Merge branch 'jc/ci-skip-unavailable-external-software'

Make sure outage of third-party sites that supply P4, Git-LFS, and JGit
we use for testing would not prevent our CI jobs from running at all.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

ci/install-dependencies.sh

@@ -66,16 +66,29 @@ 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" "$CUSTOM_PATH/p4"
-
-		wget --quiet "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
+			"$P4WHENCE/bin.linux26x86_64/p4d" \
+			"$P4WHENCE/bin.linux26x86_64/p4" &&
+		chmod a+x "$CUSTOM_PATH/p4d" "$CUSTOM_PATH/p4" || {
+			rm -f "$CUSTOM_PATH/p4"
+			rm -f "$CUSTOM_PATH/p4d"
+			echo >&2 "P4 download (optional) failed"
+		}
+
+		wget --quiet \
+		     "$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-$LINUX_GIT_LFS_VERSION.tar.gz" || {
+			rm -f "$CUSTOM_PATH/git-lfs"
+			echo >&2 "LFS download (optional) failed"
+		}
+
+		wget --quiet "$JGITWHENCE" --output-document="$CUSTOM_PATH/jgit" &&
+		chmod a+x "$CUSTOM_PATH/jgit" || {
+			rm -f "$CUSTOM_PATH/jgit"
+			echo >&2 "JGit download (optional) failed"
+		}
 		;;
 	esac
 	;;