -s "HOUR='$(date '+%H')'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-run-now" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(date '+%Y%m%dT%H%z')" \
-    -s "HOUR=$(date '+%H')" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(date '+%Y%m%dT%H%z')'" \
+    -s "HOUR='$(date '+%H')'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 TZSTR="$(date '+%z')"
 NOW="$(date '+%Y%m%dT%H')"
 run_ok "${TEST_NAME_BASE}-run-past" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='-10')${TZSTR}" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT1M'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='-10')${TZSTR}'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT1M"'
 #-------------------------------------------------------------------------------
 NOW="$(date '+%Y%m%dT%H')"
 run_fail "${TEST_NAME_BASE}-run-later" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s "START=$(cylc cycle-point "${NOW}" --offset-hour='10')${TZSTR}" \
-    -s "HOUR=$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)" \
-    -s 'UTC_MODE=False' \
-    -s 'OFFSET=PT0S' \
-    -s 'TIMEOUT=PT12S'
+    -s "START='$(cylc cycle-point "${NOW}" --offset-hour='10')${TZSTR}'" \
+    -s "HOUR='$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)'" \
+    -s 'UTC_MODE="False"' \
+    -s 'OFFSET="PT0S"' \
+    -s 'TIMEOUT="PT12S"'
 #-------------------------------------------------------------------------------
 purge
 exit

tests/flakyfunctional/special/08-clock-triggered-0.t

@@ -24,27 +24,27 @@ set_test_number 4
 install_suite "${TEST_NAME_BASE}" "${TEST_NAME_BASE}"
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-validate" \
-    cylc validate "${SUITE_NAME}" -s START="$(date '+%Y%m%dT%H%z')" \
-    -s HOUR="$(date '+%H')" -s 'UTC_MODE=False' -s 'TIMEOUT=PT0.2M'
+    cylc validate "${SUITE_NAME}" -s "START='$(date '+%Y%m%dT%H%z')'" \
+    -s "HOUR='$(date '+%H')'" -s 'UTC_MODE="False"' -s 'TIMEOUT="PT0.2M"'
 #-------------------------------------------------------------------------------
 run_ok "${TEST_NAME_BASE}-run-now" \
     cylc run --debug --no-detach "${SUITE_NAME}" \
-    -s START="$(date '+%Y%m%dT%H%z')" \
-    -s HOUR="$(date '+%H')" -s 'UTC_MODE=False' -s 'TIMEOUT=PT0.2M'
+    -s "START='$(date '+%Y%m%dT%H%z')'" \
+    -s "HOUR='$(date '+%H')'" -s 'UTC_MODE="False"' -s 'TIMEOUT="PT0.2M"'
 #-------------------------------------------------------------------------------
 NOW="$(date '+%Y%m%dT%H')"
 START="$(cylc cycle-point "${NOW}" --offset-hour='-10')$(date '+%z')"
 HOUR="$(cylc cycle-point "${NOW}" --offset-hour='-10' --print-hour)"
 run_ok "${TEST_NAME_BASE}-run-past" \
-    cylc run --debug --no-detach "${SUITE_NAME}" -s START="${START}" \
-    -s HOUR="${HOUR}" -s 'UTC_MODE=False' -s 'TIMEOUT=PT1M'
+    cylc run --debug --no-detach "${SUITE_NAME}" -s "START='${START}'" \
+    -s "HOUR='${HOUR}'" -s 'UTC_MODE="False"' -s 'TIMEOUT="PT1M"'
 #-------------------------------------------------------------------------------
 NOW="$(date '+%Y%m%dT%H')"
 START="$(cylc cycle-point "${NOW}" --offset-hour='10')$(date '+%z')"
 HOUR="$(cylc cycle-point "${NOW}" --offset-hour='10' --print-hour)"
 run_fail "${TEST_NAME_BASE}-run-later" \
     cylc run --debug --no-detach "${SUITE_NAME}" -s START="${START}" \
-    -s HOUR="${HOUR}" -s 'UTC_MODE=False' -s 'TIMEOUT=PT0.2M'
+    -s "HOUR='${HOUR}'" -s 'UTC_MODE="False"' -s 'TIMEOUT="PT0.2M"'
 #-------------------------------------------------------------------------------
 purge
 exit

tests/flakyfunctional/xtriggers/00-wall_clock.t

@@ -19,7 +19,8 @@
 . "$(dirname "$0")/test_header"
 
 run_suite() {
-  cylc run --no-detach --debug "$1" -s "START=$2" -s "HOUR=$3" -s "OFFSET=$4"
+  cylc run --no-detach --debug "$1" \
+    -s "START='$2'" -s "HOUR='$3'" -s "OFFSET='$4'"
 }
 
 set_test_number 5
@@ -33,7 +34,7 @@ HOUR="$(date +%H)"
 OFFSET="PT0S"
 
 run_ok "${TEST_NAME_BASE}-val" cylc validate "${SUITE_NAME}" \
-   -s "START=${START}" -s "HOUR=${HOUR}" -s "OFFSET=${OFFSET}"
+   -s "START='${START}'" -s "HOUR='${HOUR}'" -s "OFFSET='${OFFSET}'"
 
 TEST_NAME="${TEST_NAME_BASE}-now"
 run_ok "${TEST_NAME}" run_suite "${SUITE_NAME}" "${START}" "${HOUR}" "${OFFSET}"

tests/flakyfunctional/xtriggers/01-suite_state.t

@@ -31,15 +31,15 @@ run_ok "${TEST_NAME_BASE}-val-up" cylc val --debug "${SUITE_NAME_UPSTREAM}"
 
 # Validate the downstream test suite.
 run_ok "${TEST_NAME_BASE}-val" \
-    cylc val --debug --set="UPSTREAM=${SUITE_NAME_UPSTREAM}" "${SUITE_NAME}"
+    cylc val --debug --set="UPSTREAM='${SUITE_NAME_UPSTREAM}'" "${SUITE_NAME}"
 
 # Run the upstream suite and detach (not a test).
 cylc run "${SUITE_NAME_UPSTREAM}"
 
 # Run the test suite - it should fail after inactivity ...
 TEST_NAME="${TEST_NAME_BASE}-run-fail"
 suite_run_fail "${TEST_NAME}" \
-   cylc run --set="UPSTREAM=${SUITE_NAME_UPSTREAM}" --no-detach "${SUITE_NAME}"
+   cylc run --set="UPSTREAM='${SUITE_NAME_UPSTREAM}'" --no-detach "${SUITE_NAME}"
 
 SUITE_LOG="$(cylc cat-log -m 'p' "${SUITE_NAME}")"
 grep_ok 'WARNING - suite timed out after inactivity for PT10S' "${SUITE_LOG}"