show uid_map in podman info

show uid_map gid_map in podman info

Signed-off-by: Qi Wang <qiwan@redhat.com>

3 files changed, 23 insertions, 3 deletions

diff --git a/libpod/info.go b/libpod/info.go
index 297086ebb..6caa87038 100644
--- a/libpod/info.go
+++ b/libpod/info.go
@@ -69,6 +69,18 @@ func (r *Runtime) hostInfo() (map[string]interface{}, error) {
 			program["Package"] = packageVersion(path)
 			info["slirp4netns"] = program
 		}
+		uidmappings, err := rootless.ReadMappingsProc("/proc/self/uid_map")
+		if err != nil {
+			return nil, errors.Wrapf(err, "error reading uid mappings")
+		}
+		gidmappings, err := rootless.ReadMappingsProc("/proc/self/gid_map")
+		if err != nil {
+			return nil, errors.Wrapf(err, "error reading gid mappings")
+		}
+		idmappings := make(map[string]interface{})
+		idmappings["uidmap"] = uidmappings
+		idmappings["gidmap"] = gidmappings
+		info["IDMappings"] = idmappings
 	}
 	info["OCIRuntime"] = map[string]interface{}{
 		"path":    r.defaultOCIRuntime.path,
@@ -128,6 +140,7 @@ func (r *Runtime) hostInfo() (map[string]interface{}, error) {
 	}
 	info["hostname"] = host
 	info["eventlogger"] = r.eventer.String()
+
 	return info, nil
 }
 
diff --git a/pkg/rootless/rootless_linux.go b/pkg/rootless/rootless_linux.go
index 05d641383..99307e8c4 100644
--- a/pkg/rootless/rootless_linux.go
+++ b/pkg/rootless/rootless_linux.go
@@ -431,12 +431,14 @@ func becomeRootInUserNS(pausePid, fileToRead string, fileOutput *os.File) (bool,
 		if err != nil {
 			return false, -1, errors.Wrapf(err, "cannot write setgroups file")
 		}
+		logrus.Debugf("write setgroups file exited with 0")
 
 		uidMap := fmt.Sprintf("/proc/%d/uid_map", pid)
 		err = ioutil.WriteFile(uidMap, []byte(fmt.Sprintf("%d %d 1\n", 0, os.Geteuid())), 0666)
 		if err != nil {
 			return false, -1, errors.Wrapf(err, "cannot write uid_map")
 		}
+		logrus.Debugf("write uid_map exited with 0")
 	}
 
 	gidsMapped := false
@@ -602,7 +604,7 @@ func TryJoinFromFilePaths(pausePidPath string, needNewNamespace bool, paths []st
 
 	return joinUserAndMountNS(uint(pausePid), pausePidPath)
 }
-func readMappingsProc(path string) ([]idtools.IDMap, error) {
+func ReadMappingsProc(path string) ([]idtools.IDMap, error) {
 	file, err := os.Open(path)
 	if err != nil {
 		return nil, errors.Wrapf(err, "cannot open %s", path)
@@ -668,7 +670,7 @@ func ConfigurationMatches() (bool, error) {
 		return false, err
 	}
 
-	currentUIDs, err := readMappingsProc("/proc/self/uid_map")
+	currentUIDs, err := ReadMappingsProc("/proc/self/uid_map")
 	if err != nil {
 		return false, err
 	}
@@ -677,7 +679,7 @@ func ConfigurationMatches() (bool, error) {
 		return false, err
 	}
 
-	currentGIDs, err := readMappingsProc("/proc/self/gid_map")
+	currentGIDs, err := ReadMappingsProc("/proc/self/gid_map")
 	if err != nil {
 		return false, err
 	}
diff --git a/pkg/rootless/rootless_unsupported.go b/pkg/rootless/rootless_unsupported.go
index ddd9182b0..ce488f364 100644
--- a/pkg/rootless/rootless_unsupported.go
+++ b/pkg/rootless/rootless_unsupported.go
@@ -65,3 +65,8 @@ func ConfigurationMatches() (bool, error) {
 func GetConfiguredMappings() ([]idtools.IDMap, []idtools.IDMap, error) {
 	return nil, nil, errors.New("this function is not supported on this os")
 }
+
+// ReadMappingsProc returns the uid_map and gid_map
+func ReadMappingsProc(path string) ([]idtools.IDMap, error) {
+	return nil, nil
+}