procutil: make stream detection in make_line_buffered more correct and strict
In make_line_buffered(), we don’t want to wrap the stream if we know that lines
get flushed to the underlying raw stream already.
Previously, the heuristic was too optimistic. It assumed that any stream which
is not an instance of io.BufferedIOBase doesn’t need wrapping. However, there
are buffered streams that aren’t instances of io.BufferedIOBase, like
Mercurial’s own winstdout.
The new logic is different in two ways:
First, only for the check, if unwraps any combination of WriteAllWrapper and
winstdout.
Second, it skips wrapping the stream only if it is an instance of io.RawIOBase
(or already wrapped). If it is an instance of io.BufferedIOBase, it gets
wrapped. In any other case, the function raises an exception. This ensures
that, if an unknown stream is passed or we add another wrapper in the future,
we don’t wrap the stream if it’s already line buffered or not wrap the stream
if it’s not line buffered. In fact, this was already helpful during development
of this change. Without it, I possibly would have forgot that WriteAllWrapper
needs to be ignored for the check, leading to unnecessary wrapping if stdout is
unbuffered.
The alternative would have been to always wrap unknown streams. However, I
don’t think that anyone would benefit from being less strict. We can expect
streams from the standard library to be subclassing either io.RawIOBase or
io.BufferedIOBase, so running Mercurial in the standard way should not regress
by this change. Py2exe might replace sys.stdout and sys.stderr, but that
currently breaks Mercurial anyway and also these streams don’t claim to be
interactive, so this function is not called for them.
Tests for experimental.removeemptydirs
$ cat >> pwd.py << EOF
> import os
> try:
> print(os.getcwd())
> except OSError:
> print("<directory is no longer accessible>")
> EOF
$ NO_RM=--config=experimental.removeemptydirs=0
$ DO_RM=--config=experimental.removeemptydirs=1
$ isdir() { if [ -d $1 ]; then echo yes; else echo no; fi }
$ isfile() { if [ -f $1 ]; then echo yes; else echo no; fi }
`hg rm` of the last file in a directory:
$ hg init hgrm
$ cd hgrm
$ mkdir somedir
$ echo hi > somedir/foo
$ hg ci -qAm foo
$ isdir somedir
yes
$ hg rm somedir/foo
$ isdir somedir
no
$ hg revert -qa
$ isdir somedir
yes
$ hg $NO_RM rm somedir/foo
$ isdir somedir
yes
$ ls somedir
$ cd $TESTTMP
`hg mv` of the last file in a directory:
$ hg init hgmv
$ cd hgmv
$ mkdir somedir
$ mkdir destdir
$ echo hi > somedir/foo
$ hg ci -qAm foo
$ isdir somedir
yes
$ hg mv somedir/foo destdir/foo
$ isdir somedir
no
$ hg revert -qa
(revert doesn't get rid of destdir/foo?)
$ rm destdir/foo
$ isdir somedir
yes
$ hg $NO_RM mv somedir/foo destdir/foo
$ isdir somedir
yes
$ ls somedir
$ cd $TESTTMP
Updating to a commit that doesn't have the directory:
$ hg init hgupdate
$ cd hgupdate
$ echo hi > r0
$ hg ci -qAm r0
$ mkdir somedir
$ echo hi > somedir/foo
$ hg ci -qAm r1
$ isdir somedir
yes
$ hg co -q -r ".^"
$ isdir somedir
no
$ hg co -q tip
$ isdir somedir
yes
$ hg $NO_RM co -q -r ".^"
$ isdir somedir
yes
$ ls somedir
$ cd $TESTTMP
Rebasing across a commit that doesn't have the directory, from inside the
directory:
$ hg init hgrebase
$ cd hgrebase
$ echo hi > r0
$ hg ci -qAm r0
$ mkdir somedir
$ echo hi > somedir/foo
$ hg ci -qAm first_rebase_source
$ hg $NO_RM co -q -r ".^"
$ echo hi > somedir/bar
$ hg ci -qAm first_rebase_dest
$ hg $NO_RM co -q -r ".^"
$ echo hi > somedir/baz
$ hg ci -qAm second_rebase_dest
$ hg co -qr 'desc(first_rebase_source)'
$ cd $TESTTMP/hgrebase/somedir
$ hg --config extensions.rebase= rebase -qr . -d 'desc(first_rebase_dest)'
current directory was removed (rmcwd !)
(consider changing to repo root: $TESTTMP/hgrebase) (rmcwd !)
$ cd $TESTTMP/hgrebase/somedir
(The current node is the rebased first_rebase_source on top of
first_rebase_dest)
This should not output anything about current directory being removed:
$ hg $NO_RM --config extensions.rebase= rebase -qr . -d 'desc(second_rebase_dest)'
$ cd $TESTTMP
Histediting across a commit that doesn't have the directory, from inside the
directory (reordering nodes):
A directory with the right pass exists at the end of the run, but it is a
different directory than the current one.
Windows is not affected
$ hg init hghistedit
$ cd hghistedit
$ echo hi > r0
$ hg ci -qAm r0
$ echo hi > r1
$ hg ci -qAm r1
$ echo hi > r2
$ hg ci -qAm r2
$ mkdir somedir
$ echo hi > somedir/foo
$ hg ci -qAm migrating_revision
$ cat > histedit_commands <<EOF
> pick 89079fab8aee 0 r0
> pick e6d271df3142 1 r1
> pick 89e25aa83f0f 3 migrating_revision
> pick b550aa12d873 2 r2
> EOF
$ cd $TESTTMP/hghistedit/somedir
$ hg $DO_RM --config extensions.histedit= histedit -q --commands ../histedit_commands
current directory was removed (no-windows !)
(consider changing to repo root: $TESTTMP/hghistedit) (no-windows !)
$ ls -1 $TESTTMP/hghistedit/
histedit_commands
r0
r1
r2
somedir
#if windows
$ "$PYTHON" "$TESTTMP/pwd.py"
$TESTTMP/hghistedit/somedir
#else
$ echo ${PWD} # no-pwd-check
$TESTTMP/hghistedit/somedir
$ "$PYTHON" "$TESTTMP/pwd.py"
<directory is no longer accessible>
#endif
$ ls -1 $TESTTMP/hghistedit/somedir
foo
$ ls -1
foo (windows !)
Get out of the doomed directory
$ cd $TESTTMP/hghistedit
chdir: error retrieving current directory: getcwd: cannot access parent directories: $ENOENT$ (?)
$ hg files --rev . | grep somedir/
somedir/foo
$ cat > histedit_commands <<EOF
> pick 89079fab8aee 0 r0
> pick 7c7a22c6009f 3 migrating_revision
> pick e6d271df3142 1 r1
> pick 40a53c2d4276 2 r2
> EOF
$ cd $TESTTMP/hghistedit/somedir
$ hg $NO_RM --config extensions.histedit= histedit -q --commands ../histedit_commands
Regardless of system, we should always get a 'yes' here.
$ isfile foo
yes
$ cd $TESTTMP
This is essentially the exact test from issue5826, just cleaned up a little:
$ hg init issue5826_withrm
$ cd issue5826_withrm
Let's only turn this on for this repo so that we don't contaminate later tests.
$ cat >> .hg/hgrc <<EOF
> [extensions]
> histedit =
> EOF
Commit three revisions that each create a directory:
$ mkdir foo
$ touch foo/bar
$ hg commit -qAm "add foo"
$ mkdir bar
$ touch bar/bar
$ hg commit -qAm "add bar"
$ mkdir baz
$ touch baz/bar
$ hg commit -qAm "add baz"
Enter the first directory:
$ cd foo
Histedit doing 'pick, pick, fold':
#if rmcwd
$ hg histedit --commands - <<EOF
> pick 6274c77c93c3 1 add bar
> pick ff70a87b588f 0 add foo
> fold 9992bb0ac0db 2 add baz
> EOF
current directory was removed
(consider changing to repo root: $TESTTMP/issue5826_withrm)
abort: $ENOENT$
[255]
Go back to the repo root after losing it as part of that operation:
$ cd $TESTTMP/issue5826_withrm
Note the lack of a non-zero exit code from this function - it exits
successfully, but doesn't really do anything.
$ hg histedit --continue
9992bb0ac0db: cannot fold - working copy is not a descendant of previous commit 5c806432464a
saved backup bundle to $TESTTMP/issue5826_withrm/.hg/strip-backup/ff70a87b588f-e94f9789-histedit.hg
$ hg log -T '{rev}:{node|short} {desc}\n'
2:94e3f9fae1d6 fold-temp-revision 9992bb0ac0db
1:5c806432464a add foo
0:d17db4b0303a add bar
#else
$ cd $TESTTMP/issue5826_withrm
$ hg histedit --commands - <<EOF
> pick 6274c77c93c3 1 add bar
> pick ff70a87b588f 0 add foo
> fold 9992bb0ac0db 2 add baz
> EOF
saved backup bundle to $TESTTMP/issue5826_withrm/.hg/strip-backup/5c806432464a-cd4c8d86-histedit.hg
$ hg log -T '{rev}:{node|short} {desc}\n'
1:b9eddaa97cbc add foo
***
add baz
0:d17db4b0303a add bar
#endif
Now test that again with experimental.removeemptydirs=false:
$ hg init issue5826_norm
$ cd issue5826_norm
Let's only turn this on for this repo so that we don't contaminate later tests.
$ cat >> .hg/hgrc <<EOF
> [extensions]
> histedit =
> [experimental]
> removeemptydirs = false
> EOF
Commit three revisions that each create a directory:
$ mkdir foo
$ touch foo/bar
$ hg commit -qAm "add foo"
$ mkdir bar
$ touch bar/bar
$ hg commit -qAm "add bar"
$ mkdir baz
$ touch baz/bar
$ hg commit -qAm "add baz"
Enter the first directory:
$ cd foo
Histedit doing 'pick, pick, fold':
$ hg histedit --commands - <<EOF
> pick 6274c77c93c3 1 add bar
> pick ff70a87b588f 0 add foo
> fold 9992bb0ac0db 2 add baz
> EOF
saved backup bundle to $TESTTMP/issue5826_withrm/issue5826_norm/.hg/strip-backup/5c806432464a-cd4c8d86-histedit.hg
Note the lack of a 'cd' being necessary here, and we don't need to 'histedit
--continue'
$ hg log -T '{rev}:{node|short} {desc}\n'
1:b9eddaa97cbc add foo
***
add baz
0:d17db4b0303a add bar
$ cd $TESTTMP