Bug 515604

SUMMARY

I am working with an esoteric system where the `ldd` command is very slow, and on which it is therefore desirable to avoid use of the `ldd` command in any way that possible. Unfortunately, this code in Ark is causing Dolphin file browser to freeze for a long time while running on that system the first time that right click is used after opening Dolphin.

https://invent.kde.org/utilities/ark/-/blob/ad9d210081a6a8af0e600665bd50a5d5dc881c7a/kerfuffle/pluginmanager.cpp#L271

STEPS TO REPRODUCE

1.  Build and reinstall glibc with this patch which simulates the presence of the system that has the slow `ldd` command

```diff
--- a/elf/ldd.bash.in
+++ b/elf/ldd.bash.in
@@ -135,6 +135,7 @@ esac
 
 result=0
 for file do
+  sleep 10
   # We don't list the file name when there is only one.
   test $single_file = t || echo "${file}:"
   case $file in
```

Example code to do this on Arch Linux:

```
sudo pacman -Syyu
sudo pacman -S base-devel devtools
pkgctl repo clone --protocol=https glibc
cd glibc
git apply -v << 'EOF'
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -48,6 +48,8 @@ prepare() {
 
   [[ -d glibc-$pkgver ]] && ln -s glibc-$pkgver glibc
   cd glibc
+
+  patch -p1 < ../../ldd.patch
 }
 
 build() {
@@ -134,6 +136,7 @@ _skip_test() {
 }
 
 check() (
+  return 0
   cd glibc-build
 
   # adjust/remove buildflags that cause false-positive testsuite failures
diff --git a/ldd.patch b/ldd.patch
new file mode 100644
index 0000000..c477e67
--- /dev/null
+++ b/ldd.patch
@@ -0,0 +1,12 @@
+diff --git a/elf/ldd.bash.in b/elf/ldd.bash.in
+index 2d3df6e57e..d8c7f337ba 100644
+--- a/elf/ldd.bash.in
++++ b/elf/ldd.bash.in
+@@ -135,6 +135,7 @@ esac
+ 
+ result=0
+ for file do
++  sleep 10
+   # We don't list the file name when there is only one.
+   test $single_file = t || echo "${file}:"
+   case $file in
EOF
makepkg -sifC
```

2. Install both Ark and Dolphin, 

```bash
sudo pacman -S ark dolphin
```

3. Close app running instances of Dolphin, then open Dolphin again and right click

```bash
pkill dolphin
dolphin
```

OBSERVED RESULT

Dolphin freezes and does not respond for more than 10 seconds


EXPECTED RESULT

The presence or absence of LZO support in `libarchive` should be calculated some other way that does not involve the use of the `ldd` command, preferably at build-time rather than run-time if possible.


SOFTWARE/OS VERSIONS

Windows: Not tested
macOS: Not tested
Linux: Arch Linux
KDE Plasma Version: 6.5.5
KDE Frameworks Version:  6.22.0
Qt Version: 6.10.2
`ldd` version: ldd (GNU libc) 2.42 (modified, crafted behavior)
Graphics Platform: Wayland
Dolphin version: 25.12.2
Ark version: 25.12.2

ADDITIONAL INFORMATION

Esoteric system that has a slow `ldd` command is Android, specifically the Termux App package of `ldd` for Android