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catar/encoder.rs: store fat file system attributes

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This commit is contained in:
Dietmar Maurer 2019-01-11 10:18:22 +01:00
parent 8c1dfa6c72
commit 5c76c2f331
2 changed files with 58 additions and 17 deletions
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51
src/catar/encoder.rs
View File

@ -139,11 +139,37 @@ impl <'a, W: Write> CaTarEncoder<'a, W> {
fn read_chattr(&self, fd: RawFd, entry: &mut CaFormatEntry) -> Result<(), Error> {
if let Some(fs_attr) = read_chattr(fd)? {
let flags = ca_feature_flags_from_chattr(fs_attr);
entry.flags = entry.flags | flags;
let mut attr: usize = 0;
let res = unsafe { read_attr_fd(fd, &mut attr)};
if let Err(err) = res {
if let nix::Error::Sys(errno) = err {
if errno_is_unsupported(errno) { return Ok(()) };
}
bail!("read_attr_fd failed for {:?} - {}", self.current_path, err);
}
let flags = ca_feature_flags_from_chattr(attr as u32);
entry.flags = entry.flags | flags;
Ok(())
}
fn read_fat_attr(&self, fd: RawFd, entry: &mut CaFormatEntry) -> Result<(), Error> {
let mut attr: u32 = 0;
let res = unsafe { read_fat_attr_fd(fd, &mut attr)};
if let Err(err) = res {
if let nix::Error::Sys(errno) = err {
if errno_is_unsupported(errno) { return Ok(()) };
}
bail!("read_fat_attr_fd failed for {:?} - {}", self.current_path, err);
}
let flags = ca_feature_flags_from_fat_attr(attr);
entry.flags = entry.flags | flags;
Ok(())
}
@ -207,6 +233,7 @@ impl <'a, W: Write> CaTarEncoder<'a, W> {
let mut dir_entry = self.create_entry(&dir_stat)?;
self.read_chattr(rawfd, &mut dir_entry)?;
self.read_fat_attr(rawfd, &mut dir_entry)?;
self.write_entry(dir_entry)?;
@ -324,6 +351,7 @@ impl <'a, W: Write> CaTarEncoder<'a, W> {
let mut entry = self.create_entry(&stat)?;
self.read_chattr(filefd, &mut entry)?;
self.read_fat_attr(filefd, &mut entry)?;
self.write_entry(entry)?;
@ -401,17 +429,6 @@ use nix::{convert_ioctl_res, request_code_read, ioc};
/// read Linux file system attributes (see man chattr)
nix::ioctl_read!(read_attr_fd, b'f', 1, usize);
fn read_chattr(rawfd: RawFd) -> Result<Option<u32>, Error> {
let mut attr: usize = 0;
let res = unsafe { read_attr_fd(rawfd, &mut attr)};
if let Err(err) = res {
if let nix::Error::Sys(errno) = err {
if errno_is_unsupported(errno) { return Ok(None) };
}
bail!("read_attr_fd failed - {}", err);
}
Ok(Some(attr as u32))
}
// /usr/include/linux/msdos_fs.h: #define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
// read FAT file system attributes
nix::ioctl_read!(read_fat_attr_fd, b'r', 0x10, u32);

24
src/catar/format_definition.rs
View File

@ -161,3 +161,27 @@ pub fn ca_feature_flags_from_chattr(attr: u32) -> u64 {
flags
}
// from /usr/include/linux/msdos_fs.h
const ATTR_HIDDEN: u32 = 2;
const ATTR_SYS: u32 = 4;
const ATTR_ARCH: u32 = 32;
static FAT_ATTR_MAP: [(u64, u32); 3] = [
( CA_FORMAT_WITH_FLAG_HIDDEN, ATTR_HIDDEN ),
( CA_FORMAT_WITH_FLAG_SYSTEM, ATTR_SYS ),
( CA_FORMAT_WITH_FLAG_ARCHIVE, ATTR_ARCH ),
];
pub fn ca_feature_flags_from_fat_attr(attr: u32) -> u64 {
let mut flags = 0u64;
for (ca_flag, fs_flag) in &FAT_ATTR_MAP {
if (attr & fs_flag) != 0 { flags = flags | ca_flag; }
}
flags
}