[PATCH v2 2/2] t7900: make macOS-specific test work on Windows

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Although `git maintenance start` and `git maintenance stop` necessarily
invoke platform-specific scheduling utilities, their related tests have
been carefully crafted -- with one minor exception -- to work correctly
on any platform, thus improving overall coverage. The exception is that
the macOS-specific test fails on Windows due to non-portable use of
`$(id -u)` and comparison involving the value of $HOME.

In particular, on Windows, the value of getuid() called by the C code is
not guaranteed to be the same as `$(id -u)` invoked by the test. This is
because `git.exe` is a native Windows program, whereas the utility
programs run by the test script mostly utilize the MSYS2 runtime, which
emulates a POSIX-like environment. Since the purpose of the test is to
check that the input to the hook is well-formed, the actual user ID is
immaterial, thus we can work around the problem by making the the test
UID-agnostic.

As for comparison of $HOME, it suffers from the typical shortcoming on
Windows in which the same path may be represented two different ways
depending upon its source (i.e. as a Windows path
`C:/git-sdk-64/usr/src/git/foo` versus as a Unix path
`/usr/src/git/foo`).

Fix both problems and drop the !MINGW prerequisite from the
macOS-specific test, thus allowing the test to run on Windows, as well.

Helped-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
Signed-off-by: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
---
 t/t7900-maintenance.sh | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
index ef3aec3253..514977a838 100755
--- a/t/t7900-maintenance.sh
+++ b/t/t7900-maintenance.sh
@@ -408,11 +408,12 @@ test_expect_success 'start preserves existing schedule' '
 	grep "Important information!" cron.txt
 '
 
-test_expect_success !MINGW 'start and stop macOS maintenance' '
-	uid=$(id -u) &&
+test_expect_success 'start and stop macOS maintenance' '
+	# ensure $HOME can be compared against hook arguments on all platforms
+	pfx=$(cd "$HOME" && pwd) &&
 
 	write_script print-args <<-\EOF &&
-	echo $* >>args
+	echo $* | sed "s:gui/[0-9][0-9]*:gui/[UID]:" >>args
 	EOF
 
 	rm -f args &&
@@ -432,11 +433,11 @@ test_expect_success !MINGW 'start and stop macOS maintenance' '
 	rm -f expect &&
 	for frequency in hourly daily weekly
 	do
-		PLIST="$HOME/Library/LaunchAgents/org.git-scm.git.$frequency.plist" &&
+		PLIST="$pfx/Library/LaunchAgents/org.git-scm.git.$frequency.plist" &&
 		test_xmllint "$PLIST" &&
 		grep schedule=$frequency "$PLIST" &&
-		echo "bootout gui/$uid $PLIST" >>expect &&
-		echo "bootstrap gui/$uid $PLIST" >>expect || return 1
+		echo "bootout gui/[UID] $PLIST" >>expect &&
+		echo "bootstrap gui/[UID] $PLIST" >>expect || return 1
 	done &&
 	test_cmp expect args &&
 
@@ -446,7 +447,7 @@ test_expect_success !MINGW 'start and stop macOS maintenance' '
 	# stop does not unregister the repo
 	git config --get --global maintenance.repo "$(pwd)" &&
 
-	printf "bootout gui/$uid $HOME/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
+	printf "bootout gui/[UID] $pfx/Library/LaunchAgents/org.git-scm.git.%s.plist\n" \
 		hourly daily weekly >expect &&
 	test_cmp expect args &&
 	ls "$HOME/Library/LaunchAgents" >actual &&
-- 
2.29.2.576.ga3fc446d84




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