merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 75 insertions, 0 deletions

diff --git a/third_party/git/ci/run-docker-build.sh b/third_party/git/ci/run-docker-build.sh
new file mode 100755
index 0000000000..8d47a5fda3
--- /dev/null
+++ b/third_party/git/ci/run-docker-build.sh
@@ -0,0 +1,75 @@
+#!/bin/sh
+#
+# Build and test Git inside container
+#
+# Usage:
+#   run-docker-build.sh <host-user-id>
+#
+
+set -ex
+
+if test $# -ne 1 || test -z "$1"
+then
+	echo >&2 "usage: run-docker-build.sh <host-user-id>"
+	exit 1
+fi
+
+case "$jobname" in
+Linux32)
+	switch_cmd="linux32 --32bit i386"
+	;;
+linux-musl)
+	switch_cmd=
+	useradd () { adduser -D "$@"; }
+	;;
+*)
+	exit 1
+	;;
+esac
+
+"${0%/*}/install-docker-dependencies.sh"
+
+# 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 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
+command $switch_cmd su -m -l $CI_USER -c "
+	set -ex
+	export DEVELOPER='$DEVELOPER'
+	export DEFAULT_TEST_TARGET='$DEFAULT_TEST_TARGET'
+	export GIT_PROVE_OPTS='$GIT_PROVE_OPTS'
+	export GIT_TEST_OPTS='$GIT_TEST_OPTS'
+	export GIT_TEST_CLONE_2GB='$GIT_TEST_CLONE_2GB'
+	export MAKEFLAGS='$MAKEFLAGS'
+	export cache_dir='$cache_dir'
+	cd /usr/src/git
+	test -n '$cache_dir' && ln -s '$cache_dir/.prove' t/.prove
+	make
+	make test
+"