#!/bin/sh # Test df's behavior when the mount list contains duplicate entries. # This test is skipped on systems that lack LD_PRELOAD support; that's fine. # Copyright (C) 2012-2014 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program. If not, see . . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src print_ver_ df require_gcc_shared_ # We use --local here so as to not activate # potentially very many remote mounts. df --local || skip_ "df fails" export CU_NONROOT_FS=$(df --local --output=target 2>&1 | grep /. | head -n1) export CU_REMOTE_FS=$(df --local --output=target 2>&1 | grep /. | tail -n+2 | head -n1) unique_entries=1 test -z "$CU_NONROOT_FS" || unique_entries=$(expr $unique_entries + 1) test -z "$CU_REMOTE_FS" || unique_entries=$(expr $unique_entries + 2) grep '^#define HAVE_MNTENT_H 1' $CONFIG_HEADER > /dev/null \ || skip_ "no mntent.h available to confirm the interface" grep '^#define HAVE_GETMNTENT 1' $CONFIG_HEADER > /dev/null \ || skip_ "getmntent is not used on this system" # Simulate an mtab file to test various cases. cat > k.c <<'EOF' || framework_failure_ #include #include #include #include #define STREQ(a, b) (strcmp (a, b) == 0) struct mntent *getmntent (FILE *fp) { static char *nonroot_fs; static char *remote_fs; static int done; /* Prove that LD_PRELOAD works. */ if (!done) { fclose (fopen ("x", "w")); ++done; } static struct mntent mntents[] = { {.mnt_fsname="/short", .mnt_dir="/invalid/mount/dir"}, {.mnt_fsname="fsname", .mnt_dir="/",}, {.mnt_fsname="/fsname", .mnt_dir="/."}, {.mnt_fsname="/fsname", .mnt_dir="/"}, {.mnt_fsname="virtfs", .mnt_dir="/NONROOT", .mnt_type="fstype1"}, {.mnt_fsname="virtfs2", .mnt_dir="/NONROOT", .mnt_type="fstype2"}, {.mnt_fsname="netns", .mnt_dir="net:[1234567]"}, {.mnt_fsname="rem:ote1",.mnt_dir="/REMOTE"}, {.mnt_fsname="rem:ote1",.mnt_dir="/REMOTE"}, {.mnt_fsname="rem:ote2",.mnt_dir="/REMOTE"}, }; if (done == 1) { nonroot_fs = getenv ("CU_NONROOT_FS"); if (!nonroot_fs || !*nonroot_fs) nonroot_fs = "/"; /* merge into / entries. */ remote_fs = getenv ("CU_REMOTE_FS"); } if (done == 1 && !getenv ("CU_TEST_DUPE_INVALID")) done++; /* skip the first entry. */ while (done++ <= 10) { if (!mntents[done-2].mnt_type) mntents[done-2].mnt_type = "-"; if (STREQ (mntents[done-2].mnt_dir, "/NONROOT")) mntents[done-2].mnt_dir = nonroot_fs; if (STREQ (mntents[done-2].mnt_dir, "/REMOTE")) { if (!remote_fs || !*remote_fs) continue; else mntents[done-2].mnt_dir = remote_fs; } return &mntents[done-2]; } return NULL; } EOF # Then compile/link it: gcc_shared_ k.c k.so \ || framework_failure_ 'failed to build shared library' # Test if LD_PRELOAD works: LD_PRELOAD=./k.so df test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?" # The fake mtab file should only contain entries # having the same device number; thus the output should # consist of a header and unique entries. LD_PRELOAD=./k.so df -T >out || fail=1 test $(wc -l out || fail=1 test "$CU_REMOTE_FS" && elide_remote=1 || elide_remote=0 test $(wc -l out || fail=1 test $(wc -l out || fail=1 total_fs=6; test "$CU_REMOTE_FS" && total_fs=$(expr $total_fs + 3) test $(wc -l out || fail=1 test $(wc -l