The built package doesn't seem to pass PGP signatures at docker-git 1:1.1.2.dev.9869.042b642-1. I just ran the commands below and got that log ouput; please let me know if I'm somehow doing anything wrong here.
~/aur$ wget https://aur.archlinux.org/packages/do/docker-git/docker-git.tar.gz
docker-git.tar.gz 100%[========================================================================================================>] 2.60K --.-KB/s in 0s
2014-12-12 18:27:00 (72.5 MB/s) - ‘docker-git.tar.gz’ saved [2664/2664]
~/aur$ tar xzfv docker-git.tar.gz
docker-git/
docker-git/.AURINFO
docker-git/docker.service
docker-git/docker.conf
docker-git/docker.install
docker-git/PKGBUILD
docker-git/docker-nocheck.patch
~/aur$ cd docker-git
~/aur/docker-git$ makepkg -s
==> Making package: docker-git 1:1.1.2.dev.9869.042b642-1 (Fri Dec 12 18:27:07 CET 2014)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
-> Cloning docker git repo...
Cloning into bare repository '/home/zero/aur/docker-git/docker'...
remote: Counting objects: 93452, done.
remote: Compressing objects: 100% (30616/30616), done.
remote: Total 93452 (delta 61369), reused 93261 (delta 61227)
Receiving objects: 100% (93452/93452), 49.08 MiB | 1.71 MiB/s, done.
Resolving deltas: 100% (61369/61369), done.
Checking connectivity... done.
-> Found docker.service
-> Found docker.install
-> Found docker-nocheck.patch
-> Found docker.conf
==> Validating source files with md5sums...
docker ... Skipped
docker.service ... Passed
docker.install ... Passed
docker-nocheck.patch ... Passed
docker.conf ... Passed
==> Extracting sources...
-> Creating working copy of docker git repo...
Cloning into 'docker'...
done.
==> Starting pkgver()...
==> Updated version: docker-git 1:1.4.0.dev.12103.c60e60a-1
==> Starting prepare()...
patching file daemon/daemon.go
Hunk #1 succeeded at 1114 (offset -63 lines).
==> Starting build()...
# WARNING! I don't seem to be running in the Docker container.
# The result of this command might be an incorrect build, and will not be
# officially supported.
#
# Try this instead: make all
#
---> Making bundle: dynbinary (in bundles/1.4.0-dev/dynbinary)
# _/home/zero/aur/docker-git/src/docker/dockerinit
/var/tmp/go-link-zS1Dbt/000004.o: In function `_cgo_632c88804cec_C2func_getaddrinfo':
/build/go/src/go-1.4/src/net/cgo_unix.go:54: warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
Created binary: /home/zero/aur/docker-git/src/docker/bundles/1.4.0-dev/dynbinary/dockerinit-1.4.0-dev
Created binary: /home/zero/aur/docker-git/src/docker/bundles/1.4.0-dev/dynbinary/docker-1.4.0-dev
==> Entering fakeroot environment...
==> Starting package()...
==> Tidying install...
-> Purging unwanted files...
-> Removing libtool files...
-> Removing static library files...
-> Compressing man and info pages...
==> Creating package "docker-git"...
-> Generating .PKGINFO file...
-> Adding install file...
-> Generating .MTREE file...
-> Compressing package...
==> Leaving fakeroot environment.
==> Finished making: docker-git 1:1.4.0.dev.12103.c60e60a-1 (Fri Dec 12 18:29:25 CET 2014)
~/aur/docker-git$ sudo pacman -U docker-git-1\:1.4.0.dev.12103.c60e60a-1-i686.pkg.tar.xz
[sudo] password for zero:
loading packages...
error: 'docker-git-1:1.4.0.dev.12103.c60e60a-1-i686.pkg.tar.xz': invalid or corrupted package (PGP signature)