Build external dependencies local to tree

2018-12-03 00:04:18 -08:00
parent 4632d11a1e
commit 1768bdaa4c
13 changed files with 238 additions and 104 deletions
@@ -0,0 +1,21 @@
+COMPILER=../02-extract/raspbian9/bin/arm-raspbian9-linux-gnueabihf-
+
+ALL: setuidgids _cscore.so
+
+setuidgids: setuidgids.c
+	${COMPILER}gcc -O -Wall -D_GNU_SOURCE -o $@ $<
+
+_cscore.so: ../robotpy-cscore/src/_cscore.cpp ../robotpy-cscore/src/ndarray_converter.cpp
+	${COMPILER}g++ -O -Wall -fvisibility=hidden -shared -fPIC -o $@ \
+	    -I../03-build/opencv-build/install/include \
+	    -I../allwpilib/wpiutil/src/main/native/include \
+	    -I../allwpilib/cscore/src/main/native/include \
+	    -I../02-extract/raspbian9/arm-raspbian9-linux-gnueabihf/usr/include/python3.5 \
+	    -L../allwpilib/cscore/build/libs/cscore/shared/release \
+	    -L../allwpilib/wpiutil/build/libs/wpiutil/shared/release \
+	    -L../03-build/opencv-build/install/lib \
+	    ../robotpy-cscore/src/_cscore.cpp \
+	    ../robotpy-cscore/src/ndarray_converter.cpp \
+	    -lcscore \
+	    -lwpiutil \
+	    -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_core
@@ -0,0 +1,47 @@
+#include <sys/types.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int prot_gid(gid_t gid)
+{
+  if (setgroups(1,&gid) == -1) return -1;
+  return setgid(gid); /* _should_ be redundant, but on some systems it isn't */
+}
+
+const char *account;
+struct passwd *pw;
+
+int main(int argc, char **argv, char **envp)
+{
+  account = *++argv;
+  if (!account || !*++argv) {
+    fprintf(stderr, "setuidgids: usage: setuidgids account child");
+    exit(EXIT_FAILURE);
+  }
+
+  pw = getpwnam(account);
+  if (!pw) {
+    fprintf(stderr, "setuidgids: FATAL: unknown account %s", account);
+    return EXIT_FAILURE;
+  }
+
+  if (prot_gid(pw->pw_gid) == -1) {
+    fprintf(stderr, "setuidgids: FATAL: unable to setgid\n");
+    return EXIT_FAILURE;
+  }
+  if (initgroups(pw->pw_name, pw->pw_gid) == -1) {
+    fprintf(stderr, "setuidgids: FATAL: unable to initgroups\n");
+    return EXIT_FAILURE;
+  }
+  if (setuid(pw->pw_uid) == -1) {
+    fprintf(stderr, "setuidgids: FATAL: unable to setuid\n");
+    return EXIT_FAILURE;
+  }
+
+  execvpe(*argv,argv,envp);
+  fprintf(stderr, "setuidgids: FATAL: unable to run %s\n", *argv);
+  return EXIT_FAILURE;
+}