pgsql: Refactor code for restoring files via shell commands

Refactor code for restoring files via shell commands

Presently, restore_command uses a different code path than
archive_cleanup_command and recovery_end_command. These code paths
are similar and can be easily combined, as long as it is possible to
identify if a command should:
- Issue a FATAL on signal.
- Exit immediately on SIGTERM.

While on it, this removes src/common/archive.c and its associated
header. Since the introduction of c96de2c, BuildRestoreCommand() has
become a simple wrapper of replace_percent_placeholders() able to call
make_native_path(). This simplifies shell_restore.c as long as
RestoreArchivedFile() includes a call to make_native_path().

Author: Nathan Bossart
Reviewed-by: Andres Freund, Michael Paquier
Discussion: https://postgr.es/m/20221227192449.GA3672473@nathanxps13

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/14bdb3f13de16523609d838b725540af5e23ddd3

Modified Files
--------------
src/backend/access/transam/shell_restore.c | 98 ++++++++++++++----------------
src/backend/access/transam/xlogarchive.c | 1 -
src/common/Makefile | 1 -
src/common/archive.c | 60 ------------------
src/common/meson.build | 1 -
src/fe_utils/archive.c | 11 +++-
src/include/common/archive.h | 21 -------
src/tools/msvc/Mkvcbuild.pm | 2 +-
8 files changed, 56 insertions(+), 139 deletions(-)