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.
===============================================
Testing merge involving change to the exec flag
===============================================
#require execbit
Initial setup
==============
$ hg init base-repo
$ cd base-repo
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ touch b
$ hg add a b
$ hg commit -m "initial commit"
$ cd ..
$ hg init base-exec
$ cd base-exec
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ chmod +x a
$ touch b
$ hg add a b
$ hg commit -m "initial commit"
$ cd ..
Testing merging mode change
===========================
Adding the flag
---------------
setup
Change on one side, executable bit on the other
$ hg clone base-repo simple-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd simple-merge-repo
$ chmod +x a
$ hg ci -m "make a executable, no change"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg commit -m "edit end of file"
created new head
merge them (from the update side)
$ hg merge 'desc("make a executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 'desc("edit end of file")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
Change on one side, executable bit on the other
$ hg clone base-exec simple-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd simple-merge-repo-removal
$ chmod -x a
$ hg ci -m "make a non-executable, no change"
$ [ -x a ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg commit -m "edit end of file"
created new head
merge them (from the update side)
$ hg merge 'desc("make a non-executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 'desc("edit end of file")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] && echo "executable bit not removed"
[1]
$ cd ..
Testing merging mode change with rename
=======================================
Adding the flag
---------------
$ hg clone base-repo rename-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename-merge-repo
make "a" executable on one side
$ chmod +x a
$ hg status
M a
$ hg ci -m "make a executable"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ hg ci -m "rename a to z"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a executable")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
$ hg clone base-exec rename-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename-merge-repo-removal
make "a" non-executable on one side
$ chmod -x a
$ hg status
M a
$ hg ci -m "make a non-executable"
$ [ -x a ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ hg ci -m "rename a to z"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a non-executable")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] && echo "executable bit not removed"
[1]
$ cd ..
Testing merging mode change with rename + modification on both side
===================================================================
Adding the flag
---------------
$ hg clone base-repo rename+mod-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename+mod-merge-repo
make "a" executable on one side
$ chmod +x a
$ cat << EOF > a
> 1
> x
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ hg status
M a
$ hg ci -m "make a executable, and change start"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ cat << EOF > z
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg ci -m "rename a to z, and change end"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a executable")'
merging z and a to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
merging a and z to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
$ hg clone base-exec rename+mod-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename+mod-merge-repo-removal
make "a" non-executable on one side
$ chmod -x a
$ cat << EOF > a
> 1
> x
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ hg status
M a
$ hg ci -m "make a non-executable, and change start"
$ [ -x z ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ cat << EOF > z
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg ci -m "rename a to z, and change end"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a non-executable")'
merging z and a to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
merging a and z to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] && echo "executable bit not removed"
[1]
$ cd ..