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How to avoid reinstalling packages when building Docker image for Python projects?
... a Dockerfile which looks something like this:
FROM my/base
WORKDIR /srv
ADD ./requirements.txt /srv/requirements.txt
RUN pip install -r requirements.txt
ADD . /srv
RUN python setup.py install
ENTRYPOINT ["run_server"]
Docker will use cache during pip install as long as you do not make any change...
Java 8: Lambda-Streams, Filter by Method with Exception
... being essential for lambda method chaining, so I hope one day it will be added to one of the popular libs or this propagating behavior would be by default.
public class PropagateExceptionsSample {
// a simplified version of Throwables#propagate
public static RuntimeException runtime(Throwa...
Can I split an already split hunk with git?
I've recently discovered git's patch option to the add command, and I must say it really is a fantastic feature.
I also discovered that a large hunk could be split into smaller hunks by hitting the s key, which adds to the precision of the commit.
But what if I want even more precision, if the...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...container. Others apparently have done it purely with system frameworks.
Adding OpenSSL to your project is not trivial. The RMStore wiki should help.
If you opt to use OpenSSL to open the PKCS7 container, your code could look like this. From RMAppReceipt:
+ (NSData*)dataFromPKCS7Path:(NSString*...
How do you fix a bad merge, and replay your good commits onto a fixed merge?
...ge
git checkout -b tmpfix <sha1-of-merge>
# remove the incorrectly added file
git rm somefile.orig
# commit the amended merge
git commit --amend
# go back to the master branch
git checkout master
# replant the master branch onto the corrected merge
git rebase tmpfix
# delete the temporary...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
... of such an action might be manipulation of the MMU to gain access to the address space of another process. Normally, user-mode code cannot do this (with good reason), although it can request shared memory from the kernel, which could be read or written by more than one process. In this case, the ...
What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
...y puny test cases, you are Stop at 0x0013f3: (106) Invalid instruction 0x00dd
printf crashes. "O_O"
gcc 4.4@x86_64-suse-linux
We like to think that:
..05 int has the size of pointers
but 'sizeof(int)==sizeof(void*)' is false.
..08 overshifting is okay
but '(1<<bits_per_int)==0' is false....
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...ly from gcc-4.6.4 -Os (executes in 0.709 secs):
00000000004004d2 <_ZL3addRKiS0_.isra.0>:
4004d2: 8d 04 37 lea eax,[rdi+rsi*1]
4004d5: c3 ret
00000000004004d6 <_ZL4workii>:
4004d6: 41 55 push r13
4004d8...
How using try catch for exception handling is best practice
..."custom message", innerException) to keep track of what really happened
Additionally, I try my best to sort exceptions correctly. There are exceptions which:
need to be shown to the user immediately
require some extra processing to put things together when they happen to avoid cascading problems...
In Java, what is the best way to determine the size of an object?
...ze(Object o) {
return instrumentation.getObjectSize(o);
}
}
Add the following to your MANIFEST.MF:
Premain-Class: ObjectSizeFetcher
Use getObjectSize:
public class C {
private int x;
private int y;
public static void main(String [] args) {
System.out.println(Ob...