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trailer: add new .cmd config option

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The `trailer.<token>.command` configuration variable
specifies a command (run via the shell, so it does not have
to be a single name or path to the command, but can be a
shell script), and the first occurrence of substring $ARG is
replaced with the value given to the `interpret-trailer`
command for the token in a '--trailer <token>=<value>' argument.

This has three downsides:

* The use of $ARG in the mechanism misleads the users that
the value is passed in the shell variable, and tempt them
to use $ARG more than once, but that would not work, as
the second and subsequent $ARG are not replaced.

* Because $ARG is textually replaced without regard to the
shell language syntax, even '$ARG' (inside a single-quote
pair), which a user would expect to stay intact, would be
replaced, and worse, if the value had an unmatched single
quote (imagine a name like "O'Connor", substituted into
NAME='$ARG' to make it NAME='O'Connor'), it would result in
a broken command that is not syntactically correct (or
worse).

* The first occurrence of substring `$ARG` will be replaced
with the empty string, in the command when the command is
first called to add a trailer with the specified <token>.
This is a bad design, the nature of automatic execution
causes it to add a trailer that we don't expect.

Introduce a new `trailer.<token>.cmd` configuration that
takes higher precedence to deprecate and eventually remove
`trailer.<token>.command`, which passes the value as an
argument to the command.  Instead of "$ARG", users can
refer to the value as positional argument, $1, in their
scripts. At the same time, in order to allow
`git interpret-trailers` to better simulate the behavior
of `git command -s`, 'trailer.<token>.cmd' will not
automatically execute.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Christian Couder <christian.couder@gmail.com>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
ZheNing Hu
2021-05-03 15:41:05 +00:00
committed by Junio C Hamano
parent 57dcb6575b
commit c364b7ef51
3 changed files with 175 additions and 19 deletions
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84
t/t7513-interpret-trailers.sh
View File

@@ -51,6 +51,69 @@ test_expect_success 'setup' '
EOF
'
test_expect_success 'with cmd' '
test_when_finished "git config --remove-section trailer.bug" &&
git config trailer.bug.key "Bug-maker: " &&
git config trailer.bug.ifExists "add" &&
git config trailer.bug.cmd "echo \"maybe is\"" &&
cat >expected2 <<-EOF &&
Bug-maker: maybe is him
Bug-maker: maybe is me
EOF
git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
>actual2 &&
test_cmp expected2 actual2
'
test_expect_success 'with cmd and $1' '
test_when_finished "git config --remove-section trailer.bug" &&
git config trailer.bug.key "Bug-maker: " &&
git config trailer.bug.ifExists "add" &&
git config trailer.bug.cmd "echo \"\$1\" is" &&
cat >expected2 <<-EOF &&
Bug-maker: him is him
Bug-maker: me is me
EOF
git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
>actual2 &&
test_cmp expected2 actual2
'
test_expect_success 'with cmd and $1 with sh -c' '
test_when_finished "git config --remove-section trailer.bug" &&
git config trailer.bug.key "Bug-maker: " &&
git config trailer.bug.ifExists "replace" &&
git config trailer.bug.cmd "sh -c \"echo who is \"\$1\"\"" &&
cat >expected2 <<-EOF &&
Bug-maker: who is me
EOF
git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
>actual2 &&
test_cmp expected2 actual2
'
test_expect_success 'with cmd and $1 with shell script' '
test_when_finished "git config --remove-section trailer.bug" &&
git config trailer.bug.key "Bug-maker: " &&
git config trailer.bug.ifExists "replace" &&
git config trailer.bug.cmd "./echoscript" &&
cat >expected2 <<-EOF &&
Bug-maker: who is me
EOF
cat >echoscript <<-EOF &&
#!/bin/sh
echo who is "\$1"
EOF
chmod +x echoscript &&
git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
>actual2 &&
test_cmp expected2 actual2
'
test_expect_success 'without config' '
sed -e "s/ Z\$/ /" >expected <<-\EOF &&
@@ -1274,6 +1337,27 @@ test_expect_success 'setup a commit' '
git commit -m "Add file a.txt"
'
test_expect_success 'cmd takes precedence over command' '
test_when_finished "git config --unset trailer.fix.cmd" &&
git config trailer.fix.ifExists "replace" &&
git config trailer.fix.cmd "test -n \"\$1\" && git log -1 --oneline --format=\"%h (%aN)\" \
--abbrev-commit --abbrev=14 \"\$1\" || true" &&
git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" \
--abbrev-commit --abbrev=14 \$ARG" &&
FIXED=$(git log -1 --oneline --format="%h (%aN)" --abbrev-commit --abbrev=14 HEAD) &&
cat complex_message_body >expected2 &&
sed -e "s/ Z\$/ /" >>expected2 <<-EOF &&
Fixes: $FIXED
Acked-by= Z
Reviewed-by:
Signed-off-by: Z
Signed-off-by: A U Thor <author@example.com>
EOF
git interpret-trailers --trailer "review:" --trailer "fix=HEAD" \
<complex_message >actual2 &&
test_cmp expected2 actual2
'
test_expect_success 'with command using $ARG' '
git config trailer.fix.ifExists "replace" &&
git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" --abbrev-commit --abbrev=14 \$ARG" &&