Improve flatpak's user-agent so web servers will have better logs/stats

[jgarciao]

Hi,

If I run this command in my computer with flatpak 0.8.4

flatpak install http://localhost/test-app/io.github.jgarciao.TestApp.flatpakref

I get this logs in Apache:

::1 - - [16/Mar/2017:17:21:26 +0100] "GET /test-app/io.github.jgarciao.TestApp.flatpakref HTTP/1.1" 200 2100 "-" "flatpak-builder libsoup/2.48.0"
::1 - - [16/Mar/2017:17:28:35 +0100] "GET /test-app/io.github.jgarciao.TestApp.flatpakref HTTP/1.1" 200 2100 "-" "flatpak-builder libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:43 +0100] "GET /test-app/repo/summary.sig HTTP/1.1" 200 637 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:43 +0100] "GET /test-app/repo/summary HTTP/1.1" 200 648 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:58 +0100] "GET /test-app/repo/config HTTP/1.1" 200 296 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:58 +0100] "GET /test-app/repo/summary.sig HTTP/1.1" 200 636 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:58 +0100] "GET /test-app/repo/summary HTTP/1.1" 200 648 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:58 +0100] "GET /test-app/repo/deltas/KY/j5MQPA+fLdXXsYCOWNPP71N3oOhBNLHBeytlMr89k/superblock HTTP/1.1" 404 577 "-" "ostree libsoup/2.48.0"
127.0.0.1 - - [16/Mar/2017:17:28:58 +0100] "GET /test-app/repo/objects/29/88f93103c0f9f2dd5d7b1808e58d3cfef5377a0e84134b1c17b2b6532bf3d9.commitmeta HTTP/1.1" 200 1220 "-" "ostree libsoup/2.48.0"

[...]

I see that flatpak is setting as user-agent "flatpak-builder libsoup/2.48.0" and ostree "ostree libsoup/2.48.0"

In my opinion it could be very useful to set an improved user-agent with some extra information like the flatpak version, the arch and even if it's possible the user's distribution. This way the HTTP server logs will be much more useful

[jgarciao]

Thanks!

[jgarciao]

In case you want to add also the distro name and version in the future maybe this code from gnome-software could be useful: https://git.gnome.org/browse/gnome-software/tree/lib/gs-os-release.c