Đoàn Trần Công Danh <congdanhqx@xxxxxxxxx> writes:
> From: "brian m. carlson" <sandals@xxxxxxxxxxxxxxxxxxxx>
>
> From 72f936b1 (t4013: make test hash independent, 2020-02-07),
> we started to adjust metadata of git-diff's output in order to
> ignore uninteresting metadata which is dependent of underlying hash
> algorithm.
>
> However, we forgot to special case all-zero object names, which is
> special for not-exist objects, in consequence, we could't catch
"for missing objects" would probably the best, even though
"non-existing objects" would also work.
> possible future bugs where object names is all-zeros including but
s/is/are/
> not limiting to:
"not limited to", I think.
> * show intend-to-add entry
> * deleted entry
> * diff between index and working tree with new file
>
> In addition, in the incoming change, we would like to test for
s/incoming/upcoming/?
> diff with 10 characters index, which is also not covered by current
"test for customizing the length of abbreviated blob object names on
the index line"?
s/covered/supported/
> diff-processor logic.
>
> Let's fix the bug for all-zero object names and extend object names'
> abbrev to 16 while we're at it.
"and support abbreviation of object names up to 16 bytes"?
Also while we are at it, we fixed the post-processing not to touch
the file modes, which were mistakenly munged in the older code as if
they were object names abbreviated to 7 hexdigits.
> diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
> index 5f97dd6d65..f6bdfc13fd 100755
> --- a/t/t4013-diff-various.sh
> +++ b/t/t4013-diff-various.sh
> @@ -130,27 +130,45 @@ test_expect_success setup '
> EOF
>
> process_diffs () {
> - _x04="[0-9a-f][0-9a-f][0-9a-f][0-9a-f]" &&
> - _x07="$_x05[0-9a-f][0-9a-f]" &&
> - sed -e "s/$OID_REGEX/$ZERO_OID/g" \
> - -e "s/From $_x40 /From $ZERO_OID /" \
> - -e "s/from $_x40)/from $ZERO_OID)/" \
> - -e "s/commit $_x40\$/commit $ZERO_OID/" \
> - -e "s/commit $_x40 (/commit $ZERO_OID (/" \
> - -e "s/$_x40 $_x40 $_x40/$ZERO_OID $ZERO_OID $ZERO_OID/" \
> - -e "s/$_x40 $_x40 /$ZERO_OID $ZERO_OID /" \
> - -e "s/^$_x40 $_x40$/$ZERO_OID $ZERO_OID/" \
> - -e "s/^$_x40 /$ZERO_OID /" \
> - -e "s/^$_x40$/$ZERO_OID/" \
> - -e "s/$_x07\.\.$_x07/fffffff..fffffff/g" \
> - -e "s/$_x07,$_x07\.\.$_x07/fffffff,fffffff..fffffff/g" \
> - -e "s/$_x07 $_x07 $_x07/fffffff fffffff fffffff/g" \
> - -e "s/$_x07 $_x07 /fffffff fffffff /g" \
> - -e "s/Merge: $_x07 $_x07/Merge: fffffff fffffff/g" \
> - -e "s/$_x07\.\.\./fffffff.../g" \
> - -e "s/ $_x04\.\.\./ ffff.../g" \
> - -e "s/ $_x04/ ffff/g" \
> - "$1"
> + perl -e '
> + my $oid_length = length($ARGV[0]);
> + my $x40 = "[0-9a-f]{40}";
> + my $xab = "[0-9a-f]{4,16}";
> + my $orx = "[0-9a-f]" x $oid_length;
> +
> + sub munge_oid {
> + my ($oid) = @_;
> + my $x;
> +
> + return "" unless length $oid;
> +
> + if ($oid =~ /^(100644|100755|120000)$/) {
> + return $oid;
> + }
> +
> + if ($oid =~ /^0*$/) {
> + $x = "0";
> + } else {
> + $x = "f";
> + }
> +
> + if (length($oid) == 40) {
> + return $x x $oid_length;
> + } else {
> + return $x x length($oid);
> + }
> + }
> +
> + while (<STDIN>) {
> + s/($orx)/munge_oid($1)/ge;
> + s/From ($x40)( |\))/"From " . munge_oid($1) . $2/ge;
> + s/commit ($x40)($| \(from )($x40?)/"commit " . munge_oid($1) . $2 . munge_oid($3)/ge;
> + s/\b($x40)( |\.\.|$)/munge_oid($1) . $2/ge;
> + s/^($x40)($| )/munge_oid($1) . $2/e;
> + s/($xab)(\.\.|,| |\.\.\.|$)/munge_oid($1) . $2/ge;
> + print;
> + }
> + ' "$ZERO_OID" <"$1"
> }
>
> V=$(git version | sed -e 's/^git version //' -e 's/\./\\./g')
