mirror of
https://github.com/nix-community/impermanence
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dff77f78e2
If they're not filesystem roots, they won't exist when deploying to a new system and would otherwise have to be manually created.
61 lines
2.3 KiB
Bash
Executable file
61 lines
2.3 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -o nounset # Fail on use of unset variable.
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set -o errexit # Exit on command failure.
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set -o pipefail # Exit on failure of any command in a pipeline.
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set -o errtrace # Trap errors in functions and subshells.
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set -o noglob # Disable filename expansion (globbing),
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# since it could otherwise happen during
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# path splitting.
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shopt -s inherit_errexit # Inherit the errexit option status in subshells.
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# Print a useful trace when an error occurs
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trap 'echo Error when executing ${BASH_COMMAND} at line ${LINENO}! >&2' ERR
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# Given a source directory, /source, and a target directory,
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# /target/foo/bar/bazz, we want to "clone" the target structure
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# from source into the target. Essentially, we want both
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# /source/target/foo/bar/bazz and /target/foo/bar/bazz to exist
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# on the filesystem. More concretely, we'd like to map
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# /state/etc/ssh/example.key to /etc/ssh/example.key
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#
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# To achieve this, we split the target's path into parts -- target, foo,
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# bar, bazz -- and iterate over them while accumulating the path
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# (/target/, /target/foo/, /target/foo/bar, and so on); then, for each of
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# these increasingly qualified paths we:
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# 1. Ensure both /source/qualifiedPath and qualifiedPath exist
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# 2. Copy the ownership of the source path to the target path
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# 3. Copy the mode of the source path to the target path
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# Get inputs from command line arguments
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if [[ "$#" != 6 ]]; then
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printf "Error: 'create-directories.bash' requires *six* args.\n" >&2
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exit 1
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fi
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sourceBase="$1"
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target="$2"
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user="$3"
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group="$4"
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mode="$5"
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debug="$6"
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if (( "$debug" )); then
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set -o xtrace
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fi
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# check that the source exists and warn the user if it doesn't, then
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# create them with the specified permissions
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realSource="$(realpath -m "$sourceBase$target")"
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if [[ ! -d $realSource ]]; then
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printf "Warning: Source directory '%s' does not exist; it will be created for you with the following permissions: owner: '%s:%s', mode: '%s'.\n" "$realSource" "$user" "$group" "$mode"
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mkdir --mode="$mode" "$realSource"
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chown "$user:$group" "$realSource"
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fi
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if [[ $sourceBase ]]; then
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[[ -d $target ]] || mkdir "$target"
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# synchronize perms between source and target
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chown --reference="$realSource" "$target"
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chmod --reference="$realSource" "$target"
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fi
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