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Merge branch 'jk/reflog-walk'

Browse source 
Numerous bugs in walking of reflogs via "log -g" and friends have
been fixed.

* jk/reflog-walk:
  reflog-walk: apply --since/--until to reflog dates
  reflog-walk: stop using fake parents
  rev-list: check reflog_info before showing usage
  get_revision_1(): replace do-while with an early return
  log: do not free parents when walking reflog
  log: clarify comment about reflog cycles
  revision: disallow reflog walking with revs->limited
  t1414: document some reflog-walk oddities
This commit is contained in:
Junio C Hamano 2017-08-11 13:27:00 -07:00
parent 51b8aecabe de239446b6
commit 3ab01ac3f7
8 changed files with 253 additions and 122 deletions
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9
builtin/log.c
View file

@ -372,11 +372,14 @@ static int cmd_log_walk(struct rev_info *rev)
*/
rev->max_count++;
if (!rev->reflog_info) {
/* we allow cycles in reflog ancestry */
/*
* We may show a given commit multiple times when
* walking the reflogs.
*/
free_commit_buffer(commit);
free_commit_list(commit->parents);
commit->parents = NULL;
}
free_commit_list(commit->parents);
commit->parents = NULL;
if (saved_nrl < rev->diffopt.needed_rename_limit)
saved_nrl = rev->diffopt.needed_rename_limit;
if (rev->diffopt.degraded_cc_to_c)

3
builtin/rev-list.c
View file

@ -11,6 +11,7 @@
#include "graph.h"
#include "bisect.h"
#include "progress.h"
#include "reflog-walk.h"
static const char rev_list_usage[] =
"git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
@ -349,7 +350,7 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
/* Only --header was specified */
revs.commit_format = CMIT_FMT_RAW;
if ((!revs.commits &&
if ((!revs.commits && reflog_walk_empty(revs.reflog_info) &&
(!(revs.tag_objects || revs.tree_objects || revs.blob_objects) &&
!revs.pending.nr)) ||
revs.diff)

151
reflog-walk.c
View file

@ -94,44 +94,6 @@ static int get_reflog_recno_by_time(struct complete_reflogs *array,
return -1;
}
struct commit_info_lifo {
struct commit_info {
struct commit *commit;
void *util;
} *items;
int nr, alloc;
};
static struct commit_info *get_commit_info(struct commit *commit,
struct commit_info_lifo *lifo, int pop)
{
int i;
for (i = 0; i < lifo->nr; i++)
if (lifo->items[i].commit == commit) {
struct commit_info *result = &lifo->items[i];
if (pop) {
if (i + 1 < lifo->nr)
MOVE_ARRAY(lifo->items + i,
lifo->items + i + 1,
lifo->nr - i);
lifo->nr--;
}
return result;
}
return NULL;
}
static void add_commit_info(struct commit *commit, void *util,
struct commit_info_lifo *lifo)
{
struct commit_info *info;
ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
info = lifo->items + lifo->nr;
info->commit = commit;
info->util = util;
lifo->nr++;
}
struct commit_reflog {
int recno;
enum selector_type {
@ -143,7 +105,8 @@ struct commit_reflog {
};
struct reflog_walk_info {
struct commit_info_lifo reflogs;
struct commit_reflog **logs;
size_t nr, alloc;
struct string_list complete_reflogs;
struct commit_reflog *last_commit_reflog;
};
@ -232,54 +195,12 @@ int add_reflog_for_walk(struct reflog_walk_info *info,
commit_reflog->selector = selector;
commit_reflog->reflogs = reflogs;
add_commit_info(commit, commit_reflog, &info->reflogs);
ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
info->logs[info->nr++] = commit_reflog;
return 0;
}
void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
{
struct commit_info *commit_info =
get_commit_info(commit, &info->reflogs, 0);
struct commit_reflog *commit_reflog;
struct object *logobj;
struct reflog_info *reflog;
info->last_commit_reflog = NULL;
if (!commit_info)
return;
commit_reflog = commit_info->util;
if (commit_reflog->recno < 0) {
commit->parents = NULL;
return;
}
info->last_commit_reflog = commit_reflog;
do {
reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
commit_reflog->recno--;
logobj = parse_object(&reflog->ooid);
} while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
if (!logobj && commit_reflog->recno >= 0 && is_null_oid(&reflog->ooid)) {
/* a root commit, but there are still more entries to show */
reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
logobj = parse_object(&reflog->noid);
if (!logobj)
logobj = parse_object(&reflog->ooid);
}
if (!logobj || logobj->type != OBJ_COMMIT) {
commit_info->commit = NULL;
commit->parents = NULL;
return;
}
commit_info->commit = (struct commit *)logobj;
commit->parents = xcalloc(1, sizeof(struct commit_list));
commit->parents->item = commit_info->commit;
}
void get_reflog_selector(struct strbuf *sb,
struct reflog_walk_info *reflog_info,
const struct date_mode *dmode, int force_date,
@ -343,6 +264,18 @@ const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
return info->email;
}
timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
{
struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
struct reflog_info *info;
if (!commit_reflog)
return 0;
info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
return info->timestamp;
}
void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
const struct date_mode *dmode, int force_date)
{
@ -364,3 +297,53 @@ void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
strbuf_release(&selector);
}
}
int reflog_walk_empty(struct reflog_walk_info *info)
{
return !info || !info->nr;
}
static struct commit *next_reflog_commit(struct commit_reflog *log)
{
for (; log->recno >= 0; log->recno--) {
struct reflog_info *entry = &log->reflogs->items[log->recno];
struct object *obj = parse_object(&entry->noid);
if (obj && obj->type == OBJ_COMMIT)
return (struct commit *)obj;
}
return NULL;
}
static timestamp_t log_timestamp(struct commit_reflog *log)
{
return log->reflogs->items[log->recno].timestamp;
}
struct commit *next_reflog_entry(struct reflog_walk_info *walk)
{
struct commit_reflog *best = NULL;
struct commit *best_commit = NULL;
size_t i;
for (i = 0; i < walk->nr; i++) {
struct commit_reflog *log = walk->logs[i];
struct commit *commit = next_reflog_commit(log);
if (!commit)
continue;
if (!best || log_timestamp(log) > log_timestamp(best)) {
best = log;
best_commit = commit;
}
}
if (best) {
best->recno--;
walk->last_commit_reflog = best;
return best_commit;
}
return NULL;
}

7
reflog-walk.h
View file

@ -8,16 +8,19 @@ struct reflog_walk_info;
extern void init_reflog_walk(struct reflog_walk_info **info);
extern int add_reflog_for_walk(struct reflog_walk_info *info,
struct commit *commit, const char *name);
extern void fake_reflog_parent(struct reflog_walk_info *info,
struct commit *commit);
extern void show_reflog_message(struct reflog_walk_info *info, int,
const struct date_mode *, int force_date);
extern void get_reflog_message(struct strbuf *sb,
struct reflog_walk_info *reflog_info);
extern const char *get_reflog_ident(struct reflog_walk_info *reflog_info);
extern timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info);
extern void get_reflog_selector(struct strbuf *sb,
struct reflog_walk_info *reflog_info,
const struct date_mode *dmode, int force_date,
int shorten);
extern int reflog_walk_empty(struct reflog_walk_info *walk);
struct commit *next_reflog_entry(struct reflog_walk_info *reflog_info);
#endif

57
revision.c
View file

@ -148,16 +148,14 @@ static void add_pending_object_with_path(struct rev_info *revs,
if (revs->reflog_info && obj->type == OBJ_COMMIT) {
struct strbuf buf = STRBUF_INIT;
int len = interpret_branch_name(name, 0, &buf, 0);
int st;
if (0 < len && name[len] && buf.len)
strbuf_addstr(&buf, name + len);
st = add_reflog_for_walk(revs->reflog_info,
(struct commit *)obj,
buf.buf[0] ? buf.buf: name);
add_reflog_for_walk(revs->reflog_info,
(struct commit *)obj,
buf.buf[0] ? buf.buf: name);
strbuf_release(&buf);
if (st)
return;
return; /* do not add the commit itself */
}
add_object_array_with_path(obj, name, &revs->pending, mode, path);
}
@ -2364,6 +2362,8 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
if (revs->reverse && revs->reflog_info)
die("cannot combine --reverse with --walk-reflogs");
if (revs->reflog_info && revs->limited)
die("cannot combine --walk-reflogs with history-limiting options");
if (revs->rewrite_parents && revs->children.name)
die("cannot combine --parents and --children");
@ -2963,6 +2963,18 @@ static inline int want_ancestry(const struct rev_info *revs)
return (revs->rewrite_parents || revs->children.name);
}
/*
* Return a timestamp to be used for --since/--until comparisons for this
* commit, based on the revision options.
*/
static timestamp_t comparison_date(const struct rev_info *revs,
struct commit *commit)
{
return revs->reflog_info ?
get_reflog_timestamp(revs->reflog_info) :
commit->date;
}
enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
{
if (commit->object.flags & SHOWN)
@ -2973,8 +2985,9 @@ enum commit_action get_commit_action(struct rev_info *revs, struct commit *commi
return commit_show;
if (commit->object.flags & UNINTERESTING)
return commit_ignore;
if (revs->min_age != -1 && (commit->date > revs->min_age))
return commit_ignore;
if (revs->min_age != -1 &&
comparison_date(revs, commit) > revs->min_age)
return commit_ignore;
if (revs->min_parents || (revs->max_parents >= 0)) {
int n = commit_list_count(commit->parents);
if ((n < revs->min_parents) ||
@ -3107,17 +3120,19 @@ static void track_linear(struct rev_info *revs, struct commit *commit)
static struct commit *get_revision_1(struct rev_info *revs)
{
if (!revs->commits)
return NULL;
while (1) {
struct commit *commit;
do {
struct commit *commit = pop_commit(&revs->commits);
if (revs->reflog_info)
commit = next_reflog_entry(revs->reflog_info);
else
commit = pop_commit(&revs->commits);
if (revs->reflog_info) {
save_parents(revs, commit);
fake_reflog_parent(revs->reflog_info, commit);
if (!commit)
return NULL;
if (revs->reflog_info)
commit->object.flags &= ~(ADDED | SEEN | SHOWN);
}
/*
* If we haven't done the list limiting, we need to look at
@ -3126,9 +3141,12 @@ static struct commit *get_revision_1(struct rev_info *revs)
*/
if (!revs->limited) {
if (revs->max_age != -1 &&
(commit->date < revs->max_age))
comparison_date(revs, commit) < revs->max_age)
continue;
if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
if (revs->reflog_info)
try_to_simplify_commit(revs, commit);
else if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
if (!revs->ignore_missing_links)
die("Failed to traverse parents of commit %s",
oid_to_hex(&commit->object.oid));
@ -3146,8 +3164,7 @@ static struct commit *get_revision_1(struct rev_info *revs)
track_linear(revs, commit);
return commit;
}
} while (revs->commits);
return NULL;
}
}
/*

10
t/t1411-reflog-show.sh
View file

@ -171,14 +171,4 @@ test_expect_success 'reflog exists works' '
! git reflog exists refs/heads/nonexistent
'
# The behavior with two reflogs is buggy and the output is in flux; for now
# we're just checking that the program works at all without segfaulting.
test_expect_success 'showing multiple reflogs works' '
git log -g HEAD HEAD >actual
'
test_expect_success 'showing multiple reflogs with an old date' '
git log -g HEAD@{1979-01-01} HEAD >actual
'
test_done

135
t/t1414-reflog-walk.sh Executable file
View file

@ -0,0 +1,135 @@
#!/bin/sh
test_description='various tests of reflog walk (log -g) behavior'
. ./test-lib.sh
test_expect_success 'set up some reflog entries' '
test_commit one &&
test_commit two &&
git checkout -b side HEAD^ &&
test_commit three &&
git merge --no-commit master &&
echo evil-merge-content >>one.t &&
test_tick &&
git commit --no-edit -a
'
do_walk () {
git log -g --format="%gd %gs" "$@"
}
sq="'"
test_expect_success 'set up expected reflog' '
cat >expect.all <<-EOF
HEAD@{0} commit (merge): Merge branch ${sq}master${sq} into side
HEAD@{1} commit: three
HEAD@{2} checkout: moving from master to side
HEAD@{3} commit: two
HEAD@{4} commit (initial): one
EOF
'
test_expect_success 'reflog walk shows expected logs' '
do_walk >actual &&
test_cmp expect.all actual
'
test_expect_success 'reflog can limit with --no-merges' '
grep -v merge expect.all >expect &&
do_walk --no-merges >actual &&
test_cmp expect actual
'
test_expect_success 'reflog can limit with pathspecs' '
grep two expect.all >expect &&
do_walk -- two.t >actual &&
test_cmp expect actual
'
test_expect_success 'pathspec limiting handles merges' '
# we pick up:
# - the initial commit of one
# - the checkout back to commit one
# - the evil merge which touched one
sed -n "1p;3p;5p" expect.all >expect &&
do_walk -- one.t >actual &&
test_cmp expect actual
'
test_expect_success '--parents shows true parents' '
# convert newlines to spaces
echo $(git rev-parse HEAD HEAD^1 HEAD^2) >expect &&
git rev-list -g --parents -1 HEAD >actual &&
test_cmp expect actual
'
test_expect_success 'walking multiple reflogs shows all' '
# We expect to see all entries for all reflogs, but interleaved by
# date, with order on the command line breaking ties. We
# can use "sort" on the separate lists to generate this,
# but note two tricks:
#
# 1. We use "{" as the delimiter, which lets us skip to the reflog
# date specifier as our second field, and then our "-n" numeric
# sort ignores the bits after the timestamp.
#
# 2. POSIX leaves undefined whether this is a stable sort or not. So
# we use "-k 1" to ensure that we see HEAD before master before
# side when breaking ties.
{
do_walk --date=unix HEAD &&
do_walk --date=unix side &&
do_walk --date=unix master
} >expect.raw &&
sort -t "{" -k 2nr -k 1 <expect.raw >expect &&
do_walk --date=unix HEAD master side >actual &&
test_cmp expect actual
'
test_expect_success 'date-limiting does not interfere with other logs' '
do_walk HEAD@{1979-01-01} HEAD >actual &&
test_cmp expect.all actual
'
test_expect_success 'min/max age uses entry date to limit' '
# Flip between commits one and two so each ref update actually
# does something (and does not get optimized out). We know
# that the timestamps of those commits will be before our "min".
git update-ref -m before refs/heads/minmax one &&
test_tick &&
min=$test_tick &&
git update-ref -m min refs/heads/minmax two &&
test_tick &&
max=$test_tick &&
git update-ref -m max refs/heads/minmax one &&
test_tick &&
git update-ref -m after refs/heads/minmax two &&
cat >expect <<-\EOF &&
max
min
EOF
git log -g --since=$min --until=$max --format=%gs minmax >actual &&
test_cmp expect actual
'
test_expect_success 'walk prefers reflog to ref tip' '
head=$(git rev-parse HEAD) &&
one=$(git rev-parse one) &&
ident="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE" &&
echo "$head $one $ident broken reflog entry" >>.git/logs/HEAD &&
echo $one >expect &&
git log -g --format=%H -1 >actual &&
test_cmp expect actual
'
test_expect_success 'rev-list -g complains when there are no reflogs' '
test_must_fail git rev-list -g
'
test_done

3
t/t3200-branch.sh
View file

@ -166,10 +166,9 @@ test_expect_success 'resulting reflog can be shown by log -g' '
oid=$(git rev-parse HEAD) &&
cat >expect <<-EOF &&
HEAD@{0} $oid $msg
HEAD@{1} $oid $msg
HEAD@{2} $oid checkout: moving from foo to baz
EOF
git log -g --format="%gd %H %gs" -3 HEAD >actual &&
git log -g --format="%gd %H %gs" -2 HEAD >actual &&
test_cmp expect actual
'