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bisect--helper: implement "git bisect--helper"

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This patch implements a new "git bisect--helper" builtin plumbing
command that will be used to migrate "git-bisect.sh" to C.

We start by implementing only the "--next-vars" option that will
read bisect refs from "refs/bisect/", and then compute the next
bisect step, and output shell variables ready to be eval'ed by
the shell.

At this step, "git bisect--helper" ignores the paths that may
have been put in "$GIT_DIR/BISECT_NAMES". This will be fixed in a
later patch.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder
2009-03-26 05:55:54 +01:00
committed by Junio C Hamano
parent 4eb5b64631
commit 1bf072e366
6 changed files with 105 additions and 0 deletions
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68
bisect.c
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@ -2,11 +2,18 @@
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "refs.h"
#include "list-objects.h"
#include "sha1-lookup.h"
#include "bisect.h"
static unsigned char (*skipped_sha1)[20];
static int skipped_sha1_nr;
static int skipped_sha1_alloc;
static const char **rev_argv;
static int rev_argv_nr;
static int rev_argv_alloc;
/* bits #0-15 in revision.h */
@ -390,6 +397,33 @@ struct commit_list *find_bisection(struct commit_list *list,
return best;
}
static int register_ref(const char *refname, const unsigned char *sha1,
int flags, void *cb_data)
{
if (!strcmp(refname, "bad")) {
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
rev_argv[rev_argv_nr++] = xstrdup(sha1_to_hex(sha1));
} else if (!prefixcmp(refname, "good-")) {
const char *hex = sha1_to_hex(sha1);
char *good = xmalloc(strlen(hex) + 2);
*good = '^';
memcpy(good + 1, hex, strlen(hex) + 1);
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
rev_argv[rev_argv_nr++] = good;
} else if (!prefixcmp(refname, "skip-")) {
ALLOC_GROW(skipped_sha1, skipped_sha1_nr + 1,
skipped_sha1_alloc);
hashcpy(skipped_sha1[skipped_sha1_nr++], sha1);
}
return 0;
}
static int read_bisect_refs(void)
{
return for_each_ref_in("refs/bisect/", register_ref, NULL);
}
static int skipcmp(const void *a, const void *b)
{
return hashcmp(a, b);
@ -444,3 +478,37 @@ struct commit_list *filter_skipped(struct commit_list *list,
return filtered;
}
int bisect_next_vars(const char *prefix)
{
struct rev_info revs;
int reaches = 0, all = 0;
init_revisions(&revs, prefix);
revs.abbrev = 0;
revs.commit_format = CMIT_FMT_UNSPECIFIED;
/* argv[0] will be ignored by setup_revisions */
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
rev_argv[rev_argv_nr++] = xstrdup("bisect_rev_setup");
if (read_bisect_refs())
die("reading bisect refs failed");
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
rev_argv[rev_argv_nr++] = xstrdup("--");
setup_revisions(rev_argv_nr, rev_argv, &revs, NULL);
revs.limited = 1;
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
if (revs.tree_objects)
mark_edges_uninteresting(revs.commits, &revs, NULL);
revs.commits = find_bisection(revs.commits, &reaches, &all,
!!skipped_sha1_nr);
return show_bisect_vars(&revs, reaches, all, 0, 1);
}