packaging: consistently create build user in Dockerfiles

packaging: consistently create build user in Dockerfiles

Previously, dockerlib.sh appended some commands to create a
"build" user in each Docker image. The resulting Docker images
could be inconsistent depending on the execution environment
and base image.

With this change, we explicitly create our custom user and
group as the first action in each Dockerfile. The user always
has user:group 1000:1000 and all built images are consistent.

We also create a home directory for the user under /build.
This directory is currently ignored.

As part of this, we stop setting the DBUILDUSER variable in
dockerlib.sh and instead set it in the respective scripts that
call it. This is in preparation for further refactoring of
dockerlib.sh.

Differential Revision: https://phab.mercurial-scm.org/D3758

--- a/contrib/packaging/docker/centos5	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/centos5	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM centos:centos5
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN \
 	sed -i 's/^mirrorlist/#mirrorlist/' /etc/yum.repos.d/*.repo && \
 	sed -i 's/^#\(baseurl=\)http:\/\/mirror.centos.org\/centos/\1http:\/\/vault.centos.org/' /etc/yum.repos.d/*.repo && \

--- a/contrib/packaging/docker/centos6	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/centos6	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM centos:centos6
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN yum install -y \
 	gcc \
 	gettext \

--- a/contrib/packaging/docker/centos7	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/centos7	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM centos:centos7
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN yum install -y \
 	gcc \
 	gettext \

--- a/contrib/packaging/docker/debian.template	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/debian.template	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM debian:__CODENAME__
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN apt-get update && apt-get install -y \
   build-essential \
   debhelper \

--- a/contrib/packaging/docker/fedora20	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/fedora20	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM fedora:20
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN yum install -y \
 	gcc \
 	gettext \

--- a/contrib/packaging/docker/fedora21	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/fedora21	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM fedora:21
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN yum install -y \
 	gcc \
 	gettext \

--- a/contrib/packaging/docker/ubuntu.template	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/docker/ubuntu.template	Sat May 12 15:51:37 2018 -0700
@@ -1,4 +1,8 @@
 FROM ubuntu:__CODENAME__
+
+RUN groupadd -g 1000 build && \
+    useradd -u 1000 -g 1000 -s /bin/bash -d /build -m build
+
 RUN apt-get update && apt-get install -y \
   build-essential \
   debhelper \

--- a/contrib/packaging/dockerdeb	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/dockerdeb	Sat May 12 15:51:37 2018 -0700
@@ -22,6 +22,8 @@
 # container and hope it's writable. Whee.
 dn=$(basename $ROOTDIR)
 
+DBUILDUSER=build
+
 if [ $(uname) = "Darwin" ] ; then
     $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
             sh -c "cd /mnt/$dn && make clean && make local"

--- a/contrib/packaging/dockerlib.sh	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/dockerlib.sh	Sat May 12 15:51:37 2018 -0700
@@ -26,17 +26,5 @@
   [ -f "$DFILE" ] || { echo "Error: docker file $DFILE not found"; exit 1; }
 
   CONTAINER="hg-dockerrpm-$1"
-  DBUILDUSER=build
-  (
-    cat $DFILE
-    if [ $(uname) = "Darwin" ] ; then
-        # The builder is using boot2docker on OS X, so we're going to
-        # *guess* the uid of the user inside the VM that is actually
-        # running docker. This is *very likely* to fail at some point.
-        echo RUN useradd $DBUILDUSER -u 1000
-    else
-        echo RUN groupadd $DBUILDUSER -g `id -g` -o
-        echo RUN useradd $DBUILDUSER -u `id -u` -g $DBUILDUSER -o
-    fi
-  ) | $DOCKER build --build-arg http_proxy --build-arg https_proxy --tag $CONTAINER -
+  cat $DFILE | $DOCKER build --build-arg http_proxy --build-arg https_proxy --tag $CONTAINER -
 }

--- a/contrib/packaging/dockerrpm	Fri Jun 15 00:50:48 2018 +0530
+++ b/contrib/packaging/dockerrpm	Sat May 12 15:51:37 2018 -0700
@@ -16,6 +16,8 @@
 $ROOTDIR/contrib/packaging/buildrpm --rpmbuilddir $RPMBUILDDIR --prepare $*
 
 DSHARED=/mnt/shared
+DBUILDUSER=build
+
 $DOCKER run -e http_proxy -e https_proxy -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
     rpmbuild --define "_topdir $DSHARED" -ba $DSHARED/SPECS/mercurial.spec --clean