weekly.2011-06-02
Andrew Gerrand
can update by running:
hg pull
hg update weekly
This release includes changes to the exec package that will require changes
to client code.
The exec package has been re-designed with a more convenient and succinct API.
This code:
args := []string{“diff”, “-u”, “file1.txt”, “file2.txt”}
p, err := exec.Run(“/usr/bin/diff”, args, os.Environ(), "",
exec.DevNull, exec.Pipe, exec.DevNull)
if err != nil {
return nil, err
}
var buf bytes.Buffer
io.Copy(&buf, p.Stdout)
w, err := p.Wait(0)
p.Close()
if err != nil {
return nil, err
}
return buf.Bytes(), err
can be rewritten as:
return exec.Command(“diff”, “-u”, “file1.txt”, “file2.txt”).Output()
See the exec package documentation for the details ("godoc exec").
By setting the GOPATH environment variable you can use goinstall to build and
install your own code and external libraries outside of the Go tree (and avoid
writing Makefiles).
See the goinstall command documentation for the details ("godoc goinstall").
Other changes:
* 5g: alignment fixes.
* 6l, 8l: fix Mach-O binaries with many dynamic libraries.
* 8l: emit resources (.rsrc) in Windows PE. (thanks Wei Guangjing).
* asn1: fix marshalling of empty optional RawValues (thanks Mikkel Krautz).
* big: make Int and Rat implement fmt.Scanner (thanks Evan Shaw),
~8x faster number scanning,
remove some unnecessary conversions.
* cgo: restrict #cgo directives to prevent shell expansion (thanks
Gustavo Niemeyer),
support pkg-config for flags and libs (thanks Gustavo Niemeyer).
* compress/flate: fix Huffman tree bug,
do not use background goroutines.
* crypto/openpgp: add support for symmetrically encrypting files.
* crypto/tls/generate_cert.go: fix misspelling of O_CREATE.
* dashboard: send notification emails when the build breaks.
* doc: mention go/printer instead of container/vector in effective go,
put Release History link on 'Documentation' page,
put Weekly Snapshot History link on 'Contributing' page.
* encoding/base64: add DecodeString and EncodeToString.
* encoding/binary: add a non-reflect fast path for Read,
add a non-reflect fast path for Write.
* encoding/hex: add hex dumping.
* encoding/line: delete package. Its functionality is now in bufio.
* filepath: Abs must always return a clean path (thanks Gustavo Niemeyer).
* fmt: fix bug in UnreadRune,
make %q work for integers, printing a quoted character literal,
return EOF when out of input in Scan*.
* gc: check parameter declarations in interface fields (thanks Anthony Martin),
disallow ... in type conversions (thanks Anthony Martin),
do not force heap allocation on referencing outer variable in a closure,
fix m[x], _ = y.(T),
implement new shift rules,
patch y.tab.c to fix build when using Bison 2.5,
relax assignability of method receivers (thanks Anthony Martin),
typecheck the whole tree before walking.
* go/scanner: don't allow "0x" and "0X" as integers (thanks Evan Shaw).
* gobuilder: fixes for windows (thanks Alex Brainman).
* godoc: basic setup for running godoc on local app engine emulator,
display advert for the package dashboard on package list page.
* goinstall: fixes for windows (thanks Alex Brainman),
more verbose logging with -v.
* gotest, pkg/exec: use bash to run shell scripts on windows (thanks
Alex Brainman).
* http/spdy: redo interfaces, flesh out implementation & frame types
(thanks William Chan).
* http: Transport hook to register non-http(s) protocols,
add client+server benchmark,
catch Handler goroutine panics,
fix Set-Cookie date parsing,
have client set Content-Length when possible,
let Transport use a custom net.Dial function,
propagate Set-Cookie in reverse proxy,
ServeFile shouldn't send Content-Length when Content-Encoding is set.
* image: add a SubImage method.
* image/gif: simplify blockReader.Read.
* image/png: fix encoding of images that don't start at (0, 0).
* io, net, http: sendfile support.
* io: add ByteScanner, RuneScanner interfaces.
* ld: add -w to disable dwarf, make errors obviously from dwarf.
* mail: new package.
* mime/multipart: misc code/doc fixes.
* misc/cgo: remove reference to 'destroy' function.
* misc/emacs: don't select the mark after gofmt (thanks Eric Eisner).
* misc/gophertool: Chrome extension to aid in Go development
* misc/vim: limit Fmt command to Go buffers (thanks Yasuhiro Matsumoto).
* net: if we stop polling, remove any pending events for the socket,
update IP multicast socket options (thanks Mikio Hara).
* os: Fix test to work on Solaris,
fix Readdir(0) on EOF,
fix Readdir, Readdirnames (thanks Yuval Pavel Zholkover),
fix os.MkdirAll with backslash path separator (thanks Yasuhiro
Matsumoto),
handle OpenFile flag parameter properly on Windows (thanks
Alex Brainman).
* path/filepath: remove string constants.
* pkg: spelling tweaks, I-Z (thanks Robert Hencke).
* quietgcc: fix typo, respect $TMPDIR.
* runtime: do not garbage collect windows callbacks (thanks Alex Brainman),
fix mmap error return on linux (thanks Dmitry Chestnykh),
reset GOMAXPROCS during tests,
save cdecl registers in Windows SEH handler (thanks Alexey Borzenkov).
* spec: be precise with the use of the informal ellipsis and the Go token,
clarify rules for shifts.
* strconv: add QuoteRune; analogous to Quote but for runes rather than strings.
* strings: implement UnreadByte, UnreadRune.
* sync: always wake up sleeping goroutines on Cond.Signal (thanks
Gustavo Niemeyer).
* sync/atomic: fix check64.
* syscall: add ProcAttr field to pass an unescaped command line on
windows (thanks Vincent Vanackere),
add routing messages support for Linux and BSD (thanks Mikio Hara).
* template: fixes and clean-ups (thanks Gustavo Niemeyer).
* time: fix Format bug: midnight/noon are 12AM/PM not 0AM/PM.
* unicode: make the tables smaller.
Apologies if we missed anyone in the list above. We appreciate all your help.
To see a full list of changes between this and the previous weekly,
after updating, run:
hg log -r weekly.2011-05-22:weekly.2011-06-02
Enjoy.
Andrew
Steve Phillips
set and disposing of exec.Run()'s verbosity.
What's the plan as far as which version will be supported on App
Engine? Hopefully App Engine's Go will be updated more frequently
than Python :-).
--Steve
Anschel Schaffer-Cohen
Andrew Gerrand
> The plan, as far as I understand, is for the App Engine to always support
> the "release" version, rather than the weekly.
That's correct. The App Engine Go SDK will be built against the latest
Go release tag, but the two will not necessarily be released in sync.
Andrew