Derek Ch b48f4bf523 fix a race crash when building with "ADD some-broken.tar.xz ..." ... The race is between pools.Put which calls buf.Reset and exec.Cmd doing io.Copy from the buffer; it caused a runtime crash, as described in #16924: ``` docker-daemon cat the-tarball.xz | xz -d -c -q | docker-untar /path/to/... (aufs ) ``` When docker-untar side fails (like try to set xattr on aufs, or a broken tar), invokeUnpack will be responsible to exhaust all input, otherwise `xz` will be write pending for ever. this change add a receive only channel to cmdStream, and will close it to notify it's now safe to close the input stream; in CmdStream the change to use Stdin / Stdout / Stderr keeps the code simple, os/exec.Cmd will spawn goroutines and call io.Copy automatically. the CmdStream is actually called in the same file only, change it lowercase to mark as private. [...] INFO[0000] Docker daemon commit=0a8c2e3 execdriver=native-0.2 graphdriver=aufs version=1.8.2 DEBU[0006] Calling POST /build INFO[0006] POST /v1.20/build?cgroupparent=&cpuperiod=0&cpuquota=0&cpusetcpus=&cpusetmems=&cpushares=0&dockerfile=Dockerfile&memory=0&memswap=0&rm=1&t=gentoo-x32&ulimits=null DEBU[0008] [BUILDER] Cache miss DEBU[0009] Couldn't untar /home/lib-docker-v1.8.2-tmp/tmp/docker-build316710953/stage3-x32-20151004.tar.xz to /home/lib-docker-v1.8.2-tmp/aufs/mnt/d909abb87150463939c13e8a349b889a72d9b14f0cfcab42a8711979be285537: Untar re-exec error: exit status 1: output: operation not supported DEBU[0009] CopyFileWithTar(/home/lib-docker-v1.8.2-tmp/tmp/docker-build316710953/stage3-x32-20151004.tar.xz, /home/lib-docker-v1.8.2-tmp/aufs/mnt/d909abb87150463939c13e8a349b889a72d9b14f0cfcab42a8711979be285537/) panic: runtime error: slice bounds out of range goroutine 42 [running]: bufio.(*Reader).fill(0xc208187800) /usr/local/go/src/bufio/bufio.go:86 +0x2db bufio.(*Reader).WriteTo(0xc208187800, 0x7ff39602d150, 0xc2083f11a0, 0x508000, 0x0, 0x0) /usr/local/go/src/bufio/bufio.go:449 +0x27e io.Copy(0x7ff39602d150, 0xc2083f11a0, 0x7ff3960261f8, 0xc208187800, 0x0, 0x0, 0x0) /usr/local/go/src/io/io.go:354 +0xb2 github.com/docker/docker/pkg/archive.func·006() /go/src/github.com/docker/docker/pkg/archive/archive.go:817 +0x71 created by github.com/docker/docker/pkg/archive.CmdStream /go/src/github.com/docker/docker/pkg/archive/archive.go:819 +0x1ec goroutine 1 [chan receive]: main.(*DaemonCli).CmdDaemon(0xc20809da30, 0xc20800a020, 0xd, 0xd, 0x0, 0x0) /go/src/github.com/docker/docker/docker/daemon.go:289 +0x1781 reflect.callMethod(0xc208140090, 0xc20828fce0) /usr/local/go/src/reflect/value.go:605 +0x179 reflect.methodValueCall(0xc20800a020, 0xd, 0xd, 0x1, 0xc208140090, 0x0, 0x0, 0xc208140090, 0x0, 0x45343f, ...) /usr/local/go/src/reflect/asm_amd64.s:29 +0x36 github.com/docker/docker/cli.(*Cli).Run(0xc208129fb0, 0xc20800a010, 0xe, 0xe, 0x0, 0x0) /go/src/github.com/docker/docker/cli/cli.go:89 +0x38e main.main() /go/src/github.com/docker/docker/docker/docker.go:69 +0x428 goroutine 5 [syscall]: os/signal.loop() /usr/local/go/src/os/signal/signal_unix.go:21 +0x1f created by os/signal.init·1 /usr/local/go/src/os/signal/signal_unix.go:27 +0x35 Signed-off-by: Derek Ch <denc716@gmail.com>		2015-10-13 15:58:06 -07:00
..
archive.go	archive, chrootarchive: split out decompression	2015-07-28 16:36:38 -04:00
archive_test.go	Windows: chrootarchive refactor	2015-05-20 08:56:42 -07:00
archive_unix.go	fix a race crash when building with "ADD some-broken.tar.xz ..."	2015-10-13 15:58:06 -07:00
archive_windows.go	Windows: Fix long path handling for docker build	2015-09-15 10:58:11 -07:00
diff.go	Add user namespace (mapping) support to the Docker engine	2015-10-09 17:47:37 -04:00
diff_unix.go	Add user namespace (mapping) support to the Docker engine	2015-10-09 17:47:37 -04:00
diff_windows.go	Add user namespace (mapping) support to the Docker engine	2015-10-09 17:47:37 -04:00
init_unix.go	Windows: Docker build starting to work	2015-06-17 10:41:28 -07:00
init_windows.go	Windows: Docker build starting to work	2015-06-17 10:41:28 -07:00