We will always try to sort the "packed-refs" increasingly by comparing
the refname. So, we should add checks to verify whether the "packed-refs"
is sorted.
We already have code to parse the content. Let's create a new structure
"fsck_packed_ref_entry" to store the state during the parsing process
for every entry. It may seem that we could just add a new "struct strbuf
refname" into the "struct fsck_packed_ref_entry" and during the parsing
process, we could store the refname into this structure and we could
compare later. However, this is not a good design due to the following
reasons:
1. Because we need to store the state across the whole checking
lifetime, we would consume a lot of memory if there are many entries
in the "packed-refs" file.
2. The most important thing is that we cannot reuse the existing compare
functions which cause repetition.
So, instead of storing the "struct strbuf", let's use the existing
structure "struct snaphost_record". And thus we could use the existing
function "cmp_packed_ref_records".
However, this function need an extra parameter for "struct snaphost".
Extract the common part into a new function "cmp_packed_ref_records" to
reuse this function to compare.
Then, create a new function "packed_fsck_ref_sorted" to use the new fsck
message "packedRefUnsorted(ERROR)" to report to the user.
Mentored-by: Patrick Steinhardt <ps@xxxxxx>
Mentored-by: Karthik Nayak <karthik.188@xxxxxxxxx>
Signed-off-by: shejialuo <shejialuo@xxxxxxxxx>
---
Documentation/fsck-msgids.txt | 3 +
fsck.h | 1 +
refs/packed-backend.c | 100 +++++++++++++++++++++++++++++++---
t/t0602-reffiles-fsck.sh | 38 +++++++++++++
4 files changed, 135 insertions(+), 7 deletions(-)
diff --git a/Documentation/fsck-msgids.txt b/Documentation/fsck-msgids.txt
index 2a7ec7592e..7a11d35c5e 100644
--- a/Documentation/fsck-msgids.txt
+++ b/Documentation/fsck-msgids.txt
@@ -190,6 +190,9 @@
`packedRefMissingHeader`::
(INFO) The "packed-refs" file does not contain the header.
+`packedRefUnsorted`::
+ (ERROR) The "packed-refs" file is not sorted.
+
`refMissingNewline`::
(INFO) A loose ref that does not end with newline(LF). As
valid implementations of Git never created such a loose ref
diff --git a/fsck.h b/fsck.h
index 40126242a4..0d3d1045ae 100644
--- a/fsck.h
+++ b/fsck.h
@@ -56,6 +56,7 @@ enum fsck_msg_type {
FUNC(MISSING_TYPE_ENTRY, ERROR) \
FUNC(MULTIPLE_AUTHORS, ERROR) \
FUNC(PACKED_REF_ENTRY_NOT_TERMINATED, ERROR) \
+ FUNC(PACKED_REF_UNSORTED, ERROR) \
FUNC(TREE_NOT_SORTED, ERROR) \
FUNC(UNKNOWN_TYPE, ERROR) \
FUNC(ZERO_PADDED_DATE, ERROR) \
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 271c740728..b250f987b2 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -300,14 +300,9 @@ struct snapshot_record {
size_t len;
};
-static int cmp_packed_ref_records(const void *v1, const void *v2,
- void *cb_data)
-{
- const struct snapshot *snapshot = cb_data;
- const struct snapshot_record *e1 = v1, *e2 = v2;
- const char *r1 = e1->start + snapshot_hexsz(snapshot) + 1;
- const char *r2 = e2->start + snapshot_hexsz(snapshot) + 1;
+static int cmp_packed_refname(const char *r1, const char *r2)
+{
while (1) {
if (*r1 == '\n')
return *r2 == '\n' ? 0 : -1;
@@ -322,6 +317,17 @@ static int cmp_packed_ref_records(const void *v1, const void *v2,
}
}
+static int cmp_packed_ref_records(const void *v1, const void *v2,
+ void *cb_data)
+{
+ const struct snapshot *snapshot = cb_data;
+ const struct snapshot_record *e1 = v1, *e2 = v2;
+ const char *r1 = e1->start + snapshot_hexsz(snapshot) + 1;
+ const char *r2 = e2->start + snapshot_hexsz(snapshot) + 1;
+
+ return cmp_packed_refname(r1, r2);
+}
+
/*
* Compare a snapshot record at `rec` to the specified NUL-terminated
* refname.
@@ -1768,6 +1774,28 @@ static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_s
return empty_ref_iterator_begin();
}
+struct fsck_packed_ref_entry {
+ int line_number;
+
+ struct snapshot_record record;
+};
+
+static struct fsck_packed_ref_entry *create_fsck_packed_ref_entry(int line_number,
+ const char *start)
+{
+ struct fsck_packed_ref_entry *entry = xcalloc(1, sizeof(*entry));
+ entry->line_number = line_number;
+ entry->record.start = start;
+ return entry;
+}
+
+static void free_fsck_packed_ref_entries(struct fsck_packed_ref_entry **entries, int nr)
+{
+ for (int i = 0; i < nr; i++)
+ free(entries[i]);
+ free(entries);
+}
+
static int packed_fsck_ref_next_line(struct fsck_options *o,
struct strbuf *packed_entry, const char *start,
const char *eof, const char **eol)
@@ -1893,13 +1921,60 @@ static int packed_fsck_ref_main_line(struct fsck_options *o,
return 0;
}
+static int packed_fsck_ref_sorted(struct fsck_options *o,
+ struct ref_store *ref_store,
+ struct fsck_packed_ref_entry **entries,
+ int nr)
+{
+ size_t hexsz = ref_store->repo->hash_algo->hexsz;
+ struct strbuf packed_entry = STRBUF_INIT;
+ struct fsck_ref_report report = { 0 };
+ struct strbuf refname1 = STRBUF_INIT;
+ struct strbuf refname2 = STRBUF_INIT;
+ int ret = 0;
+
+ for (int i = 1; i < nr; i++) {
+ const char *r1 = entries[i - 1]->record.start + hexsz + 1;
+ const char *r2 = entries[i]->record.start + hexsz + 1;
+
+ if (cmp_packed_refname(r1, r2) >= 0) {
+ const char *err_fmt =
+ "refname '%s' is not less than next refname '%s'";
+ const char *eol;
+ eol = memchr(entries[i - 1]->record.start, '\n',
+ entries[i - 1]->record.len);
+ strbuf_add(&refname1, r1, eol - r1);
+ eol = memchr(entries[i]->record.start, '\n',
+ entries[i]->record.len);
+ strbuf_add(&refname2, r2, eol - r2);
+
+ strbuf_addf(&packed_entry, "packed-refs line %d",
+ entries[i - 1]->line_number);
+ report.path = packed_entry.buf;
+ ret = fsck_report_ref(o, &report,
+ FSCK_MSG_PACKED_REF_UNSORTED,
+ err_fmt, refname1.buf, refname2.buf);
+ goto cleanup;
+ }
+ }
+
+cleanup:
+ strbuf_release(&packed_entry);
+ strbuf_release(&refname1);
+ strbuf_release(&refname2);
+ return ret;
+}
+
static int packed_fsck_ref_content(struct fsck_options *o,
struct ref_store *ref_store,
const char *start, const char *eof)
{
struct strbuf packed_entry = STRBUF_INIT;
+ struct fsck_packed_ref_entry **entries;
struct strbuf refname = STRBUF_INIT;
+ int entry_alloc = 20;
int line_number = 1;
+ int entry_nr = 0;
const char *eol;
int ret = 0;
@@ -1919,7 +1994,13 @@ static int packed_fsck_ref_content(struct fsck_options *o,
"missing header line");
}
+ ALLOC_ARRAY(entries, entry_alloc);
while (start < eof) {
+ struct fsck_packed_ref_entry *entry
+ = create_fsck_packed_ref_entry(line_number, start);
+
+ ALLOC_GROW(entries, entry_nr + 1, entry_alloc);
+ entries[entry_nr++] = entry;
strbuf_reset(&packed_entry);
strbuf_addf(&packed_entry, "packed-refs line %d", line_number);
ret |= packed_fsck_ref_next_line(o, &packed_entry, start, eof, &eol);
@@ -1935,11 +2016,16 @@ static int packed_fsck_ref_content(struct fsck_options *o,
start = eol + 1;
line_number++;
}
+ entry->record.len = start - entry->record.start;
}
+ if (!ret)
+ ret |= packed_fsck_ref_sorted(o, ref_store, entries, entry_nr);
+
strbuf_release(&packed_entry);
strbuf_release(&refname);
strbuf_release(&packed_entry);
+ free_fsck_packed_ref_entries(entries, entry_nr);
return ret;
}
diff --git a/t/t0602-reffiles-fsck.sh b/t/t0602-reffiles-fsck.sh
index e4b4a58684..9d802d71a9 100755
--- a/t/t0602-reffiles-fsck.sh
+++ b/t/t0602-reffiles-fsck.sh
@@ -727,4 +727,42 @@ test_expect_success 'packed-refs content should be checked' '
)
'
+test_expect_success 'packed-ref sorted should be checked' '
+ test_when_finished "rm -rf repo" &&
+ git init repo &&
+ (
+ cd repo &&
+ test_commit default &&
+ git branch branch-1 &&
+ git branch branch-2 &&
+ git tag -a annotated-tag-1 -m tag-1 &&
+ branch_1_oid=$(git rev-parse branch-1) &&
+ branch_2_oid=$(git rev-parse branch-2) &&
+ tag_1_oid=$(git rev-parse annotated-tag-1) &&
+ tag_1_peeled_oid=$(git rev-parse annotated-tag-1^{}) &&
+ refname1="refs/heads/main" &&
+ refname2="refs/heads/foo" &&
+ refname3="refs/tags/foo" &&
+ printf "# pack-refs with: peeled fully-peeled sorted \n" >.git/packed-refs &&
+ printf "%s %s\n" "$branch_2_oid" "$refname1" >>.git/packed-refs &&
+ printf "%s %s\n" "$branch_1_oid" "$refname2" >>.git/packed-refs &&
+ test_must_fail git refs verify 2>err &&
+ cat >expect <<-EOF &&
+ error: packed-refs line 2: packedRefUnsorted: refname '\''$refname1'\'' is not less than next refname '\''$refname2'\''
+ EOF
+ rm .git/packed-refs &&
+ test_cmp expect err &&
+ printf "# pack-refs with: peeled fully-peeled sorted \n" >.git/packed-refs &&
+ printf "%s %s\n" "$tag_1_oid" "$refname3" >>.git/packed-refs &&
+ printf "^%s\n" "$tag_1_peeled_oid" >>.git/packed-refs &&
+ printf "%s %s\n" "$branch_2_oid" "$refname2" >>.git/packed-refs &&
+ test_must_fail git refs verify 2>err &&
+ cat >expect <<-EOF &&
+ error: packed-refs line 2: packedRefUnsorted: refname '\''$refname3'\'' is not less than next refname '\''$refname2'\''
+ EOF
+ rm .git/packed-refs &&
+ test_cmp expect err
+ )
+'
+
test_done
--
2.48.1
