ci: skip unavailable external software

The ci/install-dependencies.sh script used in a very early phase of
our CI jobs downloads Perforce, Git-LFS, and JGit, used for running
the test scripts.  The test framework is prepared to properly skip
the tests that depend on these external software, but the CI script
is unnecessarily strict (due to its use of "set -e" in ci/lib.sh)
and fails the entire CI run before even starting to test the rest of
the system.

Notice a failure to download to any of these external software, but
keep going.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

ci/install-dependencies.sh

@@ -66,16 +66,22 @@ ubuntu-*|i386/ubuntu-*|debian-*)
 		mkdir --parents "$CUSTOM_PATH"
 
 		wget --quiet --directory-prefix="$CUSTOM_PATH" \
-			"$P4WHENCE/bin.linux26x86_64/p4d" "$P4WHENCE/bin.linux26x86_64/p4"
-		chmod a+x "$CUSTOM_PATH/p4d" "$CUSTOM_PATH/p4"
+			"$P4WHENCE/bin.linux26x86_64/p4d" \
+			"$P4WHENCE/bin.linux26x86_64/p4" &&
+		chmod a+x "$CUSTOM_PATH/p4d" "$CUSTOM_PATH/p4" ||
+		echo >&2 "P4 download (optional) failed"
 
-		wget --quiet "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
+		wget --quiet \
+		     "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz" &&
 		tar -xzf "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz" \
-			-C "$CUSTOM_PATH" --strip-components=1 "git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs"
-		rm "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
-
-		wget --quiet "$JGITWHENCE" --output-document="$CUSTOM_PATH/jgit"
-		chmod a+x "$CUSTOM_PATH/jgit"
+			-C "$CUSTOM_PATH" --strip-components=1 \
+			"git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs" &&
+		rm "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz" ||
+		echo >&2 "LFS download (optional) failed"
+
+		wget --quiet "$JGITWHENCE" --output-document="$CUSTOM_PATH/jgit" &&
+		chmod a+x "$CUSTOM_PATH/jgit" ||
+		echo >&2 "JGit download (optional) failed"
 		;;
 	esac
 	;;