d1662d7155
The use case is to do a deep replacement of a dependency without rebuilding the entire tree.
For example, suppose a security hole is found in glibc and a patch released. Ideally, you'd
just rebuild everything, but that takes time, space, and CPU that you might not have, so in
the mean time you could build a safe version of, say, firefox with:
firefox-safe = replace-dependency { drv = firefox; old-dependency = glibc; new-dependency = patched-glibc; };
Building firefox-safe will rebuild glibc, but only do a simple copy/string replacement on all other dependencies
of firefox. On my system (MBP 13" mid-2012), after a new glibc had been build building firefox took around 11 seconds.
See the comments in the file for more details.
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| .. | ||
| buildenv | ||
| builder-defs | ||
| cabal | ||
| checker | ||
| clang-wrapper | ||
| dotnetenv | ||
| fetchbzr | ||
| fetchcvs | ||
| fetchdarcs | ||
| fetchfile | ||
| fetchgit | ||
| fetchgitrevision | ||
| fetchhg | ||
| fetchmtn | ||
| fetchsvn | ||
| fetchsvnrevision | ||
| fetchsvnssh | ||
| fetchurl | ||
| gcc-cross-wrapper | ||
| gcc-upc-wrapper | ||
| gcc-wrapper | ||
| kernel | ||
| make-desktopitem | ||
| make-startupitem | ||
| make-symlinks | ||
| mono-dll-fixer | ||
| native-darwin-cctools-wrapper | ||
| nuke-references | ||
| release | ||
| setup-hooks | ||
| src-only | ||
| substitute | ||
| upstream-updater | ||
| vm | ||
| vsenv | ||
| replace-dependency.nix | ||
| source-from-head-fun.nix | ||
| trivial-builders.nix | ||