chg: make is possible to call by default an hg binary located next to chg When a single version of hg is in use and it's in the PATH, using chg is just a matter of calling chg. But when there are multiple installations of hg+chg around, and hg is referred to with an absolute path, using chg is more annoying because it requires both changing the invocation to hg to use chg, but also setting CHGHG. Currently, we set HGPATH when we build chg to remove the need to set CHGHG in the previous paragraph. But that means chg now hardcodes its installation path, which makes the installation not relocatable. Hence this proposal to make chg find ./hg relative to itself (as opposed to CHGHG=./hg which find hg relative to cwd). This only works on linux as written, but since it's opt-in, it sounds fine. Tested by hand, as I'm not sure how else to test this. Differential Revision: https://phab.mercurial-scm.org/D9006

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cHg

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===

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A fast client for Mercurial command server running on Unix.

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Install:

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 $ make

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 $ make install

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Usage:

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 $ chg help                 # show help of Mercurial

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 $ alias hg=chg             # replace hg command

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 $ chg --kill-chg-daemon    # terminate background server

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Environment variables:

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Although cHg tries to update environment variables, some of them cannot be

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changed after spawning the server. The following variables are specially

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handled:

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 * configuration files are reloaded automatically by default.

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 * CHGHG or HG specifies the path to the hg executable spawned as the

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   background command server.

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The following variables are available for testing:

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 * CHGDEBUG enables debug messages.

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 * CHGSOCKNAME specifies the socket path of the background cmdserver.

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 * CHGTIMEOUT specifies how many seconds chg will wait before giving up

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   connecting to a cmdserver. If it is 0, chg will wait forever. Default: 60

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Build environment variables:

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 * HGPATH: the path to the hg executable to call when CHGHG and HG are not set,

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   instead of "hg"

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 * HGPATHREL=1: when CHGHG and HG are not set, the hg executable will be ./hg

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   relative to the chg executable. Only works on linux, falls back to "hg"

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   otherwise.