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-rw-r--r--FLOW.md38
-rw-r--r--FLOW/fail.svg588
-rw-r--r--FLOW/ok.svg588
-rw-r--r--Makefile2
-rw-r--r--README.md3
5 files changed, 1219 insertions, 0 deletions
diff --git a/FLOW.md b/FLOW.md
new file mode 100644
index 0000000..7fd1f9b
--- /dev/null
+++ b/FLOW.md
@@ -0,0 +1,38 @@
+pacredir - request flow
+=======================
+
+[◀ Go back to main README](README.md)
+
+Whenever `pacman` sends a request to `pacredir` a number of requests
+(increasing with the number of hosts found) is sent through the network.
+Let's assume `pacredir` knows about two hosts.
+
+OK - serving from local network
+-------------------------------
+
+In this exemple one hast (`host A`) is missing the file, but second
+one (`host B`) does have the file.
+
+For database files the decision on what return code (`307` vs. `404`) to
+send is made on the file age. The local file's timestamp is compared to
+what timestamp `pacman` sends in its request.
+
+![OK - serving from local network](FLOW/ok.svg)
+
+After the initial request `pacman` is redirected to `host B` and gets the
+file there. No request is sent to the mirror.
+
+FAIL - fallback to mirror
+-------------------------
+
+In this example no host has the file or the local database files are older
+than what `pacman` requested.
+
+![FAIL - fallback to mirror](FLOW/fail.svg)
+
+All requests made by `pacredir` are answered with http code `404`, thus
+`pacman` receives the same. Finally `pacman` falls back to the next mirror.
+
+---
+[◀ Go back to main README](README.md)
+[▲ Go back to top](#top)
diff --git a/FLOW/fail.svg b/FLOW/fail.svg
new file mode 100644
index 0000000..c20be32
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diff --git a/FLOW/ok.svg b/FLOW/ok.svg
new file mode 100644
index 0000000..0f349f2
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diff --git a/Makefile b/Makefile
index f4e28b5..ae09b42 100644
--- a/Makefile
+++ b/Makefile
@@ -69,6 +69,8 @@ install-bin: pacredir avahi/pacserve.service
install-doc: $(HTML)
$(INSTALL) -d -m0755 $(DESTDIR)$(PREFIX)/share/doc/pacredir/
$(INSTALL) -D -m0644 $(MARKDOWN) $(HTML) -t $(DESTDIR)$(PREFIX)/share/doc/pacredir/
+ $(INSTALL) -d -m0755 $(DESTDIR)$(PREFIX)/share/doc/pacredir/FLOW/
+ $(INSTALL) -D -m0644 $(wildcard FLOW/*) -t $(DESTDIR)$(PREFIX)/share/doc/pacredir/FLOW/
clean:
$(RM) -f *.o *~ pacredir avahi/pacserve.service $(HTML) version.h
diff --git a/README.md b/README.md
index 3907feb..4bcc937 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,9 @@ Please note that `pacredir` redirects to the most recent file found on
the local network. To make sure you really do have the latest files run
`pacman -Syu` *twice*.
+To get a better idea what happens in the background have a look at
+[the request flow chart](FLOW.md).
+
Security
--------
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-11-27 18:26:23 +0000