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nspawn: add log message to let users know that nspawn needs an empty /dev directory (#4226)

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Fixes https://github.com/systemd/systemd/issues/3695

At the same time it adds a protection against userns chown of inodes of
a shared mount point.
This commit is contained in:
Djalal Harouni 2016-10-05 06:57:02 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent d4c08299f2
commit 41eb436265
1 changed files with 6 additions and 0 deletions
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6
src/nspawn/nspawn.c
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@ -1395,6 +1395,12 @@ static int copy_devnodes(const char *dest) {
} else {
if (mknod(to, st.st_mode, st.st_rdev) < 0) {
/*
* This is some sort of protection too against
* recursive userns chown on shared /dev/
*/
if (errno == EEXIST)
log_notice("%s/dev/ should be an empty directory", dest);
if (errno != EPERM)
return log_error_errno(errno, "mknod(%s) failed: %m", to);