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Tue, 16 Jun 2026 14:13:48 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/238903 --------------PqOdGzJYEfztAmmFp2bvRQIk Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Richard, On 6/16/26 15:44, Richard Purdie wrote: > On Tue, 2026-06-16 at 15:35 +0200, Anders Heimer via lists.openembedded.org wrote: >> On 6/16/26 14:12, Paul Barker wrote: >>> On Tue, 2026-06-16 at 10:25 +0200, Anders Heimer wrote: >>>> -        for pmap in prefixmap: >>>> +        env = os.environ.copy() >>>> +        env["LC_ALL"] = "C" >>>> + >>>> +        for pmap, prefix in prefixmap.items(): >>>> +            dstroot = dvar + prefix >>>>               # Ignore files from the recipe sysroots (target and native) >>>> -            cmd =  "LC_ALL=C ; sort -z -u '%s' | egrep -v -z '((|)$|/.*recipe-sysroot.*/)' | " % sourcefile >>>> +            sort_p = subprocess.Popen(["sort", "-z", "-u", "--", sourcefile], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env) >>>> +            egrep_p = subprocess.Popen(["egrep", "-v", "-z", "-e", r"((|)$|/.*recipe-sysroot.*/)"], stdin=sort_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env) >>>> +            sort_p.stdout.close() >>>> + >>>>               # We need to ignore files that are not actually ours >>>>               # we do this by only paying attention to items from this package >>>> -            cmd += "fgrep -zw '%s' | " % prefixmap[pmap] >>>> +            fgrep_p = subprocess.Popen(["fgrep", "-zw", "-e", prefix], stdin=egrep_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env) >>>> +            egrep_p.stdout.close() >>>> + >>>>               # Remove prefix in the source paths >>>> -            cmd += "sed 's#%s/##g' | " % (prefixmap[pmap]) >>>> -            cmd += "(cd '%s' ; cpio -pd0mlLu --no-preserve-owner '%s%s' 2>/dev/null)" % (pmap, dvar, prefixmap[pmap]) >>>> +            sed_p = subprocess.Popen(["sed", "s#%s/##g" % prefix], stdin=fgrep_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env) >>>> +            fgrep_p.stdout.close() >>>> + >>>> +            cpio_p = subprocess.Popen(["cpio", "-pd0mlLu", "--no-preserve-owner", dstroot], stdin=sed_p.stdout, cwd=pmap, stderr=subprocess.DEVNULL, env=env) >>>> +            sed_p.stdout.close() >>>> + >>>> +            for proc in (cpio_p, sed_p, fgrep_p, egrep_p, sort_p): >>>> +                proc.wait() >>> Hi Anders, thanks for the patches! >>> >>> If we're reworking this code, I think we should replace the complex >>> sed/grep/sort pipeline with Python code. We can read into a Python list >>> and sort/filter using the Python standard library, then pass the results >>> to cpio. >> Thank you,  I am very happy to implement this approach instead. I >> strongly agree with all your comments. > There are some other things to consider here. This is a fairly > sensitive area of code from a performance perspective. You could code > much of this in python using shutil for example however shutil has > traditionally been up to an order of magnitude slower. As such, this > code was optimized to be fast, hence the use of cpio. > > In many cases I worry less about performance but this is one area it > does really matter and makes a big difference to build speed overall. > python can be fast if carefully written but if this used shutil for > example, it likely won't be. > > Cheers, > > Richard Good point. I will avoid replacing the copy step with shutil and keep cpio in the path. I can look at whether only the sort/filter part can move to Python while still feeding cpio. I had not considered the performance sensitivity here, so I will run some benchmarking before proposing any larger change. Best regards, Anders --------------PqOdGzJYEfztAmmFp2bvRQIk Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi Richard,

On 6/16/26 15:44, Richard Purdie wrote:
On Tue, 2026-06-16 at 15:35 +0200, Anders Heimer via lists.openembedded.org wrote:

On 6/16/26 14:12, Paul Barker wrote:

On Tue, 2026-06-16 at 10:25 +0200, Anders Heimer wrote:

-        for pmap in prefixmap:
+        env = os.environ.copy()
+        env["LC_ALL"] = "C"
+
+        for pmap, prefix in prefixmap.items():
+            dstroot = dvar + prefix
              # Ignore files from the recipe sysroots (target and native)
-            cmd =  "LC_ALL=C ; sort -z -u '%s' | egrep -v -z '((<internal>|<built-in>)$|/.*recipe-sysroot.*/)' | " % sourcefile
+            sort_p = subprocess.Popen(["sort", "-z", "-u", "--", sourcefile], stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env)
+            egrep_p = subprocess.Popen(["egrep", "-v", "-z", "-e", r"((<internal>|<built-in>)$|/.*recipe-sysroot.*/)"], stdin=sort_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env)
+            sort_p.stdout.close()
+
              # We need to ignore files that are not actually ours
              # we do this by only paying attention to items from this package
-            cmd += "fgrep -zw '%s' | " % prefixmap[pmap]
+            fgrep_p = subprocess.Popen(["fgrep", "-zw", "-e", prefix], stdin=egrep_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env)
+            egrep_p.stdout.close()
+
              # Remove prefix in the source paths
-            cmd += "sed 's#%s/##g' | " % (prefixmap[pmap])
-            cmd += "(cd '%s' ; cpio -pd0mlLu --no-preserve-owner '%s%s' 2>/dev/null)" % (pmap, dvar, prefixmap[pmap])
+            sed_p = subprocess.Popen(["sed", "s#%s/##g" % prefix], stdin=fgrep_p.stdout, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, env=env)
+            fgrep_p.stdout.close()
+
+            cpio_p = subprocess.Popen(["cpio", "-pd0mlLu", "--no-preserve-owner", dstroot], stdin=sed_p.stdout, cwd=pmap, stderr=subprocess.DEVNULL, env=env)
+            sed_p.stdout.close()
+
+            for proc in (cpio_p, sed_p, fgrep_p, egrep_p, sort_p):
+                proc.wait()

Hi Anders, thanks for the patches!

If we're reworking this code, I think we should replace the complex
sed/grep/sort pipeline with Python code. We can read into a Python list
and sort/filter using the Python standard library, then pass the results
to cpio.

Thank you,  I am very happy to implement this approach instead. I 
strongly agree with all your comments.

There are some other things to consider here. This is a fairly
sensitive area of code from a performance perspective. You could code
much of this in python using shutil for example however shutil has
traditionally been up to an order of magnitude slower. As such, this
code was optimized to be fast, hence the use of cpio.

In many cases I worry less about performance but this is one area it
does really matter and makes a big difference to build speed overall.
python can be fast if carefully written but if this used shutil for
example, it likely won't be.

Cheers,

Richard
Good point. I will avoid replacing the copy step with shutil and keep cpio in the path. I can look at whether only the sort/filter part can move to Python while still feeding cpio.

I had not considered the performance sensitivity here, so I will run some benchmarking before proposing any larger change.

Best regards,
Anders


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