+/*
+ * figure out what the difference is for a config file, only called
+ * for an update of a configuration file
+ * return -1 on an error
+ * return 1 if the new file should not be installed
+ * return 0 if the new file should be installed
+ */
+static int adjust_for_config(struct config *conf, struct nitem *n, unsigned int
+ diffs) {
+
+ if (!n->oldwasconf) {
+ return 0;
+ }
+
+ /* TODO what if old was a directory? */
+ if (!n->configuration) {
+ /* replacing conf with non-conf */
+ /* absorb file, mark todo */
+ char hash[ZPM_HASH_STRLEN+1];
+ if (!conf->dryrun) {
+ if (conf->verbose) {
+ fprintf(stderr, "importing old conf file\n");
+ }
+ if (zpm_import(conf->log, n->dest, 0, hash)) {
+ zpm_note_add(conf->log, n->pkglist, n->dest, hash,
+ "replaced config file with non-config. zpm-cat %.8s", hash);
+ } else {
+ fprintf(stderr, "unable to import existing config file %s\n", n->dest);
+ return -1;
+ }
+ } else {
+ fprintf(stderr, "dry-run: would replace config file %s with non-config file\n", n->dest);
+ }
+ return 0;
+ }
+
+ int sametype = (!(diffs & D_TYPE));
+ int isdir = (diffs & D_ISDIR);
+ int eisdir = (diffs & D_EISDIR);
+
+ /* both old and new are config files */
+ if (isdir && sametype) {
+ /* both config directories, can only be changing
+ * metadata, so no adjustment needed
+ */
+ if (conf->verbose) {
+ fprintf(stderr, "both config dirs, ok to update\n");
+ }
+ return 0;
+ }
+
+ if (isdir) {
+ char hash[ZPM_HASH_STRLEN+1];
+
+ /* replacing old file with new directory */
+ /* absorb, make note */
+ if (!conf->dryrun) {
+ if (zpm_import(conf->log, n->dest, 0, hash)) {
+ zpm_note_add(conf->log, n->pkglist, n->dest, hash,
+ "replaced config file with config directory. zpm-cat %.8s", hash);
+ } else {
+ fprintf(stderr, "unable to import existing config file %s\n", n->dest);
+ return -1;
+ }
+ } else {
+ fprintf(stderr, "dry-run: would replace config file %s with config directory\n", n->dest);
+ }
+ return 0;
+ }
+
+ if (eisdir) {
+ /* replacing old conf directory with a conf file.
+ * nothing needs to be done, if the directory
+ * is empty, it's ok to remove. if it's not empty,
+ * the install will fail
+ */
+ return 0;
+ }
+
+ /* replacing old file with new file */
+ /* new is same as on disk */
+ if (!(diffs & D_HASH)) {
+ if (conf->verbose) {
+ fprintf(stderr, "new config file is already on disk, probably shouldn't happen\n");
+ }
+ return 0;
+ }
+
+ /* new is different than on disk, but on disk is same as old */
+ if (!(diffs & D_OHASH)) {
+ if (conf->verbose) {
+ fprintf(stderr, "old config file not changed from default, replacing with new default\n");
+ }
+ /* ok to do the update, since same as default */
+ fprintf(stderr, "updating default config %s\n", n->dest);
+ return 0;
+ }
+
+ /* new is different than on disk, and disk different than old */
+ /* log */
+ if (conf->verbose) {
+ fprintf(stderr, "new default config file is different than on disk, and old default was changed, should keep on-disk config\n");
+ }
+ if (!conf->dryrun) {
+ zpm_note_add(conf->log, n->pkglist, n->dest, n->hash,
+ "default config file update. zpm-cat %.8s", n->hash);
+ /* TODO check for note error */
+ } else {
+ fprintf(stderr, "dry-run: default config file %s update\n",
+ n->dest);
+ }
+ return 1;
+
+}
+