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 and 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.
This patch also introduces new methods namely bisect_state_init() and bisect_terms_release() for easy memory management for the struct bisect_terms.
Mentored-by: Lars Schneider <larsxschneider@gmail.com>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
---
builtin/bisect--helper.c | 97 ++++++++++++++++++++++++++++++++++++++++++++----
git-bisect.sh | 25 ++-----------
2 files changed, 94 insertions(+), 28 deletions(-)
Show changes to 2 files +94 −28
builtin/bisect--helper.c, git-bisect.sh
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 88b5d0a..88a1df8 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -22,9 +22,27 @@ static const char * const git_bisect_helper_usage[] = {
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 <state> <revision> <TERM_GOOD> <TERM_BAD> [<nolog>]"),
NULL
};
+struct bisect_terms {
+ struct strbuf term_good;
+ struct strbuf term_bad;
+};
+
+static void bisect_terms_init(struct bisect_terms *terms)
+{
+ strbuf_init(&terms->term_good, 0);
+ strbuf_init(&terms->term_bad, 0);
+}
+
+static void bisect_terms_release(struct bisect_terms *terms)
+{
+ strbuf_release(&terms->term_good);
+ strbuf_release(&terms->term_bad);
+}
+
/*
* Check whether the string `term` belongs to the set of strings
* included in the variable arguments.
@@ -188,6 +206,52 @@ static int check_expected_revs(const char **revs, int rev_nr)
return 0;
}
+static int bisect_write(const char *state, const char *rev,
+ const struct bisect_terms *terms, int nolog)
+{
+ struct strbuf tag = STRBUF_INIT;
+ struct strbuf commit_name = STRBUF_INIT;
+ struct object_id oid;
+ struct commit *commit;
+ struct pretty_print_context pp = {0};
+ FILE *fp;
+
+ if (!strcmp(state, terms->term_bad.buf))
+ strbuf_addf(&tag, "refs/bisect/%s", state);
+ else if(one_of(state, terms->term_good.buf, "skip", NULL))
+ strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
+ else
+ return error(_("Bad bisect_write argument: %s"), state);
+
+ if (get_oid(rev, &oid)) {
+ strbuf_release(&tag);
+ return error(_("couldn't get the oid of the rev '%s'"), rev);
+ }
+
+ if (update_ref(NULL, tag.buf, oid.hash, NULL, 0,
+ UPDATE_REFS_MSG_ON_ERR)) {
+ strbuf_release(&tag);
+ return -1;
+ }
+ strbuf_release(&tag);
+
+ fp = fopen(git_path_bisect_log(), "a");
+ if (!fp)
+ return error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
+
+ commit = lookup_commit_reference(oid.hash);
+ format_commit_message(commit, "%s", &commit_name, &pp);
+ fprintf(fp, "# %s: [%s] %s\n", state, sha1_to_hex(oid.hash),
+ commit_name.buf);
+ strbuf_release(&commit_name);
+
+ if (!nolog)
+ fprintf(fp, "git bisect %s %s\n", state, rev);
+
+ fclose(fp);
+ return 0;
+}
+
int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
enum {
@@ -195,9 +259,10 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
WRITE_TERMS,
BISECT_CLEAN_STATE,
BISECT_RESET,
- CHECK_EXPECTED_REVS
+ CHECK_EXPECTED_REVS,
+ BISECT_WRITE
} cmdmode = 0;
- int no_checkout = 0;
+ int no_checkout = 0, res = 0;
struct option options[] = {
OPT_CMDMODE(0, "next-all", &cmdmode,
N_("perform 'git bisect next'"), NEXT_ALL),
@@ -209,10 +274,14 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
N_("reset the bisection state"), BISECT_RESET),
OPT_CMDMODE(0, "check-expected-revs", &cmdmode,
N_("check for expected revs"), CHECK_EXPECTED_REVS),
+ 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_END()
};
+ struct bisect_terms terms;
+ bisect_terms_init(&terms);
argc = parse_options(argc, argv, prefix, options,
git_bisect_helper_usage, 0);
@@ -221,24 +290,38 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
usage_with_options(git_bisect_helper_usage, options);
switch (cmdmode) {
+ int nolog;
case NEXT_ALL:
return bisect_next_all(prefix, no_checkout);
case WRITE_TERMS:
if (argc != 2)
die(_("--write-terms requires two arguments"));
- return write_terms(argv[0], argv[1]);
+ res = write_terms(argv[0], argv[1]);
+ break;
case BISECT_CLEAN_STATE:
if (argc != 0)
die(_("--bisect-clean-state requires no arguments"));
- return bisect_clean_state();
+ res = bisect_clean_state();
+ break;
case BISECT_RESET:
if (argc > 1)
die(_("--bisect-reset requires either zero or one arguments"));
- return bisect_reset(argc ? argv[0] : NULL);
+ res = bisect_reset(argc ? argv[0] : NULL);
+ break;
case CHECK_EXPECTED_REVS:
- return check_expected_revs(argv, argc);
+ res = check_expected_revs(argv, argc);
+ break;
+ case BISECT_WRITE:
+ if (argc != 4 && argc != 5)
+ die(_("--bisect-write requires either 4 or 5 arguments"));
+ nolog = (argc == 5) && !strcmp(argv[4], "nolog");
+ strbuf_addstr(&terms.term_good, argv[2]);
+ strbuf_addstr(&terms.term_bad, argv[3]);
+ res = bisect_write(argv[0], argv[1], &terms, nolog);
+ break;
default:
die("BUG: unknown subcommand '%d'", cmdmode);
}
- return 0;
+ bisect_terms_release(&terms);
+ return res;
}
diff --git a/git-bisect.sh b/git-bisect.sh
index 4f6545e..b9896a4 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -145,7 +145,7 @@ 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.
@@ -221,23 +221,6 @@ 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 "$@"
@@ -263,7 +246,7 @@ bisect_state() {
1,"$TERM_BAD"|1,"$TERM_GOOD"|1,skip)
rev=$(git rev-parse --verify $(bisect_head)) ||
die "$(gettext "Bad rev input: $(bisect_head)")"
- bisect_write "$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 ;;
*)
Pranit Bauva