[PATCH v3 0/8] fix test failure with busybox

[PATCH v3 0/8] fix test failure with busybox

[Đoàn Trần Công Danh]

Despite non-compiance from busybox's sh(1), grep(1), diff(1), find(1)
Alpine Linux is still a popular choice for container these days.

Fix false-positive failure in testsuite when run in Alpine Linux.

Đoàn Trần Công Danh (8):
  t4061: use POSIX compliant regex(7)
  test-lib-functions: test_cmp: eval $GIT_TEST_CMP
  t5003: drop the subshell in test_lazy_prereq
  t5003: skip conversion test if unzip -a is unavailable
  t5616: use rev-parse instead to get HEAD's object_id
  t7063: drop non-POSIX argument "-ls" from find(1)
  t4124: fix test for non-compliant diff(1)
  t5703: feed raw data into test-tool unpack-sideband

 t/helper/test-pkt-line.c           |  2 +-
 t/t4061-diff-indent.sh             |  2 +-
 t/t4124-apply-ws-rule.sh           |  6 ++++++
 t/t5003-archive-zip.sh             | 24 ++++++++++++------------
 t/t5616-partial-clone.sh           |  2 +-
 t/t5703-upload-pack-ref-in-want.sh |  5 +----
 t/t7063-status-untracked-cache.sh  |  2 +-
 t/test-lib-functions.sh            |  2 +-
 8 files changed, 24 insertions(+), 21 deletions(-)

Range-diff against v2:
1:  34f96548de = 1:  088905ab6f t4061: use POSIX compliant regex(7)
2:  50f46986a6 = 2:  691d9d47ba test-lib-functions: test_cmp: eval $GIT_TEST_CMP
3:  8719a07753 = 3:  759a589b83 t5003: drop the subshell in test_lazy_prereq
4:  457eecaf9b = 4:  e5b09c290c t5003: skip conversion test if unzip -a is unavailable
5:  d3bc855e17 = 5:  1b8740018c t5616: use rev-parse instead to get HEAD's object_id
6:  64472ec3bc ! 6:  abb21b9e51 t7063: drop non-POSIX argument "-ls" from find(1)
    @@ Commit message
         However, `-ls` flag isn't required by POSIX's find(1), and
         busybox(1) doesn't implement it.
     
    -    From the original conversation, it seems like find(1) with "-type d"
    -    could trigger enough "lstat(2)" to ask FreeBSD update mtime.
    -
    -    Use only filter "-type d" for now.
    +    Use "-exec ls -ld {} +" instead.
     
         Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
     
    @@ t/t7063-status-untracked-cache.sh: GIT_FORCE_UNTRACKED_CACHE=true
      
      sync_mtime () {
     -	find . -type d -ls >/dev/null
    -+	find . -type d >/dev/null
    ++	find . -type d -exec ls -ld {} + >/dev/null
      }
      
      avoid_racy() {
7:  51df6dd12d ! 7:  0502171f0f t4124: fix test for non-compliant diff(1)
    @@ Commit message
         POSIX's diff(1) requires output in normal diff format.
         However, busybox's diff's output is written in unified format.
     
    -    POSIX requires no option for normal-diff format.
    +    HP-UX's diff(1) doesn't understand "-u" as of now.
     
    -    A hint in test-lib-functions::test_cmp said `diff -u` isn't available
    -    everywhere.
    -
    -    Workaround this problem by assuming `diff(1)` output is unified
    +    Workaround this problem by checking "diff -u" output,
         if we couldn't make anything from normal-diff format.
     
         Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
    @@ t/t4124-apply-ws-rule.sh: test_fix () {
      
      	# find touched lines
      	$DIFF file target | sed -n -e "s/^> //p" >fixed
    -+	# busybox's diff(1) output unified format
    ++	# busybox's diff(1) doesn't output normal format
     +	if ! test -s fixed; then
    -+		$DIFF file target |
    ++		$DIFF -u file target |
     +		grep -v '^+++ target' |
     +		sed -e "/^+/s/+//" >fixed
     +	fi
8:  843c7f66d9 = 8:  8689e03400 t5703: feed raw data into test-tool unpack-sideband
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 1/8] t4061: use POSIX compliant regex(7)

[Đoàn Trần Công Danh]

BRE interprets `+` literally, and
`\+` is undefined for POSIX BRE, from:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_02

> The interpretation of an ordinary character preceded
> by an unescaped <backslash> ( '\\' ) is undefined, except for:
> - The characters ')', '(', '{', and '}'
> - The digits 1 to 9 inclusive
> - A character inside a bracket expression

This test is failing with busybox sed, the default sed of Alpine Linux

We have 2 options here:

- Using literal `+` because BRE will interpret it as-is, or
- Using character class `[+]` to defend against a sed that expects ERE

ERE-expected sed is theoretical at this point,
but we haven't found it, yet.
And, we may run into other problems with that sed.
Let's go with first option and fix it later if that sed could be found.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t4061-diff-indent.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t4061-diff-indent.sh b/t/t4061-diff-indent.sh
index 2affd7a100..0f7a6d97a8 100755
--- a/t/t4061-diff-indent.sh
+++ b/t/t4061-diff-indent.sh
@@ -17,7 +17,7 @@ compare_diff () {
 # Compare blame output using the expectation for a diff as reference.
 # Only look for the lines coming from non-boundary commits.
 compare_blame () {
-	sed -n -e "1,4d" -e "s/^\+//p" <"$1" >.tmp-1
+	sed -n -e "1,4d" -e "s/^+//p" <"$1" >.tmp-1
 	sed -ne "s/^[^^][^)]*) *//p" <"$2" >.tmp-2
 	test_cmp .tmp-1 .tmp-2 && rm -f .tmp-1 .tmp-2
 }
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 2/8] test-lib-functions: test_cmp: eval $GIT_TEST_CMP

[Đoàn Trần Công Danh]

Shell recognises first non-assignment token as command name.
With /bin/sh linked to either /bin/bash or /bin/dash,
`cd t/perf && ./p0000-perf-lib-sanity.sh -d -i -v` reports:

> test_cmp:1: command not found: diff -u

Using `eval` to unquote $GIT_TEST_CMP as same as precedence in `git_editor`.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/test-lib-functions.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 352c213d52..ab0e47ae17 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -905,7 +905,7 @@ test_expect_code () {
 # - not all diff versions understand "-u"
 
 test_cmp() {
-	$GIT_TEST_CMP "$@"
+	eval "$GIT_TEST_CMP" '"$@"'
 }
 
 # Check that the given config key has the expected value.
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 3/8] t5003: drop the subshell in test_lazy_prereq

[Đoàn Trần Công Danh]

test_lazy_prereq will be evaluated in a throw-away directory.

Drop unnecessary subshell and mkdir.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t5003-archive-zip.sh | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/t/t5003-archive-zip.sh b/t/t5003-archive-zip.sh
index 106eddbd85..df1374a312 100755
--- a/t/t5003-archive-zip.sh
+++ b/t/t5003-archive-zip.sh
@@ -7,12 +7,8 @@ test_description='git archive --format=zip test'
 SUBSTFORMAT=%H%n
 
 test_lazy_prereq UNZIP_SYMLINKS '
-	(
-		mkdir unzip-symlinks &&
-		cd unzip-symlinks &&
-		"$GIT_UNZIP" "$TEST_DIRECTORY"/t5003/infozip-symlinks.zip &&
-		test -h symlink
-	)
+	"$GIT_UNZIP" "$TEST_DIRECTORY"/t5003/infozip-symlinks.zip &&
+	test -h symlink
 '
 
 check_zip() {
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 4/8] t5003: skip conversion test if unzip -a is unavailable

[Đoàn Trần Công Danh]

Alpine Linux's default unzip(1) doesn't support `-a`.

Skip those tests on that platform.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t5003-archive-zip.sh | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/t/t5003-archive-zip.sh b/t/t5003-archive-zip.sh
index df1374a312..3b76d2eb65 100755
--- a/t/t5003-archive-zip.sh
+++ b/t/t5003-archive-zip.sh
@@ -11,6 +11,10 @@ test_lazy_prereq UNZIP_SYMLINKS '
 	test -h symlink
 '
 
+test_lazy_prereq UNZIP_CONVERT '
+	"$GIT_UNZIP" -a "$TEST_DIRECTORY"/t5003/infozip-symlinks.zip
+'
+
 check_zip() {
 	zipfile=$1.zip
 	listfile=$1.lst
@@ -35,33 +39,33 @@ check_zip() {
 	extracted=${dir_with_prefix}a
 	original=a
 
-	test_expect_success UNZIP " extract ZIP archive with EOL conversion" '
+	test_expect_success UNZIP_CONVERT " extract ZIP archive with EOL conversion" '
 		(mkdir $dir && cd $dir && "$GIT_UNZIP" -a ../$zipfile)
 	'
 
-	test_expect_success UNZIP " validate that text files are converted" "
+	test_expect_success UNZIP_CONVERT " validate that text files are converted" "
 		test_cmp_bin $extracted/text.cr $extracted/text.crlf &&
 		test_cmp_bin $extracted/text.cr $extracted/text.lf
 	"
 
-	test_expect_success UNZIP " validate that binary files are unchanged" "
+	test_expect_success UNZIP_CONVERT " validate that binary files are unchanged" "
 		test_cmp_bin $original/binary.cr   $extracted/binary.cr &&
 		test_cmp_bin $original/binary.crlf $extracted/binary.crlf &&
 		test_cmp_bin $original/binary.lf   $extracted/binary.lf
 	"
 
-	test_expect_success UNZIP " validate that diff files are converted" "
+	test_expect_success UNZIP_CONVERT " validate that diff files are converted" "
 		test_cmp_bin $extracted/diff.cr $extracted/diff.crlf &&
 		test_cmp_bin $extracted/diff.cr $extracted/diff.lf
 	"
 
-	test_expect_success UNZIP " validate that -diff files are unchanged" "
+	test_expect_success UNZIP_CONVERT " validate that -diff files are unchanged" "
 		test_cmp_bin $original/nodiff.cr   $extracted/nodiff.cr &&
 		test_cmp_bin $original/nodiff.crlf $extracted/nodiff.crlf &&
 		test_cmp_bin $original/nodiff.lf   $extracted/nodiff.lf
 	"
 
-	test_expect_success UNZIP " validate that custom diff is unchanged " "
+	test_expect_success UNZIP_CONVERT " validate that custom diff is unchanged " "
 		test_cmp_bin $original/custom.cr   $extracted/custom.cr &&
 		test_cmp_bin $original/custom.crlf $extracted/custom.crlf &&
 		test_cmp_bin $original/custom.lf   $extracted/custom.lf
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 5/8] t5616: use rev-parse instead to get HEAD's object_id

[Đoàn Trần Công Danh]

Only HEAD's object_id is necessary, rev-list is an overkill.

Despite POSIX requires grep(1) treat single pattern with <newline>
as multiple patterns.
busybox's grep(1) (as of v1.31.1) haven't implemented it yet.

Use rev-parse to simplify the test and avoid busybox unimplemented
features.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t5616-partial-clone.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 77bb91e976..09e640cae4 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -49,7 +49,7 @@ test_expect_success 'do partial clone 1' '
 test_expect_success 'verify that .promisor file contains refs fetched' '
 	ls pc1/.git/objects/pack/pack-*.promisor >promisorlist &&
 	test_line_count = 1 promisorlist &&
-	git -C srv.bare rev-list HEAD >headhash &&
+	git -C srv.bare rev-parse --verify HEAD >headhash &&
 	grep "$(cat headhash) HEAD" $(cat promisorlist) &&
 	grep "$(cat headhash) refs/heads/master" $(cat promisorlist)
 '
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 6/8] t7063: drop non-POSIX argument "-ls" from find(1)

[Đoàn Trần Công Danh]

Since commit 6b7728db81, (t7063: work around FreeBSD's lazy mtime
update feature, 2016-08-03), we started to use ls as a trick to update
directory's mtime.

However, `-ls` flag isn't required by POSIX's find(1), and
busybox(1) doesn't implement it.

Use "-exec ls -ld {} +" instead.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t7063-status-untracked-cache.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t7063-status-untracked-cache.sh b/t/t7063-status-untracked-cache.sh
index 190ae149cf..6738497ea7 100755
--- a/t/t7063-status-untracked-cache.sh
+++ b/t/t7063-status-untracked-cache.sh
@@ -18,7 +18,7 @@ GIT_FORCE_UNTRACKED_CACHE=true
 export GIT_FORCE_UNTRACKED_CACHE
 
 sync_mtime () {
-	find . -type d -ls >/dev/null
+	find . -type d -exec ls -ld {} + >/dev/null
 }
 
 avoid_racy() {
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 7/8] t4124: fix test for non-compliant diff(1)

[Đoàn Trần Công Danh]

POSIX's diff(1) requires output in normal diff format.
However, busybox's diff's output is written in unified format.

HP-UX's diff(1) doesn't understand "-u" as of now.

Workaround this problem by checking "diff -u" output,
if we couldn't make anything from normal-diff format.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t4124-apply-ws-rule.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
index 971a5a7512..691f82da9f 100755
--- a/t/t4124-apply-ws-rule.sh
+++ b/t/t4124-apply-ws-rule.sh
@@ -52,6 +52,12 @@ test_fix () {
 
 	# find touched lines
 	$DIFF file target | sed -n -e "s/^> //p" >fixed
+	# busybox's diff(1) doesn't output normal format
+	if ! test -s fixed; then
+		$DIFF -u file target |
+		grep -v '^+++ target' |
+		sed -e "/^+/s/+//" >fixed
+	fi
 
 	# the changed lines are all expected to change
 	fixed_cnt=$(wc -l <fixed)
-- 
2.26.0.rc2.357.g1e1ba0441d

[PATCH v3 8/8] t5703: feed raw data into test-tool unpack-sideband

[Đoàn Trần Công Danh]

busybox's sed isn't binary clean.
Thus, triggers false-negative on this test.

We could replace sed with perl on this usecase.
But, we could slightly modify the helper to discard unwanted data in the
beginning.

Fix the false negative by updating this helper.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/helper/test-pkt-line.c           | 2 +-
 t/t5703-upload-pack-ref-in-want.sh | 5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/t/helper/test-pkt-line.c b/t/helper/test-pkt-line.c
index 282d536384..12ca698e17 100644
--- a/t/helper/test-pkt-line.c
+++ b/t/helper/test-pkt-line.c
@@ -67,7 +67,7 @@ static void unpack_sideband(void)
 		case PACKET_READ_NORMAL:
 			band = reader.line[0] & 0xff;
 			if (band < 1 || band > 2)
-				die("unexpected side band %d", band);
+				continue; /* skip non-sideband packets */
 			fd = band;
 
 			write_or_die(fd, reader.line + 1, reader.pktlen - 1);
diff --git a/t/t5703-upload-pack-ref-in-want.sh b/t/t5703-upload-pack-ref-in-want.sh
index 7fba3063bf..a34460f7d8 100755
--- a/t/t5703-upload-pack-ref-in-want.sh
+++ b/t/t5703-upload-pack-ref-in-want.sh
@@ -13,10 +13,7 @@ get_actual_refs () {
 }
 
 get_actual_commits () {
-	sed -n -e '/packfile/,/0000/{
-		/packfile/d
-		p
-		}' <out | test-tool pkt-line unpack-sideband >o.pack &&
+	test-tool pkt-line unpack-sideband <out >o.pack &&
 	git index-pack o.pack &&
 	git verify-pack -v o.idx >objs &&
 	grep commit objs | cut -d" " -f1 | sort >actual_commits
-- 
2.26.0.rc2.357.g1e1ba0441d