On 9/18/2016 12:28 PM, Achim Gratz wrote:
Achim Gratz writes:
Jon Turney writes:
I notice the section about postinstall scripts doesn't mention
permanent postinsall scripts at all.
Could you possibly provide a couple of paragraphs?
I had sent them to this very list at the time. I need to dig them out
of the archive unless you're faster.
There it is:
The attached patch attempts to extract two paragraphs from this for the
>From 5950633d23c69cf84200409f2f5354901ecb7933 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbr...@cornell.edu>
Date: Mon, 19 Sep 2016 11:30:34 -0400
Subject: [PATCH] Add information about perpetual postinstall scripts
Also mention ".dash" and ".cmd" suffixes.
packaging-package-files.html | 39 ++++++++++++++++++++++++++++++++++-----
1 file changed, 34 insertions(+), 5 deletions(-)
diff --git a/packaging-package-files.html b/packaging-package-files.html
index fdf7fdc..e5db8c5 100755
@@ -160,13 +160,17 @@ etc...
If your package requires certain commands to be executed after the files in
the package are installed, include them in a file in the package called
- /etc/postinstall/<var>package</var>.sh or
+ /etc/postinstall/<var>package</var>.bat, or
- If the file's name ends in ".sh", it is executed with the Cygwin shell; if it
- ends in ".bat", it is executed with the DOS command interpreter. If it
- end with either of these suffixes, it is ignored.
+ If the file's name ends in ".sh", it is executed with the Cygwin
+ bash shell; if it ends in ".dash", it is executed with the Cygwin
+ dash shell; if it ends in ".bat" or ".cmd", it is executed with the
+ Windows command interpreter. If it doesn't end with any of these
+ suffixes, it is ignored.
After the script has been successfully run it is renamed by appending the
@@ -183,6 +187,31 @@ etc...
scripts have already been run.
+<h2>Perpetual postinstall scripts</h2>
+ In addition to the ordinary ("run-once") postinstall scripts
+ described above, the setup program supports "perpetual" postinstall
+ scripts. These are run on every invocation of setup and do not have
+ ".done" appended to their names after they are run. Perpetual
+ postinstall scripts are distinguished from run-once scripts by
+ having names that start with "0p_" or "zp_". Those that start with
+ "0p_" are run before the run-once scripts, and those that start with
+ "zp_" are run after the run-once scripts. Examples include
+ 0p_000_autorebase.dash (provided by the _autorebase package) and
+ 0p_update-info-dir.dash (provided by the info package).
+ For those package maintainers wanting to employ perpetual scripts,
+ the first thing to keep in mind is to only use this feature for
+ things that really can't be done with run-once scripting. Any
+ perpetual script should minimize the resources used (use dash
+ instead of bash for instance) and exit at the earliest possible
+ moment if no action is required. Scripts of type "0p_" must be able
+ to run with the Base packages installed but the postinstall scripts
+ not yet executed; in practical terms that rules out using bash
+ scripts. This limitation does not apply to scripts of type "zp_".