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Top Forums Shell Programming and Scripting Blog-Thread: Creating a Shell Wrapper and Runtime Modifier (SWARM) Post 303045697 by sea on Thursday 9th of April 2020 07:20:07 AM
Old 04-09-2020
Made some basic utilites for cross-plattform usage, as well as for unified and simplified usage.
Reused and wraped RudiC's echo_, thanks again Smilie

Code:
#
# Some tools
#
	swarm.util.isRoot() { #
	# Returns TRUE if user ID is 0
	# Returns FALSE otherwise
		if [[ ${UID:-${EUID:-0}} -eq 0 ]]
		then	$ECHO true
			return 0
		else	$ECHO false
			return 1
		fi
	}
	swarm.util.isGUI() { #
	# Returns TRUE if XDG_CURRENT_DESKTOP, DESKTOP_SESSION or XAUTHORITY is set
	# Returns FALSE otherwise
		if [[ -n "${XDG_CURRENT_DESKTOP:-${DESKTOP_SESSION:-$XAUTHORITY}}" ]]
		then	$ECHO true
			return 0
		else	$ECHO false
			return 1
		fi
	}
	swarm.util.mkdir() { # /path/to/make
	# Creates full path structures
	# 
		${isRO:-false} && return 1
		# Remove any possible args from ARGS
		while [[ "-" == "${1:0:1}" ]] ; do shift ; done
		swarm.protect "$FUNCNAME" "${@}" && return 1
		# Vars
		local dir_done=""
		local dir_todo=$($PRINTF "${1:1}" | $SED s,"/","\n",g)
		# Start pipe
		$PRINTF '%s\n' "$dir_todo" | while read current
		do	# Prepare next dir
			dir_done+="/$current"
			# Create if not exist
			[[ -d "$dir_done" ]] || $MKDIR "$dir_done"
		done
		return 0
	}
	swarm.util.echo() { # [-e|-n|-en|-ne] STRING
	# Simple echo's, by RudiC @ unix.com
	#
		echo_(){
		  ( IFS=" "; $PRINTF "%s\n" "$*" )
		}
		# Portable echo -n
		echo_n() {
		  ( IFS=" "; $PRINTF "%s" "$*" )
		}
		# Portable echo -e
		echo_e() {
		  ( IFS=" "; $PRINTF "%b\n" "$*" )
		}
		# Portable echo -ne
		echo_ne() {
		  ( IFS=" "; $PRINTF "%b" "$*" )
		}
		
		case "${1/-}" in
		"n")	shift ; echo_n "${@}"	;;
		"e")	shift ; echo_e "${@}"	;;
		"en"|"ne")
			shift ; echo_ne "${@}"	;;
		*)		echo_ "${@}"	;;
		esac
	}
	swarm.util.isDir() { #  /path/to/dir
	# Returns true if passed string is a directory
	#
		[[ -d "$1" ]] 
		return $?
	}
#
# Short variable access to util functions
# and to keep file usage to a minimum
#
	isRoot=$(swarm.util.isRoot)
	isGUI=$(swarm.util.isGUI)
	isDir="swarm.util.isDir"
	MKDIR="swarm.util.mkdir"
	ECHO="swarm.util.echo"

But currently I'm still busy in re-thinking/doing the init procedure....
Well, unifying (is that a word??) the procedure of using functions to do different checks, keep/put all variables to RAM while put some essential ones (usage speed increase / customize options) in the 'rc' file.

The specific part of preparing configuration files & folders that are optional - because it must run on a Read-Only system as well, is quite more challenging than making it just in a "must-be-installed" way.
Also, with my... crazy... idea of implementing an optional ramdisk support (as root, for configuration and tempfiles only) didnt make the init procedure any easier.
Further, I need to 'bypass' the (so far hardcoded) use of /root because not all systems have it, thus I have to place the configfile (swarmrc) in another place, like using '/etc' if root has no $HOME.
 

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HFS.UTIL(8)						    BSD System Manager's Manual 					       HFS.UTIL(8)

NAME
hfs.util -- HFS/HFS+ file system utility SYNOPSIS
hfs.util -m device mountpoint [mountflag1] [mountflag2] [mountflag3] [mountflag4] hfs.util -p device [mountflag1] [mountflag2] [mountflag3] [mountflag4] hfs.util -J [size] mountpoint hfs.util -U mountpoint hfs.util -N device hfs.util -I mountpoint hfs.util [-aksu] device DESCRIPTION
The hfs.util command supports the mounting, probing, and unmounting of HFS file systems. Options: -a Adopt permissions for the HFS file system at device -I Print out status information about the journal on the HFS file system at mountpoint -J [size] Enable journaling on the HFS file system mounted on mountpoint. An optional size may be specified (e.g. 32M for a 32 megabyte journal). -k Get the UUID key for the HFS file system at device. -m Mount the HFS file system located on device onto mountpoint with the flags mountflag1 mountflag2 mountflag3 mountflag4 -M Force mount the HFS file system located on device onto mountpoint with the flags mountflag1 mountflag2 mountflag3 mountflag4. This is a deprecated option. -N Disable journaling on a HFS+ file system located at device -p Probe the device for an HFS file system using the flags mountflag1 mountflag2 mountflag3 mountflag4 -s Set the UUID key (generates a new UUID value) for the HFS file system at device -u Unmount the HFS file system located at device -U Disable journaling on the HFS+ file system mounted on mountpoint The mountflags referenced above are either: o removable or fixed o readonly or writeable o suid or nosuid o dev or nodev Note that for the device references above, you must only supply the last component of the path to the device in question, such as disk0s2 rather than /dev/disk0s2. SEE ALSO
diskarbitrationd(8) HISTORY
Derived from the Openstep Workspace Manager file system utility programs. Darwin July 16, 2003 Darwin
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