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minimal/do: redo vs redo-ifchange, and fix empty target handling.

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We previously assumed that redo and redo-ifchange are the same in
minimal/do's design, because it rebuilds all targets on every run, and
so there's no reason to ever build the same target more than once.

Unfortunately that's incorrect: if you run 'redo x' from two points in
a single run (or even twice in the same .do file), we expect x to be
built twice.  If you wanted redo to decide whether to build it the
second time, you should have used redo-ifchange.

t/102-empty/touchtest was trying to test for this.  However, a
second bug in minimal/do made the test pass anyway.  minimal/do would
*always* rebuild any target x that produced no output, not caring
whether it had tried to build before, whether you used redo or
redo-ifchange.  And while we tested that redo would redo a file that
had been deleted, we didn't ensure that it would redo a file that was
*not* deleted, nor that redo-ifchange would *not* redo that file.

Fix both bugs in minimal/do, and make t/102-empty/touchtest cover the
missing cases.
This commit is contained in:
Avery Pennarun 2018-10-17 01:42:32 -04:00
commit f345eae290
3 changed files with 32 additions and 3 deletions
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2
t/102-empty/clean.do
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@ -1 +1 @@
rm -f touch1 *~ .*~
rm -f touch1 touch1-ran *~ .*~

30
t/102-empty/touchtest.do
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@ -2,12 +2,40 @@
# between "real" redo and minimal/do, so clean it up.
rm -f touch1
# simply create touch1
echo 'echo hello' >touch1.do
redo touch1
[ -e touch1 ] || exit 55
[ "$(cat touch1)" = "hello" ] || exit 56
# ensure that 'redo touch1' always re-runs touch1.do even if we have
# already built touch1 in this session, and even if touch1 already exists.
echo 'echo hello2' >touch1.do
redo touch1
[ "$(cat touch1)" = "hello2" ] || exit 57
# ensure that touch1 is rebuilt even if it got deleted after the last redo
# inside the same session. Also ensure that we can produce a zero-byte
# output file explicitly.
rm -f touch1
echo 'touch $3' >touch1.do
redo touch1
[ -e touch1 ] || exit 66
[ -z "$(cat touch1)" ] || exit 77
[ -z "$(cat touch1)" ] || exit 67
# Also test that zero bytes of output does not create the file at all, as
# opposed to creating a zero-byte file.
rm -f touch1
echo 'touch touch1-ran' >touch1.do
redo touch1
[ -e touch1 ] && exit 75
[ -e touch1-ran ] || exit 76
rm -f touch1-ran
# Make sure that redo-ifchange *won't* rebuild touch1 if we have already
# built it, even if building it did not produce an output file.
redo-ifchange touch1
[ -e touch1 ] && exit 77
[ -e touch1-ran ] && exit 78
rm -f touch1.do