X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=lib%2Ftools.in;fp=lib%2Ftools.in;h=fe7d54a38de94fc8c7b44513e402e227314021d8;hb=1775e74030da0071f8c49b60d076afdea06a8cd6;hp=0005be943c3e3b186c2eabe1a51179615c921acb;hpb=e8db349a5b2af6ffb9004ef6eed9cb9d3aa57231;p=matthijs%2Fupstream%2Fbackupninja-vserver.git

diff --git a/lib/tools.in b/lib/tools.in
index 0005be9..fe7d54a 100644
--- a/lib/tools.in
+++ b/lib/tools.in
@@ -46,3 +46,46 @@ function getconf() {
 	# because it is in an 'eval' statement.
 	eval $1='$ret'
 }
+
+#
+# Replaces escape sequences in $1 with the proper values for the vserver $2.
+# The result is put on stdout.  If $2 is empty, values for the host are
+# replaced. The following values are replaced:
+#
+# %%  Literal %
+# %h  The short hostname (as returned by hostname -s)
+# %H  The full hostname (as returned by hostname --fqdn)
+# %n  The vserver name, or empty for the host
+# %N  The vserver name, or "host" for the host
+# %v  The vserver root directory, or empty for the host
+#
+# Note that the given vserver must be running!
+#
+function interpolate() {
+	path=$1
+	vsname=$2
+	vexec=${vsname:+$VSERVER $vsname exec }
+	# Find the values to replace
+	h=`$vexec hostname -s`
+	H=`$vexec hostname --fqdn`
+	n=$vsname
+	N=${vsname:-host}
+	v=${vsname:+$VROOTDIR/$vsname}
+
+	expr=''
+	for var in h H n N v; do
+		# Do indirect lookup of the value to replace
+		val=${!var}
+		# Escape slashes (twice, bash seems to eat one somewhere)
+		val=`echo "$val" | sed 's#/#\\\\/#g'`
+		# Add replacement pattern. The first part checks that there is
+		# an odd number of percent signs before the variable, so
+		# double % is properly left alone.
+		expr="${expr}s/\(\(^\|[^%]\)\(%%\)*\)%$var/\1$val/g;"
+	done
+	# Finally replace literal % signs
+	expr="${expr}s/%%/%/g"
+
+	# Do the actual interpolation
+	echo $path | sed "$expr"
+}