[PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[Amadeusz Żołnowski]

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---
 dracut           |    2 +-
 dracut-functions |   47 ++++++++++++++++++++---------------------------
 2 files changed, 21 insertions(+), 28 deletions(-)

diff --git a/dracut b/dracut
index 139d0e0..3b1e7e8 100755
--- a/dracut
+++ b/dracut
@@ -184,7 +184,7 @@ abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 
 srcmods="/lib/modules/$kernel/"
 [[ $drivers_dir ]] && {
-    if verlt $(modprobe --version | cut -d' ' -f3) 3.7; then
+    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.5; then
         derror 'To use --kmoddir option module-init-tools >= 3.7 is required.'
         exit 1
     fi
diff --git a/dracut-functions b/dracut-functions
index 500e3ae..58f119f 100755
--- a/dracut-functions
+++ b/dracut-functions
@@ -24,38 +24,31 @@ IF_dynamic=""
 # Generic substring function.  If $2 is in $1, return 0.
 strstr() { [[ $1 =~ $2 ]]; }
 
-# Version comparision function.  Returns result similar to C strcmp,
-# but instead of -1 is 2.  Function assumes version scheme like does
-# Linux kernel.
-# $1 < $2 -> 2
-# $1 = $2 -> 0
-# $1 > $2 -> 1
-# To remember it easy, ask the question: Which argument is greater? ;-)
+# Version comparision function.  Assumes Linux style version scheme.
+# $1 = version a
+# $2 = comparision op (gt, ge, eq, le, lt, ne)
+# $3 = version b
 vercmp() {
-    local i n1=(${1//./ }) n2=(${2//./ })
+    local n1=(${1//./ }) op=$2 n2=(${3//./ }) i res
 
     for ((i=0; ; i++))
-    do 
-        [[ ${n1[i]} && ! ${n2[i]} ]] && return 1
-        [[ ! ${n1[i]} && ${n2[i]} ]] && return 2
-        [[ ${n1[i]} && ${n2[i]} ]] || return 0
-        ((${n1[i]} > ${n2[i]})) && return 1
-        ((${n1[i]} < ${n2[i]})) && return 2
+    do
+        if [[ ! ${n1[i]}${n2[i]} ]]; then res=0
+        elif ((${n1[i]:-0} > ${n2[i]:-0})); then res=1
+        elif ((${n1[i]:-0} < ${n2[i]:-0})); then res=2
+        else continue
+        fi
+        break
     done
-}
 
-# Variation of version comparision function.  If $1 >= $2, return 0.
-verge() {
-    vercmp $1 $2
-
-    [[ $? = 0 || $? = 1 ]]
-}
-
-# Variation of version comparision function.  If $1 < $2, return 0.
-verlt() {
-    vercmp $1 $2
-
-    [[ $? = 2 ]]
+    case $op in
+        gt) ((res == 1));;
+        ge) ((res != 2));;
+        eq) ((res == 0));;
+        le) ((res != 1));;
+        lt) ((res == 2));;
+        ne) ((res != 0));;
+    esac
 }
 
 # Log initrd creation.
-- 
1.7.1

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Re: [PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[Adam Spragg]

On Friday 11 Jun 2010 20:10:34 Amadeusz Żołnowski wrote:
> diff --git a/dracut b/dracut
> index 139d0e0..3b1e7e8 100755
> --- a/dracut
> +++ b/dracut
> @@ -184,7 +184,7 @@ abs_outfile=$(readlink -f "$outfile") &&
> outfile="$abs_outfile"
> 
>  srcmods="/lib/modules/$kernel/"
>  [[ $drivers_dir ]] && {
> -    if verlt $(modprobe --version | cut -d' ' -f3) 3.7; then
> +    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.5; then
>          derror 'To use --kmoddir option module-init-tools >= 3.7 is
> required.' exit 1
>      fi

Which version? 3.7? Or 3.5

Re: [PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[Amadeusz Żołnowski]

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Adam Spragg <adam-2iSS7ArDF14@public.gmane.org>:
> On Friday 11 Jun 2010 20:10:34 Amadeusz Żołnowski wrote:
> > diff --git a/dracut b/dracut
> > index 139d0e0..3b1e7e8 100755
> > --- a/dracut
> > +++ b/dracut
> > @@ -184,7 +184,7 @@ abs_outfile=$(readlink -f "$outfile") &&
> > outfile="$abs_outfile"
> > 
> >  srcmods="/lib/modules/$kernel/"
	> >  [[ $drivers_dir ]] && {
> > -    if verlt $(modprobe --version | cut -d' ' -f3) 3.7; then
> > +    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.5; then
> >          derror 'To use --kmoddir option module-init-tools >= 3.7 is
> > required.' exit 1
> >      fi
> 
> Which version? 3.7? Or 3.5

3.7. Thanks for being alert!


Cheers,
Amadeusz Żołnowski

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Re: [PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[Amadeusz Żołnowski]

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Left incorrect module-init-tools version in the patch, here's the fix:
---
 dracut |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dracut b/dracut
index 3b1e7e8..3be4989 100755
--- a/dracut
+++ b/dracut
@@ -184,7 +184,7 @@ abs_outfile=$(readlink -f "$outfile") && outfile="$abs_outfile"
 
 srcmods="/lib/modules/$kernel/"
 [[ $drivers_dir ]] && {
-    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.5; then
+    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.7; then
         derror 'To use --kmoddir option module-init-tools >= 3.7 is required.'
         exit 1
     fi
-- 
1.7.1

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Re: [PATCH] dracut, dracut-functions: better vercmp; credits go to V. Lowther

[Harald Hoyer]

On 06/11/2010 09:47 PM, Amadeusz Żołnowski wrote:
> Left incorrect module-init-tools version in the patch, here's the fix:
> ---
>   dracut |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/dracut b/dracut
> index 3b1e7e8..3be4989 100755
> --- a/dracut
> +++ b/dracut
> @@ -184,7 +184,7 @@ abs_outfile=$(readlink -f "$outfile")&&  outfile="$abs_outfile"
>
>   srcmods="/lib/modules/$kernel/"
>   [[ $drivers_dir ]]&&  {
> -    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.5; then
> +    if vercmp $(modprobe --version | cut -d' ' -f3) lt 3.7; then
>           derror 'To use --kmoddir option module-init-tools>= 3.7 is required.'
>           exit 1
>       fi

pushed