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435ba67550
* [ubuntu] Unify approach to /etc/environment * [ubuntu] fix typo in XDG_CONFIG_HOME name
91 lines
3.1 KiB
Bash
91 lines
3.1 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 containg slashes (i.e. directory path)
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# The values containing '%' will break the functions
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getEtcEnvironmentVariable () {
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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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addEtcEnvironmentVariable () {
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variable_name="$1"
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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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replaceEtcEnvironmentVariable () {
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variable_name="$1"
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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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setEtcEnvironmentVariable () {
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variable_name="$1"
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variable_value="$2"
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if grep "^${variable_name}=" /etc/environment > /dev/null
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then
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replaceEtcEnvironmentVariable $variable_name $variable_value
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else
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addEtcEnvironmentVariable $variable_name $variable_value
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fi
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}
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prependEtcEnvironmentVariable () {
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variable_name="$1"
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element="$2"
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# TODO: handle the case if the variable does not exist
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existing_value=$(getEtcEnvironmentVariable "${variable_name}")
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setEtcEnvironmentVariable "${variable_name}" "${element}:${existing_value}"
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}
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appendEtcEnvironmentVariable () {
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variable_name="$1"
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element="$2"
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# TODO: handle the case if the variable does not exist
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existing_value=$(getEtcEnvironmentVariable "${variable_name}")
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setEtcEnvironmentVariable "${variable_name}" "${existing_value}:${element}"
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}
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prependEtcEnvironmentPath () {
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element="$1"
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prependEtcEnvironmentVariable PATH "${element}"
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}
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appendEtcEnvironmentPath () {
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element="$1"
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appendEtcEnvironmentVariable PATH "${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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reloadEtcEnvironment () {
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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 $(grep -v '^PATH=' /etc/environment | sed -e 's%^%export %')
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# handle PATH specially
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etc_path=$(getEtcEnvironmentVariable PATH)
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export PATH="$PATH:$etc_path"
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}
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