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switch_root: more clear error messages

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-12-15 01:55:55 +01:00
parent 4e60f304d4
commit cb37637b47
1 changed files with 6 additions and 4 deletions
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10
util-linux/switch_root.c
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@ -85,12 +85,14 @@ int switch_root_main(int argc UNUSED_PARAM, char **argv)
// Additional sanity checks: we're about to rm -rf /, so be REALLY SURE
// we mean it. I could make this a CONFIG option, but I would get email
// from all the people who WILL destroy their filesystems.
if (stat("/init", &st) != 0 || !S_ISREG(st.st_mode)) {
bb_error_msg_and_die("/init is not a regular file");
}
statfs("/", &stfs); // this never fails
if (stat("/init", &st) != 0 || !S_ISREG(st.st_mode)
|| ((unsigned)stfs.f_type != RAMFS_MAGIC
&& (unsigned)stfs.f_type != TMPFS_MAGIC)
if ((unsigned)stfs.f_type != RAMFS_MAGIC
&& (unsigned)stfs.f_type != TMPFS_MAGIC
) {
bb_error_msg_and_die("not rootfs");
bb_error_msg_and_die("root filesystem is not ramfs/tmpfs");
}
// Zap everything out of rootdev