Re: [PR PATCH] [Updated] common/hooks: speed up generate-runtime-deps.

[ericonr <ericonr@users.noreply.github.com>]

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There is an updated pull request by ericonr against master on the void-packages repository

https://github.com/ericonr/void-packages speedelf
https://github.com/void-linux/void-packages/pull/31364

common/hooks: speed up generate-runtime-deps.
Instead of using file(1) to check for ELF files, just read bytes
directly from the file and check if they are the ELF magic bytes.

Should probably be factored out into a common function that can be used
in other places.

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- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
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A patch file from https://github.com/void-linux/void-packages/pull/31364.patch is attached

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From d7a69d7aff05e6d22369f249d2f566d146e459e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89rico=20Nogueira?= <erico.erc@gmail.com>
Date: Tue, 8 Jun 2021 11:43:00 -0300
Subject: [PATCH] common/hooks: speed up generate-runtime-deps.

Instead of using file(1) to check for ELF files, just read bytes
directly from the file and check if they are the ELF magic bytes.

Should probably be factored out into a common function that can be used
in other places, if necessary.

Also use awk instead of "grep|awk" for some minor speedup.
---
 .../hooks/pre-pkg/04-generate-runtime-deps.sh | 23 +++++++++----------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/common/hooks/pre-pkg/04-generate-runtime-deps.sh b/common/hooks/pre-pkg/04-generate-runtime-deps.sh
index 8ffd3a71d8eb..c8f8c04d4884 100644
--- a/common/hooks/pre-pkg/04-generate-runtime-deps.sh
+++ b/common/hooks/pre-pkg/04-generate-runtime-deps.sh
@@ -47,7 +47,7 @@ store_pkgdestdir_rundeps() {
 }
 
 hook() {
-    local depsftmp f lf j mapshlibs sorequires _curdep
+    local depsftmp f lf j mapshlibs sorequires _curdep elfmagic
 
     # Disable trap on ERR, xbps-uhelper cmd might return error... but not something
     # to be worried about because if there are broken shlibs this hook returns
@@ -72,18 +72,17 @@ hook() {
 		    msg_normal "Skipping dependency scan for ${lf}\n"
 		    continue
 	    fi
-        case "$(file -bi "$f")" in
-            application/x-*executable*|application/x-sharedlib*)
-                for nlib in $($OBJDUMP -p "$f"|grep NEEDED|awk '{print $2}'); do
-                    [ -z "$verify_deps" ] && verify_deps="$nlib" && continue
-                    found=0
-                    for j in ${verify_deps}; do
-                        [[ $j == $nlib ]] && found=1 && break
-                    done
-                    [[ $found -eq 0 ]] && verify_deps="$verify_deps $nlib"
+        read -n4 elfmagic < "$f"
+        if [ "$elfmagic" = $'\177ELF' ]; then
+            for nlib in $($OBJDUMP -p "$f"|awk '/NEEDED/{print $2}'); do
+                [ -z "$verify_deps" ] && verify_deps="$nlib" && continue
+                found=0
+                for j in ${verify_deps}; do
+                    [[ $j == $nlib ]] && found=1 && break
                 done
-                ;;
-        esac
+                [[ $found -eq 0 ]] && verify_deps="$verify_deps $nlib"
+            done
+        fi
     done
     exec 0<&3 # restore stdin
     rm -f $depsftmp