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bisect--helper: bisect_write shell function in C

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Reimplement the `bisect_write` shell function in C and add a
`bisect-write` subcommand to `git bisect--helper` to call it from
git-bisect.sh

Using `--bisect-write` subcommand is a temporary measure to port shell
function in C so as to use the existing test suite. As more functions
are ported, this subcommand will be retired but its implementation will
be called by some other methods.

Note: bisect_write() uses two variables namely TERM_GOOD and TERM_BAD
from the global shell script thus we need to pass it to the subcommand
using the arguments. We then store them in a struct bisect_terms and
pass the memory address around functions.

Add a log_commit() helper function to write the contents of the commit message
header to a file which will be re-used in future parts of the code as
well.

Also introduce a function free_terms() to free the memory of `struct
bisect_terms` and set_terms() to set the values of members in `struct
bisect_terms`.

Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
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: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pranit Bauva 2019-01-02 07:38:32 -08:00 committed by Junio C Hamano
parent 5e82c3dd22
commit 0f30233a11
2 changed files with 106 additions and 24 deletions
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105
builtin/bisect--helper.c
View file

@ -12,15 +12,37 @@ static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
static GIT_PATH_FUNC(git_path_bisect_ancestors_ok, "BISECT_ANCESTORS_OK")
static GIT_PATH_FUNC(git_path_bisect_start, "BISECT_START")
static GIT_PATH_FUNC(git_path_bisect_head, "BISECT_HEAD")
static GIT_PATH_FUNC(git_path_bisect_log, "BISECT_LOG")
static const char * const git_bisect_helper_usage[] = {
N_("git bisect--helper --next-all [--no-checkout]"),
N_("git bisect--helper --write-terms <bad_term> <good_term>"),
N_("git bisect--helper --bisect-clean-state"),
N_("git bisect--helper --bisect-reset [<commit>]"),
N_("git bisect--helper --bisect-write [--no-log] <state> <revision> <good_term> <bad_term>"),
NULL
};
struct bisect_terms {
char *term_good;
char *term_bad;
};
static void free_terms(struct bisect_terms *terms)
{
FREE_AND_NULL(terms->term_good);
FREE_AND_NULL(terms->term_bad);
}
static void set_terms(struct bisect_terms *terms, const char *bad,
const char *good)
{
free((void *)terms->term_good);
terms->term_good = xstrdup(good);
free((void *)terms->term_bad);
terms->term_bad = xstrdup(bad);
}
/*
* Check whether the string `term` belongs to the set of strings
* included in the variable arguments.
@ -148,6 +170,70 @@ static int bisect_reset(const char *commit)
return bisect_clean_state();
}
static void log_commit(FILE *fp, char *fmt, const char *state,
struct commit *commit)
{
struct pretty_print_context pp = {0};
struct strbuf commit_msg = STRBUF_INIT;
char *label = xstrfmt(fmt, state);
format_commit_message(commit, "%s", &commit_msg, &pp);
fprintf(fp, "# %s: [%s] %s\n", label, oid_to_hex(&commit->object.oid),
commit_msg.buf);
strbuf_release(&commit_msg);
free(label);
}
static int bisect_write(const char *state, const char *rev,
const struct bisect_terms *terms, int nolog)
{
struct strbuf tag = STRBUF_INIT;
struct object_id oid;
struct commit *commit;
FILE *fp = NULL;
int retval = 0;
if (!strcmp(state, terms->term_bad)) {
strbuf_addf(&tag, "refs/bisect/%s", state);
} else if (one_of(state, terms->term_good, "skip", NULL)) {
strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
} else {
retval = error(_("Bad bisect_write argument: %s"), state);
goto finish;
}
if (get_oid(rev, &oid)) {
retval = error(_("couldn't get the oid of the rev '%s'"), rev);
goto finish;
}
if (update_ref(NULL, tag.buf, &oid, NULL, 0,
UPDATE_REFS_MSG_ON_ERR)) {
retval = -1;
goto finish;
}
fp = fopen(git_path_bisect_log(), "a");
if (!fp) {
retval = error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
goto finish;
}
commit = lookup_commit_reference(the_repository, &oid);
log_commit(fp, "%s", state, commit);
if (!nolog)
fprintf(fp, "git bisect %s %s\n", state, rev);
finish:
if (fp)
fclose(fp);
strbuf_release(&tag);
return retval;
}
int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
enum {
@ -155,9 +241,10 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
WRITE_TERMS,
BISECT_CLEAN_STATE,
CHECK_EXPECTED_REVS,
BISECT_RESET
BISECT_RESET,
BISECT_WRITE
} cmdmode = 0;
int no_checkout = 0;
int no_checkout = 0, res = 0, nolog = 0;
struct option options[] = {
OPT_CMDMODE(0, "next-all", &cmdmode,
N_("perform 'git bisect next'"), NEXT_ALL),
@ -169,10 +256,15 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
N_("check for expected revs"), CHECK_EXPECTED_REVS),
OPT_CMDMODE(0, "bisect-reset", &cmdmode,
N_("reset the bisection state"), BISECT_RESET),
OPT_CMDMODE(0, "bisect-write", &cmdmode,
N_("write out the bisection state in BISECT_LOG"), BISECT_WRITE),
OPT_BOOL(0, "no-checkout", &no_checkout,
N_("update BISECT_HEAD instead of checking out the current commit")),
OPT_BOOL(0, "no-log", &nolog,
N_("no log for BISECT_WRITE ")),
OPT_END()
};
struct bisect_terms terms = { .term_good = NULL, .term_bad = NULL };
argc = parse_options(argc, argv, prefix, options,
git_bisect_helper_usage, 0);
@ -198,8 +290,15 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
if (argc > 1)
return error(_("--bisect-reset requires either no argument or a commit"));
return !!bisect_reset(argc ? argv[0] : NULL);
case BISECT_WRITE:
if (argc != 4 && argc != 5)
return error(_("--bisect-write requires either 4 or 5 arguments"));
set_terms(&terms, argv[3], argv[2]);
res = bisect_write(argv[0], argv[1], &terms, nolog);
break;
default:
return error("BUG: unknown subcommand '%d'", cmdmode);
}
return 0;
free_terms(&terms);
return !!res;
}

25
git-bisect.sh
View file

@ -144,7 +144,7 @@ bisect_start() {
0) state=$TERM_BAD ; bad_seen=1 ;;
*) state=$TERM_GOOD ;;
esac
eval="$eval bisect_write '$state' '$rev' 'nolog' &&"
eval="$eval git bisect--helper --bisect-write '$state' '$rev' '$TERM_GOOD' '$TERM_BAD' 'nolog' &&"
done
#
# Verify HEAD.
@ -220,23 +220,6 @@ bisect_start() {
trap '-' 0
}
bisect_write() {
state="$1"
rev="$2"
nolog="$3"
case "$state" in
"$TERM_BAD")
tag="$state" ;;
"$TERM_GOOD"|skip)
tag="$state"-"$rev" ;;
*)
die "$(eval_gettext "Bad bisect_write argument: \$state")" ;;
esac
git update-ref "refs/bisect/$tag" "$rev" || exit
echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
test -n "$nolog" || echo "git bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
}
bisect_skip() {
all=''
for arg in "$@"
@ -263,7 +246,7 @@ bisect_state() {
bisected_head=$(bisect_head)
rev=$(git rev-parse --verify "$bisected_head") ||
die "$(eval_gettext "Bad rev input: \$bisected_head")"
bisect_write "$state" "$rev"
git bisect--helper --bisect-write "$state" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit
git bisect--helper --check-expected-revs "$rev" ;;
2,"$TERM_BAD"|*,"$TERM_GOOD"|*,skip)
shift
@ -276,7 +259,7 @@ bisect_state() {
done
for rev in $hash_list
do
bisect_write "$state" "$rev"
git bisect--helper --bisect-write "$state" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit
done
git bisect--helper --check-expected-revs $hash_list ;;
*,"$TERM_BAD")
@ -413,7 +396,7 @@ bisect_replay () {
cmd="bisect_start $rev"
eval "$cmd" ;;
"$TERM_GOOD"|"$TERM_BAD"|skip)
bisect_write "$command" "$rev" ;;
git bisect--helper --bisect-write "$command" "$rev" "$TERM_GOOD" "$TERM_BAD" || exit;;
terms)
bisect_terms $rev ;;
*)