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From: ZheNing Hu <adlternative@gmail.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
	git <git@vger.kernel.org>, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v7] [GSOC] trailer: add new trailer.<token>.cmd config option
Date: Wed, 7 Apr 2021 12:51:30 +0800
Message-ID: <CAOLTT8Rr_eXXwj3pXLF9zkTcgqu+w5ObH+f1_krrxoW1rQtwZw@mail.gmail.com> (raw)
In-Reply-To: <CAP8UFD3Ga=HR4YsS8UvgEQF9982be_wa8dUzniGsri+6qoEMHg@mail.gmail.com>

Christian Couder <christian.couder@gmail.com> 于2021年4月7日周三 上午12:23写道:
>
> On Sun, Apr 4, 2021 at 3:11 PM ZheNing Hu via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
> >
> > From: ZheNing Hu <adlternative@gmail.com>
> >
> > The `trailer.<token>.command` configuration variable
> > specifies a command (run via the shell, so it does not have
> > to be a single name of 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.  This has two 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 unmatching single
>
> s/unmatching/unmatched/
>
> > 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).
>
> Good explanation of the issues with ".command"!
>

Credit for Junio.

> > Introduce a new `trailer.<token>.cmd` configuration that
> > takes higher precedence to deprecate and eventually remove
> > `trailer.<token>.command`, which passes the value as a
> > parameter to the command.  Instead of "$ARG", the users will
>
> s/a parameter/an argument/
> s/the users will/users can/
>
> > refer to the value as positional argument, $1, in their
> > scripts.
> >
> > Helped-by: Junio C Hamano <gitster@pobox.com>
> > Helped-by: Christian Couder <christian.couder@gmail.com>
> > Signed-off-by: ZheNing Hu <adlternative@gmail.com>
> > ---
> >     [GSOC] trailer: add new trailer..cmd config option
>
> Maybe <token> has been removed from "trailer.<token>.cmd" above
> because it has been interpreted as an HTML or XML tag?
>

Aha, It may well be so.
Maybe change to "[GSOC] trailer add .cmd config option"?

> >     In https://lore.kernel.org/git/xmqqv99i4ck2.fsf@gitster.g/ Junio and
> >     Christian talked about the problem of using strbuf_replace() to replace
> >     $ARG:
> >
> >      1. if user's script have more than one $ARG, only the first one will be
>
> s/user's script have/the user's script has/
>
> >         replaced, which is incorrected.
> >      2. $ARG is textually replaced without shell syntax, which may result a
> >         broken command when $ARG include some unmatching single quote, very
> >         unsafe.
>
> Yeah, good summary of the issues with ".command"
>
> >     Now pass trailer value as $1 to the trailer command with another
> >     trailer.<token>.cmd config, to solve these above two problems,
> >
> >     We are now writing documents that are more readable and correct than
> >     before.
>
> Yeah, correcting the doc is a good thing to do. By the way, as I said
> to Junio, it might be better to make the doc for ".command" more
> readable and correct in a first patch separate from the patch
> introducing ".cmd".
>
> If you really want to do both in the same patch you should tell that
> in the commit message too, not just here after the "---" line.
>

I actually tried to write it yesterday, but...

diff --git a/Documentation/git-interpret-trailers.txt
b/Documentation/git-interpret-trailers.txt
index 96ec6499f0..39f742b3dc 100644
--- a/Documentation/git-interpret-trailers.txt
+++ b/Documentation/git-interpret-trailers.txt
@@ -237,20 +237,20 @@ trailer.<token>.command::
        specified <token>.
 +
 When this option is specified, the behavior is as if a special
-'<token>=<value>' argument were added at the beginning of the command
-line, where <value> is taken to be the standard output of the
-specified command with any leading and trailing whitespace trimmed
-off.
+'<token>=<value>' argument were added at the beginning of the
+"git interpret-trailers" command, where <value> is taken to be the
+standard output of the specified command with any leading and
+trailing whitespace trimmed off.
 +
-If the command contains the `$ARG` string, this string will be
-replaced with the <value> part of an existing trailer with the same
-<token>, if any, before the command is launched.
+The first occurrence of substring $ARG will be replaced with the
+<value> part of an existing trailer with the same <token>, if any,
+before the command is launched.
 +
 If some '<token>=<value>' arguments are also passed on the command
-line, when a 'trailer.<token>.command' is configured, the command will
-also be executed for each of these arguments. And the <value> part of
-these arguments, if any, will be used to replace the `$ARG` string in
-the command.
+line, when a 'trailer.<token>.cmd' is configured, the command is run
+once for each `--trailer <token>=<value>` on the command line with the
+same <token>. And the <value> part of these arguments, if any, will be
+used to replace the fist $ARG string in the command.

Since I am based on the document in the second patch, you have also
uncovered some points worthy of modification below,
so temporarily what I wrote is not accurate enough.

> >  Documentation/git-interpret-trailers.txt | 86 +++++++++++++++++++----
> >  t/t7513-interpret-trailers.sh            | 87 +++++++++++++++++++++++-
> >  trailer.c                                | 37 +++++++---
> >  3 files changed, 186 insertions(+), 24 deletions(-)
> >
> > diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
> > index 96ec6499f001..83600e93390d 100644
> > --- a/Documentation/git-interpret-trailers.txt
> > +++ b/Documentation/git-interpret-trailers.txt
> > @@ -236,21 +236,36 @@ trailer.<token>.command::
> >         be called to automatically add or modify a trailer with the
> >         specified <token>.
> >  +
> > -When this option is specified, the behavior is as if a special
> > -'<token>=<value>' argument were added at the beginning of the command
> > -line, where <value> is taken to be the standard output of the
> > -specified command with any leading and trailing whitespace trimmed
> > -off.
> > +When this option is specified, the first occurrence of substring $ARG is
> > +replaced with the value given to the `interpret-trailer` command for the
> > +same token. This option behaves in a similar way as ".cmd", however, it
> > +passes the value through $ARG.
>
> Maybe this last sentence could be replaced with "Otherwise this option
> behaves in the same way as 'trailer.<token>.cmd'."
>
> > -If the command contains the `$ARG` string, this string will be
> > -replaced with the <value> part of an existing trailer with the same
> > -<token>, if any, before the command is launched.
> > +".command" has been deprecated due to the $ARG in the user's command can
>
> s/".command"/The 'trailer.<token>.command' option/
> s/to the $ARG/to the fact that `$ARG`/
>
> > +only be replaced once and the original way of replacing $ARG was not safe.
>
> s/only be/can only be/
> s/and the/and that the/
>
> > +Now the preferred option is using "trailer.<token>.cmd", which use position
>
> s/using//
> s/use/uses/
> s/position/a positional/
>
> Also please make sure that trailer.<token>.cmd and
> trailer.<token>.command are always quoted in the same way. I think
> single quotes are used in the current doc, so please keep using single
> quotes.
>
> > +argument to pass the value.
> > ++
> > +When both .cmd and .command are given for the same <token>,
> > +.cmd is used and .command is ignored.
>
> Please spell and quote ".cmd" and ".command" consistently, so for
> example like: 'trailer.<token>.cmd'
>

OK.

> > +trailer.<token>.cmd::
> > +       The command specified by this configuration variable is run
> > +       with a single argument, which is the <value> part of a
> > +       `--trailer <token>=<value>` on the command line. The output
> > +       from the command is then used as the value for the <token>
> > +       in the resulting trailer.
> > ++
> > +When this option is specified, the behavior is as if a '<token>=<value>'
>
> s/'<token>=<value>'/`--trailer <token>=<value>`/  (let's try to be as
> explicit as possible)
>
> > +argument were added at the beginning of the "git interpret-trailers"
>
> s/were/was/
>
> > +command, the command specified by this configuration variable will be
> > +called with an empty string as the argument.
> > +
> >  If some '<token>=<value>' arguments are also passed on the command
> > -line, when a 'trailer.<token>.command' is configured, the command will
> > -also be executed for each of these arguments. And the <value> part of
> > -these arguments, if any, will be used to replace the `$ARG` string in
> > -the command.
> > +line, when a 'trailer.<token>.cmd' is configured, the command is run
> > +once for each `--trailer <token>=<value>` on the command line with the
> > +same <token>. And the <value> part of these arguments, if any, will be
> > +passed to the command as its first argument.
>
> Yeah, it's much better than it was, but I think we can do better. I
> will try to come up with something soon.
>
> Also as I said above and in reply to Junio, I think it might be better
> to split this in 2 patches.
>
> >  EXAMPLES
> >  --------
> > @@ -333,6 +348,53 @@ subject
> >  Fix #42
> >  ------------
> >
> > +* Configure a 'cnt' trailer with a cmd use a global script `gcount`
> > +to record commit counts of a specified author and show how it works:
> > ++
> > +------------
> > +$ cat ~/bin/gcount
> > +#!/bin/sh
> > +test -n "$1" && git shortlog -s --author="$1" HEAD || true
> > +$ git config trailer.cnt.key "Commit-count: "
> > +$ git config trailer.cnt.ifExists "replace"
> > +$ git config trailer.cnt.cmd "~/bin/gcount"
> > +$ git interpret-trailers --trailer="cnt:Junio" <<EOF
> > +> subject
> > +>
> > +> message
> > +>
> > +> EOF
> > +subject
> > +
> > +message
> > +
> > +Commit-count: 22484     Junio C Hamano
> > +------------
> > +
> > +* Configure a 'ref' trailer with a cmd use a global script `glog-grep`
> > +  to grep last relevant commit from git log in the git repository
> > +  and show how it works:
> > ++
> > +------------
> > +$ cat ~/bin/glog-grep
> > +#!/bin/sh
> > +test -n "$1" && git log --grep "$1" --pretty=reference -1 || true
> > +$ git config trailer.ref.key "Reference-to: "
> > +$ git config trailer.ref.ifExists "replace"
> > +$ git config trailer.ref.cmd "~/bin/glog-grep"
> > +$ git interpret-trailers --trailer="ref:Add copyright notices." <<EOF
> > +> subject
> > +>
> > +> message
> > +>
> > +> EOF
> > +subject
> > +
> > +message
> > +
> > +Reference-to: 8bc9a0c769 (Add copyright notices., 2005-04-07)
>
> The added examples look good!
>

Thanks.

> > +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
> > +       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
> > +'
>
> I guess this shows that the command is called multiple times, the
> first time with an empty first arg.
>
> > +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 "replace" &&
> > +       git config trailer.bug.cmd "echo \"\$1\" is" &&
> > +       cat >expected2 <<-EOF &&
> > +
> > +       Bug-maker: me is me
> > +       EOF
> > +       git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
> > +               >actual2 &&
> > +       test_cmp expected2 actual2
> > +'
>
> I guess this shows that the argument is also available as "$1".
>
> > +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
> > +'
>
> Ok, this shows how `sh -c ...` can be used in ".cmd".
>
> > +test_expect_success 'with cmd and $1 with shell script' '
> > +       test_when_finished "git config --remove-section trailer.bug" &&
> > +       git config trailer.bug.key "Bug-maker: " &&
> > +       git config trailer.bug.ifExists "replace" &&
> > +       git config trailer.bug.cmd "./echoscript" &&
> > +       cat >expected2 <<-EOF &&
> > +
> > +       Bug-maker: who is me
> > +       EOF
> > +       cat >echoscript <<-EOF &&
> > +       #!/bin/sh
> > +       echo who is "\$1"
> > +       EOF
> > +       chmod +x echoscript &&
> > +       git interpret-trailers --trailer "bug: him" --trailer "bug:me" \
> > +               >actual2 &&
> > +       test_cmp expected2 actual2
> > +'
>
> Ok.
>
> >  test_expect_success 'without config' '
> >         sed -e "s/ Z\$/ /" >expected <<-\EOF &&
> >
> > @@ -1274,9 +1337,31 @@ test_expect_success 'setup a commit' '
> >         git commit -m "Add file a.txt"
> >  '
> >
> > +test_expect_success 'cmd takes precedence over command' '
> > +       test_when_finished "git config --unset trailer.fix.cmd" &&
> > +       git config trailer.fix.ifExists "replace" &&
> > +       git config trailer.fix.cmd "test -n \"\$1\" && git log -1 --oneline --format=\"%h (%aN)\" \
> > +               --abbrev-commit --abbrev=14 \"\$1\" || true" &&
> > +       git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" \
> > +               --abbrev-commit --abbrev=14 \$ARG" &&
> > +       FIXED=$(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
> > +'
>
> Ok.
>
> >  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" &&
> > +       git config trailer.fix.command "git log -1 --oneline --format=\"%h (%s)\" \
> > +               --abbrev-commit --abbrev=14 \$ARG" &&
>
> This is just an indent change. I am not sure it's worth doing in this
> patch. If you think that the file needs better indentation though,
> then you might do it in a separate preparatory patch at the beginning
> of the current patch series.
>
> If there is only this place in the file where such an indentation
> improvement is needed, this might be ok, but please mention in the
> commit message that while at it you are also doing this small change.
>

Well, I may often think that these small changes are irrelevant.
Since you said that, I will cancel the modification of this place.

> The other parts of the patch look good to me.

Thanks, Christian.
--
ZheNing Hu

  reply index

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 14:53 [PATCH] [GSOC]trailer: change $ARG to environment variable ZheNing Hu via GitGitGadget
2021-03-24 15:42 ` [PATCH v2] [GSOC]trailer: pass arg as positional parameter ZheNing Hu via GitGitGadget
2021-03-24 20:18   ` Junio C Hamano
2021-03-25  1:43     ` ZheNing Hu
2021-03-25 11:53   ` [PATCH v3] " ZheNing Hu via GitGitGadget
2021-03-25 22:28     ` Junio C Hamano
2021-03-26 13:29       ` ZheNing Hu
2021-03-26 16:13     ` [PATCH v4] " ZheNing Hu via GitGitGadget
2021-03-27 18:04       ` Junio C Hamano
2021-03-27 19:53         ` Christian Couder
2021-03-28 10:46           ` ZheNing Hu
2021-03-29  9:04             ` Christian Couder
2021-03-29 13:43               ` ZheNing Hu
2021-03-30  8:45                 ` Christian Couder
2021-03-30 11:22                   ` ZheNing Hu
2021-03-30 15:07                     ` ZheNing Hu
2021-03-30 17:14                       ` Junio C Hamano
2021-03-31  5:14                         ` ZheNing Hu
2021-03-31 18:19                           ` Junio C Hamano
2021-03-31 18:29                             ` Junio C Hamano
2021-04-01  3:56                               ` ZheNing Hu
2021-04-01 19:49                                 ` Junio C Hamano
2021-04-02  2:08                                   ` ZheNing Hu
2021-04-01  3:39                             ` ZheNing Hu
2021-03-31 10:05       ` [PATCH v5 0/2] " ZheNing Hu via GitGitGadget
2021-03-31 10:05         ` [PATCH v5 1/2] [GSOC] run-command: add shell_no_implicit_args option ZheNing Hu via GitGitGadget
2021-04-01  7:22           ` Christian Couder
2021-04-01  9:58             ` ZheNing Hu
2021-03-31 10:05         ` [PATCH v5 2/2] [GSOC]trailer: pass arg as positional parameter ZheNing Hu via GitGitGadget
2021-04-01  7:28         ` [PATCH v5 0/2] " Christian Couder
2021-04-01 10:02           ` ZheNing Hu
2021-04-02 13:26         ` [PATCH v6] [GSOC] trailer: add new trailer.<token>.cmd config option ZheNing Hu via GitGitGadget
2021-04-02 20:48           ` Junio C Hamano
2021-04-03  5:08             ` ZheNing Hu
2021-04-04  5:34               ` Junio C Hamano
2021-04-03  5:51             ` Christian Couder
2021-04-04 23:26               ` Junio C Hamano
2021-04-06  3:47                 ` Christian Couder
2021-04-06  3:52                   ` Christian Couder
2021-04-06  5:16                     ` ZheNing Hu
2021-04-06  5:34                       ` Junio C Hamano
2021-04-06  5:37                       ` Junio C Hamano
2021-04-04  5:43             ` ZheNing Hu
2021-04-04  8:52               ` Christian Couder
2021-04-04  9:53                 ` ZheNing Hu
2021-04-02 23:44           ` Junio C Hamano
2021-04-03  3:22             ` ZheNing Hu
2021-04-03  4:31               ` Junio C Hamano
2021-04-03  5:15                 ` ZheNing Hu
2021-04-04 13:11           ` [PATCH v7] " ZheNing Hu via GitGitGadget
2021-04-06 16:23             ` Christian Couder
2021-04-07  4:51               ` ZheNing Hu [this message]
2021-04-09 13:37             ` [PATCH v8 0/2] [GSOC] trailer: add new .cmd " ZheNing Hu via GitGitGadget
2021-04-09 13:37               ` [PATCH v8 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-09 19:02                 ` Christian Couder
2021-04-10 13:40                   ` ZheNing Hu
2021-04-09 13:37               ` [PATCH v8 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-09 20:18                 ` Christian Couder
2021-04-10 14:09                   ` ZheNing Hu
2021-04-09 19:59               ` [PATCH v8 0/2] " Christian Couder
2021-04-12 16:39               ` [PATCH v9 " ZheNing Hu via GitGitGadget
2021-04-12 16:39                 ` [PATCH v9 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-12 20:42                   ` Junio C Hamano
2021-04-16 12:03                     ` Christian Couder
2021-04-17  1:54                       ` Junio C Hamano
2021-04-12 16:39                 ` [PATCH v9 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-12 20:51                   ` Junio C Hamano
2021-04-13  7:33                     ` Christian Couder
2021-04-13 12:02                       ` ZheNing Hu
2021-04-13 19:18                         ` Junio C Hamano
2021-04-14 13:27                           ` ZheNing Hu
2021-04-14 20:33                             ` Junio C Hamano
2021-04-15 15:32                               ` ZheNing Hu
2021-04-15 17:41                                 ` Junio C Hamano
2021-04-16 12:54                               ` Christian Couder
2021-04-13 18:14                       ` Junio C Hamano
2021-04-16  8:47                 ` [PATCH v10 0/2] " ZheNing Hu via GitGitGadget
2021-04-16  8:47                   ` [PATCH v10 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-04-16 19:11                     ` Junio C Hamano
2021-04-16  8:47                   ` [PATCH v10 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-16 19:13                     ` Junio C Hamano
2021-04-16 19:21                     ` Junio C Hamano
2021-04-16 19:25                       ` Junio C Hamano
2021-04-17  2:58                         ` Junio C Hamano
2021-04-17  3:36                           ` Junio C Hamano
2021-04-17  7:41                             ` ZheNing Hu
2021-04-17  8:11                               ` Junio C Hamano
2021-04-17 15:13                   ` [PATCH v11 0/2] " ZheNing Hu via GitGitGadget
2021-04-17 15:13                     ` [PATCH v11 1/2] [GSOC] docs: correct description of .command ZheNing Hu via GitGitGadget
2021-04-17 15:13                     ` [PATCH v11 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget
2021-04-17 22:26                     ` [PATCH v11 0/2] " Junio C Hamano
2021-04-18  7:47                       ` ZheNing Hu
2021-04-21  0:09                         ` Junio C Hamano
2021-04-21  5:47                           ` ZheNing Hu
2021-04-21 23:40                             ` Junio C Hamano
2021-04-22  9:20                               ` ZheNing Hu
2021-04-27  6:49                                 ` Junio C Hamano
2021-04-27 12:24                                   ` ZheNing Hu
2021-05-03 15:41                     ` [PATCH v12 " ZheNing Hu via GitGitGadget
2021-05-03 15:41                       ` [PATCH v12 1/2] [GSOC] docs: correct descript of trailer.<token>.command ZheNing Hu via GitGitGadget
2021-05-03 15:41                       ` [PATCH v12 2/2] [GSOC] trailer: add new .cmd config option ZheNing Hu via GitGitGadget

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