feat: add basic slice definitions files for Focal

[cjdcordeiro]

This PR backports (from 22.04) and fits a few (the most basic and essential) slice definitions files into the new Focal Chisel release.

The affected packages are:

• base-files
• base-passwd
• ca-certificates
• libc6
• libgcc-s1

The choice of packages was driven by our Chiselled Ubuntu base image.

Moved to #42

[woky]

@cjdcordeiro Did you just copy it from other release? AFAIK some libc6 libraries in jammy are not in focal?

[cjdcordeiro]

@cjdcordeiro Did you just copy it from other release? AFAIK some libc6 libraries in jammy are not in focal?

@woky copied and changed. libc6 had to be completely changed yes. The libraries diff isn't that significant, but the main difference is the naming convention.

diff --git a/slices/libc6.yaml b/slices/libc6.yaml
index 49c5c40..4351620 100644
--- a/slices/libc6.yaml
+++ b/slices/libc6.yaml
@@ -7,24 +7,26 @@ slices:
 
   libs:
     contents:
-      /lib/*-linux-*/ld*.so.*:
-      /lib/*-linux-*/libBrokenLocale.so.*:
-      /lib/*-linux-*/libanl.so.*:
-      /lib/*-linux-*/libc.so.*:
-      /lib/*-linux-*/libc_malloc_debug.so.*:
-      /lib/*-linux-*/libdl.so.*:
-      /lib/*-linux-*/libm.so.*:
+      /lib/*-linux-*/ld*.so*:
+      /lib/*-linux-*/libBrokenLocale*.so*:
+      /lib/*-linux-*/libSegFault.so:
+      /lib/*-linux-*/libanl*.so*:
+      /lib/*-linux-*/libc*.so*:
+      /lib/*-linux-*/libdl*.so*:
+      /lib/*-linux-*/libm*.so*:
       /lib/*-linux-*/libmemusage.so:
-      /lib/*-linux-*/libmvec.so.*: {arch: amd64}
-      /lib/*-linux-*/libnsl.so.*:
-      /lib/*-linux-*/libnss_compat.so.*:
-      /lib/*-linux-*/libnss_dns.so.*:
-      /lib/*-linux-*/libnss_files.so.*:
-      /lib/*-linux-*/libnss_hesiod.so.*:
+      /lib/*-linux-*/libmvec*.so*: {arch: amd64}
+      /lib/*-linux-*/libnsl*.so*:
+      /lib/*-linux-*/libnss_compat*.so*:
+      /lib/*-linux-*/libnss_dns*.so*:
+      /lib/*-linux-*/libnss_files*.so*:
+      /lib/*-linux-*/libnss_hesiod*.so*:
+      /lib/*-linux-*/libnss_nis*.so*:
+      /lib/*-linux-*/libnss_nisplus*.so*:
       /lib/*-linux-*/libpcprofile.so:
-      /lib/*-linux-*/libpthread.so.*:
-      /lib/*-linux-*/libresolv.so.*:
-      /lib/*-linux-*/librt.so.*:
-      /lib/*-linux-*/libthread_db.so.*:
-      /lib/*-linux-*/libutil.so.*:
+      /lib/*-linux-*/libpthread*.so*:
+      /lib/*-linux-*/libresolv*.so*:
+      /lib/*-linux-*/librt*.so*:
+      /lib/*-linux-*/libthread_db*.so*:
+      /lib/*-linux-*/libutil*.so*:
       /lib*/ld*.so.*:

[rebornplusplus]

I have only briefly taken a look at libc6. Will be thorough with the new changes. :)

PS. This reminded me. Perhaps we should have a basic test action in this repo which runs Chisel on the proposed slices and gives out a preliminary verdict.

[cjdcordeiro]

@rebornplusplus @woky this was moved to #42 since I had to edit the base branch. Please continue the review in there ;) (sry about that)