This allows bwrap to be built as a subproject in larger Meson projects.
When built as a subproject, we install into the --libexecdir and
require a program prefix to be specified: for example, Flatpak would use
program_prefix=flatpak- to get /usr/libexec/flatpak-bwrap. Verified to
be backwards-compatible as far as Meson 0.49.0 (Debian 9 backports).
Loosely based on previous work by Jussi Pakkanen (see #133).
Differences between the Autotools and Meson builds:
The Meson build requires a version of libcap that has pkg-config
metadata (introduced in libcap 2.23, in 2013).
The Meson build has no equivalent of --with-priv-mode=setuid. On
distributions like Debian <= 10 and RHEL <= 7 that require a setuid bwrap
executable, the sysadmin or distribution packaging will need to set the
correct permissions on the bwrap executable; Debian already did this via
packaging rather than the upstream build system.
The Meson build supports being used as a subproject, and there is CI
for this. It automatically disables shell completions and man pages,
moves the bubblewrap executable to ${libexecdir}, and renames the
bubblewrap executable according to a program_prefix option that the
caller must specify (for example, Flatpak would use
-Dprogram_prefix=flatpak- to get /usr/libexec/flatpak-bwrap). See the
tests/use-as-subproject/ directory for an example.
Signed-off-by: Simon McVittie <smcv@collabora.com>
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