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49 lines
1.8 KiB
49 lines
1.8 KiB
#!/usr/bin/env bash
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set -Eeuo pipefail
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# Runs the command provided as arguments, but attempts to configure permissions first.
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important_read_dirs=("/grist" "/persist")
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write_dir="/persist"
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current_user_id=$(id -u)
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# We want to avoid running Grist as root if possible.
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# Try to setup permissions and de-elevate to a normal user.
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if [[ $current_user_id == 0 ]]; then
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target_user=${GRIST_DOCKER_USER:-grist}
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target_group=${GRIST_DOCKER_GROUP:-grist}
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# Make sure the target user owns everything that Grist needs write access to.
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find $write_dir ! -user "$target_user" -exec chown "$target_user" "{}" +
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# Make a home directory for the target user, in case anything needs to access it.
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export HOME="/grist_user_homes/${target_user}"
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mkdir -p "$HOME"
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chown -R "$target_user":"$target_group" "$HOME"
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# Restart as the target user, replacing the current process (replacement is needed for security).
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# Alternative tools to setpriv are: chroot, gosu.
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# Need to use `exec` to close the parent shell, to avoid vulnerabilities: https://github.com/tianon/gosu/issues/37
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exec setpriv --reuid "$target_user" --regid "$target_group" --init-groups /usr/bin/env bash "$0" "$@"
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fi
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# Printing the user helps with setting volume permissions.
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echo "Running Grist as user $(id -u) with primary group $(id -g)"
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# Validate that this user has access to the top level of each important directory.
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# There might be a benefit to testing individual files, but this is simpler as the dir may start empty.
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for dir in "${important_read_dirs[@]}"; do
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if ! { test -r "$dir" ;} ; then
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echo "Invalid permissions, cannot read '$dir'. Aborting." >&2
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exit 1
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fi
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done
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for dir in "${important_write_dirs[@]}"; do
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if ! { test -r "$dir" && test -w "$dir" ;} ; then
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echo "Invalid permissions, cannot write '$dir'. Aborting." >&2
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exit 1
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fi
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done
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exec /usr/bin/tini -s -- "$@"
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