configure --with-default-config-file=[FILE] create sub-directories

[rohara]

Describe the bug
When the configure script uses the --with-default-config-file=[FILE] option and FILE points to a file in a specific sub-directory, the PATH to the file is created and installed. Easier to explain with an example. See below.

To Reproduce
Run the configure script with the --with-default-config-file option and point to a file in an absolute or relative path (I did relative). I'm also using --prefix for testing purposes.

mkdir /tmp/root/
./configure --prefix=/tmp/root/ --with-default-config-file=./doc/samples/keepalived.conf.sample
make
make install

Now, since our prefix is '/tmp/root/', the config file will be installed to '/tmp/root/etc/keepalived/./doc/samples/keepalived.conf.sample'. This is not at all what I expected. It seems that this configure option is a bit too literal. The way it works now it seems that you're only truly getting a default config file if you use "keepalived.conf" as the FILE.

Expected behavior
My expectation was that the path/file passed to --with-default-config-file would be installed to "$PREFIX/etc/keepalived/keepalived.conf" -- that is the default config file location. Instead, it created the exact path/file as specified.

Keepalived version

Keepalived v2.2.7 (01/16,2022)

Copyright(C) 2001-2022 Alexandre Cassen, <acassen@gmail.com>

Built with kernel headers for Linux 5.15.4
Running on Linux 5.15.4-201.fc35.x86_64 #1 SMP Tue Nov 23 18:54:50 UTC 2021
Distro: Fedora Linux 35 (Thirty Five)

configure options: --enable-debug --enable-profile --enable-snmp --enable-snmp-rfc --enable-nftables --disable-iptables --enable-sha1 --with-default-config-file=./doc/samples/keepalived.conf.sample --prefix=/home/rohara/tmp/root/

Config options:  NFTABLES LVS VRRP VRRP_AUTH VRRP_VMAC OLD_CHKSUM_COMPAT SNMP_V3_FOR_V2 SNMP_VRRP SNMP_CHECKER SNMP_RFCV2 SNMP_RFCV3 TIMER_CHECK NETLINK_TIMERS SMTP_ALERT_DEBUG EPOLL_DEBUG EPOLL_THREAD_DUMP TSM_DEBUG VRRP_FD_DEBUG NETWORK_TIMESTAMP ASSERT PROFILING FILE_LOGGING LOG_FILE_APPEND RECVMSG_DEBUG EINTR_DEBUG SCRIPT_DEBUG TRACK_PROCESS_DEBUG PARSER_DEBUG CHECKSUM_DEBUG CHECKER_DEBUG SMTP_CONNECT_DEBUG DUMP_KEYWORDS INIT=systemd SYSTEMD_NOTIFY DEFAULT_CONFIG_FILE=$(sysconfdir)/keepalived/./doc/samples/keepalived.conf.sample

System options:  VSYSLOG MEMFD_CREATE IPV6_MULTICAST_ALL IPV4_DEVCONF LIBNL3 RTA_ENCAP RTA_EXPIRES RTA_NEWDST RTA_PREF FRA_SUPPRESS_PREFIXLEN FRA_SUPPRESS_IFGROUP FRA_TUN_ID RTAX_CC_ALGO RTAX_QUICKACK RTEXT_FILTER_SKIP_STATS FRA_L3MDEV FRA_UID_RANGE RTAX_FASTOPEN_NO_COOKIE RTA_VIA FRA_PROTOCOL FRA_IP_PROTO FRA_SPORT_RANGE FRA_DPORT_RANGE RTA_TTL_PROPAGATE IFA_FLAGS LWTUNNEL_ENCAP_MPLS LWTUNNEL_ENCAP_ILA NET_LINUX_IF_H_COLLISION LIBIPVS_NETLINK IPVS_DEST_ATTR_ADDR_FAMILY IPVS_SYNCD_ATTRIBUTES IPVS_64BIT_STATS IPVS_TUN_TYPE IPVS_TUN_CSUM IPVS_TUN_GRE VRRP_IPVLAN IFLA_LINK_NETNSID GLOB_BRACE GLOB_ALTDIRFUNC INET6_ADDR_GEN_MODE VRF SO_MARK

Additional context
Here is the full path:

find ~/tmp/root/etc/keepalived/ -type f
/home/rohara/tmp/root/etc/keepalived/doc/samples/keepalived.conf.sample.sample

I think it should be:

/home/rohara/tmp/root/etc/keepalived/keepalived.conf

We could use something like 'basename' to strip the PATH, then the file should just be 'keepalived.conf'.

[pqarmitage]

If you specify --with-default-config-file=./doc/samples/keepalived.conf.sample with doc/samples as part of the path, then I would expect that doc/samples would appear somewhere in the path to the default config file.

--with-default-config-file specifies the default path that the keepalived executable will use to open its config file if no -f option is specified to keepalived when keepalived is executed. To be "helpful" keepalived installs a default config file to that path with .sample appended, to give the user a head start in creating a working configuration file.

I would be very happy to create another configure option to specify the source location for a config file to be copied to the default config file path (possibly with .sample appended [comments appreciated]) which would achieve what I think you are expecting to happen.