evar_push/evar_pop: new api for saving/restoring variables on a stack

1 files changed, 97 insertions, 0 deletions

diff --git a/eclass/tests/eutils:evar.sh b/eclass/tests/eutils:evar.sh
new file mode 100755
index 000000000000..837818de6730
--- /dev/null
+++ b/eclass/tests/eutils:evar.sh
@@ -0,0 +1,97 @@
+#!/bin/bash
+
+source tests-common.sh
+
+inherit eutils
+
+tbegin "simple push/pop"
+VAR=1
+evar_push VAR
+pu=$?
+VAR=2
+evar_pop
+po=$?
+[[ ${pu}${po}${VAR} == "001" ]]
+tend $?
+
+tbegin "unset push/pop"
+unset VAR
+evar_push VAR
+pu=$?
+VAR=2
+evar_pop
+po=$?
+[[ ${pu}${po}${VAR+set} == "00" ]]
+tend $?
+
+tbegin "empty push/pop"
+VAR=
+evar_push VAR
+pu=$?
+VAR=2
+evar_pop
+po=$?
+[[ ${pu}${po}${VAR+set}${VAR} == "00set" ]]
+tend $?
+
+tbegin "export push/pop"
+export VAR=exported
+evar_push VAR
+pu=$?
+VAR=2
+evar_pop
+po=$?
+var=$(bash -c 'echo ${VAR}')
+[[ ${pu}${po}${var} == "00exported" ]]
+tend $?
+
+tbegin "unexport push/pop"
+unset VAR
+VAR=not-exported
+evar_push VAR
+pu=$?
+VAR=2
+evar_pop
+po=$?
+var=$(bash -c 'echo ${VAR+set}')
+[[ ${pu}${po}${VAR}${var} == "00not-exported" ]]
+tend $?
+
+tbegin "multi push/pop"
+A=a B=b C=c
+evar_push A B C
+pu=$?
+A=A B=B C=C
+evar_pop 1
+po1=$?
+[[ ${A}${B}${C} == "ABc" ]]
+po2=$?
+evar_pop 2
+po3=$?
+var=$(bash -c 'echo ${VAR+set}')
+[[ ${pu}${po1}${po2}${po3}${A}${B}${C} == "0000abc" ]]
+tend $?
+
+tbegin "simple push_set/pop"
+VAR=1
+evar_push_set VAR 2
+pu=$?
+[[ ${VAR} == "2" ]]
+po1=$?
+evar_pop
+po2=$?
+[[ ${pu}${po1}${po2}${VAR} == "0001" ]]
+tend $?
+
+tbegin "unset push_set/pop"
+VAR=1
+evar_push_set VAR
+pu=$?
+[[ ${VAR+set} != "set" ]]
+po1=$?
+evar_pop
+po2=$?
+[[ ${pu}${po1}${po2}${VAR} == "0001" ]]
+tend $?
+
+texit