Mercurial > hg
view tests/test-mq-eol.t @ 42377:0546ead39a7e stable
manifest: avoid corruption by dropping removed files with pure (issue5801)
Previously, removed files would simply be marked by overwriting the first byte
with NUL and dropping their entry in `self.position`. But no effort was made to
ignore them when compacting the dictionary into text form. This allowed them to
slip into the manifest revision, since the code seems to be trying to minimize
the string operations by copying as large a chunk as possible. As part of this,
compact() walks the existing text based on entries in the `positions` list, and
consumed everything up to the next position entry. This typically resulted in
a ValueError complaining about unsorted manifest entries.
Sometimes it seems that files do get dropped in large repos- it seems to
correspond to there being a new entry that would take the same slot. A much
more trivial problem is that if the only changes were removals, `_compact()`
didn't even run because `__delitem__` doesn't add anything to `self.extradata`.
Now there's an explicit variable to flag this, both to allow `_compact()` to
run, and to avoid searching the manifest in cases where there are no removals.
In practice, this behavior was mostly obscured by the check in fastdelta() which
takes a different path that explicitly drops removed files if there are fewer
than 1000 changes. However, timeless has a repo where after rebasing tens of
commits, a totally different path[1] is taken that bypasses the change count
check and hits this problem.
[1] https://www.mercurial-scm.org/repo/hg/file/2338bdea4474/mercurial/manifest.py#l1511
author | Matt Harbison <matt_harbison@yahoo.com> |
---|---|
date | Thu, 23 May 2019 21:54:24 -0400 |
parents | 140b542b0e59 |
children |
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Test interactions between mq and patch.eol $ cat <<EOF >> $HGRCPATH > [extensions] > mq = > [diff] > nodates = 1 > EOF $ cat > makepatch.py <<EOF > f = open('eol.diff', 'wb') > w = f.write > w(b'test message\n') > w(b'diff --git a/a b/a\n') > w(b'--- a/a\n') > w(b'+++ b/a\n') > w(b'@@ -1,5 +1,5 @@\n') > w(b' a\n') > w(b'-b\r\n') > w(b'+y\r\n') > w(b' c\r\n') > w(b' d\n') > w(b'-e\n') > w(b'\\\\ No newline at end of file\n') > w(b'+z\r\n') > w(b'\\\\ No newline at end of file\r\n') > EOF $ cat > cateol.py <<EOF > import sys > try: > stdout = sys.stdout.buffer > except AttributeError: > stdout = sys.stdout > for line in open(sys.argv[1], 'rb'): > line = line.replace(b'\r', b'<CR>') > line = line.replace(b'\n', b'<LF>') > stdout.write(line + b'\n') > EOF $ hg init repo $ cd repo $ echo '\.diff' > .hgignore $ echo '\.rej' >> .hgignore Test different --eol values $ "$PYTHON" -c 'open("a", "wb").write(b"a\nb\nc\nd\ne")' $ hg ci -Am adda adding .hgignore adding a $ "$PYTHON" ../makepatch.py $ hg qimport eol.diff adding eol.diff to series file should fail in strict mode $ hg qpush applying eol.diff patching file a Hunk #1 FAILED at 0 1 out of 1 hunks FAILED -- saving rejects to file a.rej patch failed, unable to continue (try -v) patch failed, rejects left in working directory errors during apply, please fix and qrefresh eol.diff [2] $ hg qpop popping eol.diff patch queue now empty invalid eol $ hg --config patch.eol='LFCR' qpush applying eol.diff patch failed, unable to continue (try -v) patch failed, rejects left in working directory errors during apply, please fix and qrefresh eol.diff [2] $ hg qpop popping eol.diff patch queue now empty force LF $ hg --config patch.eol='CRLF' qpush applying eol.diff now at: eol.diff $ hg qrefresh $ "$PYTHON" ../cateol.py .hg/patches/eol.diff # HG changeset patch<LF> # Parent 0d0bf99a8b7a3842c6f8ef09e34f69156c4bd9d0<LF> test message<LF> <LF> diff -r 0d0bf99a8b7a a<LF> --- a/a<LF> +++ b/a<LF> @@ -1,5 +1,5 @@<LF> -a<LF> -b<LF> -c<LF> -d<LF> -e<LF> \ No newline at end of file<LF> +a<CR><LF> +y<CR><LF> +c<CR><LF> +d<CR><LF> +z<LF> \ No newline at end of file<LF> $ "$PYTHON" ../cateol.py a a<CR><LF> y<CR><LF> c<CR><LF> d<CR><LF> z $ hg qpop popping eol.diff patch queue now empty push again forcing LF and compare revisions $ hg --config patch.eol='CRLF' qpush applying eol.diff now at: eol.diff $ "$PYTHON" ../cateol.py a a<CR><LF> y<CR><LF> c<CR><LF> d<CR><LF> z $ hg qpop popping eol.diff patch queue now empty push again without LF and compare revisions $ hg qpush applying eol.diff now at: eol.diff $ "$PYTHON" ../cateol.py a a<CR><LF> y<CR><LF> c<CR><LF> d<CR><LF> z $ hg qpop popping eol.diff patch queue now empty $ cd .. Test .rej file EOL are left unchanged $ hg init testeol $ cd testeol $ "$PYTHON" -c "open('a', 'wb').write(b'1\r\n2\r\n3\r\n4')" $ hg ci -Am adda adding a $ "$PYTHON" -c "open('a', 'wb').write(b'1\r\n2\r\n33\r\n4')" $ hg qnew patch1 $ hg qpop popping patch1 patch queue now empty $ "$PYTHON" -c "open('a', 'wb').write(b'1\r\n22\r\n33\r\n4')" $ hg ci -m changea $ hg --config 'patch.eol=LF' qpush applying patch1 patching file a Hunk #1 FAILED at 0 1 out of 1 hunks FAILED -- saving rejects to file a.rej patch failed, unable to continue (try -v) patch failed, rejects left in working directory errors during apply, please fix and qrefresh patch1 [2] $ hg qpop popping patch1 patch queue now empty $ cat a.rej --- a +++ a @@ -1,4 +1,4 @@ 1\r (esc) 2\r (esc) -3\r (esc) +33\r (esc) 4 \ No newline at end of file $ hg --config 'patch.eol=auto' qpush applying patch1 patching file a Hunk #1 FAILED at 0 1 out of 1 hunks FAILED -- saving rejects to file a.rej patch failed, unable to continue (try -v) patch failed, rejects left in working directory errors during apply, please fix and qrefresh patch1 [2] $ hg qpop popping patch1 patch queue now empty $ cat a.rej --- a +++ a @@ -1,4 +1,4 @@ 1\r (esc) 2\r (esc) -3\r (esc) +33\r (esc) 4 \ No newline at end of file $ cd ..