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[9.1] bind /dev/fuse into the payload container when available #8740

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[9.1] bind /dev/fuse into the payload container when available #8740

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7 changes: 7 additions & 0 deletions src/DIRAC/Resources/Computing/SingularityComputingElement.py
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Original file line number Diff line number Diff line change
Expand Up @@ -346,6 +346,11 @@ def submitJob(self, executableFile, proxy=None, **kwargs):
# Now prepare start singularity
# Mount /cvmfs in if it exists on the host
withCVMFS = os.path.isdir("/cvmfs")
# Payloads may need to start a container of their own (e.g. lb-run for an
# application which needs an older OS). As --contain gives them a minimal
# /dev, apptainer is left without /dev/fuse and so cannot fall back to
# fuse-overlayfs on hosts where the kernel overlay is unavailable.
withFuse = os.path.exists("/dev/fuse")
innerCmd = os.path.join(self.__innerdir, "dirac_container.sh")
outerCmd = ["apptainer", "exec"]
outerCmd.extend(["--contain"]) # use minimal /dev and empty other directories (e.g. /tmp and $HOME)
Expand All @@ -356,6 +361,8 @@ def submitJob(self, executableFile, proxy=None, **kwargs):
outerCmd.append("--userns")
if withCVMFS:
outerCmd.extend(["--bind", "/cvmfs"])
if withFuse:
outerCmd.extend(["--bind", "/dev/fuse"])
if not self.__installDIRACInContainer:
outerCmd.extend(["--bind", "{0}:{0}:ro".format(self.__findInstallBaseDir())])

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