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--- start [2024/01/28 15:03] – [Building packages from later versions of Debian for earlier releases] abeverley
+++ start [2026/04/12 16:14] (current) – abeverley
@@ Line 24: / Line 24: @@
   debuild -uc -us
-References:
+==== Example: building openarc package from experimental ====
+Add experimental sources to ''/etc/apt/sources.list'':
+  deb-src http://httpredir.debian.org/debian/ experimental main contrib
+  apt-get build-dep openarc
+  apt-get source openarc
+  cd openarc-1.0.0~beta3+dfsg/
+  # Download additional patches
+  cd debian/patches
+  wget https://github.com/trusteddomainproject/OpenARC/pull/167.patch
+  wget https://github.com/trusteddomainproject/OpenARC/pull/168.patch
+  wget https://github.com/trusteddomainproject/OpenARC/pull/170.patch
+  wget https://github.com/trusteddomainproject/OpenARC/pull/173.patch
+  # Apply
+  cd ../..
+  patch -p1 < debian/patches/167.patch
+  patch -p1 < debian/patches/168.patch
+  patch -p1 < debian/patches/170.patch
+  patch -p1 < debian/patches/173.patch
+  dch --bpo # Add letter to suggested version
+  dpkg-source --commit
+  debuild -uc -us
+==== References ====
 https://ostechnix.com/how-to-build-debian-packages-from-source/
@@ Line 30: / Line 55: @@
 Versioning info: https://www.debian.org/doc/debian-policy/ch-controlfields.html#version
+===== Building Debian packages of Perl modules =====
+On production servers, I much prefer to use Perl modules from Debian repositories, rather than installing from CPAN or using some sort of pinning technique. The advantage is that they are maintained upstream, are more stable, faster to install and easier overall to manage.
+Sometimes a Perl module is either not available in the main Debian repositories, or the version is too old (or I need a patch that has not made it upstream yet). In these circumstances I build my own Debian packages of Perl modules. Normally building a package is easy, but sometimes it can be a bit of an art. Read more about [[building Debian packages of Perl modules]].
+===== Disk performance tests =====
+See https://askubuntu.com/a/991311 (regarding fio tool)
+Test for all-round read/write (worst performance):
+  fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=randrw --size=500m --io_size=10g --blocksize=4k --ioengine=libaio --fsync=1 --iodepth=1 --direct=1 --numjobs=1 --runtime=60 --group_reporting
+Sequential read:
+  fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=read --size=500m --io_size=10g --blocksize=1024k --ioengine=libaio --fsync=10000 --iodepth=32 --direct=1 --numjobs=1 --runtime=60 --group_reporting
+Sequential write:
+  fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=write --size=500m --io_size=10g --blocksize=1024k --ioengine=libaio --fsync=10000 --iodepth=32 --direct=1 --numjobs=1 --runtime=60 --group_reporting
+Random read:
+  fio --name TEST --eta-newline=5s --filename=fio-tempfile.dat --rw=randread --size=500m --io_size=10g --blocksize=4k --ioengine=libaio --fsync=1 --iodepth=1 --direct=1 --numjobs=1 --runtime=60 --group_reporting
 ===== JSON Web Tokens with Perl =====
@@ Line 45: / Line 96: @@
 [[overlay|Using Overlay to extract data from OpenStreetMap]]
+===== Quick and dirty string dumping in Perl =====
+From https://blogs.perl.org/users/mauke/2026/04/quick-and-dirty-string-dumping.html
+A non-obvious feature of sprintf can help here: sprintf('%vd', $string) gives the decimal values of all code points in $string separated by dots. For example:
+  sprintf('%vd', "abc\n\a") is 97.98.99.10.7
+  sprintf('%vd', "\xe2\x82\xac") is 226.130.172
+  sprintf('%vd', "\x{20ac}") is 8364
+Don't like decimal character codes? Use hex instead:
+  sprintf('%vx', "abc\n\a") is 61.62.63.a.7
+  sprintf('%vx', "\xe2\x82\xac") is e2.82.ac
+  sprintf('%vx', "\x{20ac}") is 20ac
+Don't like dots? Use whatever separator you want:
+  sprintf('%*vd', '~', "abc\n\a") is 97~98~99~10~7
 ===== Using iptables and PHP to create a captive portal =====