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allow crossmounts and use subnet mask examples for readme #30

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allow crossmounts and use subnet mask examples for readme #30

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6ae4751
allow crossmounts and use subnet mask examples for readme
Mar 22, 2019
ecdd83d
Update nfsd.sh
dev00 Mar 22, 2019
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4 changes: 3 additions & 1 deletion README.md
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Expand Up @@ -45,7 +45,9 @@ Adding `-e READ_ONLY=true` will cause the exports file to contain `ro` instead o

Adding `-e SYNC=true` will cause the exports file to contain `sync` instead of `async`, enabling synchronous mode. Check the exports man page for more information: https://linux.die.net/man/5/exports.

Adding `-e PERMITTED="10.11.99.*"` will permit only hosts with an IP address starting 10.11.99 to mount the file share.
Adding `-e PERMITTED="10.11.99.0\/24"` will permit only hosts with an IP address starting 10.11.99 to mount the file share. The single backslash is used for escaping the slash dividing net address and netmask during the replacement via sed.

Adding `-e CROSSMNT=yes` will allow to share mounts which are placed in `/some/where/fileshare`. This is especially needed when allowing more than only one IP.

Due to the `fsid=0` parameter set in the **/etc/exports file**, there's no need to specify the folder name when mounting from a client. For example, this works fine even though the folder being mounted and shared is /nfsshare:

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2 changes: 1 addition & 1 deletion exports
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@@ -1 +1 @@
{{SHARED_DIRECTORY}} {{PERMITTED}}({{READ_ONLY}},fsid=0,{{SYNC}},no_subtree_check,no_auth_nlm,insecure,no_root_squash)
{{SHARED_DIRECTORY}} {{PERMITTED}}({{READ_ONLY}},fsid=0,{{SYNC}},{{CROSSMNT}},no_subtree_check,no_auth_nlm,insecure,no_root_squash)
10 changes: 10 additions & 0 deletions nfsd.sh
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Expand Up @@ -74,6 +74,16 @@ else
/bin/sed -i "s/{{SYNC}}/sync/g" /etc/exports
fi

# Check if the CROSSMNT variable is set (rather than a null string) using parameter expansion
if [ -z "${CROSSMNT+y}" ]; then
echo "The CROSSMNT environment variable is unset or null, so do not allow crossmounts."
echo "Mounts in shares will appear empty"
/bin/sed -i "s/{{CROSSMNT}},//g" /etc/exports
else
echo "The CROSSMNT environment variable is set, allowing crossmounts."
/bin/sed -i "s/{{CROSSMNT}}/crossmnt/g" /etc/exports
fi

# Partially set 'unofficial Bash Strict Mode' as described here: http://redsymbol.net/articles/unofficial-bash-strict-mode/
# We don't set -e because the pidof command returns an exit code of 1 when the specified process is not found
# We expect this at times and don't want the script to be terminated when it occurs
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