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-rw-r--r--buildstream/sandbox/_sandboxchroot.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/buildstream/sandbox/_sandboxchroot.py b/buildstream/sandbox/_sandboxchroot.py
index 71422476a..7266a00e3 100644
--- a/buildstream/sandbox/_sandboxchroot.py
+++ b/buildstream/sandbox/_sandboxchroot.py
@@ -188,7 +188,7 @@ class SandboxChroot(Sandbox):
# Exceptions in preexec_fn are simply reported as
# 'Exception occurred in preexec_fn', turn these into
# a more readable message.
- if '{}'.format(e) == 'Exception occurred in preexec_fn.':
+ if str(e) == 'Exception occurred in preexec_fn.':
raise SandboxError('Could not chroot into {} or chdir into {}. '
'Ensure you are root and that the relevant directory exists.'
.format(rootfs, cwd)) from e