packed-backend: check whether the "packed-refs" is sorted

index 02a7bf0503..9601fff228 100644 --- a/Documentation/fsck-msgids.txt +++ b/Documentation/fsck-msgids.txt @@ -187,6 +187,9 @@ (ERROR) The "packed-refs" file contains an entry that is not terminated by a newline. +`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

index 14d70f6653..19f3cb2773 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) \

index ef20300fd3..813e5020e4 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. @@ -1797,19 +1803,33 @@ static int packed_fsck_ref_next_line(struct fsck_options *o, } static int packed_fsck_ref_header(struct fsck_options *o, - const char *start, const char *eol) + const char *start, const char *eol, + unsigned int *sorted) { - if (!starts_with(start, "# pack-refs with: ")) { + struct string_list traits = STRING_LIST_INIT_NODUP; + char *tmp_line; + int ret = 0; + char *p; + + tmp_line = xmemdupz(start, eol - start); + if (!skip_prefix(tmp_line, "# pack-refs with: ", (const char **)&p)) { struct fsck_ref_report report = { 0 }; report.path = "packed-refs.header"; - return fsck_report_ref(o, &report, - FSCK_MSG_BAD_PACKED_REF_HEADER, - "'%.*s' does not start with '# pack-refs with: '", - (int)(eol - start), start); + ret = fsck_report_ref(o, &report, + FSCK_MSG_BAD_PACKED_REF_HEADER, + "'%.*s' does not start with '# pack-refs with: '", + (int)(eol - start), start); + goto cleanup; } - return 0; + string_list_split_in_place(&traits, p, " ", -1); + *sorted = unsorted_string_list_has_string(&traits, "sorted"); + +cleanup: + free(tmp_line); + string_list_clear(&traits, 0); + return ret; } static int packed_fsck_ref_peeled_line(struct fsck_options *o, @@ -1915,8 +1935,68 @@ cleanup: return ret; } +static int packed_fsck_ref_sorted(struct fsck_options *o, + struct ref_store *ref_store, + const char *start, const char *eof) +{ + 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; + unsigned long line_number = 1; + const char *former = NULL; + const char *current; + const char *eol; + int ret = 0; + + if (*start == '#') { + eol = memchr(start, '\n', eof - start); + start = eol + 1; + line_number++; + } + + for (; start < eof; line_number++, start = eol + 1) { + eol = memchr(start, '\n', eof - start); + + if (*start == '^') + continue; + + if (!former) { + former = start + hexsz + 1; + continue; + } + + current = start + hexsz + 1; + if (cmp_packed_refname(former, current) >= 0) { + const char *err_fmt = + "refname '%s' is less than previous refname '%s'"; + + eol = memchr(former, '\n', eof - former); + strbuf_add(&refname1, former, eol - former); + eol = memchr(current, '\n', eof - current); + strbuf_add(&refname2, current, eol - current); + + strbuf_addf(&packed_entry, "packed-refs line %lu", line_number); + report.path = packed_entry.buf; + ret = fsck_report_ref(o, &report, + FSCK_MSG_PACKED_REF_UNSORTED, + err_fmt, refname2.buf, refname1.buf); + goto cleanup; + } + former = current; + } + +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, + unsigned int *sorted, const char *start, const char *eof) { struct strbuf refname = STRBUF_INIT; @@ -1926,7 +2006,7 @@ static int packed_fsck_ref_content(struct fsck_options *o, ret |= packed_fsck_ref_next_line(o, line_number, start, eof, &eol); if (*start == '#') { - ret |= packed_fsck_ref_header(o, start, eol); + ret |= packed_fsck_ref_header(o, start, eol, sorted); start = eol + 1; line_number++; @@ -1957,6 +2037,7 @@ static int packed_fsck(struct ref_store *ref_store, struct packed_ref_store *refs = packed_downcast(ref_store, REF_STORE_READ, "fsck"); struct strbuf packed_ref_content = STRBUF_INIT; + unsigned int sorted = 0; struct stat st; int ret = 0; int fd = -1; @@ -2004,8 +2085,11 @@ static int packed_fsck(struct ref_store *ref_store, goto cleanup; } - ret = packed_fsck_ref_content(o, ref_store, packed_ref_content.buf, + ret = packed_fsck_ref_content(o, ref_store, &sorted, packed_ref_content.buf, packed_ref_content.buf + packed_ref_content.len); + if (!ret && sorted) + ret = packed_fsck_ref_sorted(o, ref_store, packed_ref_content.buf, + packed_ref_content.buf + packed_ref_content.len); cleanup: if (fd >= 0)

index a88c792ce1..767e2bd4a0 100755 --- a/t/t0602-reffiles-fsck.sh +++ b/t/t0602-reffiles-fsck.sh @@ -743,4 +743,91 @@ test_expect_success 'packed-refs content should be checked' ' ) ' +test_expect_success 'packed-ref with sorted trait 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" && + + cat >.git/packed-refs <<-EOF && + # pack-refs with: peeled fully-peeled sorted + EOF + git refs verify 2>err && + rm .git/packed-refs && + test_must_be_empty err && + + cat >.git/packed-refs <<-EOF && + # pack-refs with: peeled fully-peeled sorted + $branch_2_oid $refname1 + EOF + git refs verify 2>err && + rm .git/packed-refs && + test_must_be_empty err && + + cat >.git/packed-refs <<-EOF && + # pack-refs with: peeled fully-peeled sorted + $branch_2_oid $refname1 + $branch_1_oid $refname2 + $tag_1_oid $refname3 + EOF + test_must_fail git refs verify 2>err && + cat >expect <<-EOF && + error: packed-refs line 3: packedRefUnsorted: refname '\''$refname2'\'' is less than previous refname '\''$refname1'\'' + EOF + rm .git/packed-refs && + test_cmp expect err && + + cat >.git/packed-refs <<-EOF && + # pack-refs with: peeled fully-peeled sorted + $tag_1_oid $refname3 + ^$tag_1_peeled_oid + $branch_2_oid $refname2 + EOF + test_must_fail git refs verify 2>err && + cat >expect <<-EOF && + error: packed-refs line 4: packedRefUnsorted: refname '\''$refname2'\'' is less than previous refname '\''$refname3'\'' + EOF + rm .git/packed-refs && + test_cmp expect err + ) +' + +test_expect_success 'packed-ref without sorted trait should not be checked' ' + test_when_finished "rm -rf repo" && + git init repo && + ( + cd repo && + test_commit default && + git branch branch-1 && + git branch branch-2 && + git tag -a annotated-tag-1 -m tag-1 && + branch_1_oid=$(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" && + + cat >.git/packed-refs <<-EOF && + # pack-refs with: peeled fully-peeled + $branch_2_oid $refname1 + $branch_1_oid $refname2 + EOF + git refs verify 2>err && + test_must_be_empty err + ) +' + test_done