Filter out the /outputs/ directory

The issue here is that we copy all build results (packages) in the container to
/outputs and then butido uses that directory to fetch the outputs of the build.

But, because how the docker API works, we get a TAR stream from docker that
_contains_ the /outputs directory. But of course, we don't want that.

Until now, that was no issue. But it has become one now that we start adopting
butido for our real-world scenarios.

This patch adds filtering out that /outputs portion of the pathes from the tar
archive when writing all the things to disc.

Signed-off-by: Matthias Beyer <matthias.beyer@atos.net>
Tested-by: Matthias Beyer <matthias.beyer@atos.net>

4 files changed, 52 insertions, 10 deletions

diff --git a/doc/containers.md b/doc/containers.md
index cbb62a0..52f4b4a 100644
--- a/doc/containers.md
+++ b/doc/containers.md
@@ -15,7 +15,7 @@ on. Those are listed here.
 
 1. Dependencies are named `/inputs/<packagename>-<packageversion>.pkg` inside the container
 2. Sources are named `/inputs/src-<hashsum>.source`
-3. Outputs are expected to be named `/outputs/<packagename>-<packageversion>.pkg`
+3. Outputs are expected to be written to the `/outputs` directory
 
 The reason for the names lies in the artifact parsing mechanism.
 If the package is named differently, the artifact parsing mechanism is not able
diff --git a/src/consts.rs b/src/consts.rs
index 8891f81..5c6dbc4 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -16,6 +16,7 @@ pub const INPUTS_DIR_PATH: &str  = "/inputs";
 /// The path to the directory inside the container where the outputs of a compile job must be
 /// located after the script was run
 pub const OUTPUTS_DIR_PATH: &str = "/outputs";
+pub const OUTPUTS_DIR_NAME: &str = "outputs";
 
 /// The path where the script that is executed inside the container is copied to.
 pub const SCRIPT_PATH: &str      = "/script";
diff --git a/src/filestore/path.rs b/src/filestore/path.rs
index e8c7a26..3d74992 100644
--- a/src/filestore/path.rs
+++ b/src/filestore/path.rs
@@ -92,7 +92,35 @@ impl StoreRoot {
     where
         R: std::io::Read,
     {
-        ar.unpack(&self.0).map_err(Error::from)
+        ar.entries()?
+            .into_iter()
+            .map_err(Error::from)
+            .filter_ok(|entry| entry.header().entry_type() == tar::EntryType::Regular)
+            .and_then_ok(|mut entry| -> Result<_> {
+                let path = entry
+                    .path()
+                    .context("Getting path from entry in Archive")?
+                    .components()
+                    .filter(|comp| {
+                        log::trace!("Filtering path component: '{:?}'", comp);
+                        let osstr = std::ffi::OsStr::new(crate::consts::OUTPUTS_DIR_NAME);
+                        match comp {
+                            std::path::Component::Normal(s) => *s != osstr,
+                            _ => true,
+                        }
+                    })
+                    .collect::<PathBuf>();
+
+                log::trace!("Path = '{:?}'", path);
+                let unpack_dest = self.0.join(path);
+                log::trace!("Unpack to = '{:?}'", unpack_dest);
+
+                entry.unpack(unpack_dest)
+                    .map(|_| ())
+                    .map_err(Error::from)
+            })
+            .collect::<Result<Vec<_>>>()
+            .map(|_| ())
     }
 }
 
diff --git a/src/filestore/staging.rs b/src/filestore/staging.rs
index 73701cd..9f60d32 100644
--- a/src/filestore/staging.rs
+++ b/src/filestore/staging.rs
@@ -17,6 +17,9 @@ use anyhow::anyhow;
 use futures::stream::Stream;
 use indicatif::ProgressBar;
 use log::trace;
+use resiter::AndThen;
+use resiter::Filter;
+use resiter::Map;
 use result_inspect::ResultInspect;
 
 use crate::filestore::path::ArtifactPath;
@@ -54,15 +57,25 @@ impl StagingStore {
             .and_then(|bytes| {
                 let mut archive = tar::Archive::new(&bytes[..]);
 
-                let outputs = archive
-                    .entries()
-                    .context("Fetching entries from tar archive")?
-                    .map(|ent| {
-                        let p = ent?
+                let outputs = archive.entries()?
+                    .map_err(Error::from)
+                    .filter_ok(|entry| entry.header().entry_type() == tar::EntryType::Regular)
+                    .and_then_ok(|entry| {
+                        let entry = entry
                             .path()
-                            .context("Getting path of TAR entry")?
-                            .into_owned();
-                        Ok(p)
+                            .context("Getting path from entry in Archive")?
+                            .components()
+                            .filter(|comp| {
+                                log::trace!("Filtering path component: '{:?}'", comp);
+                                let osstr = std::ffi::OsStr::new(crate::consts::OUTPUTS_DIR_NAME);
+                                match comp {
+                                    std::path::Component::Normal(s) => *s != osstr,
+                                    _ => true,
+                                }
+                            })
+                            .collect::<std::path::PathBuf>();
+
+                        Ok(entry)
                     })
                     .inspect(|p| trace!("Path in tar archive: {:?}", p))
                     .collect::<Result<Vec<_>>>()