A ZIP file directory has a 16-bit field for the number of entries it
contains. There are 64-bit extensions to deal with that. Demonstrate
that git archive --format=zip currently doesn't use them and instead
overflows the field.
InfoZIP's unzip doesn't care about this field and extracts all files
anyway. Software that uses the directory for presenting a filesystem
like view quickly -- notably Windows -- depends on it, but doesn't
lend itself to an automatic test case easily. Use InfoZIP's zipinfo,
which probably isn't available everywhere but at least can provides
*some* way to check this field.
To speed things up a bit create and commit only a subset of the files
and build a fake tree out of duplicates and pass that to git archive.
Signed-off-by: Rene Scharfe <l.s.r@xxxxxx>
---
t/t5004-archive-corner-cases.sh | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/t/t5004-archive-corner-cases.sh b/t/t5004-archive-corner-cases.sh
index 654adda..c6bd729 100755
--- a/t/t5004-archive-corner-cases.sh
+++ b/t/t5004-archive-corner-cases.sh
@@ -115,4 +115,44 @@ test_expect_success 'archive empty subtree by direct pathspec' '
check_dir extract sub
'
+ZIPINFO=zipinfo
+
+test_lazy_prereq ZIPINFO '
+ n=$("$ZIPINFO" "$TEST_DIRECTORY"/t5004/empty.zip | sed -n "2s/.* //p")
+ test "x$n" = "x0"
+'
+
+test_expect_failure ZIPINFO 'zip archive with many entries' '
+ # add a directory with 256 files
+ mkdir 00 &&
+ for a in 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ do
+ for b in 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ do
+ : >00/$a$b
+ done
+ done &&
+ git add 00 &&
+ git commit -m "256 files in 1 directory" &&
+
+ # duplicate it to get 65536 files in 256 directories
+ subtree=$(git write-tree --prefix=00/) &&
+ for c in 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ do
+ for d in 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ do
+ echo "040000 tree $subtree $c$d"
+ done
+ done >tree &&
+ tree=$(git mktree <tree) &&
+
+ # zip them
+ git archive -o many.zip $tree &&
+
+ # check the number of entries in the ZIP file directory
+ expr 65536 + 256 >expect &&
+ "$ZIPINFO" many.zip | head -2 | sed -n "2s/.* //p" >actual &&
+ test_cmp expect actual
+'
+
test_done
--
2.5.0
--
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