-# create a library to noop chroot() and rewrite maintainer script executions
-# via execvp() as used by dpkg as we don't want our rootdir to be a fullblown
-# chroot directory dpkg could chroot into to execute the maintainer scripts
-cat << EOF > noopchroot.c
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <dlfcn.h>
-
-static char * chrootdir = NULL;
-
-int chroot(const char *path) {
- printf("WARNING: CHROOTing to %s was ignored!\n", path);
- free(chrootdir);
- chrootdir = strdup(path);
- return 0;
-}
-int execvp(const char *file, char *const argv[]) {
- static int (*func_execvp) (const char *, char * const []) = NULL;
- if (func_execvp == NULL)
- func_execvp = (int (*) (const char *, char * const [])) dlsym(RTLD_NEXT, "execvp");
- if (chrootdir == NULL || strncmp(file, "/var/lib/dpkg/", strlen("/var/lib/dpkg/")) != 0)
- return func_execvp(file, argv);
- printf("REWRITE execvp call %s into %s\n", file, chrootdir);
- char newfile[strlen(chrootdir) + strlen(file)];
- strcpy(newfile, chrootdir);
- strcat(newfile, file);
- return func_execvp(newfile, argv);
-}
-EOF
-testsuccess gcc -fPIC -shared -o noopchroot.so noopchroot.c -ldl
-
-mkdir -p "${TMPWORKINGDIRECTORY}/rootdir/usr/bin/"
-DPKG="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/dpkg"
-echo "#!/bin/sh
-if [ -n \"\$LD_PRELOAD\" ]; then
- export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so \${LD_PRELOAD}\"
-else
- export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so\"
-fi
-dpkg \"\$@\"" > $DPKG
-chmod +x $DPKG
-sed -ie "s|^DPKG::options:: \"dpkg\";\$|DPKG::options:: \"$DPKG\";|" aptconfig.conf
-