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New APIs: set-tmpdir, get-tmpdir, set-cachedir, get-cachedir.
The current code has evolved over time and has a number of problems:
(a) A single environment variable ($TMPDIR) controls the
location of several directories.
(b) It's hard for the library user to predict which directory
libguestfs will use, unless the user simulates the same internal steps
that libguestfs performs.
This commit fixes these issues.
(a) Now three environment variables control the location of all small
temporary files, and the appliance cache:
For temporary files: $LIBGUESTFS_TMPDIR or $TMPDIR or /tmp.
For the appliance cache: $LIBGUESTFS_CACHEDIR or $TMPDIR or /var/tmp.
The user can also set these directories explicitly through API calls
(guestfs_set_tmpdir and guestfs_set_cachedir).
(b) The user can also retrieve the actual directories that libguestfs
will use, by calling guestfs_get_tmpdir and guestfs_get_cachedir.
These functions are also used internally.
This commit also:
- reworks the internal tmpdir code
- removes the internal (undocumented) guestfs_tmpdir call (replacing
it with calls to the documented guestfs_get_tmpdir API instead)
- changes the ./run script to set LIBGUESTFS_TMPDIR and
LIBGUESTFS_CACHEDIR
- adds a test
- fixes a few places like libguestfs-make-fixed-appliance which
depended on $TMPDIR
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<file>: error: jump skips variable initialization [-Werror=jump-misses-init]
This has only just appeared, possibly related to previous gnulib
update. In any case, this is just code motion / cleanup.
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This function does 'rm -rf <dir>' for temporary directories, safely
working if '<dir>' contains shell meta-characters.
Replace existing code for removing directories with this.
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This library is widely available in distros.
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This change makes these libraries optional. If they are not
available at compile time then certain core API features will
be disabled (see below).
This also changes PCRE detection to use pkg-config instead
of the ad hoc autoconf checks.
The large inspect.c file has been split out into separate
function-specific files.
file-architecture: requires pcre & libmagic
inspection: requires pcre & hivex
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