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90 lines
3.2 KiB
Bash
90 lines
3.2 KiB
Bash
#!/bin/bash -e
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################################################################################
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## File: etc-environment.sh
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## Desc: Helper functions for source and modify /etc/environment
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################################################################################
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# NB: sed expression use '%' as a delimiter in order to simplify handling
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# values containing slashes (i.e. directory path)
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# The values containing '%' will break the functions
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get_etc_environment_variable() {
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local variable_name=$1
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# remove `variable_name=` and possible quotes from the line
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grep "^${variable_name}=" /etc/environment | sed -E "s%^${variable_name}=\"?([^\"]+)\"?.*$%\1%"
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}
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add_etc_environment_variable() {
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local variable_name=$1
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local variable_value=$2
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echo "${variable_name}=${variable_value}" | sudo tee -a /etc/environment
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}
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replace_etc_environment_variable() {
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local variable_name=$1
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local variable_value=$2
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# modify /etc/environemnt in place by replacing a string that begins with variable_name
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sudo sed -i -e "s%^${variable_name}=.*$%${variable_name}=${variable_value}%" /etc/environment
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}
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set_etc_environment_variable() {
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local variable_name=$1
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local variable_value=$2
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if grep "^${variable_name}=" /etc/environment > /dev/null; then
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replace_etc_environment_variable $variable_name $variable_value
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else
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add_etc_environment_variable $variable_name $variable_value
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fi
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}
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prepend_etc_environment_variable() {
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local variable_name=$1
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local element=$2
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# TODO: handle the case if the variable does not exist
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existing_value=$(get_etc_environment_variable "${variable_name}")
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set_etc_environment_variable "${variable_name}" "${element}:${existing_value}"
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}
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append_etc_environment_variable() {
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local variable_name=$1
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local element=$2
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# TODO: handle the case if the variable does not exist
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existing_value=$(get_etc_environment_variable "${variable_name}")
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set_etc_environment_variable "${variable_name}" "${existing_value}:${element}"
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}
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prepend_etc_environment_path() {
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local element=$1
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prepend_etc_environment_variable PATH "${element}"
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}
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append_etc_environment_path() {
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local element=$1
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append_etc_environment_variable PATH "${element}"
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}
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# Process /etc/environment as if it were shell script with `export VAR=...` expressions
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# The PATH variable is handled specially in order to do not override the existing PATH
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# variable. The value of PATH variable read from /etc/environment is added to the end
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# of value of the exiting PATH variable exactly as it would happen with real PAM app read
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# /etc/environment
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#
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# TODO: there might be the others variables to be processed in the same way as "PATH" variable
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# ie MANPATH, INFOPATH, LD_*, etc. In the current implementation the values from /etc/evironments
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# replace the values of the current environment
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reload_etc_environment() {
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# add `export ` to every variable of /etc/environemnt except PATH and eval the result shell script
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eval $(grep -v '^PATH=' /etc/environment | sed -e 's%^%export %')
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# handle PATH specially
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etc_path=$(get_etc_environment_variable PATH)
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export PATH="$PATH:$etc_path"
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}
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