fix(url-lib.sh): nfs_already_mounted() with trailing slash in nfs path

nfs_already_mounted() doesn't work when the installation ISO and kickstart file on a same NFS share are specified with inst.repo and inst.ks boot parameter as below.

   inst.repo=nfs:192.168.1.1:/home/data/rhel9.iso inst.ks=nfs:192.168.1.1:/home/data/ks.cfg

   NOTE: /home/data is configured for nfs share on 192.168.1.1

One problem is a file (not a directory) was passed into nfs_already_mounted().
nfs_already_mounted() is the function to judge if the given directory is already mounted.
So, filepath should be passed in nfs_fetch_url().

The other problem is about the trailing slash in the nfs path in /proc/mounts.

The /proc/mounts has an entry after nfs mount of inst.repo.

   192.168.1.1:/data/   /run/install/isodir  nfs  ro,relatime,<snip>

In this case, nfs_already_mounted() returns "/run/install/isodir//home/data/ks.cfg" wrongly. The following is from the log.

[   14.556279] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@156(nfs_fetch_url): nfs_already_mounted 192.168.122.1 /home/data/ks.cfg
[   14.556279] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@137(nfs_already_mounted): local server=192.168.122.1 path=/home/data/ks.cfg s= p=
...
[   14.654966] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@140(nfs_already_mounted): '[' 192.168.122.1 = 192.168.122.1 ']'
[   14.654966] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@141(nfs_already_mounted): '[' /home/data/ks.cfg = /home/data/ ']'
[   14.654966] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@143(nfs_already_mounted): str_starts /home/data/ks.cfg /home/data/
[   14.654966] localhost.localdomain dracut-initqueue[1282]: ///lib/dracut-lib.sh@51(str_starts): '[' ks.cfg '!=' /home/data/ks.cfg ']'
[   14.654966] localhost.localdomain dracut-initqueue[1282]: ///lib/url-lib.sh@144(nfs_already_mounted): echo /run/install/isodir//home/data/ks.cfg
...
[   14.658069] localhost.localdomain dracut-initqueue[934]: //lib/url-lib.sh@156(nfs_fetch_url): mntdir=/run/install/isodir//home/data/ks.cfg

This function doesn't expect the trailiing slash of the nfs path in /proc/mounts, so it should be removed before processing it.

modules.d/45url-lib/url-lib.sh

@@ -137,6 +137,7 @@ nfs_already_mounted() {
     local server="$1" path="$2" s="" p=""
     while read -r src mnt rest || [ -n "$src" ]; do
         splitsep ":" "$src" s p
+        p=${p%/}
         if [ "$server" = "$s" ]; then
             if [ "$path" = "$p" ]; then
                 echo "$mnt"
@@ -153,7 +154,7 @@ nfs_fetch_url() {
     local filepath="${path%/*}" filename="${path##*/}" mntdir=""
 
     # skip mount if server:/filepath is already mounted
-    mntdir=$(nfs_already_mounted "$server" "$path")
+    mntdir=$(nfs_already_mounted "$server" "$filepath")
     if [ -z "$mntdir" ]; then
         local mntdir
         mntdir="$(mkuniqdir /run nfs_mnt)"