Watchman: Include easier instructions for installing Watchman on Ubuntu

[seenickcode]

Hello,

I am compiling from source to install on an Ubuntu 18.04 machine and found it a bit cumbersome to get the full list of required packages to build. Some required packages listed are a bit vague (i.e. "You may optionally build watchman without pcre and python support", it appears building fails if python-dev isn't installed)

Ex: this is what got everything to work on Ubuntu 18.04:

sudo apt-get install libtool pkg-config automake openssl-dev python-dev

Why not just include a easy to use command to just install all requirements?

[jurosh]

On Kubuntu 18.04
E: Unable to locate package openssl-dev

Tried to install libssl-dev instead.. but got another issue:

watchman-ContentHash.o: In function `watchman::ContentHashCache::computeHashImmediate(watchman::ContentHashCacheKey const&) const':
/watchman/ContentHash.cpp:65: undefined reference to `SHA1_Init'
/watchman/ContentHash.cpp:78: undefined reference to `SHA1_Update'
/watchman/ContentHash.cpp:81: undefined reference to `SHA1_Final'
collect2: error: ld returned 1 exit status
Makefile:1566: recipe for target 'watchman' failed
make[1]: *** [watchman] Error 1

Curious if there isn't like slower but NodeJS watcher with same API like Watchman :X

EDIT:

After I did again ./autogen.sh && ./configure... make worked! as described in https://github.com/facebook/watchman/issues/528

[yanneves]

Paraphrasing from above and #528, if you realise you need libssl-dev after you've already run ./autogen.sh and ./configure - you'll need a soft restart, run make clean and start again.

[mgedmin]

Ideally somebody would set up an Ubuntu PPA so people won't have to build this from scratch on every machine...

[yanneves]

For sure @mgedmin, I'd lend a hand if I had a clue how to - what's stopping you?

[simkusr]

On Kubuntu 18.04
E: Unable to locate package openssl-dev

Tried to install libssl-dev instead.. but got another issue:

watchman-ContentHash.o: In function `watchman::ContentHashCache::computeHashImmediate(watchman::ContentHashCacheKey const&) const':
/watchman/ContentHash.cpp:65: undefined reference to `SHA1_Init'
/watchman/ContentHash.cpp:78: undefined reference to `SHA1_Update'
/watchman/ContentHash.cpp:81: undefined reference to `SHA1_Final'
collect2: error: ld returned 1 exit status
Makefile:1566: recipe for target 'watchman' failed
make[1]: *** [watchman] Error 1

Curious if there isn't like slower but NodeJS watcher with same API like Watchman :X

EDIT:

After I did again ./autogen.sh && ./configure... make worked! as described in #528

Thank you, it worked for me!