Embed license and add -l flag to show it

This adds 1k of weight to the resulting binary, which is reasonable
(it's less than 5% for the smaller non-static binary), but alleviates
legitimate user concern that the license requires being included when
Tini is redistributed.

.travis.yml

@@ -24,6 +24,7 @@ addons:
     - python-virtualenv
     - hardening-includes
     - gnupg
+    - vim-common
 
 env:
   global:

CMakeLists.txt

@@ -51,6 +51,16 @@ set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-Bsymbolic-functions
 
 # Build
 
+execute_process(
+  COMMAND xxd -i "LICENSE" "${PROJECT_BINARY_DIR}/tiniLicense.h"
+  WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+  RESULT_VARIABLE xxd_ret
+)
+
+if(NOT "${xxd_ret}" EQUAL 0)
+	message(SEND_ERROR "xxd on LICENSE failed: ${xxd_ret}")
+endif()
+
 configure_file (
 	"${PROJECT_SOURCE_DIR}/src/tiniConfig.h.in"
 	"${PROJECT_BINARY_DIR}/tiniConfig.h"

Dockerfile

@@ -1,7 +1,7 @@
 FROM ubuntu:precise
 
 RUN apt-get update \
- && apt-get install --no-install-recommends --yes build-essential git gdb valgrind cmake rpm python-dev libcap-dev python-pip python-virtualenv hardening-includes gnupg \
+ && apt-get install --no-install-recommends --yes build-essential git gdb valgrind cmake rpm python-dev libcap-dev python-pip python-virtualenv hardening-includes gnupg vim-common \
  && rm -rf /var/lib/apt/lists/*
 
 # Pre-install those here for faster local builds.

ci/run_build.sh

@@ -2,6 +2,7 @@
 # Should be run from the root dir, or SOURCE_DIR should be set.
 set -o errexit
 set -o nounset
+set -o pipefail
 
 # Default compiler
 : ${CC:="gcc"}
@@ -54,6 +55,9 @@ for tini in "${BUILD_DIR}/tini" "${BUILD_DIR}/tini-static"; do
   echo "Smoke test for $tini"
   "${tini}" -h
 
+  echo "Testing $tini for license"
+  "${tini}" -l | grep -i "mit license"
+
   echo "Testing $tini with: true"
   "${tini}" -vvv true
 

src/tini.c

@@ -15,6 +15,7 @@
 #include <stdbool.h>
 
 #include "tiniConfig.h"
+#include "tiniLicense.h"
 
 #define PRINT_FATAL(...)                         fprintf(stderr, "[FATAL tini (%i)] ", getpid()); fprintf(stderr, __VA_ARGS__); fprintf(stderr, "\n");
 #define PRINT_WARNING(...)  if (verbosity > 0) { fprintf(stderr, "[WARN  tini (%i)] ", getpid()); fprintf(stderr, __VA_ARGS__); fprintf(stderr, "\n"); }
@@ -33,11 +34,11 @@ typedef struct {
 
 #ifdef PR_SET_CHILD_SUBREAPER
 #define HAS_SUBREAPER 1
-#define OPT_STRING "hsvg"
+#define OPT_STRING "hsvgl"
 #define SUBREAPER_ENV_VAR "TINI_SUBREAPER"
 #else
 #define HAS_SUBREAPER 0
-#define OPT_STRING "hvg"
+#define OPT_STRING "hvgl"
 #endif
 
 
@@ -151,9 +152,14 @@ void print_usage(char* const name, FILE* const file) {
 #endif
 	fprintf(file, "  -v: Generate more verbose output. Repeat up to 3 times.\n");
 	fprintf(file, "  -g: Send signals to the child's process group.\n");
+	fprintf(file, "  -l: Show license and exit.\n");
 	fprintf(file, "\n");
 }
 
+void print_license(FILE* const file) {
+	fwrite(LICENSE, sizeof(char), LICENSE_len, file);
+}
+
 
 int parse_args(const int argc, char* const argv[], char* (**child_args_ptr_ptr)[], int* const parse_fail_exitcode_ptr) {
 	char* name = argv[0];
@@ -179,6 +185,11 @@ int parse_args(const int argc, char* const argv[], char* (**child_args_ptr_ptr)[
 				kill_process_group++;
 				break;
 
+			case 'l':
+				print_license(stdout);
+				*parse_fail_exitcode_ptr = 0;
+				return 1;
+
 			case '?':
 				print_usage(name, stderr);
 				return 1;

tpl/travis.yml.tpl

@@ -24,6 +24,7 @@ addons:
     - python-virtualenv
     - hardening-includes
     - gnupg
+    - vim-common
 
 env:
   global: