Junio C Hamano <gitster@xxxxxxxxx> 于2019年2月1日周五 上午5:44写道：
> > +create_commits () {
> > + parent=
> > + for name in A B C D E F G H I J K L M N O P Q R
> > + do
> > + test_tick &&
> > + T=$(git write-tree) &&
>
> Move this outside loop, not for efficiency but for clarity. This
> helper function creates a single empty tree and bunch of commits
> that hold the same empty tree, arranged as a single strand of
> pearls.
Will rewrite as:
create_commits () {
parent=
T=$(git write-tree) &&
for name in A B C D E F G H I J K L M N O P Q R
>
> By the way, I had to draw a table like this to figure out ...
>
> T A B C D E F G H I J K L M N O P Q R
> 1 x x x x x x x x
> 2 x x x x x x x
> 3 x x x x x x
> 4 x x x x x
> 5 x x x x
> 6 x x x
> 7 x x
> 8 x
>
> ... what is going on. Perhaps something like this would help other
> readers near the top of the file (or in test_description)?
Nice chart, will edit test_description as follows:
test_description='git pack-redundant test
In order to test git-pack-redundant, we will create a number of
redundant
packs in the repository `master.git`. The relationship between
packs (P1-P8)
and objects (T,A-R) is show in the following chart:
| T A B C D E F G H I J K L M N O P Q R
---+--------------------------------------
P1 | x x x x x x x x
P2 | x x x x x x x
P3 | x x x x x x
P4 | x x x x x
P5 | x x x x
P6 | x x x
P7 | x x
P8 | x
Another repoisitory `shared.git` has unique objects (X-Z), while
share others
objects through alt-odb (of `master.git`). The relationship
between packs
and objects is as follows:
| T A B C D E F G H I J K L M N O P Q R X Y Z
---+----------------------------------------------
Px1| x x x x x x
Px2| x x x x x x
'
>
>
> > +format_packfiles () {
> > + sed \
> > + -e "s#.*/pack-\(.*\)\.idx#\1#" \
> > + -e "s#.*/pack-\(.*\)\.pack#\1#" |
> > + sort -u |
> > + while read p
> > + do
> > + if test -z "$(eval echo \${P$p})"
> > + then
> > + echo $p
>
> All the "expected output" below will expect P$n:${P$n} prepared by
> various create_pack_$n helpers we saw earlier, so an unknown
> packfile would be detected as a line that this emits. Is that the
> idea?
Right. During the reroll, a typo makes an empty output, so I decide
to make this change.
> > + else
> > + eval echo "\${P$p}"
> > + fi
> > + done |
> > + sort
> > +}
> > +
> > +test_expect_success 'setup master.git' '
> > + git init --bare master.git &&
> > + cd master.git &&
> > + create_commits
> > +'
>
> Everything below will be done inside master.git? Avoid cd'ing
> around in random places in the test script, as a failure in any of
> the steps that does cd would start later tests in an unexpected
> place, if you can.
The first 10 test cases will run inside master.git, and others will
run inside shared.git. Only run cd inside the two `setup` test cases.
> > +cat >expected <<EOF
> > +P2:$P2
> > +EOF
> > +
> > +test_expect_success 'one of pack-2/pack-3 is redundant' '
> > + git pack-redundant --all >out &&
> > + format_packfiles <out >actual &&
> > + test_cmp expected actual
> > +'
>
> Do the preparation of file "expect" (most of the tests compare
> 'expect' vs 'actual', not 'expected') _inside_ the next test that
> uses it. i.e.
>
> test_expect_success 'with 1 4 and 5, either 2 or 3 can be omitted' '
> cat >expect <<-EOF &&
> P2:$P2
> EOF
> git pack-redundant --all >out &&
> format ... >actual &&
> test_cmp expect actual
> '
Will do.
> > +test_expect_success 'setup shared.git' '
> > + cd "$TRASH_DIRECTORY" &&
> > + git clone -q --mirror master.git shared.git &&
>
> Why "-q"?
To make verbose output cleaner.
> > + cd shared.git &&
> > + printf "../../master.git/objects" >objects/info/alternates
> > +'
>
> Why not echo? I recall designing the alternates file to be a plain
> text file. Is it necessary to leave the line incomplete?
Forgot "\n", will append.
>
> > +test_expect_success 'remove redundant packs by alt-odb, no packs left' '
> > + git pack-redundant --all --alt-odb | xargs rm &&
> > + git fsck --no-progress &&
>
> Why "--no-progress"?
To make verbose output cleaner.
>
> > + test_must_fail git pack-redundant --all --alt-odb >actual 2>&1 &&
> > + test_cmp expected actual
> > +'
> > +
> > +create_commits_others () {
> > + parent=$(git rev-parse HEAD)
Will append "&&".
