firestart: improve error reporting

1 files changed, 9 insertions, 4 deletions

diff --git a/firestart b/firestart
index d88ae52..da094c6 100755
--- a/firestart
+++ b/firestart
@@ -1,16 +1,18 @@
 #!/bin/sh
 
+die() { printf "%s: Error: %s\n" "$0" "$*" >&2; exit 1; }
+
 CMD=firefox
 UNIT=$CMD
 DIR=~/.mozilla
 MEMORY_MAX=50%
 READ_OPS=1G
 WRITE_OPS=$READ_OPS
+CONFDIR=$HOME/.config/firestart/conf
 
-cfg=$HOME/.config/firestart/conf
-if [ -e "$cfg" ]
+if [ -e "$CONFDIR" ]
 then
-    . "$cfg"
+    . "$CONFDIR"
 fi
 
 if systemctl --user is-active "$UNIT" >/dev/null
@@ -19,8 +21,11 @@ then
     exit
 fi
 
+[ -e "$DIR" ] || die "does not exist: $DIR"
+[ -d "$DIR" ] || die "not a directory: $DIR"
+
 DEV=$(echo $(findmnt --target "$DIR" -o MAJ:MIN -n))
-[ "$DEV" ] || exit
+[ "$DEV" ] || die "could not determine backing device for $DIR"
 
 systemctl --user reset-failed "$UNIT" 2>/dev/null
 systemd-run --user \