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