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Merge branch 'jk/for-each-reflog-ent-reverse'

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The code that reads the reflog from the newer to the older entries
did not handle an entry that crosses a boundary of block it uses to
read them correctly.

* jk/for-each-reflog-ent-reverse:
  for_each_reflog_ent_reverse: turn leftover check into assertion
  for_each_reflog_ent_reverse: fix newlines on block boundaries
This commit is contained in:
Junio C Hamano 2014-12-22 12:27:32 -08:00
parent 12b9f08953 69216bf72b
commit 6f3abb7a87
2 changed files with 68 additions and 13 deletions
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51
refs.c
View file

@ -3413,29 +3413,54 @@ int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void
bp = find_beginning_of_line(buf, scanp);
if (*bp != '\n') {
strbuf_splice(&sb, 0, 0, buf, endp - buf);
if (pos)
break; /* need to fill another block */
scanp = buf - 1; /* leave loop */
} else {
if (*bp == '\n') {
/*
* (bp + 1) thru endp is the beginning of the
* current line we have in sb
* The newline is the end of the previous line,
* so we know we have complete line starting
* at (bp + 1). Prefix it onto any prior data
* we collected for the line and process it.
*/
strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
scanp = bp;
endp = bp + 1;
}
ret = show_one_reflog_ent(&sb, fn, cb_data);
strbuf_reset(&sb);
if (ret)
ret = show_one_reflog_ent(&sb, fn, cb_data);
strbuf_reset(&sb);
if (ret)
break;
} else if (!pos) {
/*
* We are at the start of the buffer, and the
* start of the file; there is no previous
* line, and we have everything for this one.
* Process it, and we can end the loop.
*/
strbuf_splice(&sb, 0, 0, buf, endp - buf);
ret = show_one_reflog_ent(&sb, fn, cb_data);
strbuf_reset(&sb);
break;
}
if (bp == buf) {
/*
* We are at the start of the buffer, and there
* is more file to read backwards. Which means
* we are in the middle of a line. Note that we
* may get here even if *bp was a newline; that
* just means we are at the exact end of the
* previous line, rather than some spot in the
* middle.
*
* Save away what we have to be combined with
* the data from the next read.
*/
strbuf_splice(&sb, 0, 0, buf, endp - buf);
break;
}
}
}
if (!ret && sb.len)
ret = show_one_reflog_ent(&sb, fn, cb_data);
die("BUG: reverse reflog parser had leftover data");
fclose(logfp);
strbuf_release(&sb);

30
t/t1410-reflog.sh
View file

@ -287,4 +287,34 @@ test_expect_success 'stale dirs do not cause d/f conflicts (reflogs off)' '
test_cmp expect actual
'
# Triggering the bug detected by this test requires a newline to fall
# exactly BUFSIZ-1 bytes from the end of the file. We don't know
# what that value is, since it's platform dependent. However, if
# we choose some value N, we also catch any D which divides N evenly
# (since we will read backwards in chunks of D). So we choose 8K,
# which catches glibc (with an 8K BUFSIZ) and *BSD (1K).
#
# Each line is 114 characters, so we need 75 to still have a few before the
# last 8K. The 89-character padding on the final entry lines up our
# newline exactly.
test_expect_success 'parsing reverse reflogs at BUFSIZ boundaries' '
git checkout -b reflogskip &&
z38=00000000000000000000000000000000000000 &&
ident="abc <xyz> 0000000001 +0000" &&
for i in $(test_seq 1 75); do
printf "$z38%02d $z38%02d %s\t" $i $(($i+1)) "$ident" &&
if test $i = 75; then
for j in $(test_seq 1 89); do
printf X
done
else
printf X
fi &&
printf "\n"
done >.git/logs/refs/heads/reflogskip &&
git rev-parse reflogskip@{73} >actual &&
echo ${z38}03 >expect &&
test_cmp expect actual
'
test_done