bee-query: Use canonical names in file search

When "bee query PATTERN" is used to grep for installed files, use
the inventory file and translate the filenames from the inventory to
their canonical form, which is the real path, not the path used to
install them, possibly following symlinks.

The new code is a lot faster than the old one. The wall time for
`fakeroot bee query otop` is reduced from 0m11.712s to 0m0.760s.

src/bee-query.sh.in

@@ -32,6 +32,9 @@ VERSION=${BEE_VERSION}
 
 : ${BEE_BINDIR:=@BINDIR@}
 : ${BEE_LIBEXECDIR:=@LIBEXECDIR@}
+: ${BEEFLOCK=${BEE_BINDIR}/beeflock}
+: ${BEECACHE_CACHEDIR=${BEE_CACHEDIR}/bee-cache}
+: ${BEECACHE_INVENTORY=${BEECACHE_CACHEDIR}/INVENTORY}
 
 function bee-list() {
     ${BEE_LIBEXECDIR}/bee/bee.d/bee-list "${@}"
@@ -81,18 +84,22 @@ function get_files() {
 }
 
 function get_pkgs() {
-    f=$1
-
-    for pkg in $(bee-list --installed) ; do
-
-        if egrep -q "file=.*${f}" "${BEE_METADIR}/${pkg}/CONTENT" ; then
-            echo ${pkg}
-            while read line ; do
-                eval $(${BEESEP} "${line}")
-                echo "  ${file}"
-            done < <(egrep "file=.*${f}" "${BEE_METADIR}/${pkg}/CONTENT")
-        fi
-    done
+    file_pattern="$1"
+    last_pkg=''
+
+    ${BEEFLOCK} --shared ${BEECACHE_INVENTORY} \
+        ${BEE_LIBEXECDIR}/bee/beeindextr ${BEECACHE_INVENTORY} | \
+        grep -- "$file_pattern" | \
+        sort | \
+        while read -r pkg mtime uid gid mode size md5 filename; do
+            if [[ $filename =~ $file_pattern ]]; then
+                if [ "$pkg" != "$last_pkg" ]; then
+                    echo $pkg
+                    last_pkg="$pkg"
+                fi
+                printf "    %s\n" "$filename"
+            fi
+        done
 }