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authorPaul Holzinger <pholzing@redhat.com>2021-06-08 11:28:46 +0200
committerPaul Holzinger <pholzing@redhat.com>2021-06-08 18:14:00 +0200
commit18fa124dfc5c04cd985446e2e12acc4d1832a45c (patch)
tree29ba521c35a9c28f55363795f7e0ead5704ae7aa /libpod
parent9a3a7327fdafaac66c99130a6729e4bcde8df0b0 (diff)
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Improve systemd-resolved detection
When 127.0.0.53 is the only nameserver in /etc/resolv.conf assume systemd-resolved is used. This is better because /etc/resolv.conf does not have to be symlinked to /run/systemd/resolve/stub-resolv.conf in order to use systemd-resolved. [NO TESTS NEEDED] Fixes: #10570 Signed-off-by: Paul Holzinger <pholzing@redhat.com>
Diffstat (limited to 'libpod')
-rw-r--r--libpod/container_internal_linux.go20
1 files changed, 9 insertions, 11 deletions
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index a3acc3198..94bf7855b 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -1650,22 +1650,20 @@ func (c *Container) generateResolvConf() (string, error) {
}
}
- // Determine the endpoint for resolv.conf in case it is a symlink
- resolvPath, err := filepath.EvalSymlinks(resolvConf)
+ contents, err := ioutil.ReadFile(resolvConf)
// resolv.conf doesn't have to exists
if err != nil && !os.IsNotExist(err) {
return "", err
}
- // Determine if symlink points to any of the systemd-resolved files
- if strings.HasPrefix(resolvPath, "/run/systemd/resolve/") {
- resolvPath = "/run/systemd/resolve/resolv.conf"
- }
-
- contents, err := ioutil.ReadFile(resolvPath)
- // resolv.conf doesn't have to exists
- if err != nil && !os.IsNotExist(err) {
- return "", err
+ ns := resolvconf.GetNameservers(contents)
+ // check if systemd-resolved is used, assume it is used when 127.0.0.53 is the only nameserver
+ if len(ns) == 1 && ns[0] == "127.0.0.53" {
+ // read the actual resolv.conf file for systemd-resolved
+ contents, err = ioutil.ReadFile("/run/systemd/resolve/resolv.conf")
+ if err != nil {
+ return "", errors.Wrapf(err, "detected that systemd-resolved is in use, but could not locate real resolv.conf")
+ }
}
ipv6 := false