Add docs and fix output.

cmd/csaf_downloader/config.go

@@ -10,6 +10,7 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"net/http"
 	"regexp"
 
@@ -94,6 +95,9 @@ func (cfg *config) compileIgnorePatterns() error {
 		if err != nil {
 			return fmt.Errorf("invalid ignorepattern: %w", err)
 		}
+		if cfg.Verbose {
+			log.Printf("ignore advisories containing pattern %q\n", expr)
+		}
 		cfg.ignorePattern = append(cfg.ignorePattern, expr)
 	}
 	return nil

cmd/csaf_downloader/downloader.go

@@ -349,7 +349,7 @@ nextAdvisory:
 
 		if d.cfg.ignoreURL(file.URL()) {
 			if d.cfg.Verbose {
-				log.Printf("Igoring %q.\n", file.URL())
+				log.Printf("Ignoring %q.\n", file.URL())
 			}
 			continue
 		}

docs/csaf_downloader.md

@@ -16,6 +16,7 @@ Application Options:
   -w, --worker=NUM                 NUMber of concurrent downloads (default: 2)
   -t, --timerange=RANGE            RANGE of time from which advisories to download
   -f, --folder=FOLDER              Download into a given FOLDER
+  -i, --ignorepattern=PATTERN      Dont download files if there URLs match any of the given PATTERNs
   -H, --header=                    One or more extra HTTP header fields
       --validator=URL              URL to validate documents remotely
       --validatorcache=FILE        FILE to cache remote validations
@@ -52,11 +53,13 @@ ignoresigcheck    = false
 verbose           = false
 # rate            # set to unlimited
 worker            = 2
+# timerange       # not set by default
+# folder          # not set by default
+# ignorepattern   # not set by default
 # header          # not set by default
 # validator       # not set by default
 # validatorcache  # not set by default
 validatorpreset   = ["mandatory"]
-# timerange       # not set by default
 ```
 
 The `timerange` parameter enables downloading advisories which last changes falls
@@ -88,6 +91,14 @@ into a given intervall. There are three possible notations:
 
 All interval boundaries are inclusive.
 
-if the `folder` option is given the advisories are stored in this folder.  
+If the `folder` option is given the advisories are stored in this folder. 
 If it is omitted (by default) the advisories are stored in folder name by the
 year they are from.
+
+You can ignore certain advisories while downloading by specifying a list
+of regular expressions to match their URLs by using the `ignorepattern` option. 
+E.g. `-i='.*white.*' -i='*.red.*'` will ignore files wich URLs contain the sub strings **white** or **red**.
+In the config file this has to be noted as:
+```
+ignorepattern = [".*white.*", ".*red.*"]
+```