Merge branch 'sg/travis-linux32-sanity'

Travis updates.

* sg/travis-linux32-sanity:
  travis-ci: don't fail if user already exists on 32 bit Linux build job
  travis-ci: don't run the test suite as root in the 32 bit Linux build
  travis-ci: don't repeat the path of the cache directory
  travis-ci: use 'set -e' in the 32 bit Linux build job
  travis-ci: use 'set -x' for the commands under 'su' in the 32 bit Linux build

ci/lib-travisci.sh

@@ -21,8 +21,6 @@ skip_branch_tip_with_tag () {
 	fi
 }
 
-good_trees_file="$HOME/travis-cache/good-trees"
-
 # Save some info about the current commit's tree, so we can skip the build
 # job if we encounter the same tree again and can provide a useful info
 # message.
@@ -83,7 +81,10 @@ check_unignored_build_artifacts ()
 # and installing dependencies.
 set -ex
 
-mkdir -p "$HOME/travis-cache"
+cache_dir="$HOME/travis-cache"
+good_trees_file="$cache_dir/good-trees"
+
+mkdir -p "$cache_dir"
 
 skip_branch_tip_with_tag
 skip_good_tree

ci/run-linux32-build.sh

@@ -3,31 +3,58 @@
 # Build and test Git in a 32-bit environment
 #
 # Usage:
-#   run-linux32-build.sh [host-user-id]
+#   run-linux32-build.sh <host-user-id>
 #
 
-set -x
+set -ex
+
+if test $# -ne 1 || test -z "$1"
+then
+	echo >&2 "usage: run-linux32-build.sh <host-user-id>"
+	exit 1
+fi
 
 # Update packages to the latest available versions
 linux32 --32bit i386 sh -c '
     apt update >/dev/null &&
     apt install -y build-essential libcurl4-openssl-dev libssl-dev \
 	libexpat-dev gettext python >/dev/null
-' &&
+'
 
 # If this script runs inside a docker container, then all commands are
 # usually executed as root. Consequently, the host user might not be
 # able to access the test output files.
-# If a host user id is given, then create a user "ci" with the host user
-# id to make everything accessible to the host user.
-HOST_UID=$1 &&
-CI_USER=$USER &&
-test -z $HOST_UID || (CI_USER="ci" && useradd -u $HOST_UID $CI_USER) &&
+# If a non 0 host user id is given, then create a user "ci" with that
+# user id to make everything accessible to the host user.
+HOST_UID=$1
+if test $HOST_UID -eq 0
+then
+	# Just in case someone does want to run the test suite as root.
+	CI_USER=root
+else
+	CI_USER=ci
+	if test "$(id -u $CI_USER 2>/dev/null)" = $HOST_UID
+	then
+		echo "user '$CI_USER' already exists with the requested ID $HOST_UID"
+	else
+		useradd -u $HOST_UID $CI_USER
+	fi
+
+	# Due to a bug the test suite was run as root in the past, so
+	# a prove state file created back then is only accessible by
+	# root.  Now that bug is fixed, the test suite is run as a
+	# regular user, but the prove state file coming from Travis
+	# CI's cache might still be owned by root.
+	# Make sure that this user has rights to any cached files,
+	# including an existing prove state file.
+	test -n "$cache_dir" && chown -R $HOST_UID:$HOST_UID "$cache_dir"
+fi
 
 # Build and test
 linux32 --32bit i386 su -m -l $CI_USER -c '
-    cd /usr/src/git &&
-    ln -s /tmp/travis-cache/.prove t/.prove &&
-    make --jobs=2 &&
-    make --quiet test
+	set -ex
+	cd /usr/src/git
+	test -n "$cache_dir" && ln -s "$cache_dir/.prove" t/.prove
+	make --jobs=2
+	make --quiet test
 '

ci/run-linux32-docker.sh

@@ -9,7 +9,9 @@ docker pull daald/ubuntu32:xenial
 
 # Use the following command to debug the docker build locally:
 # $ docker run -itv "${PWD}:/usr/src/git" --entrypoint /bin/bash daald/ubuntu32:xenial
-# root@container:/# /usr/src/git/ci/run-linux32-build.sh
+# root@container:/# /usr/src/git/ci/run-linux32-build.sh <host-user-id>
+
+container_cache_dir=/tmp/travis-cache
 
 docker run \
 	--interactive \
@@ -18,8 +20,9 @@ docker run \
 	--env GIT_PROVE_OPTS \
 	--env GIT_TEST_OPTS \
 	--env GIT_TEST_CLONE_2GB \
+	--env cache_dir="$container_cache_dir" \
 	--volume "${PWD}:/usr/src/git" \
-	--volume "${HOME}/travis-cache:/tmp/travis-cache" \
+	--volume "$cache_dir:$container_cache_dir" \
 	daald/ubuntu32:xenial \
 	/usr/src/git/ci/run-linux32-build.sh $(id -u $USER)
 

ci/run-tests.sh

@@ -5,7 +5,8 @@
 
 . ${0%/*}/lib-travisci.sh
 
-ln -s $HOME/travis-cache/.prove t/.prove
+ln -s "$cache_dir/.prove" t/.prove
+
 make --quiet test
 if test "$jobname" = "linux-gcc"
 then