1 files changed, 0 insertions, 238 deletions
diff --git a/pkgs/build-support/build-fhs-userenv/chrootenv.c b/pkgs/build-support/build-fhs-userenv/chrootenv.c
deleted file mode 100644
index 43abf976bde..00000000000
--- a/pkgs/build-support/build-fhs-userenv/chrootenv.c
+++ /dev/null
@@ -1,238 +0,0 @@
-#define _GNU_SOURCE
-
-#include <errno.h>
-#include <error.h>
-
-#define errorf(status, fmt, ...)                                               \
-  error_at_line(status, errno, __FILE__, __LINE__, fmt, ##__VA_ARGS__)
-
-#include <dirent.h>
-#include <ftw.h>
-#include <sched.h>
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sysexits.h>
-#include <unistd.h>
-
-#include <sys/mount.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-
-#define LEN(x) (sizeof(x) / sizeof(*x))
-
-// TODO: fill together with @abbradar when he gets better
-const char *environ_blacklist[] = {};
-
-void environ_blacklist_filter() {
-  for (size_t i = 0; i < LEN(environ_blacklist); i++) {
-    if (unsetenv(environ_blacklist[i]) < 0)
-      errorf(EX_OSERR, "unsetenv(%s)", environ_blacklist[i]);
-  }
-}
-
-void bind(const char *from, const char *to) {
-  if (mkdir(to, 0755) < 0)
-    errorf(EX_IOERR, "mkdir(%s)", to);
-
-  if (mount(from, to, "bind", MS_BIND | MS_REC, NULL) < 0)
-    errorf(EX_OSERR, "mount(%s, %s)", from, to);
-}
-
-const char *bind_blacklist[] = {".", "..", "bin", "etc", "host", "usr"};
-
-bool str_contains(const char *needle, const char **haystack, size_t len) {
-  for (size_t i = 0; i < len; i++) {
-    if (!strcmp(needle, haystack[i]))
-      return true;
-  }
-
-  return false;
-}
-
-bool is_dir(const char *path) {
-  struct stat buf;
-
-  if (stat(path, &buf) < 0)
-    errorf(EX_IOERR, "stat(%s)", path);
-
-  return S_ISDIR(buf.st_mode);
-}
-
-void bind_to_cwd(const char *prefix) {
-  DIR *prefix_dir = opendir(prefix);
-
-  if (prefix_dir == NULL)
-    errorf(EX_IOERR, "opendir(%s)", prefix);
-
-  struct dirent *prefix_dirent;
-
-  while (prefix_dirent = readdir(prefix_dir)) {
-    if (str_contains(prefix_dirent->d_name, bind_blacklist,
-                     LEN(bind_blacklist)))
-      continue;
-
-    char *prefix_dirent_path;
-
-    if (asprintf(&prefix_dirent_path, "%s%s", prefix, prefix_dirent->d_name) <
-        0)
-      errorf(EX_IOERR, "asprintf");
-
-    if (is_dir(prefix_dirent_path)) {
-      bind(prefix_dirent_path, prefix_dirent->d_name);
-    } else {
-      char *host_target;
-
-      if (asprintf(&host_target, "host/%s", prefix_dirent->d_name) < 0)
-        errorf(EX_IOERR, "asprintf");
-
-      if (symlink(host_target, prefix_dirent->d_name) < 0)
-        errorf(EX_IOERR, "symlink(%s, %s)", host_target, prefix_dirent->d_name);
-
-      free(host_target);
-    }
-
-    free(prefix_dirent_path);
-  }
-
-  bind(prefix, "host");
-
-  if (closedir(prefix_dir) < 0)
-    errorf(EX_IOERR, "closedir(%s)", prefix);
-}
-
-void spitf(const char *path, char *fmt, ...) {
-  va_list args;
-  va_start(args, fmt);
-
-  FILE *f = fopen(path, "w");
-
-  if (f == NULL)
-    errorf(EX_IOERR, "spitf(%s): fopen", path);
-
-  if (vfprintf(f, fmt, args) < 0)
-    errorf(EX_IOERR, "spitf(%s): vfprintf", path);
-
-  if (fclose(f) < 0)
-    errorf(EX_IOERR, "spitf(%s): fclose", path);
-}
-
-int nftw_remove(const char *path, const struct stat *sb, int type,
-                struct FTW *ftw) {
-  return remove(path);
-}
-
-#define REQUIREMENTS                                                           \
-  "Requires Linux version >= 3.19 built with CONFIG_USER_NS option.\n"
-
-int main(int argc, char *argv[]) {
-  const char *self = *argv++;
-
-  if (argc < 2) {
-    fprintf(stderr, "Usage: %s command [arguments...]\n" REQUIREMENTS, self);
-    exit(EX_USAGE);
-  }
-
-  if (getenv("NIX_CHROOTENV") != NULL) {
-    fputs("Can't create chrootenv inside chrootenv!\n", stderr);
-    exit(EX_USAGE);
-  }
-
-  if (setenv("NIX_CHROOTENV", "1", false) < 0)
-    errorf(EX_OSERR, "setenv(NIX_CHROOTENV, 1)");
-
-  const char *temp = getenv("TMPDIR");
-
-  if (temp == NULL)
-    temp = "/tmp";
-
-  char *root;
-
-  if (asprintf(&root, "%s/chrootenvXXXXXX", temp) < 0)
-    errorf(EX_IOERR, "asprintf");
-
-  root = mkdtemp(root);
-
-  if (root == NULL)
-    errorf(EX_IOERR, "mkdtemp(%s)", root);
-
-  // Don't make root private so that privilege drops inside chroot are possible:
-  if (chmod(root, 0755) < 0)
-    errorf(EX_IOERR, "chmod(%s, 0755)", root);
-
-  pid_t cpid = fork();
-
-  if (cpid < 0)
-    errorf(EX_OSERR, "fork");
-
-  if (cpid == 0) {
-    uid_t uid = getuid();
-    gid_t gid = getgid();
-
-    // If we are root, no need to create new user namespace.
-    if (uid == 0) {
-      if (unshare(CLONE_NEWNS) < 0) {
-        fputs(REQUIREMENTS, stderr);
-        errorf(EX_OSERR, "unshare");
-      }
-      // Mark all mounted filesystems as slave so changes
-      // don't propagate to the parent mount namespace.
-      if (mount(NULL, "/", NULL, MS_REC | MS_SLAVE, NULL) < 0)
-        errorf(EX_OSERR, "mount");
-    } else {
-      // Create new mount and user namespaces. CLONE_NEWUSER
-      // requires a program to be non-threaded.
-      if (unshare(CLONE_NEWNS | CLONE_NEWUSER) < 0) {
-        fputs(access("/proc/sys/kernel/unprivileged_userns_clone", F_OK)
-                  ? REQUIREMENTS
-                  : "Run: sudo sysctl -w kernel.unprivileged_userns_clone=1\n",
-              stderr);
-        errorf(EX_OSERR, "unshare");
-      }
-
-      // Map users and groups to the parent namespace.
-      // setgroups is only available since Linux 3.19:
-      spitf("/proc/self/setgroups", "deny");
-
-      spitf("/proc/self/uid_map", "%d %d 1", uid, uid);
-      spitf("/proc/self/gid_map", "%d %d 1", gid, gid);
-    }
-
-    if (chdir(root) < 0)
-      errorf(EX_IOERR, "chdir(%s)", root);
-
-    bind_to_cwd("/");
-
-    if (chroot(root) < 0)
-      errorf(EX_OSERR, "chroot(%s)", root);
-
-    if (chdir("/") < 0)
-      errorf(EX_IOERR, "chdir(/)");
-
-    environ_blacklist_filter();
-
-    if (execvp(*argv, argv) < 0)
-      errorf(EX_OSERR, "execvp(%s)", *argv);
-  }
-
-  int status;
-
-  if (waitpid(cpid, &status, 0) < 0)
-    errorf(EX_OSERR, "waitpid(%d)", cpid);
-
-  if (nftw(root, nftw_remove, getdtablesize(),
-           FTW_DEPTH | FTW_MOUNT | FTW_PHYS) < 0)
-    errorf(EX_IOERR, "nftw(%s)", root);
-
-  free(root);
-
-  if (WIFEXITED(status)) {
-    return WEXITSTATUS(status);
-  } else if (WIFSIGNALED(status)) {
-    kill(getpid(), WTERMSIG(status));
-  }
-
-  return EX_OSERR;
-}