From: "Miriam R." <mirucam@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: git <git@vger.kernel.org>
Subject: Re: [PATCH 12/29] bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell functions in C
Date: Fri, 31 Jan 2020 11:53:30 +0100 [thread overview]
Message-ID: <CAN7CjDCX6ohY4HHGe2EOFWf-U8wpM=xxRsPG8N7z4RjiQT0Qzg@mail.gmail.com> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.2001301619340.46@tvgsbejvaqbjf.bet>
Hi,
El jue., 30 ene. 2020 a las 23:47, Johannes Schindelin
(<Johannes.Schindelin@gmx.de>) escribió:
>
> Hi Miriam,
>
> I started looking at this patch, and will just send the comments, but
> please note that I would not mind at all leaving the review for later,
> when the libifying patches that you kept in v2 (and probably will send out
> a v3 for) made it into `next` and you send the remainder as a new patch
> series.
Yes, sure. Thank you, Johannes.
>
> On Mon, 20 Jan 2020, Miriam Rubio wrote:
>
> > From: Pranit Bauva <pranit.bauva@gmail.com>
> >
> > Reimplement the `bisect_next()` and the `bisect_auto_next()` shell functions
> > in C and add the subcommands to `git bisect--helper` to call them from
> > git-bisect.sh .
> >
> > Using `--bisect-next` and `--bisect-auto-start` subcommands is a
> > temporary measure to port shell function to C so as to use the existing
> > test suite. As more functions are ported, `--bisect-auto-start`
> > subcommand will be retired and will be called by some other methods.
>
> This still sounds clear enough.
>
> > Mentored-by: Lars Schneider <larsxschneider@gmail.com>
> > Mentored-by: Christian Couder <chriscool@tuxfamily.org>
> > Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> > Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
> > Signed-off-by: Tanushree Tumane <tanushreetumane@gmail.com>
> > Signed-off-by: Miriam Rubio <mirucam@gmail.com>
> > ---
> > bisect.c | 10 +++
> > builtin/bisect--helper.c | 174 ++++++++++++++++++++++++++++++++++++++-
> > git-bisect.sh | 47 ++---------
> > 3 files changed, 188 insertions(+), 43 deletions(-)
> >
> > diff --git a/bisect.c b/bisect.c
> > index 33f2829c19..1c13da8a28 100644
> > --- a/bisect.c
> > +++ b/bisect.c
> > @@ -635,6 +635,12 @@ static void bisect_rev_setup(struct repository *r, struct rev_info *revs,
> > struct argv_array rev_argv = ARGV_ARRAY_INIT;
> > int i;
> >
> > + /*
> > + * Since the code is slowly being converted to C, there might be
> > + * instances where the revisions were initialized before. Thus
> > + * we first need to reset it.
> > + */
>
> This comment sounds good right now, but is prone to get stale rather
> quickly.
>
> But that's actually remedied rather easily: if the comment is reworded
> only slightly, to avoid talking about the conversion process, and to
> mention instead that `revs` could have been used before, then we're
> golden.
Ok
>
> > + reset_revision_walk();
> > repo_init_revisions(r, revs, prefix);
> > revs->abbrev = 0;
> > revs->commit_format = CMIT_FMT_UNSPECIFIED;
> > @@ -971,6 +977,10 @@ void read_bisect_terms(const char **read_bad, const char **read_good)
> > * finished successfully.
> > * In this case the calling function or command should not turn a -10
> > * return code into an error or a non zero exit code.
>
> I'd like to have an empty line here (well, a line that only contains an
> indented `*`).
Noted.
>
> > + * This returned -10 is checked in bisect_helper::bisect_next() and
> > + * eventually transformed to 0 at the end of
> > + * bisect_helper::cmd_bisect__helper().
>
> This says _what_ it does. But not why. I would contend that it is much
> more important to know what role the `-10` serves than explaining where
> the role is acted out.
Aha.
>
> > + *
> > * If no_checkout is non-zero, the bisection process does not
> > * checkout the trial commit but instead simply updates BISECT_HEAD.
> > */
> > diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
> > index 5e0f759d50..29bbc1573b 100644
> > --- a/builtin/bisect--helper.c
> > +++ b/builtin/bisect--helper.c
> > @@ -8,6 +8,7 @@
> > #include "run-command.h"
> > #include "prompt.h"
> > #include "quote.h"
> > +#include "revision.h"
> >
> > static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
> > static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
> > @@ -29,6 +30,8 @@ static const char * const git_bisect_helper_usage[] = {
> > N_("git bisect--helper --bisect-terms [--term-good | --term-old | --term-bad | --term-new]"),
> > N_("git bisect--helper --bisect-start [--term-{old,good}=<term> --term-{new,bad}=<term>]"
> > "[--no-checkout] [<bad> [<good>...]] [--] [<paths>...]"),
> > + N_("git bisect--helper --bisect-next"),
> > + N_("git bisect--helper --bisect-auto-next"),
> > NULL
> > };
> >
> > @@ -421,6 +424,157 @@ static int bisect_append_log_quoted(const char **argv)
> > return res;
> > }
> >
> > +static int register_good_ref(const char *refname,
> > + const struct object_id *oid, int flags,
> > + void *cb_data)
> > +{
> > + struct string_list *good_refs = cb_data;
> > + string_list_append(good_refs, oid_to_hex(oid));
> > + return 0;
> > +}
> > +
> > +static void prepare_rev_argv(struct bisect_terms *terms, struct argv_array *rev_argv)
> > +{
> > + struct string_list good_revs = STRING_LIST_INIT_DUP;
> > + char *term_good = xstrfmt("%s-*", terms->term_good);
> > +
> > + for_each_glob_ref_in(register_good_ref, term_good,
> > + "refs/bisect/", &good_revs);
> > +
> > + argv_array_pushl(rev_argv, "skipped_commits", "refs/bisect/bad", "--not", NULL);
> > + for (int i = 0; i < good_revs.nr; i++)
> > + argv_array_push(rev_argv, good_revs.items[i].string);
> > +
> > + string_list_clear(&good_revs, 0);
> > + free(term_good);
> > +}
>
> Maybe we should fold that into `prepare_revs()`? We could then render the
> arguments directly into `revs` (via `add_pending_object()`, after setting
> obj->flags |= UNINTERESTING`) rather than formatting them into a string
> list, then deep-copy them into an `argv_array` only to parse them back
> into OIDs that we already had in the first place.
>
> > +
> > +static int prepare_revs(struct bisect_terms *terms, struct rev_info *revs)
> > +{
> > + int res = 0;
> > + struct argv_array rev_argv = ARGV_ARRAY_INIT;
> > +
> > + prepare_rev_argv(terms, &rev_argv);
> > +
> > + /*
> > + * It is important to reset the flags used by revision walks
> > + * as the previous call to bisect_next_all() in turn
> > + * setups a revision walk.
> > + */
> > + reset_revision_walk();
> > + init_revisions(revs, NULL);
> > + rev_argv.argc = setup_revisions(rev_argv.argc, rev_argv.argv, revs, NULL);
> > + if (prepare_revision_walk(revs))
> > + res = error(_("revision walk setup failed\n"));
> > +
> > + argv_array_clear(&rev_argv);
> > + return res;
> > +}
> > +
> > +static int process_skipped_commits(FILE *fp, struct bisect_terms *terms, struct rev_info *revs)
> > +{
> > + struct commit *commit;
> > + struct pretty_print_context pp = {0};
> > +
> > + if (fprintf(fp, "# only skipped commits left to test\n") < 1)
> > + return -1;
> > +
> > + while ((commit = get_revision(revs)) != NULL) {
> > + struct strbuf commit_name = STRBUF_INIT;
> > + format_commit_message(commit, "%s",
> > + &commit_name, &pp);
> > + fprintf(fp, "# possible first %s commit: [%s] %s\n",
> > + terms->term_bad, oid_to_hex(&commit->object.oid),
> > + commit_name.buf);
> > + strbuf_release(&commit_name);
> > + }
>
> In the interest of allowing further revision walks, we will probably need
> to re-set the flags via `clear_commit_marks()`, just like
> `check_ancestors()` does.
>
> > +
> > + return 0;
> > +}
> > +
> > +static int bisect_skipped_commits(struct bisect_terms *terms)
> > +{
> > + int res = 0;
> > + FILE *fp = NULL;
> > + struct rev_info revs;
> > +
> > + fp = fopen(git_path_bisect_log(), "a");
> > + if (!fp)
> > + return error_errno(_("could not open '%s' for appending"),
> > + git_path_bisect_log());
> > +
> > + res = prepare_revs(terms, &revs);
> > +
> > + if (!res)
> > + res = process_skipped_commits(fp, terms, &revs);
> > +
> > + fclose(fp);
> > + return res;
> > +}
>
> This is again a very short wrapper around another function, so it will
> probably make sense to merge the two, otherwise the boilerplate might very
> well outweigh the actual code doing actual work.
>
> > +
> > +static int bisect_successful(struct bisect_terms *terms)
> > +{
> > + FILE *fp = NULL;
> > + struct object_id oid;
> > + struct commit *commit;
> > + struct pretty_print_context pp = {0};
> > + struct strbuf commit_name = STRBUF_INIT;
> > + char *bad_ref = xstrfmt("refs/bisect/%s",
> > + terms->term_bad);
> > + int res = 0;
> > +
> > + read_ref(bad_ref, &oid);
> > + printf("%s\n", bad_ref);
> > + commit = lookup_commit_reference(the_repository, &oid);
> > + format_commit_message(commit, "%s", &commit_name, &pp);
> > +
>
> There is a trailing tab here. Maybe it would make sense to check the
> patches via `git log --check`?
These extra trailing tabs are removed in my working branch :)
This is my last branch:
https://gitlab.com/mirucam/git/commits/git-bisect-work3.3.1.
>
> > + fp = fopen(git_path_bisect_log(), "a");
> > + if (fp) {
> > + if (fprintf(fp, "# first %s commit: [%s] %s\n",
> > + terms->term_bad, oid_to_hex(&oid),
> > + commit_name.buf) < 1)
> > + res = -1;
>
> This would probably do with an error message, i.e. `res =
> error_errno(...);`
>
> > + fclose(fp);
> > + } else {
> > + res = error_errno(_("could not open '%s' for "
> > + "appending"),
> > + git_path_bisect_log());
> > + }
>
> This pattern of opening a file, writing something into it, and then return
> success, otherwise failure, seems like a repeated pattern. In other words,
> it would be a good candidate for factoring out into its own function.
>
> > + strbuf_release(&commit_name);
> > + free(bad_ref);
> > + return res;
> > +}
> > +
> > +static int bisect_next(struct bisect_terms *terms, const char *prefix)
> > +{
> > + int res, no_checkout;
> > +
> > + if (bisect_next_check(terms, terms->term_good))
> > + return -1;
> > +
> > + no_checkout = !is_empty_or_missing_file(git_path_bisect_head());
> > +
> > + /* Perform all bisection computation, display and checkout */
> > + res = bisect_next_all(the_repository, prefix, no_checkout);
> > +
> > + if (res == -10) {
> > + res = bisect_successful(terms);
> > + return res ? res : -11;
> > + } else if (res == -2) {
> > + res = bisect_skipped_commits(terms);
> > + return res ? res : -2;
> > + }
>
> I know exactly what I'll think if I see those constants six months from
> now, when I forgot most of the details of our conversation over here. A
> -10 means.. wait, what?
>
> Seriously, it is quite bad to keep those constants unexplained.
>
> In contrast, look at this here code:
>
> enum scld_error {
> SCLD_OK = 0,
> SCLD_FAILED = -1,
> SCLD_PERMS = -2,
> SCLD_EXISTS = -3,
> SCLD_VANISHED = -4
> };
> enum scld_error safe_create_leading_directories(char *path);
>
> What do you think? Will any reader stumble over this and say "what the
> heck is going on? What are these return values even _supposed_ to mean?"?
>
> Even better, it seems as if modern debuggers can figure out that a value
> -4 returned from `safe_create_leading_directories()` actually mean
> `SCLD_VANISHED` and display that to the user.
>
> So armed with this example, you could of course go back to your mentor and
> ask for permission to change the bisect code accordingly.
>
> You could also just decide on your own that this is what you want to do
> because it is so much more elegant, anyway.
>
> > + return res;
> > +}
> > +
> > +static int bisect_auto_next(struct bisect_terms *terms, const char *prefix)
> > +{
> > + if (!bisect_next_check(terms, NULL))
> > + return bisect_next(terms, prefix);
> > +
> > + return 0;
>
> A common pattern in Git's source code is to present the early return
> first, i.e.
>
> if (bisect_next_check(terms, NULL))
> return 0;
>
> return bisect_next(terms, prefix);
>
> I do find it easier to read that way, too.
>
> > +
> > static int bisect_start(struct bisect_terms *terms, int no_checkout,
> > const char **argv, int argc)
> > {
> > @@ -625,7 +779,9 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
> > CHECK_AND_SET_TERMS,
> > BISECT_NEXT_CHECK,
> > BISECT_TERMS,
> > - BISECT_START
> > + BISECT_START,
> > + BISECT_NEXT,
> > + BISECT_AUTO_NEXT,
> > } cmdmode = 0;
> > int no_checkout = 0, res = 0, nolog = 0;
> > struct option options[] = {
> > @@ -649,6 +805,10 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
> > N_("print out the bisect terms"), BISECT_TERMS),
> > OPT_CMDMODE(0, "bisect-start", &cmdmode,
> > N_("start the bisect session"), BISECT_START),
> > + OPT_CMDMODE(0, "bisect-next", &cmdmode,
> > + N_("find the next bisection commit"), BISECT_NEXT),
> > + OPT_CMDMODE(0, "bisect-auto-next", &cmdmode,
> > + N_("verify the next bisection state then checkout the next bisection commit"), BISECT_AUTO_NEXT),
> > OPT_BOOL(0, "no-checkout", &no_checkout,
> > N_("update BISECT_HEAD instead of checking out the current commit")),
> > OPT_BOOL(0, "no-log", &nolog,
> > @@ -710,6 +870,18 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
> > set_terms(&terms, "bad", "good");
> > res = bisect_start(&terms, no_checkout, argv, argc);
> > break;
> > + case BISECT_NEXT:
> > + if (argc)
> > + return error(_("--bisect-next requires 0 arguments"));
> > + get_terms(&terms);
> > + res = bisect_next(&terms, prefix);
> > + break;
> > + case BISECT_AUTO_NEXT:
> > + if (argc)
> > + return error(_("--bisect-auto-next requires 0 arguments"));
> > + get_terms(&terms);
> > + res = bisect_auto_next(&terms, prefix);
> > + break;
> > default:
> > return error("BUG: unknown subcommand '%d'", cmdmode);
> > }
> > diff --git a/git-bisect.sh b/git-bisect.sh
> > index efee12b8b1..7531b74708 100755
> > --- a/git-bisect.sh
> > +++ b/git-bisect.sh
> > @@ -87,7 +87,7 @@ bisect_start() {
> > # Check if we can proceed to the next bisect state.
> > #
> > get_terms
> > - bisect_auto_next
> > + git bisect--helper --bisect-auto-next || exit
> >
> > trap '-' 0
> > }
> > @@ -140,45 +140,7 @@ bisect_state() {
> > *)
> > usage ;;
> > esac
> > - bisect_auto_next
> > -}
> > -
> > -bisect_auto_next() {
> > - git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD && bisect_next || :
> > -}
> > -
> > -bisect_next() {
> > - case "$#" in 0) ;; *) usage ;; esac
> > - bisect_autostart
> > - git bisect--helper --bisect-next-check $TERM_GOOD $TERM_BAD $TERM_GOOD|| exit
> > -
> > - # Perform all bisection computation, display and checkout
> > - git bisect--helper --next-all $(test -f "$GIT_DIR/BISECT_HEAD" && echo --no-checkout)
> > - res=$?
> > -
> > - # Check if we should exit because bisection is finished
> > - if test $res -eq 10
> > - then
> > - bad_rev=$(git show-ref --hash --verify refs/bisect/$TERM_BAD)
> > - bad_commit=$(git show-branch $bad_rev)
> > - echo "# first $TERM_BAD commit: $bad_commit" >>"$GIT_DIR/BISECT_LOG"
> > - exit 0
> > - elif test $res -eq 2
> > - then
> > - echo "# only skipped commits left to test" >>"$GIT_DIR/BISECT_LOG"
> > - good_revs=$(git for-each-ref --format="%(objectname)" "refs/bisect/$TERM_GOOD-*")
> > - for skipped in $(git rev-list refs/bisect/$TERM_BAD --not $good_revs)
> > - do
> > - skipped_commit=$(git show-branch $skipped)
> > - echo "# possible first $TERM_BAD commit: $skipped_commit" >>"$GIT_DIR/BISECT_LOG"
> > - done
> > - exit $res
> > - fi
> > -
> > - # Check for an error in the bisection process
> > - test $res -ne 0 && exit $res
> > -
> > - return 0
> > + git bisect--helper --bisect-auto-next
>
> Beautiful.
>
> > }
> >
> > bisect_visualize() {
> > @@ -232,7 +194,7 @@ bisect_replay () {
> > die "$(gettext "?? what are you talking about?")" ;;
> > esac
> > done <"$file"
> > - bisect_auto_next
> > + git bisect--helper --bisect-auto-next
> > }
> >
> > bisect_run () {
> > @@ -329,7 +291,8 @@ case "$#" in
> > bisect_skip "$@" ;;
> > next)
> > # Not sure we want "next" at the UI level anymore.
> > - bisect_next "$@" ;;
> > + get_terms
>
> I vaguely remember that we talked about this, or at least about a similar
> scenario. It needs to be explained in the commit message why we need to
> call `get_terms` here when previously, we did not.
>
> Of course, after thinking about this and looking around for a couple of
> minutes, I know why. My point is that I, or for that matter, any reader of
> this commit, should not need to repeat that analysis.
>
> Other than that, the patch looks good.
>
For the rest of your suggestions I haven't answered, I will wait to my
mentor opinion first. :)
Thank you.
> As I said, I will stop reviewing the remainder of this patch series, as it
> has been removed from v2 and will probably be presented as a follow-up
> patch series soon.
>
Yes, they will be sent as soon as the part1 is in `next`:).
Best,
Miriam
> Thanks,
> Dscho
>
> > + git bisect--helper --bisect-next "$@" || exit ;;
> > visualize|view)
> > bisect_visualize "$@" ;;
> > reset)
> > --
> > 2.21.1 (Apple Git-122.3)
> >
> >
next prev parent reply other threads:[~2020-01-31 10:53 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 14:37 [Outreachy][PATCH 00/29] Finish converting git bisect to C part 1 Miriam Rubio
2020-01-20 14:37 ` [PATCH 01/29] bisect--helper: convert `vocab_*` char pointers to char arrays Miriam Rubio
2020-01-20 14:37 ` [PATCH 02/29] bisect--helper: change `retval` to `res` Miriam Rubio
2020-01-20 14:37 ` [PATCH 03/29] bisect: use the standard 'if (!var)' way to check for 0 Miriam Rubio
2020-01-20 14:37 ` [PATCH 04/29] run-command: make `exists_in_PATH()` non-static Miriam Rubio
2020-01-20 14:37 ` [PATCH 05/29] bisect--helper: introduce new `decide_next()` function Miriam Rubio
2020-01-20 14:37 ` [PATCH 06/29] bisect: libify `exit_if_skipped_commits` to `error_if_skipped*` and its dependents Miriam Rubio
2020-01-20 21:57 ` Johannes Schindelin
2020-01-21 6:40 ` Christian Couder
2020-01-21 10:00 ` Miriam R.
2020-01-20 14:37 ` [PATCH 07/29] bisect: libify `bisect_checkout` Miriam Rubio
2020-01-20 14:37 ` [PATCH 08/29] bisect: libify `check_merge_bases` and its dependents Miriam Rubio
2020-01-20 22:09 ` Johannes Schindelin
2020-01-21 9:59 ` Miriam R.
2020-01-20 14:37 ` [PATCH 09/29] bisect: libify `check_good_are_ancestors_of_bad` " Miriam Rubio
2020-01-20 22:20 ` Johannes Schindelin
2020-01-21 6:59 ` Christian Couder
2020-01-21 10:00 ` Miriam R.
2020-01-20 14:37 ` [PATCH 10/29] bisect: libify `handle_bad_merge_base` " Miriam Rubio
2020-01-20 22:23 ` Johannes Schindelin
2020-01-21 7:05 ` Christian Couder
2020-01-21 10:00 ` Miriam R.
2020-01-20 14:37 ` [PATCH 11/29] bisect: libify `bisect_next_all` Miriam Rubio
2020-01-20 22:29 ` Johannes Schindelin
2020-01-21 7:15 ` Christian Couder
2020-01-30 15:18 ` Johannes Schindelin
2020-01-20 14:37 ` [PATCH 12/29] bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell functions in C Miriam Rubio
2020-01-30 22:47 ` Johannes Schindelin
2020-01-31 10:53 ` Miriam R. [this message]
2020-02-17 7:20 ` Christian Couder
2020-02-17 22:00 ` Johannes Schindelin
2020-01-20 14:37 ` [PATCH 13/29] bisect--helper: finish porting `bisect_start()` to C Miriam Rubio
2020-01-20 14:37 ` [PATCH 14/29] bisect--helper: retire `--bisect-clean-state` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 15/29] bisect--helper: retire `--next-all` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 16/29] bisect--helper: reimplement `bisect_autostart` shell function in C Miriam Rubio
2020-01-20 14:37 ` [PATCH 17/29] bisect--helper: reimplement `bisect_state` & `bisect_head` shell functions " Miriam Rubio
2020-01-20 14:37 ` [PATCH 18/29] bisect--helper: retire `--check-expected-revs` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 19/29] bisect--helper: retire `--write-terms` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 20/29] bisect--helper: reimplement `bisect_log` shell function in C Miriam Rubio
2020-01-20 14:37 ` [PATCH 21/29] bisect--helper: reimplement `bisect_replay` " Miriam Rubio
2020-01-20 14:37 ` [PATCH 22/29] bisect--helper: retire `--bisect-write` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 23/29] bisect--helper: use `res` instead of return in BISECT_RESET case option Miriam Rubio
2020-01-20 14:37 ` [PATCH 24/29] bisect--helper: retire `--bisect-autostart` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 25/29] bisect--helper: retire `--bisect-auto-next` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 26/29] bisect--helper: reimplement `bisect_skip` shell function in C Miriam Rubio
2020-01-20 14:37 ` [PATCH 27/29] bisect--helper: retire `--check-and-set-terms` subcommand Miriam Rubio
2020-01-20 14:37 ` [PATCH 28/29] bisect--helper: reimplement `bisect_visualize()`shell function in C Miriam Rubio
2020-01-20 14:38 ` [PATCH 29/29] bisect--helper: reimplement `bisect_run` shell " Miriam Rubio
2020-01-20 21:41 ` [Outreachy][PATCH 00/29] Finish converting git bisect to C part 1 Johannes Schindelin
2020-01-20 23:24 ` Christian Couder
2020-01-30 15:12 ` Johannes Schindelin
2020-01-30 21:12 ` Junio C Hamano
2020-01-21 8:44 ` Miriam R.
2020-01-30 15:13 ` Johannes Schindelin
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