1*98875883SSimon J. Gerraty# $NetBSD: directive-export.mk,v 1.9 2023/08/20 20:48:32 rillig Exp $ 22c3632d1SSimon J. Gerraty# 32c3632d1SSimon J. Gerraty# Tests for the .export directive. 406b9b3e0SSimon J. Gerraty# 506b9b3e0SSimon J. Gerraty# See also: 606b9b3e0SSimon J. Gerraty# directive-misspellings.mk 72c3632d1SSimon J. Gerraty 82c3632d1SSimon J. Gerraty# TODO: Implementation 92c3632d1SSimon J. Gerraty 10956e45f6SSimon J. GerratyINDIRECT= indirect 11956e45f6SSimon J. GerratyVAR= value $$ ${INDIRECT} 12956e45f6SSimon J. Gerraty 1306b9b3e0SSimon J. Gerraty# Before 2020-12-13, this unusual expression invoked undefined behavior since 1406b9b3e0SSimon J. Gerraty# it accessed out-of-bounds memory via Var_Export -> ExportVar -> MayExport. 1506b9b3e0SSimon J. Gerraty.export ${:U } 1606b9b3e0SSimon J. Gerraty 17956e45f6SSimon J. Gerraty# A variable is exported using the .export directive. 18956e45f6SSimon J. Gerraty# During that, its value is expanded, just like almost everywhere else. 19956e45f6SSimon J. Gerraty.export VAR 20956e45f6SSimon J. Gerraty.if ${:!env | grep '^VAR'!} != "VAR=value \$ indirect" 21956e45f6SSimon J. Gerraty. error 22956e45f6SSimon J. Gerraty.endif 23956e45f6SSimon J. Gerraty 24956e45f6SSimon J. Gerraty# Undefining a variable that has been exported implicitly removes it from 25956e45f6SSimon J. Gerraty# the environment of all child processes. 26956e45f6SSimon J. Gerraty.undef VAR 27956e45f6SSimon J. Gerraty.if ${:!env | grep '^VAR' || true!} != "" 28956e45f6SSimon J. Gerraty. error 29956e45f6SSimon J. Gerraty.endif 30956e45f6SSimon J. Gerraty 31b0c40a00SSimon J. Gerraty# No syntactical argument means to export all variables. 3206b9b3e0SSimon J. Gerraty.export 33e2eeea75SSimon J. Gerraty 34b0c40a00SSimon J. Gerraty# An empty argument means no additional variables to export. 35b0c40a00SSimon J. Gerraty.export ${:U} 36b0c40a00SSimon J. Gerraty 37b0c40a00SSimon J. Gerraty 38b0c40a00SSimon J. Gerraty# Trigger the "This isn't going to end well" in ExportVarEnv. 39b0c40a00SSimon J. GerratyEMPTY_SHELL= ${:sh} 40b0c40a00SSimon J. Gerraty.export EMPTY_SHELL # only marked for export at this point 41b0c40a00SSimon J. Gerraty_!= :;: # Force the variable to be actually exported. 42b0c40a00SSimon J. Gerraty 43b0c40a00SSimon J. Gerraty 44*98875883SSimon J. Gerraty# If the '.export' directive exports a variable whose value contains a '$', 45*98875883SSimon J. Gerraty# the actual export action is deferred until a subprocess is started, assuming 46*98875883SSimon J. Gerraty# that only subprocesses access the environment variables. The ':localtime' 47*98875883SSimon J. Gerraty# modifier depends on the 'TZ' environment variable, without any subprocess. 48*98875883SSimon J. Gerratyexport TZ=${UTC} 49*98875883SSimon J. Gerraty# expect+1: 00:00:00 50*98875883SSimon J. Gerraty.info ${%T:L:localtime=86400} 51*98875883SSimon J. GerratyINDIRECT_TZ= ${:UAmerica/Los_Angeles} 52*98875883SSimon J. GerratyTZ= ${INDIRECT_TZ} 53*98875883SSimon J. Gerraty.export TZ 54*98875883SSimon J. Gerraty# expect+1: 00:00:00 55*98875883SSimon J. Gerraty.info ${%T:L:localtime=86400} 56*98875883SSimon J. Gerraty_!= echo 'force exporting the environment variables' 57*98875883SSimon J. Gerraty# expect+1: 16:00:00 58*98875883SSimon J. Gerraty.info ${%T:L:localtime=86400} 59*98875883SSimon J. Gerraty 60*98875883SSimon J. Gerraty 612c3632d1SSimon J. Gerratyall: 62