Merge branch 'backport/jx/ci-ubuntu-fix' into maint-2.30

Adjust the GitHub CI to newer ubuntu release.

* jx/ci-ubuntu-fix:
  github-actions: run gcc-8 on ubuntu-20.04 image
  ci: install python on ubuntu
  ci: use the same version of p4 on both Linux and macOS
  ci: remove the pipe after "p4 -V" to catch errors

Author: gitster

.github/workflows/main.yml

@@ -282,7 +282,7 @@ jobs:
             pool: ubuntu-latest
           - jobname: linux-gcc
             cc: gcc
-            pool: ubuntu-latest
+            pool: ubuntu-20.04
           - jobname: osx-clang
             cc: clang
             pool: macos-latest

ci/install-dependencies.sh

@@ -5,7 +5,7 @@
 
 . ${0%/*}/lib.sh
 
-P4WHENCE=http://filehost.perforce.com/perforce/r$LINUX_P4_VERSION
+P4WHENCE=https://cdist2.perforce.com/perforce/r21.2
 LFSWHENCE=https://github.com/github/git-lfs/releases/download/v$LINUX_GIT_LFS_VERSION
 UBUNTU_COMMON_PKGS="make libssl-dev libcurl4-openssl-dev libexpat-dev
  tcl tk gettext zlib1g-dev perl-modules liberror-perl libauthen-sasl-perl
@@ -16,7 +16,7 @@ linux-clang|linux-gcc)
 	sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
 	sudo apt-get -q update
 	sudo apt-get -q -y install language-pack-is libsvn-perl apache2 \
-		$UBUNTU_COMMON_PKGS
+		$UBUNTU_COMMON_PKGS $PYTHON_PACKAGE
 	case "$jobname" in
 	linux-gcc)
 		sudo apt-get -q -y install gcc-8
@@ -44,13 +44,15 @@ osx-clang|osx-gcc)
 	test -z "$BREW_INSTALL_PACKAGES" ||
 	brew install $BREW_INSTALL_PACKAGES
 	brew link --force gettext
-	brew install --cask --no-quarantine perforce || {
-		# Update the definitions and try again
-		cask_repo="$(brew --repository)"/Library/Taps/homebrew/homebrew-cask &&
-		git -C "$cask_repo" pull --no-stat --ff-only &&
-		brew install --cask --no-quarantine perforce
-	} ||
-	brew install homebrew/cask/perforce
+	mkdir -p $HOME/bin
+	(
+		cd $HOME/bin
+		wget -q "$P4WHENCE/bin.macosx1015x86_64/helix-core-server.tgz" &&
+		tar -xf helix-core-server.tgz &&
+		sudo xattr -d com.apple.quarantine p4 p4d 2>/dev/null || true
+	)
+	PATH="$PATH:${HOME}/bin"
+	export PATH
 	case "$jobname" in
 	osx-gcc)
 		brew install gcc@9
@@ -81,9 +83,9 @@ esac
 if type p4d >/dev/null && type p4 >/dev/null
 then
 	echo "$(tput setaf 6)Perforce Server Version$(tput sgr0)"
-	p4d -V | grep Rev.
+	p4d -V
 	echo "$(tput setaf 6)Perforce Client Version$(tput sgr0)"
-	p4 -V | grep Rev.
+	p4 -V
 fi
 if type git-lfs >/dev/null
 then

ci/lib.sh

@@ -184,13 +184,13 @@ export SKIP_DASHED_BUILT_INS=YesPlease
 
 case "$jobname" in
 linux-clang|linux-gcc)
+	PYTHON_PACKAGE=python2
 	if [ "$jobname" = linux-gcc ]
 	then
 		export CC=gcc-8
-		MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/python3"
-	else
-		MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/python2"
+		PYTHON_PACKAGE=python3
 	fi
+	MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/$PYTHON_PACKAGE"
 
 	export GIT_TEST_HTTPD=true
 
@@ -199,7 +199,6 @@ linux-clang|linux-gcc)
 	# were recorded in the Homebrew database upon creating the OS X
 	# image.
 	# Keep that in mind when you encounter a broken OS X build!
-	export LINUX_P4_VERSION="16.2"
 	export LINUX_GIT_LFS_VERSION="1.5.2"
 
 	P4_PATH="$HOME/custom/p4"