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pxar: encoder: warn on lacking read permissions instead of fail.

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If during creation of the archive, files/dirs with lacking read permissions are
encountered, the user is displayed a warning and the archive is created without
including the file/dir.
Previously this resulted in an error and the archive creation failed.

In order to implement this also for the .pxarexclude files, the Error type of
MatchPattern::from_file() and MatchPattern::from_line() was adopted accordingly.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
This commit is contained in:
Christian Ebner
2020-01-08 15:14:44 +01:00
committed by Dietmar Maurer
parent 88cee60bad
commit ecbc62261c
3 changed files with 41 additions and 9 deletions
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35
src/pxar/encoder.rs
View File

@ -697,6 +697,14 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
(Some((buffer, stat)), excludes)
}
Ok(None) => (None, Vec::new()),
Err(nix::Error::Sys(Errno::EACCES)) => {
// No permission to read .pxarexclude, ignore its contents.
eprintln!(
"ignoring match patterns in {:?}: open file failed - EACCES",
self.full_path().join(".pxarexclude"),
);
(None, Vec::new())
}
Err(err) => bail!("error while reading exclude file - {}", err),
};
for excl in &excludes {
@ -777,6 +785,7 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
let start_pos = self.writer_pos;
if filename.as_bytes() == b".pxarexclude" {
// pxar_exclude is none in case of error EACCES.
if let Some((ref content, ref stat)) = pxar_exclude {
let filefd = match nix::fcntl::openat(
rawfd,
@ -789,6 +798,14 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
self.report_vanished_file(&self.full_path())?;
continue;
}
Err(nix::Error::Sys(Errno::EACCES)) => {
let filename_osstr = std::ffi::OsStr::from_bytes(filename.to_bytes());
eprintln!(
"skipping {:?}: open file failed - EACCES",
self.full_path().join(filename_osstr),
);
continue;
}
Err(err) => {
let filename_osstr = std::ffi::OsStr::from_bytes(filename.to_bytes());
bail!(
@ -810,8 +827,8 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
catalog.add_file(&filename, stat.st_size as u64, stat.st_mtime as u64)?;
}
self.encode_pxar_exclude(filefd, stat, child_magic, content)?;
continue;
}
continue;
}
if is_root && filename.as_bytes() == b".pxarexclude-cli" {
@ -846,6 +863,14 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
self.relative_path.pop();
continue;
}
Err(nix::Error::Sys(Errno::EACCES)) => {
eprintln!(
"skipping {:?}: open dir failed - EACCES",
self.full_path(),
);
self.relative_path.pop();
continue;
}
Err(err) => bail!("open dir {:?} failed - {}", self.full_path(), err),
};
@ -901,6 +926,14 @@ impl<'a, W: Write, C: BackupCatalogWriter> Encoder<'a, W, C> {
self.relative_path.pop();
continue;
}
Err(nix::Error::Sys(Errno::EACCES)) => {
eprintln!(
"skipping {:?}: open file failed - EACCES",
self.full_path(),
);
self.relative_path.pop();
continue;
}
Err(err) => bail!("open file {:?} failed - {}", self.full_path(), err),
};